Sample records for ba ra zr

  1. Proton diffusion pathways and rates in Y-doped BaZrO3 solid oxide electrolyte from quantum mechanics

    E-Print Network [OSTI]

    Goddard III, William A.

    Proton diffusion pathways and rates in Y-doped BaZrO3 solid oxide electrolyte from quantum barriers for intraoctahedral and interoctahedral proton transfers. We find activation energy Ea values of 0.48 and 0.49 eV for the intraoctahedral proton transfers on O­O edges 2.58 and 2.59 Å of ZrO6 and YO6

  2. Strong blue and white photoluminescence emission of BaZrO{sub 3} undoped and lanthanide doped phosphor for light emitting diodes application

    SciTech Connect (OSTI)

    Romero, V.H. [Centro de Investigaciones en Optica, A. P. 1-948, Leon Gto., 37160 (Mexico)] [Centro de Investigaciones en Optica, A. P. 1-948, Leon Gto., 37160 (Mexico); De la Rosa, E., E-mail: elder@cio.mx [Centro de Investigaciones en Optica, A. P. 1-948, Leon Gto., 37160 (Mexico); Salas, P. [Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, A.P. 1-1010, Queretaro, Qro. 76000 (Mexico)] [Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, A.P. 1-1010, Queretaro, Qro. 76000 (Mexico); Velazquez-Salazar, J.J. [Department of Physics and Astronomy, The University of Texas at San Antonio One UTSA Circle, San Antonio TX 78249 (United States)] [Department of Physics and Astronomy, The University of Texas at San Antonio One UTSA Circle, San Antonio TX 78249 (United States)

    2012-12-15T23:59:59.000Z

    In this paper, we report the obtained strong broadband blue photoluminescence (PL) emission centered at 427 nm for undoped BaZrO{sub 3} observed after 266 nm excitation of submicron crystals prepared by hydrothermal/calcinations method. This emission is enhanced with the introduction of Tm{sup 3+} ions and is stronger than the characteristic PL blue emission of such lanthanide. The proposed mechanism of relaxation for host lattice emission is based on the presence of oxygen vacancies produced during the synthesis process and the charge compensation due to the difference in the electron valence between dopant and substituted ion in the host. Brilliant white light emission with a color coordinate of (x=0.29, y=0.32) was observed by combining the blue PL emission from the host with the green and red PL emission from Tb{sup 3+} and Eu{sup 3+} ions, respectively. The color coordinate can be tuned by changing the ratio between blue, green and red band by changing the concentration of lanthanides. - Graphical abstract: Strong blue emission from undoped BaZrO{sub 3} phosphor and white light emission by doping with Tb{sup 3+} (green) and Eu{sup 3+} (red) after 266 nm excitation. Highlights: Black-Right-Pointing-Pointer Blue emission from BaZrO{sub 3} phosphor. Black-Right-Pointing-Pointer Blue emission enhanced with Tm{sup 3+}. Black-Right-Pointing-Pointer White light from BaZrO{sup 3+} phosphor.

  3. Cation ordering transformations in Ba(Mg{sub 1/3}Ta{sub 2/3})O{sub 3}-BaZrO{sub 3} perovskite solid solutions

    SciTech Connect (OSTI)

    Chai, L.; Akbas, M.A.; Davies, P.K. [Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering] [Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering; Parise, J.B. [Univ. of New York, Stony Brook, NY (United States). Dept. of Earth and Space Sciences] [Univ. of New York, Stony Brook, NY (United States). Dept. of Earth and Space Sciences

    1997-09-01T23:59:59.000Z

    The effect of the substitution of BaZrO{sub 3} on the cation ordering in Ba(Mg{sub 1/3}Ta{sub 2/3})O{sub 3} was studied using TEM and X-ray and neutron diffraction. Almost no solubility of Zr was found in the 1:2 ordered, trigonal structure of the Ba(Mg{sub 1/3}Ta{sub 2/3})O{sub 3} end-member (P{bar 3}m1), and a transformation to a 1:1 ordered, cubic (Fm{bar 3}m) phase with a = 2a{sub per} occurs for substitution levels between {approximately}10 and 25 mol% BaZrO{sub 3}. The structure of this Ba({beta}{prime}{sub 1/2}{beta}{double_prime}{sub 1/2})O{sub 3}-type phase consists of two distinct octahedral sites, {beta}{prime} and {beta}{double_prime}. The occupancies of the two cation positions, refined using the Rietveld method, were found to be consistent with a random site model in which {beta}{double_prime} is occupied by Ta, and {beta}{prime} by a random distribution of the remaining cations. The homogeneity range of the 1:1 solid solutions predicted by this model, Ba{l_brace}[Mg{sub (2{minus}y)/3} Ta{sub (1{minus}2y)/3} Zr{sub y}]{sub 1/2}[Ta]{sub 1/2}{r_brace}O{sub 3} (0.0 < y {le} 0.5), is in excellent agreement with that observed experimentally.

  4. Characterization of the reaction products that develop in the processing of Al{sub 2}O{sub 3}/BaZrO{sub 3} laminated composites

    SciTech Connect (OSTI)

    Gladysz, G.M. [Youngstown State Univ., OH (United States). Dept. of Chemical Engineering] [Youngstown State Univ., OH (United States). Dept. of Chemical Engineering; Schmuecker, M.; Schneider, H. [German Aerospace Establishment, Cologne (Germany)] [German Aerospace Establishment, Cologne (Germany); Chawla, K.K. [Univ. of Alabama, Birmingham, AL (United States). Dept. of Materials and Mechanical Engineering] [Univ. of Alabama, Birmingham, AL (United States). Dept. of Materials and Mechanical Engineering; Joslin, D.L.; Ferber, M.K. [Oak Ridge National Lab., TN (United States)] [Oak Ridge National Lab., TN (United States)

    1998-04-01T23:59:59.000Z

    The absence of a chemical reaction at an interface is conventionally thought to be an important criterion in producing a tough ceramic matrix composite (CMC). As a result of this criterion, interphases in CMCs were chosen on the basis of their chemical reactivity. A weak interface results in crack deflection, crack bridging, and, in fiber-reinforced ceramics, fiber pullout, resulting in an increased fracture toughness. In this paper, the authors present microstructural observations on alumina (Al{sub 2}O{sub 3})-barium zirconate (BaZrO{sub 3}) laminated composites wherein the reaction products that develop during processing resulted in sharp interfaces and appear to be weak enough to deflect cracks. These in situ reaction products in Al{sub 2}O{sub 3}-BaZrO{sub 3} laminated composites were characterized with the use of a scanning electron microscope, an electron microprobe, and a transmission electron microscope. The phases that develop, ZrO{sub 2}, BaO{center_dot}Al{sub 2}O{sub 3}, and BaO{center_dot}6 Al{sub 2}O{sub 3}, produced sharp interfaces and are arranged in a sequence that could be predicted by using information from the phase diagram.

  5. Ion beam-assisted pulsed laser deposition of (Ba,Sr)(Ti,Zr)O{sub 3} films on Pt-Si substrates

    SciTech Connect (OSTI)

    Sakai, Joe; Vayunandana Reddy, Y. K.; Autret-Lambert, Cecile; Lagrange, Jean-Francois; Motret, Olivier; Roger, Sylvain; Wolfman, Jerome [Laboratoire LEMA, UMR 6157 CNRS-CEA, Universite Francois Rabelais de Tours, Parc de Grandmont, 37200 Tours (France)

    2011-05-15T23:59:59.000Z

    Ion beam-assisted pulsed laser deposition with an Ar-oxygen ion mixture was used to prepare Ba{sub 0.6}Sr{sub 0.4}Ti{sub 0.7}Zr{sub 0.3}O{sub 3} (BSTZ) thin films on Pt-coated Si substrates. The ion beam with an anode voltage of 600 V was effective to reduce the thermal budget, i.e., to achieve similar crystallinity with approximately 100 deg. C lower deposition temperature compared to the cases without ionization. It was revealed that the dielectric properties (relative dielectric constant {epsilon}{sub r} and its electric field tunability), out-of-plane lattice parameter of (001)-oriented grains (a{sub 001}), and the existence of (110)-oriented grains are correlated with one another. Elongation of a{sub 001} was suppressed, resulting in large {epsilon}{sub r} values comparable with that of a ceramic bulk of the same composition, in the BSTZ films that contain (110)-oriented grains. Less volume of amorphous BSTZ region is supposed to be playing an important role for the bulklike properties of these BSTZ films.

  6. Analysis of Beta-Decay Rates for Ag108, Ba133, Eu152, Eu154, Kr85, Ra226 And Sr90, Measured at the Physikalisch-Technische Bundesanstalt from 1990 to 1996

    E-Print Network [OSTI]

    Peter A. Sturrock; Ephraim Fischbach; Jere Jenkins

    2014-10-10T23:59:59.000Z

    We present the results of an analysis of measurements of the beta-decay rates of Ag108, Ba133, Eu152, Eu154, Kr85, Ra226, and Sr90 acquired at the Physikalisch-Technische Bundesanstalt from 1990 through 1995. Although the decay rates vary over a range of 165 to 1 and the measured detector current varies over a range of 19 to 1, the detrended and normalized current measurements exhibit a sinusoidal annual variation with amplitude in the small range 0.068% to 0.088% (mean 0.081%, standard deviation 0.0072%, an 11{\\sigma} rejection of the zero-amplitude hypothesis) and phase-of-maximum in the small range 0.062 to 0.083 (January 23 to January 30). In comparing these results with those of other related experiments that yield different results, it may be significant that this experiment, at a standards laboratory, seems to be unique in using a 4{\\pi} detector. These results are compatible with a solar influence, and appear not to be compatible with an experimental or environmental influence. It is possible that Ba133 measurements are subject also to a non-solar (possibly cosmic) influence.

  7. Microstructural and dielectric properties of Ba{sub 0.6}Sr{sub 0.4}Ti{sub 1-x}Zr{sub x}O{sub 3} based combinatorial thin film capacitors library

    SciTech Connect (OSTI)

    Liu Guozhen; Wolfman, Jerome; Autret-Lambert, Cecile; Sakai, Joe; Roger, Sylvain; Gervais, Monique; Gervais, Francois [Laboratoire d'Electrodynamique des Materiaux Avances (LEMA), UMR 6157 CNRS/CEA, Universite Francois Rabelais, Parc de Grandmont, 37200 Tours (France)

    2010-12-01T23:59:59.000Z

    Epitaxial growth of Ba{sub 0.6}Sr{sub 0.4}Ti{sub 1-x}Zr{sub x}O{sub 3} (0{<=}x{<=}0.3) composition spread thin film library on SrRuO{sub 3}/SrTiO{sub 3} layer by combinatorial pulsed laser deposition (PLD) is reported. X-ray diffraction and energy dispersive x-ray spectroscopy studies showed an accurate control of the film phase and composition by combinatorial PLD. A complex evolution of the microstructure and morphology with composition of the library is described, resulting from the interplay between epitaxial stress, increased chemical pressure, and reduced elastic energy upon Zr doping. Statistical and temperature-related capacitive measurements across the library showed unexpected variations in the dielectric properties. Doping windows with enhanced permittivity and tunability are identified, and correlated to microstructural properties.

  8. Order parameter and scaling behavior in BaZr{sub x}Ti{sub 1?x}O{sub 3} (0.3 < x < 0.6) relaxor ferroelectrics

    SciTech Connect (OSTI)

    Usman, Muhammad; Mumtaz, Arif, E-mail: arif@qau.edu.pk; Raoof, Sobia; Hasanain, S. K. [Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)] [Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)

    2013-12-23T23:59:59.000Z

    We report the relaxor behavior of the zirconium doped barium titanate BaZr{sub x}Ti{sub 1?x}O{sub 3} solid solutions and discuss the temperature, frequency, and concentration dependence in terms of correlations among the polar nanoregions. The relaxor behavior is analyzed within the mean field theory by estimating the Edward-Anderson order parameter q{sub EA}. Additionally, we find that q{sub EA} calculated for the different concentrations obeys a scaling behavior q{sub EA}=1?(T/T{sub m}){sup n}, where T{sub m} are the respective dielectric maxima temperatures and n?=?2.0?±?0.1. The frequency dependence of the q{sub EA} also shows results consistent with the above mentioned picture.

  9. A comparative study of SrO and BaO doping to CeO{sub 2}-ZrO{sub 2}: Characteristic and its catalytic performance for three-way catalysts

    SciTech Connect (OSTI)

    Guo, Jiaxiu, E-mail: guojiaxiu@scu.edu.cn [College of Architecture and Environment, Sichuan University, Chengdu 610065 (China) [College of Architecture and Environment, Sichuan University, Chengdu 610065 (China); National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065 (China); Shi, Zhonghua, E-mail: shizhonghua@scu.edu.cn [College of Chemistry, Sichuan University, Chengdu 610064 (China)] [College of Chemistry, Sichuan University, Chengdu 610064 (China); Wu, Dongdong [College of Chemistry, Sichuan University, Chengdu 610064 (China)] [College of Chemistry, Sichuan University, Chengdu 610064 (China); Yin, Huaqiang [College of Architecture and Environment, Sichuan University, Chengdu 610065 (China) [College of Architecture and Environment, Sichuan University, Chengdu 610065 (China); National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065 (China); Gong, Maochu [College of Chemistry, Sichuan University, Chengdu 610064 (China)] [College of Chemistry, Sichuan University, Chengdu 610064 (China); Chen, Yaoqiang [College of Chemistry, Sichuan University, Chengdu 610064 (China) [College of Chemistry, Sichuan University, Chengdu 610064 (China); National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065 (China)

    2013-02-15T23:59:59.000Z

    Graphical abstract: Display Omitted Highlights: ? The prepared materials have a face-centered cubic structure and nanosize particles. ?Comparing to CZB, aged CZS has 494 ?mol/g of OSC and 30 m{sup 2}/g of surface area. ? CZS and CZB have similar NO sorption and reductive properties and different H{sub 2} uptake. ? T{sub 50} of Pt-Rh/CZS/LA is as low as 199 °C for CO, 228 °C for NO, and 252 °C for C{sub 3}H{sub 8}. ? Pt-Rh/CZS/LA has wider working-window at 320 °C under different ? value. -- Abstract: Ceria-zirconia-strontia (Ce{sub 0.35}Zr{sub 0.55}Sr{sub 0.10}O{sub 1.9}) and ceria-zirconia-baria (Ce{sub 0.35}Zr{sub 0.55}Ba{sub 0.10}O{sub 1.9}) were synthesized using an oxidation-co-precipitation method with hydrogen peroxide (H{sub 2}O{sub 2}) as oxidant. The physical and chemical properties of the prepared materials were investigated using Brunauer–Emmett–Teller surface area characterization, transmission electron microscopy, X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy, and oxygen pulse reaction. The prepared materials were used in preparing three-way catalysts with low Pt and Rh content. Moreover, catalytic activities were evaluated at a fixed bed under a simulated gaseous mixture. The results are as follows: (1) the prepared materials have a face-centered cubic structure and are nano-sized; (2) aged Ce{sub 0.35}Zr{sub 0.55}Sr{sub 0.10}O{sub 1.9} has higher oxygen storage capacity (494 ?mol/g), better thermal stability (30 m{sup 2}/g), good low-temperature reducibility, and high hydrogen uptake after TPR-redox cycles; (3) the light-off temperature (T{sub 50}) of Pt-Rh/CZS/LA can be as low as 199 °C for CO, 228 °C for NO, and 252 °C for C{sub 3}H{sub 8}; and (4) Pt-Rh/CZS/LA has a fairly wide working-window.

  10. Symmetry determination on Pb-free piezoceramic 0.5Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-0.5(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} using convergent beam electron diffraction method

    SciTech Connect (OSTI)

    Gao, Jinghui, E-mail: gaojinghui@mail.xjtu.edu.cn; Zhong, Lisheng [Multi-Disciplinary Materials Research Center, State Key Lab of Electrical Insulation and Power Equipment and Frontier Institute of Science and Technology, Xi'an, 710049 (China); Zhang, Lixue; Xue, Dezhen [Multi-Disciplinary Materials Research Center, State Key Lab of Electrical Insulation and Power Equipment and Frontier Institute of Science and Technology, Xi'an, 710049 (China); State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China); Kimoto, Takayoshi [Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki (Japan); Song, Minghui [Electron Microscopy Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki (Japan); Ren, Xiaobing [Multi-Disciplinary Materials Research Center, State Key Lab of Electrical Insulation and Power Equipment and Frontier Institute of Science and Technology, Xi'an, 710049 (China); State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China); Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047, Ibaraki (Japan)

    2014-02-07T23:59:59.000Z

    (1?x)(Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} (BZT-xBCT) Pb-free piezoceramic has been reported showing ultrahigh piezoelectric performance in its morphotropic phase boundary (MPB) region. However, the crystal structure characteristic for the MPB composition of BZT-xBCT is still under debate—between single orthorhombic phase and tetragonal + rhombohedral two phase mixture. In the present study, we perform the local symmetry determination on the MPB composition x = 0.5 using convergent beam electron diffraction analysis (CBED). Our CBED results from multiple zone axes suggest that there are two coexisting phases with the point group symmetries of 4?mm (tetragonal) and 3?m (rhombohedral) respectively, which agree with two phase mixture model. The strong piezoelectricity can thus be understood by considering the polarization rotation between tetragonal and rhombohedral phases by external field.

  11. Low-frequency inelastic light scattering in a ZBLAN (ZrF{sub 4}-BaF{sub 2}-LaF{sub 3}-AlF{sub 3}-NaF) glass

    SciTech Connect (OSTI)

    Adichtchev, S. V.; Malinovsky, V. K.; Surovtsev, N. V., E-mail: lab21@iae.nsk.su [Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090 (Russian Federation); Ignatieva, L. N.; Merkulov, E. B. [Institute of Chemistry, Far East Branch of Russian Academy of Sciences, Vladivostok 690022 (Russian Federation)] [Institute of Chemistry, Far East Branch of Russian Academy of Sciences, Vladivostok 690022 (Russian Federation)

    2014-05-14T23:59:59.000Z

    Low-frequency (down to 30 GHz) inelastic light scattering is studied in a multicomponent glass ZBLAN (ZrF{sub 4}-BaF{sub 2}-LaF{sub 3}-AlF{sub 3}-NaF) in a wide temperature range. The contributions of the THz vibrational spectrum (boson peak) and of the fast relaxation are extracted and analyzed. It is shown that the fast relaxation spectrum is described by a distribution of relaxation times leading to a power-law ?{sup ?} dependence in the frequency range 30–300 GHz. Temperature dependence of ?(T) is well described by the Gilroy-Phillips model, while the integrated intensity of the fast relaxation increases significantly with the temperature. This feature distinguishes the fast relaxation in ZBLAN from the case of most single-component glasses. Thermodynamic and kinetic fragility indexes are significantly different for the ZBLAN glass. The correlations between the boson peak intensity, elastic moduli, and fragility index, found earlier for single-component glasses, are fulfilled for the thermodynamic fragility index of ZBLAN. In contrast, the correlation between the fast relaxation intensity at T{sub g} and the fragility holds better for the kinetic fragility index of ZBLAN. We propose that thermodynamic and kinetic fragilities reflect different aspects of glassy dynamics in the case of glass formers with the complex chemical composition and structure topology: the former correlates with the elastic properties and the boson peak, the latter with the relaxation.

  12. Strong Enhancement of Flux Pinning in YBa2Cu3O7-? Multilayers with Columnar Defects Comprised of Self-Assembled BaZrO3

    SciTech Connect (OSTI)

    Kang, Sukill [ORNL; Leonard, Keith J [ORNL; Martin, Patrick M [ORNL; Li, Jing [ORNL; Goyal, Amit [ORNL

    2007-01-01T23:59:59.000Z

    Multilayer structures comprising YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) films with columns of self-assembled BaZrO{sub 3} (BZO) nanodots with interlayers of CeO{sub 2} or pure YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} were grown on rolling-assisted biaxially textured substrates (RABiTSs) using pulsed laser deposition. A significant enhancement of the critical current density (J{sub c}) was observed for the multilayers compared with a single layer of YBCO + BZO. J{sub c} varies as J{sub c}{approx}H{sup -{alpha}} with a of 0.27 for single layer of YBCO + BZO and 0.34 for both multilayered films. Enhancement of pinning in the multilayers is attributed to the presence of columnar defects comprised of self-assembled nanodots of BZO as well as planar CuO-type stacking defects arising as a result of interfacial reactions in the multilayers.

  13. Anode-supported tubular SOFCs based on BaZr0.1Ce0.7Y0.1Yb0.1O3?? electrolyte fabricated by dip coating

    SciTech Connect (OSTI)

    Chen, Changcheng; Liu, Mingfei; Bai, Yaohui; Yang, Lei; Xie, Erqing; Liu, Meilin

    2011-01-01T23:59:59.000Z

    Anode-supported tubular solid oxide fuel cells (SOFCs) based on a proton and oxide ion mixed conductor, BaZr{sub 0.1}Ce{sub 0.7}Y{sub 0.1}Yb{sub 0.1}O{sub 3 ? ?} (BZCYYb), have been fabricated using a dip coating and co-firing process. This new fabrication technique effectively reduced the Ohmic resistances of tubular cells to ~ 0.1 and ~ 0.3 ? cm{sup 2} at 750 and 600 °C, respectively. Typical tubular cells with Ni-BZCYYb anode, BZCYYb electrolyte, and La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3 ? ?} (LSCF)-BZCYYb composite cathode demonstrated much-improved performance, achieving peak power densities of 1.13, 0.81, 0.63, and 0.53 W cm{sup ? 2} at 750, 700, 650, and 600 °C, respectively, when humidified (3 v% water vapor) hydrogen was used as fuel and ambient air as oxidant.

  14. Preparation and dielectric properties of Ba{sub 0.95}Ca{sub 0.05}Ti{sub 0.8}Zr{sub 0.2}O{sub 3}-polyethersulfone composites

    SciTech Connect (OSTI)

    Wang Fajun; Li Wen; Jiang Hongliu; Xue Mingshan; Lu Jinshan; Yao Junping [School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063 (China)

    2010-02-15T23:59:59.000Z

    We report the preparation and dielectric properties of ceramic-polymer composites using Ba{sub 0.95}Ca{sub 0.05}Ti{sub 0.8}Zr{sub 0.2}O{sub 3} (BCTZ) as a ceramic filler and polyethersulfone (PES) as a polymer matrix. The BCTZ powders were synthesized by a sol-gel method to fabricate BCZT-PES composites. The composites with various BCTZ volume fractions were prepared by a solution mixing and hot-pressing method. The composite with 50 vol % BCTZ showed high dielectric constant ({epsilon}=48.80) and low loss (tan {delta}=0.042) at 1 kHz and room temperature. Such excellent dielectric properties of the composites displayed an acceptable stability within a wide range of temperature (from 20 to 150 deg. C) and frequency (from 100 Hz to 100 kHz). The present work indicates that the BCTZ-PES composite can be a candidate for embedded capacitors.

  15. Domain wall motion and electromechanical strain in lead-free piezoelectrics: Insight from the model system (1 ? x)Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}–x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} using in situ high-energy X-ray diffraction during application of electric fields

    SciTech Connect (OSTI)

    Tutuncu, Goknur [Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States); Li, Binzhi [Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, California 95616 (United States); Bowman, Keith [Illinois Institute of Technology, Armour College of Engineering, Chicago, Illinois 60616 (United States); School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Jones, Jacob L., E-mail: JacobJones@ncsu.edu [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)

    2014-04-14T23:59:59.000Z

    The piezoelectric compositions (1 ? x)Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}–x(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} (BZT-xBCT) span a model lead-free morphotropic phase boundary (MPB) between room temperature rhombohedral and tetragonal phases at approximately x?=?0.5. In the present work, in situ X-ray diffraction measurements during electric field application are used to elucidate the origin of electromechanical strain in several compositions spanning the tetragonal compositional range 0.6???x???0.9. As BCT concentration decreases towards the MPB, the tetragonal distortion (given by c/a-1) decreases concomitantly with an increase in 90° domain wall motion. The increase in observed macroscopic strain is predominantly attributed to the increased contribution from 90° domain wall motion. The results demonstrate that domain wall motion is a significant factor in achieving high strain and piezoelectric coefficients in lead-free polycrystalline piezoelectrics.

  16. Co.ra

    Office of Legacy Management (LM)

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  17. RA

    National Nuclear Security Administration (NNSA)

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  18. eRA Training Team1 Terminations

    E-Print Network [OSTI]

    Baker, Chris I.

    eRA Training Team1 xTrain Terminations Electronic Research Administration Sponsored by: The National Institutions of Health, Office of Extramural Research April 2010 #12;eRA Training Team2 xTrain General Information xTrain Overview The following section provides general information on the xTrain

  19. eRA Training Team1 Terminations

    E-Print Network [OSTI]

    Baker, Chris I.

    eRA Training Team1 xTrain Terminations Electronic Research Administration Sponsored by: The National Institutes of Health, Office of Extramural Research March 2012 #12;eRA Training Team2 xTrain General Information xTrain Overview The following section provides general information on the xTrain

  20. The analysis of Ytrium doped BaZrO3

    Office of Scientific and Technical Information (OSTI)

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  1. RAPID METHOD FOR DETERMINATION OF {sup 228}Ra IN WATER SAMPLES

    SciTech Connect (OSTI)

    Maxwell, S.

    2012-09-05T23:59:59.000Z

    A new rapid method for the determination of {sup 228}Ra in natural water samples has been developed at the SRNL/EBL (Savannah River National Lab/ Environmental Bioassay Laboratory) that can be used for emergency response or routine samples. While gamma spectrometry can be employed with sufficient detection limits to determine {sup 228}Ra in solid samples (via {sup 228}Ac) , radiochemical methods that employ gas flow proportional counting techniques typically provide lower MDA (Minimal Detectable Activity) levels for the determination of {sup 228}Ra in water samples. Most radiochemical methods for {sup 228}Ra collect and purify {sup 228}Ra and allow for {sup 228}Ac daughter ingrowth for ~36 hours. In this new SRNL/EBL approach, {sup 228}Ac is collected and purified from the water sample without waiting to eliminate this delay. The sample preparation requires only about 4 hours so that {sup 228}Ra assay results on water samples can be achieved in < 6 hours. The method uses a rapid calcium carbonate precipitation enhanced with a small amount of phosphate added to enhance chemical yields (typically >90%), followed by rapid cation exchange removal of calcium. Lead, bismuth, uranium, thorium and protactinium isotopes are also removed by the cation exchange separation. {sup 228}Ac is eluted from the cation resin directly onto a DGA Resin cartridge attached to the bottom of the cation column to purify {sup 228}Ac. DGA Resin also removes lead and bismuth isotopes, along with Sr isotopes and {sup 90}Y. La is used to determine {sup 228}Ac chemical yield via ICP-MS, but {sup 133}Ba can also be used instead if ICP-MS assay is not available. Unlike some older methods, no lead or strontium holdback carriers or continual readjustment of sample pH is required.

  2. Nuclear fusion as a probe for octupole deformation in $^{224}$Ra

    E-Print Network [OSTI]

    Kumar, Raj; Vitturi, A

    2015-01-01T23:59:59.000Z

    $\\textit{Background}$: Nuclear fusion has been shown to be a perfect probe to study the different nuclear shapes. However, the possibility of testing octupole deformation of a nucleus with this tool has not been fully explored yet. The presence of a stactic octupole deformation in nuclei will enhanced a possible permanent electric dipole moment, leading to a possible demonstration of parity violation. $\\textit{Purpose}$: To check whether static octupole deformation or octupole vibration in fusion give qualitatively different results so that both situations can be experimentally disentangled. $\\textit{Method}$: Fusion cross sections are computed in the Coupled-Channels formalism making use of the Ingoing-Wave Boundary Conditions (IWBC) for the systems $^{16}$O+$^{144}$Ba and $^{16}$O+$^{224}$Ra. $\\textit{Results}$: Barrier distributions of the two considered schemes show different patterns. For the $^{224}$Ra case, the octupole deformation parameter is large enough to create a sizeable difference. $\\textit{Con...

  3. Giant anelastic responses in (BaZrO -ZnO)-BaTiO

    E-Print Network [OSTI]

    Lakes, Roderic

    in the case of ceramic matrix composites which are usually synthesized via the solid-state reaction method. Porous interface and its brittleness nature are inevitable drawbacks for ceramic matrix composites, no experimental report is available (a)E-mail: lakes@engr.wisc.edu on ceramic matrix composites with negative

  4. Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes

    E-Print Network [OSTI]

    Claudia Travaglio; Roberto Gallino; Enrico Arnone; John Cowan; Faith Jordan; Chris Sneden

    2003-10-07T23:59:59.000Z

    We follow the Galactic enrichment of three easily observed light n-capture elements Sr,Y,and Zr.Input stellar yields have been first separated into their respective main and weak s-process,and r-process components.The s-process yields from AGB stars are computed,exploring a wide range of efficiencies of the major neutron source,13C,and covering both disk and halo metallicities.AGBs have been shown to reproduce the main s-component in the solar system.The concurrent weak s-process,which accounts for the major fraction of the light s-process isotopes in the solar system and occurs in massive stars by the operation of the 22Ne n-source,is discussed in detail.Neither the main s-,nor the weak s-components are shown to contribute significantly to the n-capture element abundances observed in unevolved halo stars.We present a detailed analysis of a large database of spectroscopic observations of Sr,Y,Zr, Ba,and Eu for Galactic stars at various metallicities.Spectroscopic observations of Sr,Y,and Zr to Ba and Eu abundance ratios versus metallicity provide useful diagnostics of the types of n-capture processes forming Sr,Y and Zr.The observed [Sr,Y,Zr/Ba,Eu] ratio is clearly not flat at low metallicities,as we would expect if Ba,Eu and Sr,Y,Zr all had the same r-process origin.We discuss our chemical evolution predictions, taking into account the interplay between different processes to produce Sr-Y-Zr.We find hints for a primary process in low-metallicity massive stars, different from the 'classical s-process' and from the 'classical r-process',that we tentatively define LEPP (Lighter Element Primary Process).This allows us to revise the estimates of the r-process contributions to the solar Sr,Y and Zr abundances,as well as of the contribution to the s-only isotopes 86Sr,87Sr,96Mo.

  5. Ra-226 radioassay of soil and tailings

    SciTech Connect (OSTI)

    Sabau, C.S.; Rayno, D.R.; Kretz, N.D.; Zelle, P.W.

    1983-01-01T23:59:59.000Z

    Studies of inactive uranium tailings piles have shown that tailings sands containing Ra-226 and other radionuclides may be dispersed by wind and water erosion, causing contamination of adjacent areas. To conduct an effective cleanup operation, it is necessary that boundaries of contamination be well defined. To accomplish this, data from surface gamma-ray surveys made under the Measurement Monitoring Program of the US DOE's Uranium Mill Tailings Remedial Action Project (UMTRAP) are first used to delineate a general outline of the contaminated area. Then, data from portable scintillometer surveys and from sealed-can gamma-ray analyses of soil samples are used to more precisely define the perimeter of Ra-226 contamination. These field measurements are supported by radiochemical analyses of randomly selected samples. Because of its adaptability to the widely varying chemical composition of the material in these samples, the complexing agent EDTA is used in a complexometric leaching procedure to analyze Ra-226. By this procedure, natural concentrations of Ra-226 in soil (approx. 1 pCi/g) can be measured routinely. The potential limit of detection is in the 0.1 to 0.5 pCi/g range. Details of the method, which includes leaching of radium followed by radon de-emanation, are described. Comparative data for various soil and tailings samples are presented.

  6. BA War & Society Module Information

    E-Print Network [OSTI]

    Harman, Neal.A.

    BA War & Society Module Information 2014-2015 www.swansea.ac.uk/artsandhumanities Arts Studies BA War & Society BA War & Society The scope and scale of the BA (Hons) War and Society degree Theories of War 1 (compulsory) HUA102 War and Warfare in the Modern World (compulsory) HIH118 World History

  7. Investigation of Zr-doped BSCF perovskite membrane for oxygen separation in the intermediate temperature range

    SciTech Connect (OSTI)

    Ravkina, Olga, E-mail: olga.ravkina@pci.uni-hannover.de [Gottfried Wilhelm Leibniz Universität Hannover, Institute of Physical Chemistry and Electrochemistry, Callinstr. 3A, 30167 Hannover (Germany); Klande, Tobias; Feldhoff, Armin [Gottfried Wilhelm Leibniz Universität Hannover, Institute of Physical Chemistry and Electrochemistry, Callinstr. 3A, 30167 Hannover (Germany)

    2013-05-15T23:59:59.000Z

    The series of (Ba{sub 0.5}Sr{sub 0.5})(Co{sub 0.8}Fe{sub 0.2}){sub 1?z}Zr{sub z}O{sub 3??} (z=0, 0.01, 0.03, 0.05, 0.07, and 0.09) was synthesized by a sol–gel method. The materials with a zirconium content up to 3 mol% were found to be single phase. Further increase results in formation of a mixed (Ba,Sr)ZrO{sub 3} by-phase, which was found along the grain boundaries and in the grains. With increasing zirconium content the oxygen permeation flux decreases considerably. The effect of the zirconium substitution on the long-term phase stability was investigated by long-term oxygen permeation experiments and X-ray diffraction. A slight stabilization of the oxygen flux of (Ba{sub 0.5}Sr{sub 0.5})(Co{sub 0.8}Fe{sub 0.2}){sub 0.97}Zr{sub 0.03}O{sub 3??} was found after 180 h at 1023 K. However, all compositions show a decrease in permeation flux with time, but the pure BSCF membrane exhibited the strongest drop after 180 h of operation. The decomposition products of the cubic perovskite phase were found to be a hexagonal Ba{sub 0.5±x}Sr{sub 0.5±x}CoO{sub 3} and a rhombohedral Ba{sub 1?x}Sr{sub x}Co{sub 2?y}Fe{sub y}O{sub 5??}. - Graphical abstract: Backscattered-electron channeling contrast image of BSCF membrane cross-section after long-term oxygen permeation at 1023 K showing different phases in different colors. Highlights: ? Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3??} systematically doped with increasing amount of zirconium. ? Cubic single-phase materials up to 3 wt% zirconium. ? Mixed (Ba,Sr)ZrO{sub 3} by-phase formed mainly in the grain boundaries. ? Jänecke prism was proposed by XRD and EDXS data. ? (Ba{sub 0.5}Sr{sub 0.5})(Co{sub 0.8}Fe{sub 0.2}){sub 0.97}Zr{sub 0.03}O{sub 3??} showed a slight stabilization of oxygen flux as compared to pure Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3??}.

  8. R.A. Spicer -Publications. January, 2010 1 R.A. Spicer Publications -Articles, Papers and Books

    E-Print Network [OSTI]

    Spicer, Robert A

    2 108. Spicer, R.A., Ahlberg, A., Herman, A.B., Hofmann, C-C., Raikevich, M., Valdes, P -de Leon, M.P., Spicer, R.A., and Steart, D.C., In Press. Climatic reconstruction of two Pliocene Yakutia). Palaeogeography, Palaeoclimatolgy, Palaeoecology, 111. Moiseeva, M.G., Herman, A.B., and Spicer

  9. OXYDATION COMPARE DU NIOBIUM ET D'UN ALLIAGE (P 353 M) A BA SE DE NIOBIUM

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    519 OXYDATION COMPARÉE DU NIOBIUM ET D'UN ALLIAGE (P 353 M) A BA SE DE NIOBIUM E. FRIES, C. MARHIC'oxydation comparée du Niobium pur et d'un alliage à base de Niobium de composition suivante : W V Ti Zr C 10 % 1 100 h. Dans les deux cas (niobium et alliage) on a mis en évidence la présence de trois formes de l

  10. Enthalpy of mixing of liquid Ni-Zr and Cu-Ni-Zr alloys

    SciTech Connect (OSTI)

    Witusiewicz, V.T.; Sommer, F.

    2000-04-01T23:59:59.000Z

    Since the Al-Cu-Ni-Zr system is a basis for the production of bulk amorphous materials by rapid solidification techniques from the liquid state, it is of great scientific interest to determine the partial and the integral thermodynamic functions of liquid and undercooled liquid alloys. Such data, as was pointed out previously, are important in order to understand their extremely good glass-forming ability in multicomponent metallic systems as well as for processing improvements. In order to measure the thermodynamic properties of the Al-Cu-Ni-Zr quaternary, it is necessary to have reliable thermochemical data for its constituent canaries and ternaries first. In a series of articles, the authors have reported in detail the thermodynamic properties of liquid Al-Cu, Al-Ni, Cu-Ni, Cu-Zr, Al-Zr, Al-Cu-Ni, and Al-Cu-Zr alloys. This article deals with the direct calorimetric measurements of the partial and the integral enthalpies of mixing of liquid Ni-Zr and Cu-Ni-Zr alloys and the heat capacity of liquid Ni{sub 26}Zr{sub 74}. In a subsequent article, the authors will present similar data for the liquid ternary Al-Ni-Zr and for the liquid quaternary Al-Cu-Ni-Zr alloys.

  11. Intermediate Major Full Major BUSIBA.I Intmd Business BA ARTHBA Art History BA

    E-Print Network [OSTI]

    Tipple, Brett

    Studies HBS GEOSBS Geoscience BSG ESS.BA Exercise & Sport Sci BA GEOSHBS Geoscience HSG ESS.BS Exercise & Sport Sci BS GERMBA German BA ESS.HBS Exercise & Sport Sci HBS GERMHBA German HBA ESS.BS.T Exercise

  12. RAPID DETERMINATION OF RA-226 IN ENVIRONMENTAL SAMPLES

    SciTech Connect (OSTI)

    Maxwell, S.

    2012-01-03T23:59:59.000Z

    A new rapid method for the determination of {sup 226}Ra in environmental samples has been developed at the Savannah River Site Environmental Lab (Aiken, SC, USA) that can be used for emergency response or routine sample analyses. The need for rapid analyses in the event of a Radiological Dispersive Device or Improvised Nuclear Device event is well-known. In addition, the recent accident at Fukushima Nuclear Power Plant in March, 2011 reinforces the need to have rapid analyses for radionuclides in environmental samples in the event of a nuclear accident. {sup 226}Ra (T1/2 = 1,620 years) is one of the most toxic of the long-lived alpha-emitters present in the environment due to its long life and its tendency to concentrate in bones, which increases the internal radiation dose of individuals. The new method to determine {sup 226}Ra in environmental samples utilizes a rapid sodium hydroxide fusion method for solid samples, calcium carbonate precipitation to preconcentrate Ra, and rapid column separation steps to remove interferences. The column separation process uses cation exchange resin to remove large amounts of calcium, Sr Resin to remove barium and Ln Resin as a final purification step to remove {sup 225}Ac and potential interferences. The purified {sup 226}Ra sample test sources are prepared using barium sulfate microprecipitation in the presence of isopropanol for counting by alpha spectrometry. The method showed good chemical recoveries and effective removal of interferences. The determination of {sup 226}Ra in environmental samples can be performed in less than 16 h for vegetation, concrete, brick, soil, and air filter samples with excellent quality for emergency or routine analyses. The sample preparation work takes less than 6 h. {sup 225}Ra (T1/2 = 14.9 day) tracer is used and the {sup 225}Ra progeny {sup 217}At is used to determine chemical yield via alpha spectrometry. The rapid fusion technique is a rugged sample digestion method that ensures that any refractory radium particles are effectively digested. The preconcentration and column separation steps can also be applied to aqueous samples with good results.

  13. Simulation of Heat Treatment Distortion R.A. Hardin1

    E-Print Network [OSTI]

    Beckermann, Christoph

    quenched in water and in oil. Unfortunately, due to the lack of documentation on the heat treatment process a test piece casting to be produced at a participating foundry to provide data on heat treatmentSimulation of Heat Treatment Distortion R.A. Hardin1 and C. Beckermann2 1 Research Engineer, 2

  14. NEWS & VIEWS X-RaY oPtiCS

    E-Print Network [OSTI]

    Loss, Daniel

    NEWS & VIEWS X-RaY oPtiCS Clarity through a keyhole Janos Hajdu1,2 & Filipe R. n. C. maia2 are at 1 Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo, as it does in conventional crystallography, but only on the wavelength used, the extent of ionization damage

  15. Thermoelectric Transport in a ZrN/ScN Superlattice

    E-Print Network [OSTI]

    2009-01-01T23:59:59.000Z

    at Springerlink.com Thermoelectric Transport in a ZrN/ScNthe potential for a high thermoelectric ?gure of merit. Theexperimental studies of the thermoelectric transport in ZrN/

  16. BA Philosophy, Politics and Law

    E-Print Network [OSTI]

    Harman, Neal.A.

    BA Philosophy, Politics and Law (PPL) Module Information 2013-2014 Arts and Humanities College of www.swansea.ac.uk/artsandhumanities Department of Politcial and Cultural Studies #12;PPL at Swansea Swansea offers one of only two PPL degrees in the UK. Building on the successfully launch of our PPE

  17. Enhanced pinning in YBCO films with BaZrO.sub.3 nanoparticles

    DOE Patents [OSTI]

    Driscoll, Judith L.; Foltyn, Stephen R.

    2010-06-15T23:59:59.000Z

    A process and composition of matter are provided and involve flux pinning in thin films of high temperature superconductive oxides such as YBCO by inclusion of particles including barium and a group 4 or group 5 metal, such as zirconium, in the thin film.

  18. Performance & Risk Assessment Community of Practice (P&RA CoP...

    Broader source: Energy.gov (indexed) [DOE]

    P&RA CoP's Technical Exchange Meeting held on December 11-12, 2014 in Las Vegas, NV P&RA CoP's Technical Exchange Meeting held on December 11-12, 2014 in Las Vegas, NV P&RA CoP's...

  19. Octupole collectivity in $^{220}$Rn and $^{224}$Ra

    E-Print Network [OSTI]

    Gaffney, Liam Paul

    Collective properties of the radioactive nuclei $^{220}$Rn and $^{224}$Ra have been studied via Coulomb excitation of a $2.8$~A.MeV radioactive ion beam (RIB) incident upon $^{60}$Ni, $^{112,114}$Cd and $^{120}$Sn targets. The experiments took place at the REX-ISOLDE RIB facility, CERN. De-excitation $gamma$-ray yields following multiple-step Coulomb excitation were detected in coincidence with recoiling target nuclei in the Miniball spectrometer. For the first time, $B(E3;3^{+} ightarrow0^{+})$ values have been directly measured with a radioactive ion beam. In the process, $^{224}$Ra becomes the heaviest post-accelerated RIB to date at ISOLDE (with the possible exception of the quasi-stable $^{238}$U). The measurements presented in this thesis represent a tripling of the number of nuclei around $Zsimeq88$ and $Nsimeq134$, for which direct measurements of the octupole collectivity have been performed. The only previous measurements being for the relatively long-lived $^{226}$Ra. The $gamma$-ray yields, in con...

  20. Bremsstrahlung emission during $?$-decay of $^{226}{\\rm Ra}$

    E-Print Network [OSTI]

    Giorgio Giardina; Giovanni Fazio; Giuseppe Mandaglio; Marina Manganaro; Serghei P. Maydanyuk; Vladislav S. Olkhovsky; Nikolay V. Eremin; Anton A. Paskhalov; Dmitry A. Smirnov; Carmelo Sacca

    2008-04-16T23:59:59.000Z

    We obtained the spectrum of probability of the bremsstrahlung emission accompanying the $\\alpha$-decay of $^{226}{\\rm Ra}$ (E$_{\\alpha}$=4.8 MeV) by measuring the $\\alpha$-$\\gamma$ coincidences and using the model presented in our previous study on the $\\alpha-$decay of $^{214}{\\rm Po}$ (E$_{\\alpha}$=7.7 MeV). We compare the experimental data with the quantum mechanical calculation and find a good agreement between theory and experiment. We discuss the differences between the photon spectra connected with the $\\alpha$-decay of the $^{226}{\\rm Ra}$ and $^{214}{\\rm Po}$ nuclei. For the two mentioned nuclei we analyze the bremsstrahlung emission contributions from the tunneling and external regions of the nucleus barrier into the total spectrum, and we find the destructive interference between these contributions. We also find that the emission of photons during tunneling of the $\\alpha$-particle gives an important contribution to the bremsstrahlung spectrum in the whole E$_{\\gamma}$ energy range of the studied $^{226}$Ra nucleus.

  1. Ra Solar Systems Solutions SL | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I GeothermalPotentialBiopowerSolidGenerationMethodInformationeNevada <RECServices,RYPOS Inc Jump to:Ra

  2. BA Economics and BA Financial Economics Assessment Plan Program Learning Objectives

    E-Print Network [OSTI]

    Cantlon, Jessica F.

    BA Economics and BA Financial Economics ­ Assessment Plan Program Learning Objectives The program will prepare graduates: 1. Understand the "economic way model economic decisions. 3. The ability to analyze historical and current events

  3. The Bayo Canyon/radioactive lanthanum (RaLa) program

    SciTech Connect (OSTI)

    Dummer, J.E.; Taschner, J.C.; Courtright, C.C.

    1996-04-01T23:59:59.000Z

    LANL conducted 254 radioactive lanthanum (RaLa) implosion experiments Sept. 1944-March 1962, in order to test implosion designs for nuclear weapons. High explosives surrounding common metals (surrogates for Pu) and a radioactive source containing up to several thousand curies of La, were involved in each experiment. The resulting cloud was deposited as fallout, often to distances of several miles. This report was prepared to summarize existing records as an aid in evaluating the off-site impact, if any, of this 18-year program. The report provides a historical setting for the program, which was conducted in Technical Area 10, Bayo Canyon about 3 miles east of Los Alamos. A description of the site is followed by a discussion of collateral experiments conducted in 1950 by US Air Force for developing an airborne detector for tracking atmospheric nuclear weapons tests. All known off-site data from the RaLa program are tabulated and discussed. Besides the radiolanthanum, other potential trace radioactive material that may have been present in the fallout is discussed and amounts estimated. Off-site safety considerations are discussed; a preliminary off-site dose assessment is made. Bibliographical data on 33 persons important to the program are presented as footnotes.

  4. Compression mode resonances in Zr-90

    E-Print Network [OSTI]

    Youngblood, David H.; Lui, YW; John, B.; Tokimoto, Y.; Clark, HL; Chen, X.

    2004-01-01T23:59:59.000Z

    Compression mode resonances in 90Zr D. H. Youngblood, Y.-W. Lui, B. John,* Y. Tokimoto, H. L. Clark, and X. Chen Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA (Received 18 February 2004; published 20 May 2004..., JOHN, TOKIMOTO, CLARK, AND CHEN PHYSICAL REVIEW C 69, 054312 (2004) 054312-2 Fig. 2. The continuum distributions are similar over the en- tire energy range, whereas the angular distributions of the cross sections for the peak change...

  5. Characterization of Zr-Fe-Cu Alloys for an Inert Matrix Fuel for Nuclear Energy Applications 

    E-Print Network [OSTI]

    Barnhart, Brian A.

    2013-08-09T23:59:59.000Z

    distinct phase morphologies. The top half of the sample was Zr rich and contained Zr precipitates dispersed in a matrix of intermetallic compounds while the bottom half consisted solely of intermetallic compounds. The third alloy, Zr-12Fe-15Cu...

  6. Investigation of Zr-C, Zr-N, and Potential Agostic Interactions in an Organozirconium Complex by Experimental

    E-Print Network [OSTI]

    Coppens, Philip

    fragment (Zr-C ) 2.43(5) Å), and the amide nitrogen atom (Zr-N ) 2.0312(5) Å) of the second ligand to titanium,1 and agostic interactions have been proposed on the basis of lengthened C-C bonds, dramati- cally.87(4)°, as compared to a value of 130.4(4)° in a similar titanium complex.6 Although a (C-H), ,,Zr interaction

  7. A correlation between soil descriptions and {sup 226}Ra concentrations in Florida soils

    SciTech Connect (OSTI)

    Harrison, D.P.

    1992-12-31T23:59:59.000Z

    The soil radium content in Florida is highly variable. The range in radium concentrations, where the samples involved in this study are concerned, is from 0.1 pCi/g to 18.5 pCi/g. Low {sup 226}Ra concentrations (0.1 to 5 pCi/g) are evidenced in sands, moderate concentrations (5 to 11 pCi/g) are found in silt and gravel, and high {sup 226}Ra concentrations (>11 pCi/g) are found in soil horizons with shell, clay, and strata with phosphate. Strata containing phosphate yields a high concentration of {sup 226}Ra. The information obtained in this study, soil descriptions with their corresponding {sup 226}Ra concentrations, comes from geological cores drilled by geotechnical consultants with gamma spectrometry analysis performed by high resolution gamma spectroscopy. Concentration; of {sup 226}Ra generally increase with depth. These cores are usually terminated at 20 feet deep, with some cores being shallower than this due to hitting bedrock or encountering the water table. These frequency distributions give the core-logging geologist an approximate concentration of {sup 226}Ra based on the description of the soil. Since the correlation of {sup 226}Ra and soil descriptions can be used as a tool in assigning indoor radon potential, this study is of importance to land managers, contractors, developers, and regulating agencies who are attempting to place standards on tracts of land with {sup 226}Ra concentration used as a criterion.

  8. Interdiffusion between Zr Diffusion Barrier and U-Mo Alloy

    SciTech Connect (OSTI)

    K. Huang; Y. Park; Y. H. Sohn

    2012-12-01T23:59:59.000Z

    U-Mo alloys are being developed as low enrichment uranium fuels under the Reduced Enrichment for Research and Test Reactor (RERTR) program. Significant reactions have been observed between U-Mo fuels and Al or Al alloy matrix. Refractory metal Zr has been proposed as barrier material to reduce the interactions. In order to investigate the compatibility and barrier effects between U-Mo alloy and Zr, solid-to-solid U-10wt.%Mo vs. Zr diffusion couples were assembled and annealed at 600, 700, 800, 900 and 1000 °C for various times. The microstructures and concentration profiles due to interdiffusion and reactions were examined via scanning electron microscopy and electron probe microanalysis, respectively. Intermetallic phase Mo2Zr was found at the interface and its population increased when annealing temperature decreased. Diffusion paths were also plotted on the U-Mo-Zr ternary phase diagrams with good consistency. The growth rate of interdiffusion zone between U-10wt.%Mo and Zr was also calculated under the assumption of parabolic diffusion, and was determined to be about 103 times lower than the growth rate of diffusional interaction layer found in diffusion couples U-10wt.%Mo vs. Al or Al-Si alloy. Other desirable physical properties of Zr as barrier material, such as neutron adsorption rate, melting point and thermal conductivity are presented as supplementary information to demonstrate the great potential of Zr as the diffusion barrier for U-Mo fuel systems in RERTR.

  9. Producing a compound Nucleus via Inelastic Scattering: The 90Zr(alpha,alpha')90Zr* Case

    SciTech Connect (OSTI)

    Escher, J E; Dietrich, F S

    2008-05-23T23:59:59.000Z

    In a Surrogate reaction a compound nucleus is produced via a direct reaction (pickup, stripping, or inelastic scattering). For a proper application of the Surrogate approach it is necessary to predict the resulting angular momentum and parity distribution in the compound nucleus. A model for determining these distributions is developed for the case of inelastic alpha scattering off a spherical nucleus. The focus is on obtaining a first, simple description of the direct-reaction process that produces the compound nucleus and on providing the basis for a more complete treatment of the problem. The approximations employed in the present description are discussed and the extensions required for a more rigorous treatment of the problem are outlined. To illustrate the formalism, an application to {sup 90}Zr({alpha},{alpha}{prime}){sup 90}Zr* is presented.

  10. PoPulation Differentiation anD raPiD evolution of egg Color in aCCorDanCe with Solar raDiation

    E-Print Network [OSTI]

    Lahti, David C.

    PoPulation Differentiation anD raPiD evolution of egg Color in aCCorDanCe with Solar raDiation Davi, . Diferenciación entre Poblaciones y Evolución Rápida del Color de los Huevos de Acuerdo a la Radiación Solar Uy C P' R d Pm wb, ://www.j. m/I.. DOI: 10.1525/k.2008.07033DOI: 10.1525/k.2008.07033 Bird egg color

  11. Audit Report: OAS-RA-12-12 | Department of Energy

    Energy Savers [EERE]

    Audit Report: OAS-RA-12-12 May 22, 2012 The Department of Energy's Clean Cities Alternative Fuel Vehicle Grant Program Funded under the American Recovery and Reinvestment Act...

  12. Ra, a naturally occurring isotope of the 238 U-series with a

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    for counting, liquid scintillation, or mass spectrometry at comparable activities, the simple setup, low cost- fiber and is continuously transferred to a scintillation cham- 226 Ra determination via the rate of 222

  13. First In Vivo Evaluation of Liposome-encapsulated 223Ra as a Potential Alpha-particle-emitting Cancer Therapeutic Agent

    SciTech Connect (OSTI)

    Jonasdottir, Thora J.; Fisher, Darrell R.; Borrebaek, Jorgen; Bruland, Oyvind S.; Larsen, Roy H.

    2006-09-13T23:59:59.000Z

    Liposomes carrying chemotherapeutics have had some success in cancer treatment and may be suitable carriers for therapeutic radionuclides. This study was designed to evaluate the biodistribution of and to estimate the radiation doses from the alpha emitter 223Ra loaded into pegylated liposomes in selected tissues. 223Ra was encapsulated in pegylated liposomal doxorubicin by ionophore-mediated loading. The biodistribution of liposomal 223Ra was compared to free cationic 223Ra in Balb/C mice. We showed that liposomal 223 Ra circulated in the blood with an initial half-time in excess of 24 hours, which agreed well with that reported for liposomal doxorubicin in rodents, while the blood half-time of cationic 223Ra was considerably less than one hour. When liposomal 223 Ra was catabolized, the released 223Ra was either excreted or taken up in the skeleton. This skeletal uptake increased up to 14 days after treatment, but did not reach the level seen with free 223Ra. Pre-treatment with non-radioactive liposomal doxorubicin 4 days in advance lessened the liver uptake of liposomal 223 Ra. Dose estimates showed that the spleen, followed by bone surfaces, received the highest absorbed doses. Liposomal 223 Ra was relatively stable in vivo and may have potential for radionuclide therapy and combination therapy with chemotherapeutic agents.

  14. Track Finding Efficiency in BaBar

    E-Print Network [OSTI]

    T. Allmendinger; B. Bhuyan; D. N. Brown; H. Choi; S. Christ; R. Covarelli; M. Davier; A. G. Denig; M. Fritsch; A. Hafner; R. Kowalewski; O. Long; A. M. Lutz; M. Martinelli; D. R. Muller; I. M. Nugent; D. Lopes Pegna; M. V. Purohit; E. Prencipe; J. M. Roney; G. Simi; E. P. Solodov; A. V. Telnov; E. Varnes; R. Waldi; W. F. Wang; R. M. White

    2012-07-12T23:59:59.000Z

    We describe several studies to measure the charged track reconstruction efficiency and asymmetry of the BaBar detector. The first two studies measure the tracking efficiency of a charged particle using $\\tau$ and initial state radiation decays. The third uses the $\\tau$ decays to study the asymmetry in tracking, the fourth measures the tracking efficiency for low momentum tracks, and the last measures the reconstruction efficiency of $K_S^0$ particles. The first section also examines the stability of the measurements vs BaBar running periods.

  15. PII S0016-7037(00)00369-0 Ra isotopes and Rn in brines and ground waters of the Jordan-Dead Sea Rift Valley

    E-Print Network [OSTI]

    Yehoshua, Kolodny

    PII S0016-7037(00)00369-0 Ra isotopes and Rn in brines and ground waters of the Jordan-Dead Sea Valley waters being mixtures of fresh water with saline brines. Ra is efficiently extracted from surrounding rocks into the brine end member. 228 Ra/226 Ra ratios are exceptionally low 0.07 to 0.9, mostly

  16. On-line Excited-State Laser Spectroscopy of Trapped Short-Lived Ra$^+$ Ions

    E-Print Network [OSTI]

    O. O. Versolato; G. S. Giri; L. W. Wansbeek; J. E. van den Berg; D. J. van der Hoek; K. Jungmann; W. L. Kruithof; C. J. G. Onderwater; B. K. Sahoo; B. Santra; P. D. Shidling; R. G. E. Timmermans; L. Willmann; H. W. Wilschut

    2010-03-29T23:59:59.000Z

    As an important step towards an atomic parity violation experiment in one single trapped Ra$^+$ ion, laser spectroscopy experiments were performed with on-line produced short-lived $^{212,213,214}$Ra$^+$ ions. The isotope shift of the $6\\,^2$D$_{3/2}$\\,-\\,$7\\,^2$P$_{1/2}$ and $6\\,^2$D$_{3/2}$\\,-\\,$7\\,^2$P$_{3/2}$ transitions and the hyperfine structure constant of the $7\\,^2$S$_{1/2}$ and $6\\,^2$D$_{3/2}$ states in $^{213}$Ra$^+$ were measured. These values provide a benchmark for the required atomic theory. A lower limit of $232(4)$ ms for the lifetime of the metastable $6\\,^2$D$_{5/2}$ state was measured by optical shelving.

  17. Audit Report: OAS-RA-11-08 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 Audit Report:OAS-RA-11-02RA-11-08

  18. ccsd00001116 Nucleation of Al 3 Zr and Al 3 Sc in aluminum alloys

    E-Print Network [OSTI]

    ccsd­00001116 (version 1) : 4 Feb 2004 Nucleation of Al 3 Zr and Al 3 Sc in aluminum alloys: from 4, 2004) Zr and Sc precipitate in aluminum alloys to form the compounds Al3Zr and Al3Sc which

  19. Transformation plasticity and thermoelastic behavior in ZrO2-containing ceramics

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    565 Transformation plasticity and thermoelastic behavior in ZrO2-containing ceramics A. H. Heuer plasticity in Zr02-containing ceramics. The trans thermoélastique. Abstract.- Transformation plasticity in ZrO2, which is responsible for the high strength and high

  20. Hadron Physics in BaBar

    SciTech Connect (OSTI)

    Lafferty, G.D.; /Manchester U.

    2005-08-29T23:59:59.000Z

    Some recent results in hadron physics from the BaBar experiment are discussed. In particular, the observation of two new charmed states, the D*{sub sJ}{sup +}(2317) and the D*{sub sJ}{sup +}(2457), is described, and results are presented on the first measurement of the rare decay mode of the B meson, B{sup 0} {pi}{sup 0}{pi}{sup 0}.

  1. New Spectroscopy at BaBar

    SciTech Connect (OSTI)

    Mazzoni, M.A.; /INFN, Rome

    2007-04-18T23:59:59.000Z

    The Babar experiment at the SLAC B factory has accumulated a high luminosity that offers the possibility of systematic studies of quarkonium spectroscopy and of investigating rare new phenomena. Recent results in this field are presented. In recent times spectroscopy has become exciting again, after the discovery of new states that are not easily explained by conventional models. States such as the X(3872) and the Y(4260) could be new excited charmonium states, but require precise measurements for positive identification. The BaBar experiment [1] is installed at the asymmetric storage ring PEP-II. 90% of the data accumulated by BaBar are taken at the Y(4S) (10.58 GeV) and 10% just below (10.54 GeV). The BaBar detector includes a 5-layer, double-sided silicon vertex tracker and a 40-layer drift chamber in a 1.5 T solenoidal magnetic field, which detect charged particles and measures their momenta and ionization energy losses. Photons, electrons, and neutral hadrons are detected with a CsI(Tl)-crystal electromagnetic calorimeter. An internally reflecting ring-imaging Cherenkov is also used for particle id. Penetrating muon and neutral hadrons are identified by an array of resistive-plate chambers embedded in the steel of the flux return. The detector allows good track and vertex resolution, good particle id and good photon detection so it is especially suited for spectroscopy studies.

  2. Supply of purified Th228 for Ra224 generators. Final CRADA Report .

    SciTech Connect (OSTI)

    Ehst, D. A.; Nuclear Engineering Division

    2009-10-02T23:59:59.000Z

    CRADA was terminated when it was determined that the Russians could not perform the terms of the subcontract. It became apparent that the Russians would not be a reliable source of Th228, as a precursor in the decay chain which leads to Ra224. Their government policies will prohibit the export of Th228 in quantities needed for commercial cancer therapy.

  3. George Feher (Photograph by R.A. Icaacson) Photosynthesis Research 55: 140, 1998.

    E-Print Network [OSTI]

    Govindjee "Gov"

    George Feher (Photograph by R.A. Icaacson) #12;Photosynthesis Research 55: 1­40, 1998. © 1998 of research in bacterial photosynthesis and the road leading to it: A personal account George Feher In this minireview I present a very personal account of my life and research in bacterial photosynthesis

  4. August 2006 Grantee Registration Process in NIH eRA Commons

    E-Print Network [OSTI]

    Baker, Chris I.

    August 2006 Grantee Registration Process in NIH eRA Commons Detailed Steps STEP 1. Begin Grantee Registration Steps 1 #12;August 2006 · It may include numbers · It must contain letters · It may. 2. In the User ID box, type the user name you created for your Commons account. Grantee Registration

  5. RA After Hours On Call (971) 246-1388 Your Guide to

    E-Print Network [OSTI]

    Latiolais, M. Paul

    for the resident to pick up at the move-in station. Laundry Laundry facilities are located on odd-numbered floors is on for an extended amount of time, please notify the Help desk or the RA on call. If you leave trash, abandoned

  6. lated to attempts to induce RA in the ru-men in vitro and in vivo, and understand-

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    in vitro increased acetate production through RA. Such ex- periments in vivo are excluded however because introduction of frozen and thawed cattle hindgut contents to a sheep rumen did not affect rumen fermentation stoi- chiometry in vitro [5]. RA is a major characteristic of the cae- cal fermentation in young

  7. (81), ra39. [DOI: 10.1126/scisignal.2000316]2Science Signaling Pawson and Rune Linding (28 July 2009)

    E-Print Network [OSTI]

    (81), ra39. [DOI: 10.1126/scisignal.2000316]2Science Signaling Pawson and Rune Linding (28 July,5,6,7 Tony Pawson,1,2 Rune Linding8 (Published 28 July 2009; Volume 2 Issue 81 ra39) Protein kinases enable

  8. RaPID: THE END OF HEURISTIC PID TUNING Peter Van Overschee, Christiaan Moons, Wim Van Brempt

    E-Print Network [OSTI]

    RaPID: THE END OF HEURISTIC PID TUNING Peter Van Overschee, Christiaan Moons, Wim Van Brempt Paul Vanvuchelen, Bart De Moor Abstract: RaPID (Robust Advanced PID Control) is a new and original engineer- ing tool for the design and implementation of optimal PID controllers. It integrates data acquisition

  9. Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses

    E-Print Network [OSTI]

    Zheng, Yufeng

    Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

  10. A New Environmentally Friendly AL/ZR-Based Clay Stabilizer

    E-Print Network [OSTI]

    El-Monier, Ilham Abdallah

    2013-01-18T23:59:59.000Z

    Clay stabilizers are means to prevent fines migration and clay swelling, which are caused by the contact of formation with low salinity or high pH brines at high temperature. Previous clay stabilizers including: Al and Zr compounds and cationic...

  11. Antiferromagnetism of perovskite EuZrO{sub 3}

    SciTech Connect (OSTI)

    Zong Yanhua [Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan); Fujita, Koji, E-mail: fujita@dipole7.kuic.kyoto-u.ac.j [Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan); Akamatsu, Hirofumi; Murai, Shunsuke; Tanaka, Katsuhisa [Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)

    2010-01-15T23:59:59.000Z

    Polycrystalline EuZrO{sub 3} has been synthesized by the solid-state reaction between EuO and ZrO{sub 2}, and its structural and magnetic properties have been investigated. Rietveld analysis of the X-ray diffraction pattern indicates that EuZrO{sub 3} crystallizes in an orthorhombic perovskite structure. {sup 151}Eu Moessbauer effect measurement reveals that almost all the europium ions are present as the divalent state and occupy distorted sites with non-axial electric field gradients, in agreement with the orthorhombic structure. In contrast to previous reports, an antiferromagnetic transition was observed around 4.1 K. The magnetic structure below the Neel temperature has been discussed. - Graphical abstract: Perovskite EuZrO{sub 3} with almost all Eu ions present as Eu{sup 2+} has been synthesized and its structure and magnetic properties have been studied. An antiferromagnetic transition was observed around 4.1 K for the first time. The mechanism of the magnetic transition has been discussed.

  12. Evidence of Eu{sup 2+} 4f electrons in the valence band spectra of EuTiO{sub 3} and EuZrO{sub 3}

    SciTech Connect (OSTI)

    Kolodiazhnyi, T. [National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Valant, M. [Materials Research Laboratory, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica (Slovenia); Williams, J. R. [International Center for Young Scientists (ICYS), MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Bugnet, M.; Botton, G. A. [Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7 (Canada); Ohashi, N. [International Center for Materials Nanoarchitectonics, MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Sakka, Y. [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)

    2012-10-15T23:59:59.000Z

    We report on optical band gap and valence electronic structure of two Eu{sup 2+}-based perovskites, EuTiO{sub 3} and EuZrO{sub 3} as revealed by diffuse optical scattering, electron energy loss spectroscopy, and valence-band x-ray photoelectron spectroscopy. The data show good agreement with the first-principles studies in which the top of the valence band structure is formed by the narrow Eu 4f{sup 7} electron band. The O 2p band shows the features similar to those of the Ba(Sr)TiO{sub 3} perovskites except that it is shifted to higher binding energies. Appearance of the Eu{sup 2+} 4f{sup 7} band is a reason for narrowing of the optical band gap in the title compounds as compared to their Sr-based analogues.

  13. Point defect energetics in the ZrNi and Zr2Ni intermetallics C.S. Moura a,b

    E-Print Network [OSTI]

    Motta, Arthur T.

    and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA c Materials Science-neighbor Zr atoms. Ã? 2001 Elsevier Science B.V. All rights reserved. 1. Introduction There has been great of these compounds is governed by the balance between the irradiation damage and the annealing response

  14. Crystallization of Zr2PdxCu(1-x) and Zr2NixCu(1-x) Metallic Glass

    SciTech Connect (OSTI)

    Min Xu

    2008-08-18T23:59:59.000Z

    One interesting aspect of rretallic glasses is the numerous instances of the deviation of the phase selection from the amorphous state to thermodynamically stable phases during the crystallization process. Their devitrification pathways allow us to study the relationship between the original amorphous structure and their crystalline counter parts. Among the various factors of phase selections, size and electronic effects have been most extensively studied. Elucidating the phase selection process of a glassy alloy will be helpful to fill in the puzzle of the changes from disordered to ordered structures. In this thesis, Two model Zr{sub 2}Pd{sub x}Cu{sub (1-x)} and Zr{sub 2}Ni{sub x}Cu{sub (1-x)} (x = 0, 0.25, 0.5, 0.75 and 1) glassy systems were investigated since: (1) All of the samples can be made into a homogenous metallic glass; (2) The atomic radii differ from Pd to Cu is by 11%, while Ni has nearly the identical atomic size compare to Cu. Moreover, Pd and Ni differ by only one valence electron from Cu. Thus, these systems are ideal to test the idea of the effects of electronic structure and size factors; (3) The small number of components in these pseudo binary systems readily lend themselves to theoretical modeling. Using high temperature X-ray diffraction {HTXRD) and thermal analysis, topological, size, electronic, bond and chemical distribution factors on crystallization selections in Zr{sub 2}Pd{sub x}Cu{sub (1-x)} and Zr{sub 2}Ni{sub x}Cu{sub (1-x)} metallic glass have been explored. All Zr{sub 2}Pd{sub x}Cu{sub (1-x)} compositions share the same Cu11b phase with different pathways of meta-stable, icosahedral quasicrystalline phase (i-phase), and C16 phase formations. The quasicrystal phase formation is topologically related to the increasing icosahedral short range order (SRO) with Pd content in Zr{sub 2}Pd{sub x}Cu{sub (1·x)} system. Meta-stable C16 phase is competitive with C11b phase at x = 0.5, which is dominated by electronic structure rather than size effects. Cu-rich and Ni-rich compositions in Zr{sub 2}Ni{sub x}Cu{sub (1-x)} trend to divitrify to C11b or C16 phases respectively. In the proposed pseudo binary phase diagram, the domain of C16, C11b and co-existence phases are mainly related with the topology in the amorphous structure and formation enthalpies of crystalline phases.

  15. Precipitation in cold-rolled Al–Sc–Zr and Al–Mn–Sc–Zr alloys prepared by powder metallurgy

    SciTech Connect (OSTI)

    Vlach, M., E-mail: martin.vlach@mff.cuni.cz [Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, CZ-121 16 Prague (Czech Republic); Stulikova, I.; Smola, B.; Kekule, T.; Kudrnova, H.; Danis, S. [Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 3, CZ-121 16 Prague (Czech Republic); Gemma, R. [King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, 23955-6900 Thuwal (Saudi Arabia); Ocenasek, V. [SVÚM a.s., Podnikatelská 565, CZ-190 11 Prague (Czech Republic); Malek, J. [Czech Technical University in Prague, Faculty of Mechanical Engineering, CZ-120 00 Prague (Czech Republic); Tanprayoon, D.; Neubert, V. [Institut für Materialprüfung und Werkstofftechnik, Freiberger Strasse 1, D-38678 Clausthal-Zellerfeld (Germany)

    2013-12-15T23:59:59.000Z

    The effects of cold-rolling on thermal, mechanical and electrical properties, microstructure and recrystallization behaviour of the AlScZr and AlMnScZr alloys prepared by powder metallurgy were studied. The powder was produced by atomising in argon with 1% oxygen and then consolidated by hot extrusion at 350 °C. The electrical resistometry and microhardness together with differential scanning calorimetry measurements were compared with microstructure development observed by transmission and scanning electron microscopy, X-ray diffraction and electron backscatter diffraction. Fine (sub)grain structure developed and fine coherent Al{sub 3}Sc and/or Al{sub 3}(Sc,Zr) particles precipitated during extrusion at 350 °C in the alloys studied. Additional precipitation of the Al{sub 3}Sc and/or Al{sub 3}(Sc,Zr) particles and/or their coarsening was slightly facilitated by the previous cold rolling. The presence of Sc,Zr-containing particles has a significant antirecrystallization effect that prevents recrystallization at temperatures minimally up to 420 °C. The precipitation of the Al{sub 6}Mn- and/or Al{sub 6}(Mn,Fe) particles of a size ? 1.0 ?m at subgrain boundaries has also an essential antirecrystallization effect and totally suppresses recrystallization during 32 h long annealing at 550 °C. The texture development of the alloys seems to be affected by high solid solution strengthening by Mn. The precipitation of the Mn-containing alloy is highly enhanced by a cold rolling. The apparent activation energy of the Al{sub 3}Sc particles formation and/or coarsening and that of the Al{sub 6}Mn and/or Al{sub 6}(Mn,Fe) particle precipitation in the powder and in the compacted alloys were determined. The cold deformation has no effect on the apparent activation energy values of the Al{sub 3}Sc-phase and the Al{sub 6}Mn-phase precipitation. - Highlights: • The Mn, Sc and Zr additions to Al totally suppresses recrystallization at 550 °C. • The Sc,Zr-containing particle precipitation is slightly facilitated by cold rolling. • The Mn-containing particle precipitation is highly enhanced by cold rolling. • Cold rolling has no effect on activation energy of the Al{sub 3}Sc and Al{sub 6}Mn precipitation. • The texture development is affected by high solid solution strengthening by Mn.

  16. Targeting of Osseous Sites with Alpha-emitting Ra-223: Comparison with the Beta-emitter Sr-89 in Mice

    SciTech Connect (OSTI)

    Henriksen, Gjermund; Fisher, Darrell R.; Roeske, John C.; Bruland, Oyvind S.; Larsen, Roy H.

    2003-05-16T23:59:59.000Z

    The bone-seeking property of and the potential to irradiate red marrow by the alpha-particle emitter Ra-223 (t1/2 = 11.43 d) were compared to those of the beta-emitter Sr-89 (t1/2 = 50.53 d). Methods: The biodistributions of Ra-223 and Sr-89 were studied in mice. Tissue uptakes were determined at 1 h, 6 h, 1 d, 3 d, and 14 d after intravenous administration. The potential redistribution of progeny from Ra-223 located in bone was investigated. Radiation absorbed doses were calculated for soft tissues and bone. Doses were also estimated for marrow-containing cavities assuming spheric geometries. Results: We found that both Sr-89 and Ra-223 selectively concentrated on bone surfaces relative to soft tissues. The measured bone uptake of Ra-223 was slightly higher than that of Sr-89. At the 24 h time-point, the femur uptake of Ra-223 was 40.1% of the administered activity per gram tissue. The uptake in spleen and most other soft tissues was higher for Ra-223 than for Sr-89. We observed rapid clearance of Ra-223 from soft tissues within the first 24 hours, but the bone surface uptake of Ra-223 increased with time up to 24 h. Among the soft tissues, the spleen had the greatest accumulation and retention of Ra-223. The femur-to-spleen ratio increased with time, from 6.4 at 6 h to 23.7 at 3 days after injections. We found little redistribution of Ra-223 daughter products away from bone (about 2% at 6 h and less than 1% detectable at 3 d). Estimates of dose to marrow-containing cavities showed that the Ra-223 alpha-emitter might have a marrow-sparing advantage compared to beta-emitters due to high linear-energy-transfer and short alpha range targeting osteoid surfaces. The alpha-emitters irradiate a smaller fraction of the marrow-containing volumes--sparing marrow and enhancing survival of marrow cells. At the same time, the bone surfaces receives a therapeutically effective radiation dose. Conclusion: The results of this study indicate that Ra-223 is a promising candidate for high linear-energy-transfer alpha-particle irradiation of cancer cells on bone surfaces. Radium-223 can, together with its daughter radionuclides, deliver an intense and highly localized field of radiation to bone surfaces with substantially less irradiation of healthy bone marrow dose compared to standard, bone-seeking beta-emitters such as Sr-89.

  17. 225-Ac and 223-Ra Production via 800 MeV Proton Irradiation of Natural Thorium Target

    E-Print Network [OSTI]

    J. W. Weidner; S. G. Mashnik; K. D. John; B. Ballard; E. R. Birnbaum; L. J. Bitteker; A. Couture; M. E. Fassbender; G. S. Goff; R. Gritzo; F. M. Hemez; W. Runde; J. L. Ullmann; L. E. Wolfsberg; F. M. Nortier

    2012-04-10T23:59:59.000Z

    Cross sections for the formation of 225,227-Ac, 223,225-Ra, and 227-Th via the proton bombardment of natural thorium targets were measured at a nominal proton energy of 800 MeV. No earlier experimental cross section data for the production of 223,225-Ra, 227-Ac and 227-Th by this method were found in the literature. A comparison of theoretical predictions with the experimental data shows agreement within a factor of two. Results indicate that accelerator-based production of 225-Ac and 223-Ra is a viable production method.

  18. Roadmap: Paralegal Studies Bachelor of Arts [AS-BA-PLST

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Paralegal Studies ­ Bachelor of Arts [AS-BA-PLST] College of Arts and Sciences Department of Sociology Catalog Year: 2013-2014 Page 1 of 3 | Last Updated: 7-May-13/LNHD This roadmap is a recommended on page 2 #12;Roadmap: Paralegal Studies ­ Bachelor of Arts [AS-BA-PLST] College of Arts and Sciences

  19. FourYear Academic Plan 20122013 BA in Geology

    E-Print Network [OSTI]

    FourYear Academic Plan 20122013 BA in Geology Internal Use Version Year 1 Year 2 Year 3 Year 4: Total UD Credits: 46 Total Credits: 120 3/19/12 #12;FourYear Academic Plan 20122013 BA in Geology

  20. Combined Honours BA Digital Journalism and Communication, Media, and Film

    E-Print Network [OSTI]

    Combined Honours BA Digital Journalism and Communication, Media, and Film Are you looking in Digital Journalism (DJ) and Communication, Media, and Film (CMF) is for you. That's because our DJ Honours BA Digital Journalism and Communication, Media, and Film We look forward to meeting you! Student

  1. Radioactive contamination of BaF2 crystal scintillator

    E-Print Network [OSTI]

    Polischuk, O G; Bernabei, R; Cappella, F; Caracciolo, V; Cerulli, R; Di Marco, A; Danevich, F A; Incicchitti, A; Poda, D V; Tretyak, V I

    2013-01-01T23:59:59.000Z

    Barium fluoride (BaF$_2$) crystal scintillators are promising detectors to search for double beta decay processes in $^{130}$Ba ($Q_{2{\\beta}}$ = 2619(3) keV) and $^{132}$Ba ($Q_{2{\\beta}}$ = 844(1) keV). The $^{130}$Ba isotope is of particular interest because of the indications on 2${\\beta}$ decay found in two geochemical experiments. The radioactive contamination of BaF$_2$ scintillation crystal with mass of 1.714 kg was measured over 113.4 hours in a low-background DAMA/R&D set-up deep underground (3600 m w.e.) at the Gran Sasso National Laboratories of INFN (LNGS, Italy). The half-life of $^{212}$Po (present in the crystal scintillator due to contamination by radium) was estimated as $T_{1/2}$ = 298.8 $\\pm$ 0.8(stat.) $\\pm$ 1.4(syst.) ns by analysis of the events pulse profiles.

  2. Model for Simulation of Hydride Precipitation in Zr-Based Used...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    model that accounts for (microstucture) grain texture and orientation, and includes free energy of two Zr phases. The chemical potential that drives the compositional and phase...

  3. Crystallization and glass formation in electron and laser beam irradiated Cu-Zr alloys

    SciTech Connect (OSTI)

    Huang, J.S.; Kaufmann, E.N.; Wall, M.A.; Olsen, B.L.

    1987-11-01T23:59:59.000Z

    Four Cu-Zr alloys, Cu/sub 56/Zr/sub 44/, Cu/sub 50/Zr/sub 50/, Cu/sub 47/Zr/sub 53/, and Cu/sub 33/Zr/sub 67/, were surface melted with electron and pulsed laser beams to compare their kinetics of nucleation, growth and glass formation. It was observed that the ease of glass formation increased in the order: Cu/sub 33/Zr/sub 67/, Cu/sub 47/Zr/sub 53/, Cu/sub 56/Zr/sub 44/, and Cu/sub 50/Zr/sub 50/. The nucleation and regrowth produced different metastable phases. At the equiatomic composition, the preferred phase is a CsCl-type (B2) BCC structure. As the composition deviates from this, the preferred phase is either orthorhombic or tetragonal with a much larger unit cell not previously reported in the literature. The maximum growth velocity of these metastable phases was found to be about 0.025 m/s. The slow kinetics are responsible for the ease of glass formation in these systems. 4 refs., 7 figs., 2 tabs.

  4. Identification of phases in the interaction layer between U-Mo-Zr/Al and U-Mo-Zr/Al-Si

    SciTech Connect (OSTI)

    Varela, C.L. Komar; Arico, S.F.; Mirandou, M.; Balart, S.N. [Departamento Materiales, GIDAT, GAEN, CNEA, Avda. Gral Paz 1499, B1650KNA, San Martin (Argentina); Gribaudo, L.M. [Departamento Materiales, GIDAT, GAEN, CNEA, Avda. Gral Paz 1499, B1650KNA, San Martin (Argentina); CONICET, Avda. Rivadavia 1917, C1033AAJ, Buenos Aires (Argentina)

    2008-07-15T23:59:59.000Z

    Out-of-pile diffusion experiments were performed between U-7wt.% Mo-1wt.% Zr and Al or Al A356 (7,1wt.% Si) at 550 deg. C. In this work morphological characterization and phase identification on both interaction layer are presented. They were carried out by the use of different techniques: optical and scanning electron microscopy, X-Ray diffraction and WDS microanalysis. In the interaction layer U-7wt.% Mo-1wt.% Zr/Al, the phases UAl{sub 3}, UAl{sub 4}, Al{sub 20}Mo{sub 2}U and Al{sub 43}Mo{sub 4}U{sub 6} were identified. In the interaction layer U-7wt.% Mo-1wt.% Zr/Al A356, the phases U(Al, Si) with 25at.% Si and Si{sub 5}U{sub 3} were identified. This last phase, with a higher Si concentration, was identified with XRD Synchrotron radiation performed at the National Synchrotron Light Laboratory (LNLS), Campinas, Brasil. (author)

  5. The interaction of NO2 with BaO: from cooperative adsorption...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    The interaction of NO2 with BaO: from cooperative adsorption to Ba(NO3)2 formation. The interaction of NO2 with BaO: from cooperative adsorption to Ba(NO3)2 formation. Abstract:...

  6. Water-induced Bulk Ba(NO3)2 Formation From NO2 Exposed Thermally...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Bulk Ba(NO3)2 Formation From NO2 Exposed Thermally Aged BaOAl2O3. Water-induced Bulk Ba(NO3)2 Formation From NO2 Exposed Thermally Aged BaOAl2O3. Abstract: Phase changes in high...

  7. Examination Report: OAS-RA-L-12-07 | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T,OfficeEnd of Year 2010Salt | DepartmentExamination Report: OAS-RA-L-12-07

  8. Audit Report: OAS-RA-10-17 | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s ReplyApplication of TrainingAMOIG-074310-17 Audit Report: OAS-RA-10-17

  9. Audit Report: OAS-RA-12-06 | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s ReplyApplication of TrainingAMOIG-074310-17 Audit Report:OAS-RA-12-06

  10. Audit Report: OAS-RA-L-11-08 | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s ReplyApplication of TrainingAMOIG-074310-17 Audit Report:OAS-RA-12-068

  11. Audit Report: OAS-RA-L-11-09 | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s ReplyApplication of TrainingAMOIG-074310-17 Audit Report:OAS-RA-12-0689

  12. Audit Report: OAS-RA-10-08 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 Audit Report: OAS-M-15-03RA-10-08

  13. Audit Report: OAS-RA-11-02 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 Audit Report:OAS-RA-11-02 Audit

  14. Audit Report: OAS-RA-11-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 Audit Report:OAS-RA-11-02

  15. Audit Report: OAS-RA-11-11 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 AuditAudit Report: OAS-RA-11-11

  16. Audit Report: OAS-RA-11-12 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 AuditAudit Report: OAS-RA-11-112

  17. Audit Report: OAS-RA-11-13 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 AuditAudit Report: OAS-RA-11-1123

  18. Audit Report: OAS-RA-L-11-02 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03 AuditAuditReport: OAS-RA-L-11-02

  19. Audit Report: OAS-RA-L-12-06 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments from TarasaName4 AuditM-15-03RA-L-12-06 Audit Report:

  20. Examination Report: OAS-RA-11-18 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:RevisedAdvisoryStandardGeneration |10Examination Report: OAS-RA-11-18 Examination

  1. Examination Report: OAS-RA-13-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:RevisedAdvisoryStandardGeneration |10Examination Report: OAS-RA-11-18Examination

  2. Audit Report: OAS-RA-14-04 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube platform is alwaysISOSource1-01 Audit Letter Report:3894 Audit4RA-14-04 Audit

  3. Audit Report: OAS-RA-L-12-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube platform is alwaysISOSource1-01 Audit Letter Report:3894 Audit4RA-14-046033

  4. Audit Report: OAS-RA-L-12-06 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube platform is alwaysISOSource1-01 Audit Letter Report:3894 Audit4RA-14-046033456

  5. Special Report: OAS-RA-10-04 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo »UsageSecretaryVideos Solid-State|Special Report: OAS-RA-10-04 Special

  6. Special Report: OAS-RA-12-03 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo »UsageSecretaryVideos Solid-State|Special Report: OAS-RA-10-04

  7. Special Report: OAS-RA-13-10 | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo »UsageSecretaryVideos Solid-State|Special Report: OAS-RA-10-04Special

  8. Microstructure and Cs Behavior of Ba-Doped Aluminosilicate Pollucite...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    its environmental impact. Aluminosilicate pollucite CsAlSi2O6 is selected as a model waste form to study the decay-induced structural effects. While Ba-containing precipitates...

  9. High temperature ablation resistance of ZrNp reinforced W matrix composites

    E-Print Network [OSTI]

    Hong, Soon Hyung

    High temperature ablation resistance of ZrNp reinforced W matrix composites Malik Adeel Umer October 2013 Keywords: Metal-matrix composites (MMCs) Powder metallurgy Oxidation Scanning electron-based materials, a new class of composites was fabricated using particulate ZrN as reinforcement. The high

  10. Densification and microstructure development in spark plasma sintered WC6 wt% ZrO2 nanocomposites

    E-Print Network [OSTI]

    Srivastava, Kumar Vaibhav

    Densification and microstructure development in spark plasma sintered WC­6 wt% ZrO2 nanocomposites nanocomposite, spark plasma sintered at 1300 °C, for varying times of up to 20 min. The primary aim of this work investigation indicated that ZrO2 in the spark plasma sintered nanocomposite adopted an orthorhombic crystal

  11. Thermoelectric Transport in a ZrN/ScN Superlattice MONA ZEBARJADI,1

    E-Print Network [OSTI]

    Thermoelectric Transport in a ZrN/ScN Superlattice MONA ZEBARJADI,1 ZHIXI BIAN,1 RAJEEV SINGH,1 ALI for a high thermoelectric figure of merit. The thermopower of these structures can be enhanced by controlling and experimental studies of the thermoelectric transport in ZrN/ScN metal/semiconductor superlattices. Preliminary

  12. Atomistic Studies of Cation Transport in Tetragonal ZrO2 During Zirconium Corrosion

    SciTech Connect (OSTI)

    Xian-Ming Bai; Yongfeng Zhang; Michael R. Tonks

    2013-10-01T23:59:59.000Z

    Zirconium alloys are the major fuel cladding materials in current reactors. The water-side corrosion is one of the major degradation mechanisms of these alloys. During corrosion the transport of oxidizing species in zirconium dioxide (ZrO2) determines the corrosion kinetics. Previously it has been argued that the outward diffusion of cation ions is important for forming protective oxides. In this work, the migration of Zr defects in tetragonal ZrO2 is studied with temperature accelerated dynamics and molecular dynamics simulations. The results show that Zr interstitials have anisotropic diffusion and migrate preferentially along the [001] or c direction in tetragonal ZrO2. The compressive stresses can increase the Zr interstitial migration barrier significantly. The migration barriers of some defect clusters can be much lower than those of point defects. The migration of Zr interstitials at some special grain boundaries is much slower than in a bulk oxide. The implications of these atomistic simulation results in the Zr corrosion are discussed.

  13. Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy

    E-Print Network [OSTI]

    Pennycook, Steve

    Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy C.T. Liu*, M composition Zr­10 at.%Al­5% Ti­17.9% Cu­14.6% Ni (BAM-11) was used to study the effects of oxygen impurities and microalloying on the microstructure and mechanical properties. Oxygen impurity at a level of 3000 appm

  14. Isoscalar Breathing Mode State in Zr-90 and Sn-116

    E-Print Network [OSTI]

    Rozsa, C. M.; Youngblood, David H.; Bronson, J. D.; Lui, YW; Garg, U.

    1980-01-01T23:59:59.000Z

    PHYSICAL RKVIK% C VOLUIHE 21, NUMBER 4 Isoscalar breathing mode state in Zr and "Sn C. M. Rozsa, D. H. Youngblood, J. D. Bronson, Y.-%. Lui, and U. Garg Cyclotron Institute, Texas AckM University, College Station, Texas 77843 (Received 5..., BRONSON, LUI, AND GARG larger opening and served to catch some particles scattered from the first set. For measurements at 0', the beam was passed into the spectrograph and one set of brass defining slits with an open- ing of 6.4' horizontally by 3.V...

  15. Report on Characterization of U-10 wt.% Zr Alloy

    SciTech Connect (OSTI)

    McKeown, J; Wall, M; Hsiung, L; Turchi, P

    2012-03-01T23:59:59.000Z

    This report summarizes the chemical and structural characterization results for a U-10 wt.% Zr alloy to be used in an ultra-high burn-up nuclear fuel concept. The as-cast alloy material was received from Texas A and M University. Characterization and an initial heat treatment of the alloy material were conducted at Lawrence Livermore National Laboratory. The as-received ingot was sectioned for X-ray analysis, metallography, SEM, TEM, and heat treatments, as shown in Figure 1.

  16. Shape co-existence and parity doublet in Zr isotopes

    E-Print Network [OSTI]

    Bharat Kumar

    2014-12-05T23:59:59.000Z

    We studied the ground and excited states properties for Zr isotopes starting^M from proton to neutron drip-lines using the relativistic and non-relativistic mean field formalisms with BCS and Bogolyubov pairing. The celebrity NL3 and SLy4 parameter sets are used in the calculations. We find spherical ground and low-lying^M superdeformed excited states in most of the isotopes. Several couples of^M $\\Omega^{\\pi}=1/2^{\\pm}$ parity doublets configurations are found,^M while analyzing the single-particle energy levels of the superdeformed ^M configurations.

  17. Rapid Reagentless Detection of M. tuberculosis H37Ra in Respiratory Effluents

    SciTech Connect (OSTI)

    Adams, K L; Steele, P T; Bogan, M J; Sadler, N M; Martin, S; Martin, A N; Frank, M

    2008-01-29T23:59:59.000Z

    Two similar mycobacteria, Mycobacteria tuberculosis H37Ra and Mycobacteria smegmatis are rapidly detected and identified within samples containing a complex background of respiratory effluents using Single Particle Aerosol Mass Spectrometry (SPAMS). M. tuberculosis H37Ra (TBa), an avirulent strain, is used as a surrogate for virulent tuberculosis (TBv); M. smegmatis (MSm) is utilized as a near neighbor confounder for TBa. Bovine lung surfactant and human exhaled breath condensate are used as first-order surrogates for infected human lung expirations from patients with pulmonary tuberculosis. This simulated background sputum is mixed with TBa or MSm and nebulized to produce conglomerate aerosol particles, single particles that contain a bacterium embedded within a background respiratory matrix. Mass spectra of single conglomerate particles exhibit ions associated with both respiratory effluents and mycobacteria. Spectral features distinguishing TBa from MSm in pure and conglomerate particles are shown. SPAMS pattern matching alarm algorithms are able to distinguish TBa containing particles from background matrix and MSm for >50% of the test particles, which is sufficient to enable a high probability of detection and a low false alarm rate if an adequate number of such particles are present. These results indicate the potential usefulness of SPAMS for rapid, reagentless tuberculosis screening.

  18. Magnetic properties of Co-Zr-B magnets produced by spark plasma sintering method

    SciTech Connect (OSTI)

    Saito, Tetsuji, E-mail: tetsuji.saito@it-chiba.ac.jp; Akiyama, Tomoya [Department of Mechanical Science and Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016 (Japan)

    2014-05-07T23:59:59.000Z

    Magnets of Co-Zr-B, one of the permanent magnetic compounds without rare-earth elements, were successfully produced by the spark plasma sintering method. The resultant Co-Zr-B magnets had high densities of 92%–96% and consisted mainly of the Co{sub x}Zr (x ? 5) phase. The coercivity of the Co-Zr-B magnets was highly dependent on the consolidation temperature and the boron content. The highest maximum energy product of 6.0 MGOe, with a remanence of 6.4 kG and the coercivity of 4.0 kOe, was achieved by the Co{sub 80}Zr{sub 18}B{sub 2} magnets consolidated at 873?K.

  19. Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

    E-Print Network [OSTI]

    Zhao, Xin; Nguyen, Manh Cuong; Wang, Cai-Zhuang; Ho, Kai-Ming

    2015-01-01T23:59:59.000Z

    The structures and magnetic properties of the Co-Zr-B alloys near the Co5Zr composition were studied using adaptive genetic algorithm and first-principles calculations to guide further experimental effort on optimizing their magnetic performances. Through extensive structural searches, we constructed the contour maps of the energetics and magnetic moments of the Co-Zr-B magnet alloys as a function of composition. We found that the Co-Zr-B system exhibits the same structural motif as the "Co11Zr2" polymorphs, which plays a key role in achieving high coercivity. Boron atoms can either substitute selective cobalt atoms or occupy the interstitial sites. First-principles calculation shows that the magnetocrystalline anisotropy energies can be significantly improved through proper boron doping.

  20. Page 1 | B.A. in Art History | Academic Plan of Study Updated March 2014 B.A. in Art History

    E-Print Network [OSTI]

    Raja, Anita

    Coordinator: Dr. James Frakes (Rowe 218, jffrakes@uncc.edu, 704-687-0182). PROGRAM REQUIREMENTS BA in Art

  1. Page 1 | B.A. in Middle Grades Education | Academic Plan of Study Updated March 2014 B.A. in Middle Grades Education

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Middle Grades Education | Academic Plan of Study Updated March 2014 B.A. in Middle 2 | B.A. in Middle Grades Education | Academic Plan of Study Updated March 2014 Middle Grades Grades Education Academic Plan of Study College of Education Department of Middle, Secondary and K-12

  2. Isothermal oxidation behavior of ternary Zr-Nb-Y alloys at high temperature

    SciTech Connect (OSTI)

    Prajitno, Djoko Hadi, E-mail: djokohp@batan.go.id [Research Center for Nuclear Materials and Radiometry, Jl. Tamansari 71, Bandung 40132 (Indonesia); Soepriyanto, Syoni; Basuki, Eddy Agus [Metallurgy Engineering, Institute Technology Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia); Wiryolukito, Slameto [Materials Engineering, Institute Technology Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

    2014-03-24T23:59:59.000Z

    The effect of yttrium content on isothermal oxidation behavior of Zr-2,5%Nb-0,5%Y, Zr-2,5%Nb-1%Y Zr-2,5%Nb-1,5%Y alloy at high temperature has been studied. High temperature oxidation carried out at tube furnace in air at 600,700 and 800°C for 1 hour. Optical microscope is used for microstructure characterization of the alloy. Oxidized and un oxidized specimen was characterized by x-ray diffraction. In this study, kinetic oxidation of Zr-2,5%Nb with different Y content at high temperature has also been studied. Characterization by optical microscope showed that microstructure of Zr-Nb-Y alloys relatively unchanged and showed equiaxed microstructure. X-ray diffraction of the alloys depicted that the oxide scale formed during oxidation of zirconium alloys is monoclinic ZrO2 while unoxidised alloy showed two phase ? and ? phase. SEM-EDS examination shows that depletion of Zr composition took place under the oxide layer. Kinetic rate of oxidation of zirconium alloy showed that increasing oxidation temperature will increase oxidation rate but increasing yttrium content in the alloys will decrease oxidation rate.

  3. Ab initio density functional theory study of uranium solubility in Gd2Zr2O7 pyrochlore

    E-Print Network [OSTI]

    Chen, Qing-yun; Meng, Chuan-min; Liao, Chang-zhong; Wang, Lie-lin; Xie, Hua; Lv, Hui-yi; Wu, Tao; Ji, Shi-yin; Huang, Yu-zhu

    2015-01-01T23:59:59.000Z

    In this study, an ab initio calculation is performed to investigate the uranium solubility in different sites of Gd2Zr2O7 pyrochlore. The Gd2Zr2O7 maintains its pyrochlore structure at low uranium dopant levels, and the lattice constants of Gd2(Zr2-yUy)O7 and (Gd2-yUy)Zr2O7 are generally expressed as being linearly related to the uranium content y. Uranium is found to be a preferable substitute for the B-site gadolinium atoms in cation-disordered Gd2Zr2O7 (where gadolinium and zirconium atoms are swapped) over the A-site gadolinium atoms in ordered Gd2Zr2O7 due to the lower total energy of (Gd2-yZry)(Zr2-yUy)O7. The theoretical findings present a reasonable explanation of recent experiment results.

  4. Diffusional Interactions between U-Mo and Zr at 650°C as a Function of Time

    SciTech Connect (OSTI)

    Y. Park; Y. H. Sohn; D. D. Keiser, Jr.

    2015-01-01T23:59:59.000Z

    Development of monolithic U-Mo alloy fuel (typically U-10wt.%Mo) for the Reduced Enrichment for Research and Test Reactors (RERTR) program requires a use of Zr diffusion barrier to eliminate the diffusional interaction between the fuel alloy and Al-alloy cladding. The application of Zr barrier to the U-Mo fuel requires co-rolling process that utilizes a soaking temperature of 650°C, which represents the highest temperature the fuel system is exposed to during both fuel manufacturing and reactor application. Therefore, in this study, development of phase constituents, microstructure and diffusion kinetics of U-10wt.%Mo and Zr was examined using solid-to-solid diffusion couples annealed at 650°C for 240, 480 and 720 hours. Diffusional interactions were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Within the diffusion zone, a single-phase layer of ß-Zr was observed along with a discontinuous layer of Mo2Zr at the interface between the terminal ?-U(Mo) alloy and ß-Zr. In the vicinity of Mo2Zr phase, islands of ß-U and a-Zr phases were also found. In addition, accicular a-Zr phases were observed within the ?-U(Mo). Growth rate of this diffuaional interaction layer was determined to be 8.76 x 10-15 m2/sec, however with an assumption of certain incubation period. Consistency in these observation along with concentration profiles and diffusion paths are presented and discussed with respect to the diffusion couple that was furnace-cooled, annealed at 700°C in our previous study, and isothermal ternary phase diagram at 700°C.

  5. Analyses of femtosecond laser ablation of Ti, Zr, Hf

    E-Print Network [OSTI]

    Grojo, D; Bruneau, S; Itina, T

    2003-01-01T23:59:59.000Z

    Femtosecond laser ablation of Ti, Zr and Hf has been investigated by means of in-situ plasma diagnostics. Fast plasma imaging with the aid of an intensified charged coupled device (ICCD) camera was used to characterise the plasma plume expansion on a nanosecond time scale. Time- and spaceresolved optical emission spectroscopy was employed to perform time-of-flight measurements of ions and neutral atoms. It is shown that two plasma components with different expansion velocities are generated by the ultra-short laser ablation process. The expansion behaviour of these two components has been analysed as a function of laser fluence and target material. The results are discussed in terms of mechanisms responsible for ultra-short laser ablation.

  6. Ternary ceramic alloys of Zr-Ce-Hf oxides

    DOE Patents [OSTI]

    Becher, P.F.; Funkenbusch, E.F.

    1990-11-20T23:59:59.000Z

    A ternary ceramic alloy is described which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce[sub x]Hf[sub y]Zr[sub 1[minus]x[minus]y]O[sub 2], is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites. 1 fig.

  7. Printing and Scanning Instructions Printing on Savin (reserved for Job Market/RA/TA print jobs ONLY)

    E-Print Network [OSTI]

    Niebur, Ernst

    1 Printing and Scanning Instructions Printing on Savin (reserved for Job Market/RA/TA print jobs, stapling, or three holes punch, you can find them under the "Layout" tab and "Advanced". #12;2 Scanning on Savin (NOTE: scanning is Free of Charge) A feature of the new copier is the option of using it to scan

  8. NIH eRA System xTrain Termination for Appointments Quick Reference 1 January 27, 2011

    E-Print Network [OSTI]

    Baker, Chris I.

    NIH eRA System xTrain Termination for Appointments Quick Reference 1 January 27, 2011 Powering the Advancement of Science xTrain Termination of Appointments Quick Reference Guide for Institution Users 1. The PD/PI Initiates a Termination Notice (TN) · The PD/PI locates the Trainee on the Trainee Roster

  9. NIH eRA System xTrain External Termination of Fellowships Quick Reference 1 January 27, 2011

    E-Print Network [OSTI]

    Baker, Chris I.

    NIH eRA System xTrain External Termination of Fellowships Quick Reference 1 January 27, 2011 Powering the Advancement of Science xTrain Termination of Fellowships Quick Reference Guide for Institution finds the Fellowship award to be terminated and selects the View Trainee Roster link. NOTE: Although

  10. Microfluidics for block polymer shells (DMR 0819860) SEED :H.A. Stone, R.A. Register and Janine Nunes

    E-Print Network [OSTI]

    Petta, Jason

    Microfluidics for block polymer shells (DMR 0819860) SEED :H.A. Stone, R.A. Register and Janine. We utilized microfluidic methods to investigate the role of geometric structures, e.g. thin spherical, microfluidic devices with two consecutive flow-focusing junctions were used to generate air bubble

  11. Howell, R.A., 2012 Living with a carbon allowance 1 Living with a carbon allowance: the experiences of Carbon

    E-Print Network [OSTI]

    Howell, R.A., 2012 Living with a carbon allowance 1 Living with a carbon allowance: the experiences of Carbon Rationing Action Groups and implications for policy Rachel A. Howell Environmental Change with a carbon allowance: the experiences of Carbon Rationing Action Groups and implications for policy. Energy

  12. 1997 BNL Site Environmental Report E -1 Bari, R.A., Gordon, D., Moran, D., and Volkow, N.,

    E-Print Network [OSTI]

    APPENDIX E 1997 BNL Site Environmental Report E - 1 Bari, R.A., Gordon, D., Moran, D., and Volkow, N., 1997. Report of the Ad Hoc Committee on Environmental, Safety, and Health Decision Making at Brookhaven National Laboratory (April 29, 1997). Brookhaven National Laboratory, 1997. Environmental

  13. An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo a

    E-Print Network [OSTI]

    Nimmo, Francis

    An experimental and numerical study of surface tension-driven melt flow R.A. Parsons a,, F. Nimmo 2007 Abstract To determine the role of surface tension-driven melt migration in planetary bodies, we, surface tension causes the melt to relax back to a homogeneous distribution. Samples composed of 76 vol

  14. Distributed Online Conditions Database of the BaBar Experiment

    SciTech Connect (OSTI)

    Khan, A.; /Brunel U.; Gaponenko, I.A.; Brown, D.N.; /LBL, Berkeley

    2011-11-21T23:59:59.000Z

    This paper presents CDB - The distributed Conditions Database of the BaBar Experiment. CDB is the second major iteration of the database deployed in BaBar for production use as of October 2002. It replaced the original version of the database used through the first three years of the data taking. The new design and its implementation aims to improve the performance and scalability of the original database and addresses the emerging challenges of the distributed data production and analysis system of the Experiment.

  15. Effect of BaO Morphology on NOx Abatement: NO Interaction with...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    as well as unsupported and ?-Al&8322;O&8323;-supported BaO clusters. Adsorption of NO&8322; over BaO of different morphologies studied with the same method allowed...

  16. Adsorption and Formation of BaO Overlayers on Gamma-Al2O3 Surfaces...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Formation of BaO Overlayers on Gamma-Al2O3 Surfaces . Adsorption and Formation of BaO Overlayers on Gamma-Al2O3 Surfaces . Abstract: First-principles density functional theory slab...

  17. The Effect of Water on the Adsorption of NO in Na- and Ba-Y,FAU...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Water on the Adsorption of NO in Na- and Ba-Y,FAU Zeolites: A Combined FTIR and TPD Investigation. The Effect of Water on the Adsorption of NO in Na- and Ba-Y,FAU Zeolites: A...

  18. NO2 Adsorption on BaO/Al2O3: The Nature of Nitrate Species. ...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    NO2 Adsorption on BaOAl2O3: The Nature of Nitrate Species. NO2 Adsorption on BaOAl2O3: The Nature of Nitrate Species. Abstract: The nature of nitrate species formed in the...

  19. NOx Uptake Mechanism on Pt/BaO/Al2O3 Catalysts. | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Al2O3 Catalysts. NOx Uptake Mechanism on PtBaOAl2O3 Catalysts. Abstract: The NOx adsorption mechanism on PtBaOAl2O3 catalysts was investigated by performing NOx storage...

  20. Evolution of ferroelectric domain structures embedded inside polychrystalline BaTiO3 during heating

    E-Print Network [OSTI]

    Varlioglu, Mesut

    2010-01-01T23:59:59.000Z

    Polycrystalline BaTiO 3 during Heating Mesut Varlioglu, 1under quasistatic heating by using polychromatic scanning X-180.47° or 0.47°. While heating the polycrystalline BaTiO 3

  1. Water-induced morphology changes in BaO/?-Al2O3 NOx storage...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    materials. Water-induced morphology changes in BaO?-Al2O3 NOx storage materials. Abstract: Exposure of NO2-saturated BaO?-Al2O3 NOx storage materials to H2O vapour...

  2. Separation of Zirconium from Uranium in U-Zr Alloys Using a Chlorination Process

    E-Print Network [OSTI]

    Parkison, Adam J

    2013-06-04T23:59:59.000Z

    The fundamental behavior underpinning a new processing concept was demonstrated which is capable of separating uranium from zirconium in U-Zr alloys through the formation and selective volatilization of their respective chlorides. Bench...

  3. Separation of Zirconium from Uranium in U-Zr Alloys Using a Chlorination Process 

    E-Print Network [OSTI]

    Parkison, Adam J

    2013-06-04T23:59:59.000Z

    The fundamental behavior underpinning a new processing concept was demonstrated which is capable of separating uranium from zirconium in U-Zr alloys through the formation and selective volatilization of their respective chlorides. Bench...

  4. Low beryllium content Zr-based bulk metallic glass composite with plasticity and work hardenability

    SciTech Connect (OSTI)

    Zheng, Q., E-mail: qiangzheng616@hotmail.com, E-mail: dujuan@nimte.ac.cn [School of Materials Science and Engineering, Ningbo University of Technology, Ningbo, 315016, China and Ningbo Branch of China Academy of Ordnance Science, Ningbo, 315103 (China); Du, J., E-mail: qiangzheng616@hotmail.com, E-mail: dujuan@nimte.ac.cn [Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, NIMTE, CAS, Ningbo 315201 (China)

    2014-01-28T23:59:59.000Z

    A modified Zr-based bulk metallic glass matrix composite Zr{sub 47.67}Cu{sub 40}Ti{sub 3.66}Ni{sub 2.66}Be{sub 6} has been produced by increasing the contents of elements of Zr and Cu with higher Poisson ratio and reducing the contents of Ti, Ni, and Be elements with lower Poisson ratio based on famous metallic glass former Vitreloy 1. A compressive yielding strength of 1804?MPa, fracture strength of 1938?MPa and 3.5% plastic strain was obtained for obtained metallic glass composite. Also, work-hardening behavior was observed during compressive experiment which was ascribed to the interaction of the in situ precipitated CuZr phase and shear bands.

  5. Atomistic Modeling of Displacement Cascades in La2Zr2O7 Pyrochlore...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    static calculations. Citation: Chartier A, C Meis, JP Crocombette, LR Corrales, and WJ Weber.2003."Atomistic Modeling of Displacement Cascades in La2Zr2O7 Pyrochlore."Physical...

  6. A DFT + U study of cerium solubility in LaZrO. | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    solution exhibits a reduced charge state. Citation: Wang XJ, HY Xiao, X Zu, and WJ Weber.2012."A DFT + U study of cerium solubility in La?Zr?O?."Journal of Nuclear Materials...

  7. Phase formation in Zr/Fe multilayers during Kr ion irradiation.

    SciTech Connect (OSTI)

    Motta, A. T.

    1998-01-29T23:59:59.000Z

    A detailed study has been conducted of the effect of Kr ion irradiation on phase formation in Zr-Fe metallic multilayers, using the Intermediate Voltage Electron Microscopy (IVEM) at Argonne National Laboratory. Metallic multilayers were prepared with different overall compositions (near 50-50 and Fe-rich), and with different wavelengths (repetition thicknesses). These samples were irradiated with 300 keV Kr ions at various temperatures to investigate the final products, as well as the kinetics of phase formation. For the shorter wavelength samples, the final product was in all cases an amorphous Zr-Fe phase, in combination with Fe, while specially for the larger wavelength samples, in the Fe-rich samples the intermetallic compounds ZrFe{sub 2} and Zr{sub 3}Fe were formed in addition to the amorphous phase. The dose to full reaction decreases with temperature, and with wavelength in a manner consistent with a diffusion-controlled reaction.

  8. Process and properties of electroless Ni-Cu-P-ZrO{sub 2} nanocomposite coatings

    SciTech Connect (OSTI)

    Ranganatha, S. [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India)] [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Venkatesha, T.V., E-mail: drtvvenkatesha@yahoo.co.uk [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Vathsala, K. [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)] [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)

    2012-03-15T23:59:59.000Z

    Highlights: Black-Right-Pointing-Pointer The Ni-P and Ni-P-Cu-ZrO{sub 2} coatings were produced by electroless technique. Black-Right-Pointing-Pointer The influence of copper and ZrO{sub 2} nanoparticles on Ni-P was studied. Black-Right-Pointing-Pointer Surface morphology, structure and electrochemical behavior were evaluated. Black-Right-Pointing-Pointer The Ni-Cu-P-ZrO{sub 2} and Ni-P-ZrO{sub 2} coatings are more resistant to corrosion than Ni-P. Black-Right-Pointing-Pointer Introduction of Cu and ZrO{sub 2} in the matrix aids to the enhancement of microhardness. -- Abstract: Electroless Ni-Cu-P-ZrO{sub 2} composite coating was successfully obtained on low carbon steel matrix by electroless plating technique. Coatings with different compositions were obtained by varying copper as ternary metal and nano sized zirconium oxide particles so as to obtain elevated corrosion resistant Ni-P coating. Microstructure, crystal structure and composition of deposits were analyzed by SEM, EDX and XRD techniques. The corrosion behavior of the deposits was studied by anodic polarization, Tafel plots and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. The ZrO{sub 2} incorporated Ni-P coating showed higher corrosion resistance than plain Ni-P. The introduction of copper metal into Ni-P-ZrO{sub 2} enhanced the protection ability against corrosion. The influence of copper metal and nanoparticles on microhardness of coatings was evaluated.

  9. Deposition and characterization of TiZrV-Pd thin films by dc magnetron sputtering

    E-Print Network [OSTI]

    Wang, Jie; Xu, Yan-Hui; Wei, Wei; Fan, Le; Pei, Xiang-Tao; Hong, Yuan-Zhi; Wang, Yong

    2015-01-01T23:59:59.000Z

    TiZrV film is mainly applied in the ultra-high vacuum pipe of storage ring. Thin film coatings of palladium which was added onto the TiZrV film to increase the service life of nonevaporable getters and enhance pumping speed for H2, was deposited on the inner face of stainless steel pipes by dc magnetron sputtering using argon gas as the sputtering gas. The TiZrV-Pd film properties were investigated by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and X-Ray Diffraction (XRD). The grain size of TiZrV and Pd film were about 0.42~1.3 nm and 8.5~18.25 nm respectively. It was found that the roughness of TiZrV films was small, about 2~4 nm, for Pd film it is large, about 17~19 nm. PP At. % of Pd in TiZrV/Pd films varied from 86.84 to 87.56 according to the XPS test results.

  10. Results from ORNL Characterization of Zr02-500-AK2 - Surrogate TRISO Material

    SciTech Connect (OSTI)

    Hunn, John D [ORNL; Kercher, Andrew K [ORNL

    2005-06-01T23:59:59.000Z

    This document is a compilation of the characterization data for the TRISO-coated surrogate particle batch designated ZrO2-500-AK2 that was produced at Oak Ridge National Laboratory (ORNL) as part of the Advanced Gas Reactor Fuel Development and Qualification (AGR) program. The ZrO2-500-AK2 material contains nominally 500 {micro}m kernels of yttria-stabilized zirconia (YSZ) coated with all TRISO layers (buffer, inner pyrocarbon, silicon carbide, and outer pyrocarbon). The ZrO2-500-AK2 material was created for: (1) irradiation testing in the High Flux Isotope Reactor (HFIR) and (2) limited dissemination to laboratories as deemed appropriate to the AGR program. This material was created midway into a TRISO fuel development program to accommodate a sudden opportunity to perform irradiation testing on surrogate material. While the layer deposition processes were chosen based on the best technical understanding at the time, technical progress at ORNL has led to an evolution in the perceived optimal deposition conditions since the createion of ZrO2-500-AK2. Thus, ZrO2-500-AK2 contains a reasonable TRISO microstructure, but does differ significanly from currently produced TRISO surrogates and fuel at ORNL. In this document, characterization data of the ZrO2-500-AK2 surrogate includes: size, shape, coating thickness, and density.

  11. Results from ORNL characterization of ZrO2-500-AK2 - surrogate TRISO material

    SciTech Connect (OSTI)

    Kercher, Andrew K [ORNL; Hunn, John D [ORNL

    2005-06-01T23:59:59.000Z

    This document is a compilation of the characterization data for the TRISO-coated surrogate particles designated ZrO2-500-AK2 that was produced at Oak Ridge National Laboratory (ORNL) as part of the Advanced Gas Reactor Fuel Development and Qualification (AGR) program. The ZrO2-500-AK2 material contains nominally 500 {micro}m kernels of yttria-stabilized zirconia (YSZ) coated with all TRISO layers (buffer, inner pyrocarbon, silicon carbide, and outer pyrocarbon). The ZrO2-500-AK2 material was created for: (1) irradiation testing in the High Flux Isotope Reactor (HFIR) and (2) limited dissemination to laboratories as deemed appropriate to the AGR program. This material was created midway into a TRISO fuel development program to accommodate a sudden opportunity to perform irradiation testing on surrogate material. While the layer deposition processes were chosen based on the best technical understanding at the time, technical progress at ORNL has led to an evolution in the perceived optimal deposition conditions since the creation of ZrO2-500-AK2. Thus, ZrO2-500-AK2 contains a reasonable TRISO microstructure, but does differ significantly from currently produced TRISO surrogates and fuel at ORNL. In this document, characterization data of the ZrO2-500-AK2 surrogate includes: size, shape, coating thickness, and density.

  12. Superconductivity in gallium-substituted Ba8Si46 clathrates

    E-Print Network [OSTI]

    Li, Yang; Zhang, Ruihong; Liu, Yang; Chen, Ning; Luo, Z. P.; Ma, Xingqiao; Cao, Guohui; Feng, Z. S.; Hu, Chia-Ren; Ross, Joseph H., Jr.

    2007-01-01T23:59:59.000Z

    superconductor, with an onset at T-C approximate to 3.3 K. For x=10 and higher, no superconductivity was observed down to T=1.8 K. This represents a strong suppression of superconductivity with increasing Ga content, compared to Ba8Si46 with T-C approximate to 8...

  13. Roadmap: Art History Bachelor of Arts [CA-BA-ARTH

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Art History ­ Bachelor of Arts [CA-BA-ARTH] College of the Arts School of Art Catalog Year: 2012­2013 Page 1 of 2 | Last Updated: 29-May-12/JS This roadmap is a recommended semester Elective (upper division) 3 Minor Requirements or General Electives 9 See note 2 on page 2 #12;Roadmap

  14. Roadmap: Art History Bachelor of Arts [CA-BA-ARTH

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Art History ­ Bachelor of Arts [CA-BA-ARTH] College of the Arts School of Art Catalog Year: 2013­2014 Page 1 of 2 | Last Updated: 30-Apr-13/JS This roadmap is a recommended semester Elective (upper division) 3 Minor Requirements or General Electives 9 See note 2 on page 2 #12;Roadmap

  15. Roadmap: Biology -Bachelor of Arts [AS-BA-BSCI

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Biology - Bachelor of Arts [AS-BA-BSCI] College of Arts and Sciences Department of Biological Sciences Catalog Year: 2012­2013 Page 1 of 3 | Last Updated: 2-May-12/LNHD This roadmap hours and minimum 42 upper- division credit hours #12;Roadmap: Biology - Bachelor of Arts [AS

  16. Roadmap: English Bachelor of Arts [AS-BA-ENG

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: English ­ Bachelor of Arts [AS-BA-ENG] College of Arts and Sciences Department of English Catalog Year: 2013-2014 Page 1 of 4 | Last Updated: 7-May-13/LNHD This roadmap is a recommended semester 5 on page 3 General Electives (upper division) 6 #12;Roadmap: English ­ Bachelor of Arts [AS

  17. Superconductivity in gallium-substituted Ba8Si46 clathrates 

    E-Print Network [OSTI]

    Li, Yang; Zhang, Ruihong; Liu, Yang; Chen, Ning; Luo, Z. P.; Ma, Xingqiao; Cao, Guohui; Feng, Z. S.; Hu, Chia-Ren; Ross, Joseph H., Jr.

    2007-01-01T23:59:59.000Z

    superconductor, with an onset at T-C approximate to 3.3 K. For x=10 and higher, no superconductivity was observed down to T=1.8 K. This represents a strong suppression of superconductivity with increasing Ga content, compared to Ba8Si46 with T-C approximate to 8...

  18. BA in ECONOMICS (736020) MAP Sheet Department of Economics

    E-Print Network [OSTI]

    Olsen Jr., Dan R.

    BA in ECONOMICS (736020) MAP Sheet Department of Economics For students entering the degree program The Economics Department requires a minimum of 21 hours in the major to be taken in residency at BYU courses: complete the following with a grade of C- or better: Econ 110* Economics Principles and Problems

  19. BA in ECONOMICS (736020) MAP Sheet Department of Economics

    E-Print Network [OSTI]

    Olsen Jr., Dan R.

    BA in ECONOMICS (736020) MAP Sheet Department of Economics For students entering the degree program from approved list from approved list Econ 110* from approved list personal choice The Economics: complete the following with a grade of C- or better: Econ 110* Economics Principles and Problems Econ 378

  20. Structural phase transitions in BaPrO{sub 3}

    SciTech Connect (OSTI)

    Saines, Paul J. [School of Chemistry, University of Sydney, Sydney, New South Wales 2006 (Australia); Kennedy, Brendan J. [School of Chemistry, University of Sydney, Sydney, New South Wales 2006 (Australia)], E-mail: b.kennedy@chem.usyd.edu.au; Smith, Ronald I. [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Harwell Science and Innovation Campus, Didcot OX11 0QX (United Kingdom)

    2009-04-02T23:59:59.000Z

    The crystal structures adopted by BaPrO{sub 3} at and above ambient temperature have been examined using a combination of synchrotron X-ray and neutron diffraction. BaPrO{sub 3} has been established to undergo a series of phase transitions from Pbnmorthorhombic{yields}Ibmmorthorhombic{yields}R3-bar crhombohedral{yields}Pm3-barm cubic. BaPrO{sub 3} is the second A{sup 2+}B{sup 4+}O{sub 3} perovskite found to adopt rhombohedral symmetry in preference to the I4/mcm tetragonal structure. Analysis of the octahedral tilting through the rhombohedral to cubic phase transition indicates that this transformation is continuous and tricritical in nature. The tricritical behaviour of this transition is likely to be a result of the competition between tetragonal and rhombohedral structures to be the preferred phase, with the rhombohedral symmetry adopted by BaPrO{sub 3} being stabilised by the unusually large B-site cation.

  1. MAJOR TO CAREER GUIDE B.A. Chemistry

    E-Print Network [OSTI]

    Walker, Lawrence R.

    MAJOR TO CAREER GUIDE B.A. Chemistry College of Sciences www.unlv.edu/chemistry Mission of the College of Sciences The College of Sciences offers programs in life sciences, chemistry, geoscience: 702-895-2077 Campus Location: MPE-A 130 www.unlv.edu/sciences/advising About the Chemistry Career

  2. Measurements of Form Factors with the BaBar Experiment

    SciTech Connect (OSTI)

    Li, Selina Z.; /SLAC

    2011-08-25T23:59:59.000Z

    Selected recent results on measurements of form factors by the BaBar Collaboration are reviewed, including e{sup +}e{sup -} {yields} {eta}{prime}{gamma}, leptonic and semileptonic charm decays from data collected at or near the {Upsilon}(4S) resonance.

  3. Combined Honours BA Digital Journalism and Communication, Media, and Film

    E-Print Network [OSTI]

    Combined Honours BA Digital Journalism and Communication, Media, and Film Are you looking in Digital Journalism (DJ) and Communication, Media, and Film (CMF) is for you. That's because our DJ for a career combining your interests in media with a practical skill-set? If so, the Combined Honours program

  4. BaBar Note 295 May 16th, 1996

    E-Print Network [OSTI]

    and cooling system. Three types of hybrid will be used in BaBar SVT, di ering in the number of chips from 10 generated on the hybrid. We have realized that lateral walls of the channel help the heat exchange between of the cooling system in keeping the front-end chips into their optimal working condition. Thermo

  5. Hysteretic electrical transport in BaTiO{sub 3}/Ba{sub 1?x}Sr{sub x}TiO{sub 3}/Ge heterostructures

    SciTech Connect (OSTI)

    Ngai, J. H.; Kumah, D. P.; Walker, F. J. [Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, 15 Prospect Street, New Haven, Connecticut 06520-8284 (United States); Ahn, C. H. [Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, 15 Prospect Street, New Haven, Connecticut 06520-8284 (United States); Department of Mechanical Engineering and Materials Science, Yale University, 10 Hillhouse Avenue, New Haven, Connecticut 06520-8267 (United States)

    2014-02-10T23:59:59.000Z

    We present electrical transport measurements of heterostructures comprised of BaTiO{sub 3} and Ba{sub 1?x}Sr{sub x}TiO{sub 3} epitaxially grown on Ge. Sr alloying imparts compressive strain to the BaTiO{sub 3}, which enables the thermal expansion mismatch between BaTiO{sub 3} and Ge to be overcome to achieve c-axis oriented growth. The conduction bands of BaTiO{sub 3} and Ba{sub 1?x}Sr{sub x}TiO{sub 3} are nearly aligned with the conduction band of Ge, which facilitates electron transport. Electrical transport measurements through the dielectric stack exhibit rectifying behavior and hysteresis, where the latter is consistent with ferroelectric switching.

  6. Determination of the direct double- ? -decay Q value of Zr 96 and atomic masses of Zr 90 - 92 , 94 , 96 and Mo 92 , 94 - 98 , 100

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Gulyuz, K.; Ariche, J.; Bollen, G.; Bustabad, S.; Eibach, M.; Izzo, C.; Novario, S. J.; Redshaw, M.; Ringle, R.; Sandler, R.; Schwarz, S.; Valverde, A. A.

    2015-05-01T23:59:59.000Z

    Experimental searches for neutrinoless double-? decay offer one of the best opportunities to look for physics beyond the standard model. Detecting this decay would confirm the Majorana nature of the neutrino, and a measurement of its half-life can be used to determine the absolute neutrino mass scale. Important to both tasks is an accurate knowledge of the Q value of the double-? decay. The LEBIT Penning trap mass spectrometer was used for the first direct experimental determination of the ??Zr double-? decay Q value: Q??=3355.85(15) keV. This value is nearly 7 keV larger than the 2012 Atomic Mass Evaluation [M. Wang et al., Chin. Phys. C 36, 1603 (2012)] value and one order of magnitude more precise. The 3-? shift is primarily due to a more accurate measurement of the ??Zr atomic mass: m(??Zr)=95.90827735(17) u. Using the new Q value, the 2???-decay matrix element, |M2?|, is calculated. Improved determinations of the atomic masses of all other zirconium (90-92,94,96Zr) and molybdenum (92,94-98,100Mo) isotopes using both ¹²C? and ??Rb as references are also reported.

  7. Optimization of a fluorine-free metal-organic deposition to fabricate BaZrO film on RABiTS substrates

    E-Print Network [OSTI]

    ] for CCs [3]. 1 Present address: Department of Physics and Astronomy, Texas A&M University, College Station and substrates used for other MOD YBCO film deposition techniques, so it is a potential alternative for scaling

  8. Proton-induced cross sections relevant to production of 225Ac and 223Ra in natural thorium targets below 200 MeV

    E-Print Network [OSTI]

    J. W. Weidner; S. G. Mashnik; K. D. John; F. Hemez; B. Ballard; H. Bach; E. R. Birnbaum; L. J. Bitteker; A. Couture; D. Dry; M. E. Fassbender; M. S. Gulley; K. R. Jackman; J. L. Ullmann; L. E. Wolfsberg; F. M. Nortier

    2012-05-15T23:59:59.000Z

    Cross sections for 223,225Ra, 225Ac and 227Th production by the proton bombardment of natural thorium targets were measured at proton energies below 200 MeV. Our measurements are in good agreement with previously published data and offer a complete excitation function for 223,225Ra in the energy range above 90 MeV. Comparison of theoretical predictions with the experimental data shows reasonable-to-good agreement. Results indicate that accelerator-based production of 225Ac and 223Ra below 200 MeV is a viable production method.

  9. In-Situ Control of BaZrO3 and BaSnO3 Nanorod Alignment and Microstructure in YBa2Cu3O7-x Thin Films by Strain Modulated Growth

    E-Print Network [OSTI]

    Baca, Francisco Javier A.

    2009-11-20T23:59:59.000Z

    With the ability to carry very high electrical currents per unit area in kilometer length wires, high temperature superconductors (HTS) are especially promising candidates for applications where size and weight constraints ...

  10. Melting temperatures of the ZrO{sub 2}-MOX system

    SciTech Connect (OSTI)

    Uchida, T.; Hirooka, S.; Kato, M.; Morimoto, K. [Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194 (Japan); Sugata, H.; Shibata, K.; Sato, D. [Inspection Development Company, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1194 (Japan)

    2013-07-01T23:59:59.000Z

    Severe accidents occurred at the Fukushima Daiichi Nuclear Power Plant Units 1-3 on March 11, 2011. MOX fuels were loaded in the Unit 3. For the thermal analysis of the severe accident, melting temperature and phase state of MOX corium were investigated. The simulated coriums were prepared from 4%Pu-containing MOX, 8%Pu-containing MOX and ZrO{sub 2}. Then X-ray diffraction, density and melting temperature measurements were carried out as a function of zirconium and plutonium contents. The cubic phase was observed in the 25%Zr-containing corium and the tetragonal phase was observed in the 50% and 75%Zr-containing coria. The lattice parameter and density monotonically changed with Pu content. Melting temperature increased with increasing Pu content; melting temperature were estimated to be 2932 K for 4%Pu MOX corium and 3012 K for 8%Pu MOX corium in the 25%ZrO{sub 2}-MOX system. The lowest melting temperature was observed for 50%Zr-containing corium. (authors)

  11. Page 1 | B.A. in Earth Sciences | Academic Plan of Study Updated March 2014 B.A. in Earth Sciences

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Earth Sciences | Academic Plan of Study Updated March 2014 B.A. in Earth Sciences Academic Plan of Study College of Liberal Arts & Sciences Department of Geography & Earth Sciences geoearth. · Minimum Grades/GPA: minimum GPA is 2.0 · Teacher Licensure: YES in Earth Sciences. Students preparing

  12. Page 1 | B.A. in Earth Sciences | Academic Plan of Study Updated April 2014 B.A. in Earth Sciences

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Earth Sciences | Academic Plan of Study Updated April 2014 B.A. in Earth Sciences Academic Plan of Study College of Liberal Arts & Sciences Department of Geography & Earth Sciences geoearth. · Minimum Grades/GPA: minimum GPA is 2.0 · Teacher Licensure: YES in Earth Sciences. Students preparing

  13. Page 1 | B.A. in Special Education General Curriculum | Academic Plan of Study Updated May 2014 B.A. in Special Education (General Curriculum)

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Special Education ­ General Curriculum | Academic Plan of Study Updated May 2014 B.A. in Special Education (General Curriculum) Academic Plan of Study College of Education Department of Special Education and Child Development http://spcd.uncc.edu/ PROGRAM SUMMARY · Credit Hours: 120 hours

  14. Page 1 | B.A. in Elementary Education | Academic Plan of Study Updated March 2014 B.A. in Elementary Education

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Elementary Education | Academic Plan of Study Updated March 2014 B.A. in Elementary Education Academic Plan of Study College of Education Department of Reading and Elementary Education education.uncc.edu/reel PROGRAM SUMMARY · Credit Hours: 120-121 · Concentrations: No · Declaring

  15. Structural and chemical characterization of BaTiO{sub 3} nanorods

    SciTech Connect (OSTI)

    Zagar, K.; Recnik, A.; Sturm, S. [Department for Nanostructured Materials, Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana (Slovenia)] [Department for Nanostructured Materials, Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana (Slovenia); Gajovic, A. [Molecular Physics Laboratory, Division of Materials Physics, Ruder Boskovic Institute, Bijenicka 54, HR-1002 Zagreb (Croatia)] [Molecular Physics Laboratory, Division of Materials Physics, Ruder Boskovic Institute, Bijenicka 54, HR-1002 Zagreb (Croatia); Ceh, M., E-mail: miran.ceh@ijs.si [Department for Nanostructured Materials, Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana (Slovenia)

    2011-03-15T23:59:59.000Z

    Research highlights: {yields} Polycrystalline BaTiO{sub 3} nanorods were synthesized with EPD into AAO templates. {yields} Nanorods are composed of crystalline, nanosized grains with pseudo-cubic structure. {yields} Integrowth of hexagonal BaTiO{sub 3} polymorph within pseudo-cubic structure was observed. -- Abstract: An electron-microscopy investigation was performed on BaTiO{sub 3} nanorods that were processed by sol-gel electrophoretic deposition (EPD) into anodic aluminium oxide (AAO) membranes. The BaTiO{sub 3} nanorods grown within the template membranes had diameters ranging from 150 to 200 nm, with an average length of 10-50 {mu}m. By using various electron-microscopy techniques we showed that the processed BaTiO{sub 3} nanorods were homogeneous in their chemical composition. The BaTiO{sub 3} nanorods were always polycrystalline and were composed of well-crystallized, defect-free, pseudo-cubic BaTiO{sub 3} grains, ranging from 10 to 30 nm. No intergranular phases were observed between the BaTiO{sub 3} grains. A low-temperature hexagonal polymorph that is coherently intergrown with the BaTiO{sub 3} perovskite matrix was also observed as a minor phase. When annealing the AAO templates containing the BaTiO{sub 3} sol in an oxygen atmosphere the presence of the hexagonal polymorph was diminished.

  16. Remarkable Strontium B-Site Occupancy in Ferroelectric Pb(Zr1-xTix)O3 Solid Solutions Doped with Cryolite-Type Strontium Niobate

    E-Print Network [OSTI]

    Feltz, A.; Schmidt-Winkel, P.; Schossman, M.; Booth, C.H.; Albering, J.

    2007-01-01T23:59:59.000Z

    contains Lead-Titanium-Zirconium Oxide of Specificstructure such as lead zirconium titanium oxide Pb(Zr,Ti)O 3

  17. Kinetic Modeling of the Effect of MAO/Zr Ratio and Chain Transfer to Aluminum in Zirconocene Catalyzed Propylene Polymerization

    E-Print Network [OSTI]

    Catalyzed Propylene Polymerization Bernabe Quevedo-Sanchez, Jessica F. Nimmons, E. Bryan Coughlin was developed to characterize metallocene-catalyzed propylene polymerization using two different catalyst systems: rac-Et(Ind)2ZrCl2/MAO (I/MAO) and rac-Et(4,7-Me2-1-Ind)2ZrCl2/MAO (II/MAO). Slurry propylene

  18. Precipitation and Thermal Fatigue in Ni-Ti-Zr Shape Memory Alloy Thin Films by Combinatorial nanoCalorimetry

    E-Print Network [OSTI]

    1 Precipitation and Thermal Fatigue in Ni-Ti-Zr Shape Memory Alloy Thin Films by Combinatorial nano Mongolia University of Technology Hohhot 010051, China Abstract: Thin-film samples of Ni-Ti-Zr shape memory the composition and the stress state of the shape memory phase. Thermal fatigue behavior, induced by thermal

  19. Creep strength of niobium alloys, Nb-1%Zr and PWC-11

    SciTech Connect (OSTI)

    Titran, R.H.

    1990-01-01T23:59:59.000Z

    A study is being conducted at NASA Lewis Research Center to determine the feasibility of using a carbide particle strengthened Nb-1% Zr base alloy to meet the anticipated temperature and creep resistance requirements of proposed near term space power systems. In order to provide information to aid in the determination of the suitability of the PWC-11 alloy as an alternative to Nb-1% Zr in space power systems this study investigated (1) the long-time high-vacuum creep behavior of the PWC-11 material and the Nb-1% Zr alloy, (2) the effect of prior stress-free thermal aging on this creep behavior, (3) the effect of electron beam (EB) welding on this creep behavior, and (4) the stability of creep strengthening carbide particles. 14 refs., 5 figs., 2 tabs.

  20. The transition from amorphous to crystalline in Al/Zr multilayers

    SciTech Connect (OSTI)

    Zhong Qi; Zhang Zhong; Ma Shuang; Qi Runze; Li Jia; Wang Zhanshan [MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering, Department of Physics, Tongji University, Shanghai 200092 (China); Le Guen, Karine; Andre, Jean-Michel; Jonnard, Philippe [Laboratoire de Chimie Physique - Matiere et Rayonnement, UPMC Univ. Paris 06, CNRS UMR 7614, 11 rue Pierre et Marie Curie, F-75231 Paris cedex 05 (France)

    2013-04-07T23:59:59.000Z

    The amorphous-to-crystalline transition in Al(1.0%wtSi)/Zr and Al(Pure)/Zr multilayers grown by direct-current magnetron sputtering system has been characterized over a range of Al layer thicknesses (1.0-5.0 nm) by using a series of complementary measurements including grazing incidence X-ray reflectometry, atomic force microscopy, X-ray diffraction, and high-resolution transmission electron microscopy. The Al layer thickness transition exhibits the Si doped in Al could not only disfavor the crystallization of Al but also influence the changing trends of surface roughness and diffraction peak position of phase Al<111>. An interesting feature of the presence of Si in Al layer is that Si could influence the transition process in Al(1%wtSi) layer, in which the critical thickness (1.6 nm) of Al(Pure) layer in Al(Pure)/Zr shifts to 1.8 nm of Al(1.0%wtSi) layer in Al(1.0%wtSi)/Zr multilayer. We also found that the Zr-on-Al interlayer is wider than the Al-on-Zr interlayer in both systems, and the Al layers do not have specific crystal orientation in the directions vertical to the layer from selected area electron diffraction patterns below the thickness (3.0 nm) of Al layers. Above the thickness (3.0 nm) of Al layers, the Al layers are highly oriented in Al<111>, so that the transformation from asymmetrical to symmetrical interlayers can be observed. Based on the analysis of all measurements, we build up a model with four steps, which could explain the Al layer thickness transition process in terms of a critical thickness for the nucleation of Al(Pure) and Al(1%wtSi) crystallites.

  1. High-Linear Energy Transfer Irradiation Targeted to Skeletal Metastases by the Alpha Emitter Ra-223: Adjuvant or Alternative to Conventional Modalities?

    SciTech Connect (OSTI)

    Bruland, Oyvind S.; Nilsson, Sten; Fisher, Darrell R.; Larsen, Roy H.

    2006-10-15T23:59:59.000Z

    The bone-seeking, alpha-particle emitting radiopharmaceutical Alpharadin, 223RaCl2 (t1/2 = 11.4 days) is under clinical development as a novel treatment for skeletal metastases from breast and prostate cancer. This paper summarizes the current status of preclinical and clinical research on 223RaCl2. Potential advantages of 223Ra to that of external beam irradiation or registered beta-emitting bone-seekers are discussed. Published data of 223Ra dosimetry in mice and a therapeutic study in a skeletal metastases model in nude rats have indicated significant therapeutic potential of bone-seeking alpha-emitters. This paper provides short-term and long-term results from the first clinical single dosage trial. We present data from a repeated dosage study of five consecutive injections of 50 kBq/kg bodyweight, once every third week, or two injections of 125 kBq/kg bodyweight, six weeks apart. Furthermore, preliminary results are given for a randomized phase II trial involving 64 patients with hormone-refractory prostate cancer and painful skeletal metastases who received four monthly injections of 223Ra or saline as an adjuvant to external beam radiotherapy. Also presented are preliminary dose estimates for 223Ra in humans. Results indicate that repeated dosing is feasible and that opportunities are available for combined treatment strategies.

  2. Ab initio study of radium monofluoride, RaF, as a candidate to search for P- and T,P- violation effects

    E-Print Network [OSTI]

    A. D. Kudashov; A. N. Petrov; L. V. Skripnikov; N. S. Mosyagin; T. A. Isaev; R. Berger; A. V. Titov

    2014-09-20T23:59:59.000Z

    Relativistic ab initio calculations have been performed to assess the suitability of RaF for experimental search of P- and T,P-violating interactions. The parameters of P- and T,P-odd terms of the spin-rotational Hamiltonian have been calculated for the ${^2}\\Sigma$ electronic ground state of RaF molecule. They include the parameter $W_a$, which is critical in experimental search for nuclear anapole moment and the parameters $W_d$ and $W_{\\rm SP}$ required to obtain restrictions on the electric dipole moment of the electron and T,P-odd scalar-pseudoscalar interactions, respectively. The parameter $X$ corresponding to the "volume effect" in the T,P$-$odd interaction of the $^{223}$Ra nuclear Schiff moment with electronic shells of RaF has also been computed. Spectroscopic and hyperfine structure constants for $^{223}$RaF and $^{223}$Ra$^+$ have been computed as well, demonstrating the accuracy of the methods employed.

  3. Band alignment between GaN and ZrO{sub 2} formed by atomic layer deposition

    SciTech Connect (OSTI)

    Ye, Gang; Wang, Hong, E-mail: ewanghong@ntu.edu.sg; Arulkumaran, Subramaniam; Ng, Geok Ing; Li, Yang; Ang, Kian Siong [Novitas, Nanoelectronics Center of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 (Singapore); Liu, Zhi Hong [Singapore-MIT Alliance for Research and Technology, 1 CREATE Way, Singapore 138602 (Singapore)

    2014-07-14T23:59:59.000Z

    The band alignment between Ga-face GaN and atomic-layer-deposited ZrO{sub 2} was investigated using X-ray photoelectron spectroscopy (XPS). The dependence of Ga 3d and Zr 3d core-level positions on the take-off angles indicated upward band bending at GaN surface and potential gradient in ZrO{sub 2} layer. Based on angle-resolved XPS measurements combined with numerical calculations, valence band discontinuity ?E{sub V} of 1?±?0.2?eV and conduction band discontinuity ?E{sub C} of 1.2?±?0.2?eV at ZrO{sub 2}/GaN interface were determined by taking GaN surface band bending and potential gradient in ZrO{sub 2} layer into account.

  4. Physical properties of epitaxial ZrN/MgO(001) layers grown by reactive magnetron sputtering

    SciTech Connect (OSTI)

    Mei, A. B.; Zhang, C.; Sardela, M.; Eckstein, J. N.; Rockett, A. [Departments of Materials Science, Physics, and the Materials Research Laboratory, University of Illinois, 104 South Goodwin, Urbana, Illinois 61801 (United States)] [Departments of Materials Science, Physics, and the Materials Research Laboratory, University of Illinois, 104 South Goodwin, Urbana, Illinois 61801 (United States); Howe, B. M. [Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio 45433-7817 (United States)] [Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio 45433-7817 (United States); Hultman, L. [Thin Film Physics Division, Department of Physics (IFM), Linköping University, SE-58183 Linköping (Sweden)] [Thin Film Physics Division, Department of Physics (IFM), Linköping University, SE-58183 Linköping (Sweden); Petrov, I.; Greene, J. E. [Departments of Materials Science, Physics, and the Materials Research Laboratory, University of Illinois, 104 South Goodwin, Urbana, Illinois 61801 and Thin Film Physics Division, Department of Physics (IFM), Linköping University, SE-58183 Linköping (Sweden)] [Departments of Materials Science, Physics, and the Materials Research Laboratory, University of Illinois, 104 South Goodwin, Urbana, Illinois 61801 and Thin Film Physics Division, Department of Physics (IFM), Linköping University, SE-58183 Linköping (Sweden)

    2013-11-15T23:59:59.000Z

    Single-crystal ZrN films, 830 nm thick, are grown on MgO(001) at 450 °C by magnetically unbalanced reactive magnetron sputtering. The combination of high-resolution x-ray diffraction reciprocal lattice maps, high-resolution cross-sectional transmission electron microscopy, and selected-area electron diffraction shows that ZrN grows epitaxially on MgO(001) with a cube-on-cube orientational relationship, (001){sub ZrN}?(001){sub MgO} and [100]{sub ZrN}?[100]{sub MgO}. The layers are essentially fully relaxed with a lattice parameter of 0.4575 nm, in good agreement with reported results for bulk ZrN crystals. X-ray reflectivity results reveal that the films are completely dense with smooth surfaces (roughness = 1.3 nm, consistent with atomic-force microscopy analyses). Based on temperature-dependent electronic transport measurements, epitaxial ZrN/MgO(001) layers have a room-temperature resistivity ?{sub 300K} of 12.0 ??-cm, a temperature coefficient of resistivity between 100 and 300 K of 5.6 × 10{sup ?8}?-cm K{sup ?1}, a residual resistivity ?{sub o} below 30 K of 0.78 ??-cm (corresponding to a residual resistivity ratio ?{sub 300?}/?{sub 15K} = 15), and the layers exhibit a superconducting transition temperature of 10.4 K. The relatively high residual resistivity ratio, combined with long in-plane and out-of-plane x-ray coherence lengths, ?{sub ?} = 18 nm and ?{sub ?} = 161 nm, indicates high crystalline quality with low mosaicity. The reflectance of ZrN(001), as determined by variable-angle spectroscopic ellipsometry, decreases slowly from 95% at 1 eV to 90% at 2 eV with a reflectance edge at 3.04 eV. Interband transitions dominate the dielectric response above 2 eV. The ZrN(001) nanoindentation hardness and modulus are 22.7 ± 1.7 and 450 ± 25 GPa.

  5. Am phases in the matrix of a U-Pu-Zr alloy with Np, Am, and rare-earth elements

    SciTech Connect (OSTI)

    Dawn E Janney; J. Rory Kennedy; James W. Madden; Thomas P. O'Holleran

    2015-01-01T23:59:59.000Z

    Phases and microstructures in the matrix of an as-cast U-Pu-Zr alloy with 3 wt% Am, 2% Np, and 8% rare-earth elements were characterized by scanning and transmission electron microscopy. The matrix consists primarily of two phases, both of which contain Am: ?-(U, Np, Pu, Am) (~70 at% U, 5% Np, 14% Pu, 1% Am, and 10% Zr) and ?-(U, Np, Pu, Am)Zr2 (~25% U, 2% Np, 10-15% Pu, 1-2% Am, and 55-60 at% Zr). These phases are similar to those in U-Pu-Zr alloys, although the Zr content in ?-(U, Np, Pu, Am) is higher than that in ?-(U, Pu) and the Zr content in ?-(U, Np, Pu, Am)Zr2 is lower than that in ?-UZr2. Nanocrystalline actinide oxides with structures similar to UO2 occurred in some areas, but may have formed by reactions with the atmosphere during sample handling. Planar features consisting of a central zone of ?-(U, Np, Pu, Am) bracketed by zones of ?-(U, Np, Pu, Am)Zr2 bound irregular polygons ranging in size from a few micrometers to a few tens of micrometers across. The rest of the matrix consists of elongated domains of ?-(U, Np, Pu, Am) and ?-(U, Np, Pu, Am)Zr2. Each of these domains is a few tens of nanometers across and a few hundred nanometers long. The domains display strong preferred orientations involving areas a few hundred nanometers to a few micrometers across.

  6. Diffusional Interaction between U – 10wt.% Zr and Fe at 903K, 923K and 953K

    SciTech Connect (OSTI)

    K Y. Park; K. Huang; A. Ewh; Y.H. Sohn; B. H. Sencer; J. R. Kennedy

    2015-01-01T23:59:59.000Z

    U-Zr metallic fuels cladded in Fe-alloys are being considered for application in an advanced Sodium-Cooled Fast Reactor (SFR) that can recycle the U-Zr fuels and minimize the long-lived actinide waste. To understand the complex fuel-cladding chemical interaction between the U-Zr metallic fuel with Fe-alloys, a systematic multicomponent diffusion study was carried out using solid-to-solid diffusion couples. The U-10 wt.% Zr vs. pure Fe diffusion couples were assembled and annealed at temperatures, 903, 923 and 953K for 96 hours. Development of microstructure, phase constituents, and compositions developed during the thermal anneals were examined by scanning electron microscopy, transmission electron microscopy and X-ray energy dispersive spectroscopy. Complex microstructure consisting of several layers that include phases such as U6Fe, UFe2, ZrFe2, alpha-U, betha-U, Zr-precipitates, ?, e and ? were observed. Multi-phase layers were grouped based on phase constituents and microstructure, and the layer thicknesses were measured to calculate the growth constant and activation energy. The local average compositions through the interaction layer were systematically determined, and employed to construct semi-quantitative diffusion paths on isothermal U-Zr-Fe ternary phase diagrams at respective temperatures. The diffusion paths were examined to qualitatively estimate the diffusional behavior of individual components and their interactions. Furthermore, selected area diffraction analyses were carried out to determine, for the first time, the exact crystal structure and composition of ?, e and ?-phases. The ?, e and ?-phases were identified as Pnma(62) Fe(Zr,U), I4/mcm(140) Fe(Zr,U)2, and I4/mcm(140) U3(Zr,Fe), respectively.

  7. Processing of U-2.5Zr-7.5Nb and U-3Zr-9Nb alloys by sintering process

    SciTech Connect (OSTI)

    Dos Santos, A. M. M.; Ferraz, W. B.; Lameiras, F. S.; Mazzeu, T. D. O. [Centro de Desenvolvimento da Tecnologia Nuclear, CDTN-CNEN, Av. Presidente Antionio Carlos 6.627, 31270-901 Belo Horizonte, MG (Brazil)

    2012-07-01T23:59:59.000Z

    To minimize the risk of nuclear proliferation, there is worldwide interest in reducing fuel enrichment of research and test reactors. To achieve this objective while still guaranteeing criticality and cycle length requirements, there is need of developing high density uranium metallic fuels. Alloying elements such as Zr, Nb and Mo are added to uranium to improve fuel performance in reactors. In this context, the Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) is developing the U-2.5Zr-7.5Nb and U-3Zr-9Nb (weight %) alloys by the innovative process of sintering that utilizes raw materials in the form of powders. The powders were pressed at 400 MPa and then sintered under a vacuum of about 1x10{sup -4} Torr at temperatures ranging from 1050 deg. to 1500 deg.C. The densities of the alloys were measured geometrically and by hydrostatic method and the phases identified by X ray diffraction (XRD). The microstructures of the pellets were observed by scanning electron microscopy (SEM) and the alloying elements were analyzed by energy dispersive X-ray spectroscopy (EDS). The results obtained showed the fuel density to slightly increase with the sintering temperature. The highest density achieved was approximately 80% of theoretical density. It was observed in the pellets a superficial oxide layer formed during the sintering process. (authors)

  8. Syntheses, crystal structures and characterizations of BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}

    SciTech Connect (OSTI)

    Jiang Hailong [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China); Feng Meiling [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China); Mao Jianggao [State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the Graduate School of the Chinese Academy of Sciences, Fuzhou 350002 (China)]. E-mail: mjg@ms.fjirsm.ac.cn

    2006-06-15T23:59:59.000Z

    Two new barium zinc selenite and tellurite, namely, BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}, have been synthesized by the solid state reaction. The structure of BaZn(SeO{sub 3}){sub 2} features double chains of [Zn(SeO{sub 3}){sub 2}]{sup 2-} anions composed of four- and eight-member rings which are alternatively along a-axis. The double chains of [Zn{sub 2}(TeO{sub 3}){sub 2}Cl{sub 3}]{sup 3-} anions in BaZn(TeO{sub 3})Cl{sub 2} are formed by Zn{sub 3}Te{sub 3} rings in which each tellurite group connects with three ZnO{sub 3}Cl tetrahedra. BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2} are wide bandgap semiconductors based on optical diffuse reflectance spectrum measurements. -- Graphical abstract: Two new barium zinc selenite and tellurite, namely, BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2}, have been synthesized by solid state reaction. The structure of BaZn(SeO{sub 3}){sub 2} features 1D double chains of [Zn(SeO{sub 3}){sub 2}]{sup 2-} anions composed of four- and eight-member rings which are alternatively along a-axis. The 1D double chains of [Zn{sub 2}(TeO{sub 3}){sub 2}Cl{sub 3}]{sup 3-} anions in BaZn(TeO{sub 3})Cl{sub 2} are formed by Zn{sub 3}Te{sub 3} rings in which each tellurite group connects with one ZnO{sub 3}Cl and two ZnO{sub 2}Cl{sub 2} tetrahedra. BaZn(SeO{sub 3}){sub 2} and BaZn(TeO{sub 3})Cl{sub 2} are wide bandgap semiconductors based on optical diffuse reflectance spectrum measurements.

  9. Selected Topics on Hadronic B Decays From BaBar

    SciTech Connect (OSTI)

    Suzuki, K.; /SLAC

    2011-11-23T23:59:59.000Z

    Recent measurements of branching fractions and decay-rate asymmetries in charmless hadronic B decays at the BaBar experiment are presented. The selected topics include Dalitz plot analyses of B {yields} K{sup +} {pi}{sup -}{pi} and signal searches in B {yields} PP and PV, where isoscalar mesons are involved, and in B {yields} b{sub 1}P, P and V denote a pseudoscalar and vector meson, respectively. Several measurements in charmless hadronic B decays have indicated possible deviations from the theoretical predictions within the Standard Model. The measurements presented would contribute to searching for and resolving such puzzles.

  10. SeeBA Energiesysteme GmbH | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2,AUDITCalifornia Sector: WindRiegotecSeaScape Energy LtdSeeBA

  11. BA Tirunelveli Bundled Wind Project | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:EzfeedflagBiomass Conversions Inc Jump to:AurigaPlantillas Jump to:­nculosAzurRB9 EnergyBA

  12. Phase formation in ZrFe multilayers: Effect of irradiation A. T. Motta

    E-Print Network [OSTI]

    Motta, Arthur T.

    of the wavelength, indicating a process controlled by atomic transport. Amorphization was also achieved by 900 ke disappears first, indicating that amorphization takes place in the Zr layer by atomic transport of Fe from, likely because there was competition with formation of other phases. The reaction kinetics were

  13. Thermoluminescence of ZrSiO4 (zircon): A new dating method?

    E-Print Network [OSTI]

    Donoghue, Joseph

    Thermoluminescence of ZrSiO4 (zircon): A new dating method? H.J. van Es a , D.I. Vainshtein a , A (TL) dating of sediments from the Quaternary. TL of zircon results predominantly from internal0168-583X(02)00627-4 #12;Heavily damaged grains significantly reduce the thermoluminescence (TL) light

  14. ccsd00004518, Precipitation kinetics of Al 3 Zr and Al 3 Sc in

    E-Print Network [OSTI]

    , kinetics, aluminum alloys, cluster dynamics PACS: 64.60.Cn, 64.60.-i, 64.70.Kb, 64.75.+g 1 Introduction Transition elements are added to aluminum alloys so as to obtain small ordered precipitates and by this wayccsd­00004518, version 2 ­ 21 Mar 2005 Precipitation kinetics of Al 3 Zr and Al 3 Sc in aluminum

  15. Phase Stability and Thermodynamic Assessment of the Np-Zr system 

    E-Print Network [OSTI]

    Bajaj, Saurabh

    2012-02-14T23:59:59.000Z

    / clustering trends of the bcc phase, a thermodynamic study is performed using the CALPHAD method. The calculated Np-Zr phase diagram is consistent with two sets of data: formation enthalpies of the bcc phase that are calculated with ab initio KKR...

  16. Deformation Microstructures and Creep Mechanisms in Advanced ZR-Based Cladding Under Biazal Loading

    SciTech Connect (OSTI)

    K. Linga (KL) Murty

    2008-08-11T23:59:59.000Z

    Investigate creep behavior of Zr-based cladding tubes with attention to basic creep mechanisms and transitions in them at low stresses and/or temperatures and study the dislocation microstructures of deformed samples for correlation with the underlying micromechanism of creep

  17. Complexity of shear localization in a Zr-based bulk metallic glass

    E-Print Network [OSTI]

    University of Aeronautics and Astronautics, Beijing 100191, China The compressive behaviour of a Zr. A significant advance occurred when compositions and copper mold casting method allowing for bulk material the consequence of) macroscopic shear banding remains unclear. It is therefore important to carry out in situ

  18. Complexity of shear localization in a Zr-based bulk metallic glass

    E-Print Network [OSTI]

    University of Aeronautics and Astronautics, Beijing 100191, China The compressive behaviour of a Zr. A significant advance occurred when compositions and copper mold casting method allowing for bulk material unclear. It is therefore important to carry out in situ observations of plastic deformation processes

  19. Stress-corrosion fatiguecrack growth in a Zr-based bulk amorphous metal

    E-Print Network [OSTI]

    Ritchie, Robert

    Stress-corrosion fatigue­crack growth in a Zr-based bulk amorphous metal V. Schroeder 1 , R metallic glass; Amorphous metal; Fatigue; Stress corrosion; Crack growth 1. Introduction In recent years­crack growth resistance [1­5], its corresponding properties in the presence of a corrosive environment have

  20. Effect of Niobium on the Defect Chemistry and Oxidation Kinetics of Tetragonal ZrO2

    E-Print Network [OSTI]

    Yildiz, Bilge

    Effect of Niobium on the Defect Chemistry and Oxidation Kinetics of Tetragonal ZrO2 Uuganbayar, Massachusetts 02139, United States ABSTRACT: Zirconium-niobium alloys are currently proposed for applications the effect of an extrinsic defect, niobium (Nb) dopant, on the defect equilibria and charge transfer

  1. Chemical Synthesis of Pure and Gd-doped CaZrO3 Powders

    E-Print Network [OSTI]

    Tas, A. Cuneyt

    chemical synthesis techniques: (i) self-propagating combustion synthesis, and (ii) precipitation potential use as a high-temperature thermistor material.8 The electrical response of calcium zirconate (preChemical Synthesis of Pure and Gd-doped CaZrO3 Powders I. Erkin Gonenli a and A. CuÃ? neyt Tas b

  2. Phase Stability and Thermodynamic Assessment of the Np-Zr system

    E-Print Network [OSTI]

    Bajaj, Saurabh

    2012-02-14T23:59:59.000Z

    of minor actinides and fission products on phase stability. Within this framework, we present a study on phase equilibria in the binary Np-Zr alloy system on which little work has been published. To resolve the contradictory reports on the ordering...

  3. Composition and grain size effects on the structural and mechanical properties of CuZr nanoglasses

    SciTech Connect (OSTI)

    Adibi, Sara [Institute of High Performance Computing, A*STAR, 138632 Singapore (Singapore); Mechanical Engineering Department, National University of Singapore, 117576 Singapore (Singapore); Branicio, Paulo S., E-mail: branicio@ihpc.a-star.edu.sg; Zhang, Yong-Wei [Institute of High Performance Computing, A*STAR, 138632 Singapore (Singapore); Joshi, Shailendra P., E-mail: Shailendra@nus.edu.sg [Mechanical Engineering Department, National University of Singapore, 117576 Singapore (Singapore)

    2014-07-28T23:59:59.000Z

    Nanoglasses (NGs), metallic glasses (MGs) with a nanoscale grain structure, have the potential to considerably increase the ductility of traditional MGs while retaining their outstanding mechanical properties. We investigated the effects of composition on the structural and mechanical properties of CuZr NG films with grain sizes between 3 to 15?nm using molecular dynamics simulations. Results indicate a transition from localized shear banding to homogeneous superplastic flow with decreasing grain size, although the critical average grain size depends on composition: 5?nm for Cu{sub 36}Zr{sub 64} and 3?nm for Cu{sub 64}Zr{sub 36}. The flow stress of the superplastic NG at different compositions follows the trend of the yield stress of the parent MG, i.e., Cu{sub 36}Zr{sub 64} yield/flow stress: 2.54?GPa/1.29?GPa and Cu{sub 64}Zr{sub 36} yield/flow stress: 3.57?GPa /1.58?GPa. Structural analysis indicates that the differences in mechanical behavior as a function of composition are rooted at the distinct statistics of prominent atomic Voronoi polyhedra. The mechanical behavior of NGs is also affected by the grain boundary thickness and the fraction of atoms at interfaces for a given average grain size. The results suggest that the composition dependence of the mechanical behavior of NGs follows that of their parent MGs, e.g., a stronger MG will generate a stronger NG, while the intrinsic tendency for homogeneous deformation occurring at small grain size is not affected by composition.

  4. Repetitive Ultra-low Stress Induced Nanocrystallization in Amorphous Cu?Zr?Al Alloy Evidenced by in situ Nanoindentation

    E-Print Network [OSTI]

    Liu, Y.; Jian, J.; Lee, J. H.; Wang, C.; Cao, Q. P.; Gutierrez, C.; Wang, H.; Jiang, J. Z.; Zhang, X.

    2014-05-12T23:59:59.000Z

    sputtering system (DCMS, JZCK-400) by using a crystalline Cu45Zr48Al7 target. The composition of the films examined by electron-dispersive X-ray spectroscopy in a field-emission scanning electron micro- scope (FE-SEM, Hitachi S-4800) was Cu44Zr44Al12... C, Li C, Inoue A, Haas V. Deformation behavior of Zr- based bulk nanocrystalline amorphous alloys. Phys Rev B. 2000;61:R3761–R3763. [24] Chen M, Inoue A, Zhang W, Sakurai T. Extraordinary plasticity of ductile bulk metallic glasses. Phys Rev Lett...

  5. Data:7384572d-1390-4e2b-a18d-239ed8ba37eb | Open Energy Information

    Open Energy Info (EERE)

    a18d-239ed8ba37eb No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading... 1. Basic...

  6. Roadmap: German Literature, Culture and Translation Bachelor of Arts [AS-BA-GLCT

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: German Literature, Culture and Translation ­ Bachelor of Arts [AS-BA-GLCT] College of Arts Updated: 24-May12/LNHD This roadmap is a recommended semester-by-semester plan of study for this major;Roadmap: German Literature, Culture and Translation ­ Bachelor of Arts [AS-BA-GLCT] College of Arts

  7. Roadmap: Classics Latin Concentration Bachelor of Arts [AS-BA-CLSS-LAT

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Classics ­ Latin Concentration ­ Bachelor of Arts [AS-BA-CLSS-LAT] College of Arts Updated: 11-Jun-12/LNHD This roadmap is a recommended semester-by-semester plan of study for this major;Roadmap: Classics ­ Latin Concentration ­ Bachelor of Arts [AS-BA-CLSS-LAT] College of Arts and Sciences

  8. A facile method for the preparation of Eu{sup 2+}-doped nanocrystalline BaFCl

    SciTech Connect (OSTI)

    Wang, Xianglei; Liu, Zhiqiang [School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, UNSW Canberra (ADFA), Canberra, ACT 2600 (Australia); Stevens-Kalceff, Marion A. [School of Physics and Electron Microscope Unit, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2052 (Australia); Riesen, Hans, E-mail: h.riesen@adfa.edu.au [School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, UNSW Canberra (ADFA), Canberra, ACT 2600 (Australia)

    2013-10-15T23:59:59.000Z

    Graphical abstract: - Highlights: • A facile co-precipitation method for the preparation of Eu{sup 2+}-doped BaFCl. • Reduction of Eu{sup 3+} to Eu{sup 2+} by zinc granular under nitrogen flow. • Photoluminescence and cathodoluminescence spectroscopy of the as-prepared BaFCl:Eu{sup 2+}. • Temperature dependent photoluminescence properties of Eu{sup 2+} ions in BaFCl. - Abstract: A facile method for the preparation of Eu{sup 2+}-doped BaFCl is reported. The method is based on the co-precipitation of aqueous solutions of BaCl{sub 2} and NH{sub 4}F to yield BaFCl. The doping by europium in the 2+ oxidation state is realized by the reduction of Eu{sup 3+} to Eu{sup 2+} employing granular zinc in the BaCl{sub 2} solution under nitrogen. Powder X-ray diffraction and electron microscopy have been used to confirm the BaFCl phase and photoluminescence, in the temperature range of 2.5–290 K, and room-temperature cathodoluminescence spectra have been measured to characterize the Eu{sup 2+} ions in the sample.

  9. Reactivity of a Thick BaO Film Supported on Pt(111): Adsorption...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    a Thick BaO Film Supported on Pt(111): Adsorption and Reaction of NO2, H2O and CO2. Reactivity of a Thick BaO Film Supported on Pt(111): Adsorption and Reaction of NO2, H2O and...

  10. ECONOMICS BA DEGREE MAJOR REQUIREMENTS FLOWCHART FOR ACADEMIC YEAR 2012-2013

    E-Print Network [OSTI]

    Wu, Shin-Tson

    ECONOMICS BA DEGREE MAJOR REQUIREMENTS FLOWCHART FOR ACADEMIC YEAR 2012-2013 (see http://www.catalog.sdes.ucf.edu/) All B.A. Economics majors will be required to take a minimum of seven (7) electives by choosing from the following: PREREQUISITES REQUIRED ECO 3223 Money and Banking ECO 3410 Mathematical Economics ECO 3703

  11. The Catalytic Chemistry of HCN+NO over Na- and Ba-Y, FAU: An...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    The Catalytic Chemistry of HCN+NO over Na- and Ba-Y, FAU: An In Situ FTIR and TPDTPR Study. The Catalytic Chemistry of HCN+NO over Na- and Ba-Y, FAU: An In Situ FTIR and TPDTPR...

  12. The effect of BaCO3 on the hydration of OPC and composite cements

    E-Print Network [OSTI]

    Sheffield, University of

    The effect of BaCO3 on the hydration of OPC and composite cements Claire A. Utton* and Neil B of ordinary Portland cement (OPC) and up to 90% blast furnace slag (BFS), are used to encapsulate Intermediate. The effect of BaCO3 on the hydration properties of composite cements is being studied. This paper reports

  13. Submillimeter and microwave residual losses in epitaxial films of Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O

    SciTech Connect (OSTI)

    Miller, D.; Richards, P.L. [Lawrence Berkeley Lab., CA (United States); Garrison, S.M.; Newman, N. [Conductus, Inc., Sunnyvale, CA (United States); Eom, C.B.; Geballe, T.H. [Stanford Univ., CA (United States). Dept. of Applied Physics; Etemad, S.; Inam, A.; Venkatesan, T. [Bell Communications Research, Inc., Red Bank, NJ (United States); Martens, J.S. [Sandia National Labs., Albuquerque, NM (United States); Lee, W.Y. [International Business Machines Corp., San Jose, CA (United States); Bourne, L.C. [Superconductor Technologies, Inc., Santa Barbara, CA (United States)

    1992-03-01T23:59:59.000Z

    We have used a novel bolometric technique and a resonant technique to obtain accurate submillimeter and microwave residual loss data for epitaxial thin films of YBa{sub 2}Cu{sub 3}O{sub 7}, Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub 10} and Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8}. For all films we obtain good agreement between the submillimeter and microwave data, with the residual losses in both the Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O films scaling approximately as frequency squared below {approximately} 1 THz. We are able to fit the losses in the Y-Ba-Cu-O films to a weakly coupled grain model for the a-b plane conductivity, in good agreement with results from a Kramers-Kronig analysis of the loss data. We observe strong phonon structure in the Tl-Ca-Ba-Cu-O films for frequencies between 2 and 21 THz, and are unable to fit these losses to the simple weakly coupled grain model. This is in strong contrast to the case for other high {Tc} superconductors such as YBa{sub 2}Cu{sub 3}O{sub 7}, where phonon structure observed in ceramic samples is absent in epitaxial oriented films and crystals because of the electronic screening due to the high conductivity of the a-b planes.

  14. Phonon properties of BaFe?X? (X=S, Se) spin ladder compounds

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Popovicq, Z. V.; Petrovic, C.; Scepanovic, M.; Lazarevic, N.; Opacic, M.; Radonjic, M. M.; Tanaskovic, D.; Lei, Hechang

    2015-02-01T23:59:59.000Z

    We present the Raman scattering spectra of the S=2 spin ladder compounds BaFe?X? (X=S,Se) in a temperature range between 20 and 400 K. Although the crystal structures of these two compounds are both orthorhombic and very similar, they are not isostructural. The unit cell of BaFe?S? (BaFe?Se?) is base-centered Cmcm (primitive Pnma), giving 18 (36) modes to be observed in the Raman scattering experiment. We have detected almost all Raman active modes, predicted by factor group analysis, which can be observed from the cleavage planes of these compounds. Assignment of the observed Raman modes of BaFe?S(Se)? is supported by themore »lattice dynamics calculations. The antiferromagnetic long-range spin ordering in BaFe?Se? below TN=255K leaves a fingerprint both in the A1g and B3g phonon mode linewidth and energy.« less

  15. First results about hydrogen loading by means of pulsed electrolysis of Y$_{1}$Ba$_{2}$Cu$_{3}$O$_{7}$ pellets

    E-Print Network [OSTI]

    Celani, F; Di Gioacchino, D; Spallone, A; Tripodi, P; Pace, S; Polichetti, M; Marini, P

    1994-01-01T23:59:59.000Z

    First results about hydrogen loading by means of pulsed electrolysis of Y$_{1}$Ba$_{2}$Cu$_{3}$O$_{7}$ pellets

  16. Oklahoma State University Honors Degrees (May. 1969 -May, 2013) Barber Frank A. Chemistry (B.A.) AS MAY 1969

    E-Print Network [OSTI]

    Veiga, Pedro Manuel Barbosa

    .A.) AS MAY 1976 McGuigan Patrick B. History (B.A.) AS MAY 1976 Holmes William J. Humanities (B.A.) AS MAY.S.) AS MAY 1969 Seebo Thomas C. II Political Science (B.A.) AS MAY 1970 Stewart Elisabeth French (B Charles E. Spanish (B.A.) AS DEC 1972 Miller Amanda K. English (B.S.) AS MAY 1973 Potts Jon R. III History

  17. Catalytic decomposition of Ba(NO3)2 on Pt(111)

    SciTech Connect (OSTI)

    Mudiyanselage, Kumudu; Weaver, Jason F.; Szanyi, Janos

    2011-04-07T23:59:59.000Z

    The decomposition of Ba(NO3)2 formed on BaO/Pt(111) (Pt(111) surface is partially covered by BaO) in the presence of CO was studied using temperature programmed desorption (TPD), infrared reflection absorption (IRA) and X-ray photoelectron (XP) spectroscopies. The exposure of BaO/Pt(111) to elevated NO2 pressure (1.0×10-4 Torr) at 450 K leads to the formation of Ba(NO3)2, chemisorbed O (OPt) and Pt-oxide-like domains. During TPD, the Ba(NO3)2 begins to thermally decompose near 490 K, releasing NO and NO2 with the maximum NOx desorption rate seen at 605 K. The OPt species formed following the exposure of BaO/Pt(111) to NO2 react with CO to release CO2 at 450 K. The consumption of OPt during CO oxidation initiates the migration of O from the Pt-oxide-like domains to the chemisorbed phase, where the CO oxidation reaction occurs. Therefore, the removal of OPt by CO leads to the reduction of oxidized Pt, and to the formation of metallic Pt(111) domains, where, subsequently, catalytic decomposition of Ba(NO3)2 can take place. The Pt-catalyzed decomposition of Ba(NO3)2 occurs readily at 450 K, a temperature much lower than the onset of the decomposition temperature of Ba(NO3)2 in the presence of oxidized Pt. This work was supported by the US Department of Energy Basic Energy Sciences' Chemical Sciences, Geosciences & Biosciences Division. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.

  18. Synthesis and magnetic properties of the double layer perovskite CeBaFe2O5+w

    E-Print Network [OSTI]

    de Lima, Oscar Ferreira

    Synthesis and magnetic properties of the double layer perovskite CeBaFe2O5+w R. L. de Almeida,1 O The synthesis, crystallographic structure, and magnetic properties of polycrystalline single-phase samples of CeBaFe results on the successful prepara- tion and characterization of polycrystalline CeBaFe2O5+w samples. Ideal

  19. Defects and Minor Phases in O+ and Zr+ Ion Co-implanted SrTiO3...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    recovery at the surface with little recovery occurring at the damage peak, where a modest recovery is observed upon further annealing at 1423 K. Some of the implanted Zr...

  20. Ab initio investigation of phase stability of Y2Ti2O7 and Y2Zr2O7...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    to the defect-cotunnite state under high pressure. Citation: Xiao HY, F Gao, and WJ Weber.2009."Ab initio investigation of phase stability of Y2Ti2O7 and Y2Zr2O7 under high...

  1. Pressure Induced Structural Transformation in Gd2Ti2O7 and Gd2Zr2O7...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in determining the pressure induced phase transformation. Citation: Xiao HY, and WJ Weber.2011."Pressure Induced Structural Transformation in Gd2Ti2O7 and Gd2Zr2O7."Journal of...

  2. Charge-trapping characteristics of fluorinated thin ZrO{sub 2} film for nonvolatile memory applications

    SciTech Connect (OSTI)

    Huang, X. D., E-mail: eexdhuang@gmail.com, E-mail: laip@eee.hku.hk [Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096 (China); Shi, R. P.; Lai, P. T., E-mail: eexdhuang@gmail.com, E-mail: laip@eee.hku.hk [Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong (China)

    2014-04-21T23:59:59.000Z

    The effects of fluorine treatment on the charge-trapping characteristics of thin ZrO{sub 2} film are investigated by physical and electrical characterization techniques. The formation of silicate interlayer at the ZrO{sub 2}/SiO{sub 2} interface is effectively suppressed by fluorine passivation. However, excessive fluorine diffusion into the Si substrate deteriorates the quality of the SiO{sub 2}/Si interface. Compared with the ZrO{sub 2}-based memory devices with no or excessive fluorine treatment, the one with suitable fluorine-treatment time shows higher operating speed and better retention due to less resistance of built-in electric field (formed by trapped electrons) against electron injection from the substrate and smaller trap-assisted tunneling leakage, resulting from improved ZrO{sub 2}/SiO{sub 2} and SiO{sub 2}/Si interfaces.

  3. Hardness variation and cyclic crystalline-amorphous phase transformation in CuZr alloy during ball milling

    E-Print Network [OSTI]

    Schoen, David Taylor

    2005-01-01T23:59:59.000Z

    The hardness and percent crystallinity of Cu33Zr67 powder samples are measured through several cycles of a cyclic phase transformation during ball milling. Each are found to cycle with a period of approximately 320 minutes. ...

  4. Electrochemical corrosion behavior of biomedical Ti22Nb and Ti22Nb6Zr alloys in saline medium

    E-Print Network [OSTI]

    Zheng, Yufeng

    Electrochemical corrosion behavior of biomedical Ti­22Nb and Ti­22Nb­6Zr alloys in saline medium B addition and potentiodynamic polarization on the microstructure and corrosion resistance of Ti­22Nb and Ti­22Nb­6Zr alloy samples.The corrosion tests were carried out in 0.9% NaCl at 37 8C and neutral p

  5. Determination of transition frequencies in a single $^{138}$Ba$^{+}$ ion

    E-Print Network [OSTI]

    Dijck, E A; Grier, A T; Jungmann, K; Mohanty, A; Valappol, N; Willmann, L

    2015-01-01T23:59:59.000Z

    Transition frequencies between low-lying energy levels in a single trapped $^{138}$Ba$^{+}$ ion have been measured with laser spectroscopy referenced to an optical frequency comb. By extracting the frequencies of one-photon and two-photon components of the line shape using an eight-level optical Bloch model, we achieved 0.1 MHz accuracy for the 5d $^{2}$D$_{3/2}$ - 6p $^{2}$P$_{1/2}$ and 6s $^{2}$S$_{1/2}$ - 5d $^{2}$D$_{3/2}$ transition frequencies, and 0.2 MHz for the 6s $^{2}$S$_{1/2}$ - 6p $^{2}$P$_{1/2}$ transition frequency.

  6. Features of an intermetallic n-ZrNiSn semiconductor heavily doped with atoms of rare-earth metals

    SciTech Connect (OSTI)

    Romaka, V. A., E-mail: vromaka@polynet.lviv.ua [National Academy of Sciences of Ukraine, Ya. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics (Ukraine); Fruchart, D.; Hlil, E. K. [CNRS, Institute Neel (France); Gladyshevskii, R. E. [Ivan Franko Lviv National University (Ukraine); Gignoux, D. [CNRS, Institute Neel (France); Romaka, V. V.; Kuzhel, B. S. [Ivan Franko Lviv National University (Ukraine); Krayjvskii, R. V. [Lvivska Politechnika National University (Ukraine)

    2010-03-15T23:59:59.000Z

    The crystal structure, density of electron states, electron transport, and magnetic characteristics of an intermetallic n-ZrNiSn semiconductor heavily doped with atoms of rare-earth metals (R) have been studied in the ranges of temperatures 1.5-400 K, concentrations of rare-earth metal 9.5 x 10{sup 19}-9.5 x 10{sup 21} cm{sup -3}, and magnetic fields H {<=} 15 T. The regions of existence of Zr{sub 1-x}R{sub x}NiSn solid solutions are determined, criteria for solubility of atoms of rare-earth metals in ZrNiSn and for the insulator-metal transition are formulated, and the nature of 'a priori doping' of ZrNiSn is determined as a result of redistribution of Zr and Ni atoms at the crystallographic sites of Zr. Correlation between the concentration of the R impurity, the amplitude of modulation of the bands of continuous energies, and the degree of occupation of potential wells of small-scale fluctuations with charge carriers is established. The results are discussed in the context of the Shklovskii-Efros model of a heavily doped and compensated semiconductor.

  7. Synthesis and crystal structure of new layered BaNaSc(BO{sub 3}){sub 2} and BaNaY(BO{sub 3}){sub 2} orthoborates

    SciTech Connect (OSTI)

    Seryotkin, Yurii V., E-mail: yuvs@uiggm.nsc.r [Institute of Geology and Mineralogy RAS, 3, Koptyuga avenue, 630090 Novosibirsk (Russian Federation); Novosibirsk State University, 2, Pirogova street, 630090 Novosibirsk (Russian Federation); Bakakin, Vladimir V. [Institute of Inorganic Chemistry RAS, 3, Lavrentieva avenue, 630090 Novosibirsk (Russian Federation); Kokh, Aleksandr E.; Kononova, Nadezhda G. [Institute of Geology and Mineralogy RAS, 3, Koptyuga avenue, 630090 Novosibirsk (Russian Federation); Svetlyakova, Tatyana N. [Institute of Geology and Mineralogy RAS, 3, Koptyuga avenue, 630090 Novosibirsk (Russian Federation); Novosibirsk State University, 2, Pirogova street, 630090 Novosibirsk (Russian Federation); Kokh, Konstantin A. [Institute of Geology and Mineralogy RAS, 3, Koptyuga avenue, 630090 Novosibirsk (Russian Federation); Drebushchak, Tatyana N. [Novosibirsk State University, 2, Pirogova street, 630090 Novosibirsk (Russian Federation); Institute of Solid State Chemistry and Mechanochemistry RAS, 18, Kutateladze street, 630128 Novosibirsk (Russian Federation)

    2010-05-15T23:59:59.000Z

    Crystals of two new layered BaNaSc(BO{sub 3}){sub 2} (I) and BaNaY(BO{sub 3}){sub 2} (II) orthoborates are grown from the melt-solution by the spontaneous crystallization onto the platinum loop. Single crystal X-ray analysis showed that the compounds are isostructural with the space group R3-bar, a=5.23944(12) and 5.3338(2) A, and c=34.5919(11) and 35.8303(19) A for I and II, respectively, Z=6. The distinctive feature of the structure is the close-packed composite anion-cation (Ba,Na)(BO{sub 3}) layers. The layers are combined into the base building packages of two types: {l_brace}M{sup 3+}[Ba{sup 2+}(BO{sub 3}){sup 3-}]{sub 2}{r_brace}{sup +} and {l_brace}M{sup 3+}[Na{sup +}(BO{sub 3}){sup 3-}]{sub 2}{r_brace}{sup -}, where M is Sc or Y. Neutral-charge two-package (four-layer) blocks are stacked by the rhombohedral principle into twelve layers of the cubic packing. - Graphical abstract: The distinctive feature of new orthoborate crystals BaNaSc(BO{sub 3}){sub 2} and BaNaY(BO{sub 3}){sub 2} is the combination of base building packages of two types: {l_brace}M{sup 3+}[Ba{sup 2+}(BO{sub 3}){sup 3-}]{sub 2}{r_brace}{sup +} and {l_brace}M{sup 3+}[Na{sup +}(BO{sub 3}){sup 3-}]{sub 2}{r_brace}{sup -}, where M is Sc or Y.

  8. Devitrification kinetics and phase selection mechanisms in Cu-Zr metallic glasses

    SciTech Connect (OSTI)

    Kalay, Ilkay

    2010-12-15T23:59:59.000Z

    Metallic glasses have been a promising class of materials since their discovery in the 1960s. Indeed, remarkable chemical, mechanical and physical properties have attracted considerable attention, and several excellent reviews are available. Moreover, the special group of glass forming alloys known as the bulk metallic glasses (BMG) become amorphous solids even at relatively low cooling rates, allowing them to be cast in large cross sections, opening the scope of potential applications to include bulk forms and net shape structural applications. Recent studies have been reported for new bulk metallic glasses produced with lower cooling rates, from 0.1 to several hundred K/s. Some of the application products of BMGs include sporting goods, high performance springs and medical devices. Several rapid solidification techniques, including melt-spinning, atomization and surface melting have been developed to produce amorphous alloys. The aim of all these methods is to solidify the liquid phase rapidly enough to suppress the nucleation and growth of crystalline phases. Furthermore, the production of amorphous/crystalline composite (ACC) materials by partial crystallization of amorphous precursor has recently given rise to materials that provide better mechanical and magnetic properties than the monolithic amorphous or crystalline alloys. In addition, these advances illustrate the broad untapped potential of using the glassy state as an intermediate stage in the processing of new materials and nanostructures. These advances underlie the necessity of investigations on prediction and control of phase stability and microstructural dynamics during both solidification and devitrification processes. This research presented in this dissertation is mainly focused on Cu-Zr and Cu-Zr-Al alloy systems. The Cu-Zr binary system has high glass forming ability in a wide compositional range (35-70 at.% Cu). Thereby, Cu-Zr based alloys have attracted much attention according to fundamental research on the behaviors of glass forming alloys. Further motivation arising from the application of this system as a basis for many BMGs and ACC materials; the Cu-Zr system warrants this attention and offers great potential for the development of new materials. However, the prediction and control of microstructural evolution during devitrification remains challenging because of the complex devitrification behavior of the Cu-Zr binary alloy which is arising from the competition of metastable and stable phases and diversity of crystal structures. This dissertation details a systematic fundamental investigation into the mechanisms and kinetics of the various crystallization transformation processes involved in the overall devitrification response of Cu-Zr and Cu-Zr-Al glasses. Various isothermal and nonisothermal treatments are employed, and the structural response is characterized using bulk X-ray and thermal analysis methods as well as nanoscale microscopic analysis methods, revealing structural and chemical details down to the atomic-scale. By carefully combining techniques such as differential scanning calorimetry (DSC), in-situ synchrotron high energy X-ray diffraction (HEXRD), and transmission electron microscopy (TEM) to quantify the characterization transformations, this research has uncovered numerous details concerning the atomistic mechanisms of crystallization and has provided much new understanding related to the dominant phases, the overall reaction sequences, and the rate-controlling mechanisms. As such this work represents a substantial step forward in understanding these transformations and provides a clear framework for further progress toward ultimate application of controlled devitrification processing for the production of new materials with remarkable properties.

  9. Permeability of CoNbZr amorphous thin films over a wide frequency range

    SciTech Connect (OSTI)

    Koyama, H.; Tsujimoto, H.; Shirae, K.

    1987-09-01T23:59:59.000Z

    CoNbZr amorphous films have attracted the attention of many researchers because of their high saturation magnetization, high permeability, low coercivity, and nearly zero magnetostriction. For these films to be used, one of the important magnetic properties is the behavior of the permeability over a wide frequency range. We have measured the permeability of a square-shaped magnetic film (13 mm x 55 mm) sputtered on a glass substrate from 1 MHz to 400 MHz using a stripline. Over 400 MHz, the permeability of the magnetic film was measured using a ring-shaped sample mounted in a coaxial fixture. The wall motion permeability of CoNbZr amorphous films decreases from 1 kHz to nearly zero at 1 MHz. The rotation permeability is constant to 100 MHz and ferromagnetic resonance is observed near 1 GHz.

  10. Influence of multiphonon excitations and transfer on the fusion of Ca+Zr

    E-Print Network [OSTI]

    H. Esbensen; A. M. Stefanini

    2014-04-16T23:59:59.000Z

    Fusion data for $^{48}$Ca+$^{90,96}$Zr are analyzed by coupled-channels calculations that are based on the M3Y+repulsion, double-folding potential. By applying a previously determined nuclear density of $^{48}$Ca, the neutron densities of the zirconium isotopes are adjusted to optimize the fit to the fusion data, whereas the proton densities are determined by electron scattering experiments. It is shown that the fusion data can be explained fairly well by including couplings to one- and two-phonon excitations of the reacting nuclei and to one- and two-nucleon transfer reactions but there is also some sensitivity to multiphonon excitations. The neutron skin thicknesses extracted for the two zirconium isotopes are consistent with anti-proton measurements. The densities of the zirconium isotopes are used together with the previously determined nuclear density of $^{40}$Ca to calculate the M3Y+repulsion potentials and predict the fusion cross sections of $^{40}$Ca+$^{90,96}$Zr. The predicted cross sections for $^{40}$Ca+$^{90}$Zr are in reasonable agreement with the data when the influence of multiphonon excitations and a modest transfer is considered. The prediction of the $^{40}$Ca+$^{96}$Zr fusion cross section, on the other hand, is poor and under-predicts the data by 30 to 40%. Although couplings to transfer channels with positive $Q$ values were expected to play an important role, they are not able to explain the data, primarily because the predicted Coulomb barrier is about 1.5 MeV too high. Possible reasons for this failure are discussed.

  11. Thermodynamic Model for the Solubility of Ba(SeO4, SO4) Precipitates

    SciTech Connect (OSTI)

    Rai, D.; Felmy, Andrew R.; Moore, Dean A.; Kitamura, Akira; Yoshikawa, Hideki; Doi, Reisuke; Yoshida, Yasushi

    2014-08-15T23:59:59.000Z

    Abstract: The solubility of Ba(SeO4, SO4) precipitates was determined as a function of the BaSeO4 mole fractions, ranging from 0.0015 to 0.3830, and time with an equilibration period extending to as long as 302 days. Equilibrium/steady state conditions in this system are reached in ? 65 days. Pitzer’s ion interaction model was used to calculate solid and aqueous phase activity coefficients. Thermodynamic analyses showed that the data do not satisfy Gibbs-Duhem equation, thereby demonstrating that a single-solid solution phase does not control both the selenate and sulfate concentrations. Our extensive data with log 10 [Ba] ranging from ?3.6 to ?5.9 mol kg?1, log 10 [SeO4] rangingfrom?3.6 to -5.2 mol kg?1, and log 10 [SO4] ranging from?4.0 to ?5.3 mol kg?1 can be explained with the formation of an ideal BaSeO4 solid solution phase that controls the selenium concentrations and a slightly disordered/less-crystalline BaSO4(s) (log 10𝐾?sp = ?9.5 instead of ?10.05 for barite) that controls the sulfate concentrations. In these experiments the BaSO4 component of the solid solution phase never reaches thermodynamic equilibrium with the aqueous phase. Thermodynamic interpretations of the data show that both the ideal BaSeO4 solid solution phase and less-crystalline BaSO4 (s) phase are in equilibrium with each other in the entire range of BaSeO 4 mole fractions investigated in this study.

  12. A Novel Zr-1Nb Alloy and a New Look at Hydriding

    SciTech Connect (OSTI)

    Robert D. Mariani; James I. Cole; Assel Aitkaliyeva

    2013-09-01T23:59:59.000Z

    A novel Zr-1Nb has begun development based on a working model that takes into account the hydrogen permeabilities for zirconium and niobium metals. The beta-Nb secondary phase particles (SPPs) in Zr-1Nb are believed to promote more rapid hydrogen dynamics in the alloy in comparison to other zirconium alloys. Furthermore, some hydrogen release is expected at the lower temperatures corresponding to outages when the partial pressure of H2 in the coolant is less. These characteristics lessen the negative synergism between corrosion and hydriding that is otherwise observed in cladding alloys without niobium. In accord with the working model, development of nanoscale precursors was initiated to enhance the performance of existing Zr-1Nb alloys. Their characteristics and properties can be compared to oxide-dispersion strengthened alloys, and material additions have been proposed to zirconium-based LWR cladding to guard further against hydriding and to fix the size of the SPPs for microstructure stability enhancements. A preparative route is being investigated that does not require mechanical alloying, and 10 nanometer molybdenum particles have been prepared which are part of the nanoscale precursors. If successful, the approach has implications for long term dry storage of used fuel and for new routes to nanoferritic and ODS alloys.

  13. Nanolamellar magnetoelectric BaTiO3–CoFe2O4 bicrystal

    E-Print Network [OSTI]

    Ren, Shenqiang; Laver, Mark; Wuttig, Manfred

    2009-10-13T23:59:59.000Z

    Nanolamellar magnetoelectric BaTiO3–CoFe2O4 bicrystal Shenqiang Ren,1 Mark Laver,2 and Manfred Wuttig1,a#1; 1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA 2NIST Center for Neutron... Research, Gaithersburg, Maryland 20899-6103, USA #1;Received 30 July 2009; accepted 9 September 2009; published online 13 October 2009#2; Here, we report a spontaneously formed nanolamellar BaTiO3–CoFe2O4 bicrystal. #1;11¯0#2; interfaces join the BaTiO3...

  14. RAPIDLY MOVING DIVERTOR PLATES IN A TOKAMAK S.J. Zweben, R.A. Ellis, P. Titus, A. Xing, H. Zhang

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    RAPIDLY MOVING DIVERTOR PLATES IN A TOKAMAK S.J. Zweben, R.A. Ellis, P. Titus, A. Xing, H. Zhang to replace conventional actively cooled tokamak divertor plates with a set of rapidly moving, passively inertia for ~10-30 sec, and would then be removed from the vessel for processing. When outside the tokamak

  15. Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2

    E-Print Network [OSTI]

    Watson, Craig A.

    AE11 Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2 1 supplemental heat is required. Obviously there are many ways this can be accomplished from the standpoint of these factors be considered when selecting and installing a heating system. HEATING SYSTEMS Greenhouse heating

  16. Comment on `Update of 40K and 226Ra and 232Th series $\\gamma$-to-dose conversion factors for soil'

    E-Print Network [OSTI]

    Malins, Alex; Saito, Kimiaki

    2015-01-01T23:59:59.000Z

    A letter to the editor of the Journal of Environmental Radioactivity on the article: E. Gasser, A. Nachab, A. Nourreddine, Ch. Roy, and A. Sellam, `Update of 40K and 226Ra and 232Th series $\\gamma$-to-dose conversion factors for soil', J. Environ. Radioactiv. 138, 68-71 (2014), DOI: 10.1016/j.jenvrad.2014.08.002.

  17. arXiv:0810.4656v3[math.RA]11Nov2008 THE YONEDA ALGEBRA OF A K2 ALGEBRA NEED NOT

    E-Print Network [OSTI]

    Shelton, Brad

    arXiv:0810.4656v3[math.RA]11Nov2008 THE YONEDA ALGEBRA OF A K2 ALGEBRA NEED NOT BE ANOTHER K2 ALGEBRA Thomas Cassidy, Christopher Phan and Brad Shelton Department of Mathematics Bucknell University-1222 Abstract. The Yoneda algebra of a Koszul algebra or a D-Koszul al- gebra is Koszul. K2 algebras

  18. Synthesis and crystal structure of CuZrTiO{sub 5}-A new crystal structure type

    SciTech Connect (OSTI)

    Troitzsch, Ulrike [Research School of Earth Sciences, Australian National University, Canberra ACT 0200 (Australia); Christy, Andrew G., E-mail: Andrew.Christy@anu.edu.a [Research School of Earth Sciences, Australian National University, Canberra ACT 0200 (Australia); Willis, Anthony C. [Research School of Chemistry, Australian National University, Canberra ACT 0200 (Australia); Ellis, David J. [Research School of Earth Sciences, Australian National University, Canberra ACT 0200 (Australia)

    2010-03-15T23:59:59.000Z

    A new compound, CuZrTiO{sub 5}, was synthesized as strongly pleochroic green crystals from the oxides between 995 and 1010 deg. C, 1 atm. Its crystal structure was determined by single crystal XRD, resulting in R (F{sup 2}>2sigma(F{sup 2}))=0.032 and wR (all data)=0.079). CuZrTiO{sub 5} is orthorhombic, space group P2{sub 1}2{sub 1}2{sub 1}, a=3.5871(3) A, b=6.6968(4) A, c=14.6679(9) A, V=352.35(4) A{sup 3}, Z=4. The structure is topologically similar to In{sub 2}TiO{sub 5} but differs in space group and cation coordination. CuZrTiO{sub 5} has relatively regular TiO{sub 6} polyhedra, but coordination is 7+1 for Zr, and 4+2 for Cu due to the Jahn-Teller effect. Ordering of the long Cu-O bonds causes reduction in symmetry relative to In{sub 2}TiO{sub 5}. Layers of Cu alternate with Ti+Zr on (001), giving rise to a distinct cleavage. Bond valence sums on Ti and Zr are far from ideal, which appears due to the limited ability of this structural topology to avoid close next-nearest neighbour distances. - Graphical abstract: The new compound CuZrTiO{sub 5} is orthorhombic (P2{sub 1}2{sub 1}2{sub 1}), with a=3.5871(3) A, b=6.6968(4) A, c=14.6679(9) A. The structure, determined with single crystal XRD, represents a new crystal structure type that is a slight distortion of that of In{sub 2}TiO{sub 5} but differs in space group and cation coordination.

  19. RE/ZrO{sub 2} (RE = Sm, Eu) composite oxide nano-materials: Synthesis and applications in photocatalysis

    SciTech Connect (OSTI)

    Du, Weimin, E-mail: duweimin75@gmail.com [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); Zhu, Zhaoqiang [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001 (China); Zhang, Xiaofen; Wang, Dacheng; Liu, Donghe [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China); Qian, Xuefeng [School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240 (China); Du, Jimin, E-mail: djm@aynu.edu.cn [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455002 (China)

    2013-10-15T23:59:59.000Z

    Graphical abstract: - Highlights: • RE/ZrO{sub 2} (RE = Sm, Eu) nano-materials have been successfully synthesized. • Defect and electron structures determine the absorption properties on visible light. • Nano-sized Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} has good visible-light-responsive photocatalytic activities. • In the future, it can be used in wastewater treatment and environmental protection. - Abstract: Zirconia modified by Samarium/Europium, RE/ZrO{sub 2} (RE = Sm, Eu), composite oxide nano-materials have been successfully synthesized by improved sol–gel method. Characterization results show that X-ray diffraction (XRD) peaks of products gradually shift to the lower angle with the increase of rare earth which implies that the lattice distances of RE/ZrO{sub 2} nano-materials are gradually enlarged. Moreover, the molar ratios between zirconium and rare earth are consistent with the chemical formula and both of them are uniformly distributed in samples. Optical properties indicate that defect structures and electron configurations of RE/ZrO{sub 2} (RE = Sm, Eu) with single phase determine their absorption properties on visible light. Photocatalytic experiments indicate Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} nano-crystals have excellent visible-light-responsive photocatalytic activities on Methylene blue and Rhodamine B which results from the special defect structure, suitable electronic configuration, and larger specific surface area. It follows that Zr{sub 0.8}Sm{sub 0.2}O{sub 2??} nano-crystals are new visible-light-responsive photocatalysts which can be applied in dye wastewater treatment and environmental protection in the future.

  20. BA Political Economy Political Economy caters for students who wish to understand the

    E-Print Network [OSTI]

    Miall, Chris

    BA Political Economy Political Economy caters for students who wish to understand the political, philosophical and social underpinnings of modern economies,andwhomayfeeluncomfortablewiththehighly mathematical to International Relations; Introduction to Political Economy; Problems of World History/End of Empire

  1. The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD

    E-Print Network [OSTI]

    Richards-Kortum, Rebecca

    Introduction to Engineering Computation · STAT 310 Probability and Statistics · STAT 410 Introduction246 Statistics The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD Course engineering, computational and applied mathematics, managerial studies, mathematics, political science

  2. The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD

    E-Print Network [OSTI]

    Richards-Kortum, Rebecca

    Introduction to Engineering Computation · STAT 310 Probability and Statistics · STAT 410 Introduction253 Statistics The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD Course engineering, computational and applied mathematics, managerial studies, mathematics, political science

  3. Reaction of NO2 with a pure, thick BaO film: the effect of temperature...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    film: the effect of temperature on the nature of NOx species formed. Abstract: The adsorption and reaction of NO2 on a thick (>30 ML), pure BaO film deposited onto an Al2O3...

  4. BA in FAMILY HISTORY--GENEALOGY (734125) MAP Sheet Department of History

    E-Print Network [OSTI]

    Olsen Jr., Dan R.

    BA in FAMILY HISTORY--GENEALOGY (734125) MAP Sheet Department of History For students entering of the University Core Doctrinal Foundation and Religion requirement): Rel C 261* Intro to Family History (Genealogy

  5. BA in FAMILY HISTORY--GENEALOGY (734125) MAP Sheet Department of History

    E-Print Network [OSTI]

    Martinez, Tony R.

    BA in FAMILY HISTORY--GENEALOGY (734125) MAP Sheet Department of History For students entering requirement): Rel C 261* Intro to Family History (Genealogy) Rel C 293R*Specialized Studies in Family History

  6. Characteristics of Desulfation Behavior for Pre-Sulfated Pt-BaO...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    is negligible, in agreement with the results of H2 TPRX. These results suggest that H2S produced by the reduction of BaSO4 is readily re-adsorbed on the ceria support to form...

  7. Excellent Sulfur Resistance of Pt/BaO/CeO2 Lean NOx Trap Catalysts...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    and CHF Peden.2008."Excellent Sulfur Resistance of PtBaOCeO2 Lean NOx Trap Catalysts."Applied Catalysis. B, Environmental 84(3-4):545-551. doi:10.1016j.apcatb.2008.05.009...

  8. Water-induced morphology changes in BaO/?-Al2O3 NOx storage...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    materials: an FTIR, TPD, and time-resolved synchrotron XRD Water-induced morphology changes in BaO?-Al2O3 NOx storage materials: an FTIR, TPD, and time-resolved synchrotron...

  9. Changes in Jupiter's Great Red Spot (19792006) and Oval BA (20002006) Sushil Shetty *, Philip S. Marcus

    E-Print Network [OSTI]

    Marcus, Philip S.

    the magnitude of the PV anomaly of the Oval BA changed from 2000, when its cloud cover was white, to 2006, when its cloud cover was red. The best-fit results also show that the areas of the PV anomalies of the GRS and of the Oval BA are smaller than the areas of their corresponding cloud covers at all times. Using the best

  10. Multiferroic BaTiO3-CoFe2O4 Nanostructures

    E-Print Network [OSTI]

    Ramesh, R.

    an additional degree of freedom in the design of actuators, transducers, and storage devices. HoweverMultiferroic BaTiO3-CoFe2O4 Nanostructures H. Zheng,1 J. Wang,1 S. E. Lofland,3 Z. Ma,1 L. Mohaddes and magnetic order param- eters in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet. This facilitates

  11. Crystallography and Physical Properties of BaCo2As2, Ba0.94K0.06Co2As2, and Ba0.78K0.22Co2As2

    SciTech Connect (OSTI)

    Anand, V K [Ames Laboratory; Quirinale, Dante G [Ames Laboratory; Lee, Yongbin [Ames Laboratory; Harmon, Bruce N [Ames Laboratory; Furukawa, Yuji [Ames Laboratory; Ogloblichev, V V [Ural Division of Russian Academy of Science; Huq, A [Oak Ridge National Laboratory; Abernathy, D L [Oak Ridge National Laboratory; Stephens, P W [SUNY of Stony Brook; McQueeney, Robert J [Ames Laboratory; Kreyssig, Aandreas [Ames Laboratory; Goldman, Alan I [Ames Laboratory; Johnston, David C [Ames Laboratory

    2014-08-01T23:59:59.000Z

    The crystallographic and physical properties of polycrystalline and single crystal samples of BaCo2As2 and K-doped Ba{1-x}K{x}Co2As2 (x = 0.06, 0.22) are investigated by x-ray and neutron powder diffraction, magnetic susceptibility chi, magnetization, heat capacity Cp, {75}As NMR and electrical resistivity rho measurements versus temperature T. The crystals were grown using both Sn flux and CoAs self-flux, where the Sn-grown crystals contain 1.6-2.0 mol% Sn. All samples crystallize in the tetragonal ThCr2Si2-type structure (space group I4/mmm). For BaCo2As2, powder neutron diffraction data show that the c-axis lattice parameter exhibits anomalous negative thermal expansion from 10 to 300 K, whereas the a-axis lattice parameter and the unit cell volume show normal positive thermal expansion over this T range. No transitions in BaCo2As2 were found in this T range from any of the measurements. Below 40-50 K, we find rho ~ T^2 indicating a Fermi liquid ground state. A large density of states at the Fermi energy D(EF) ~ 18 states/(eV f.u.) for both spin directions is found from low-T Cp(T) measurements, whereas the band structure calculations give D(EF) = 8.23 states/(eV f.u.). The {75}As NMR shift data versus T have the same T dependence as the chi(T) data, demonstrating that the derived chi(T) data are intrinsic. The observed {75}As nuclear spin dynamics are consistent with the presence of ferromagnetic and/or stripe-type antiferromagnetic spin fluctuations. The crystals of Ba{0.78}K{0.22}Co2As2 were grown in Sn flux and show properties very similar to those of undoped BaCo2As2. On the other hand, the crystals from two batches of Ba{0.94}K{0.06}Co2As2 grown in CoAs self-flux show evidence of weak ferromagnetism at T < 10 K with small ordered moments at 1.8 K of 0.007 and 0.03 muB per formula unit, respectively.

  12. Narrow Bandgap in beta-BaZn2As2 and Its Chemical Origins

    E-Print Network [OSTI]

    Xiao, Zewen; Ueda, Shigenori; Toda, Yoshitake; Ran, Fan-Yong; Guo, Jiangang; Lei, Hechang; Matsuishi, Satoru; Hosono, Hideo; Kamiya, Toshio

    2015-01-01T23:59:59.000Z

    Beta-BaZn2As2 is known to be a p-type semiconductor with the layered crystal structure similar to that of LaZnAsO, leading to the expectation that beta-BaZn2As2 and LaZnAsO have similar bandgaps; however, the bandgap of beta-BaZn2As2 (previously-reported value ~0.2 eV) is one order of magnitude smaller than that of LaZnAsO (1.5 eV). In this paper, the reliable bandgap value of beta-BaZn2As2 is determined to be 0.23 eV from the intrinsic region of the tem-perature dependence of electrical conductivity. The origins of this narrow bandgap are discussed based on the chemi-cal bonding nature probed by 6 keV hard X-ray photoemission spectroscopy, hybrid density functional calculations, and the ligand theory. One origin is the direct As-As hybridization between adjacent [ZnAs] layers, which leads to a secondary splitting of As 4p levels and raises the valence band maximum. The other is that the non-bonding Ba 5dx2-y2 orbitals form unexpectedly deep conduction band minimum (CBM) in beta-BaZn2As2 although the CBM of L...

  13. Photoluminescent BaMoO{sub 4} nanopowders prepared by complex polymerization method (CPM)

    SciTech Connect (OSTI)

    Azevedo Marques, Ana Paula de [Laboratorio de Analise Termica e Materiais, Departamento de Quimica, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN (Brazil)]. E-mail: apamarques@liec.ufscar.br; Melo, Dulce M.A. de [Laboratorio de Analise Termica e Materiais, Departamento de Quimica, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN (Brazil); Paskocimas, Carlos A. [Departamento de Engenharia Mecanica, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN (Brazil); Pizani, Paulo S. [Laboratorio de Semicondutores, Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP (Brazil); Joya, Miryam R. [Laboratorio de Semicondutores, Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP (Brazil); Leite, Edson R. [Laboratorio Interdisciplinar de Eletroquimica e Ceramica, CMDMC, Departamento de Quimica, Universidade Federal de Sao Carlos 13565-905, Sao Carlos, SP (Brazil); Longo, Elson [CMDMC, LIEC, Instituto de Quimica, Universidade Estadual Paulista, 14801-907 Araraquara, SP (Brazil)

    2006-03-15T23:59:59.000Z

    The BaMoO{sub 4} nanopowders were prepared by the Complex Polymerization Method (CPM). The structure properties of the BaMoO{sub 4} powders were characterized by FTIR transmittance spectra, X-ray diffraction (XRD), Raman spectra, photoluminescence spectra (PL) and high-resolution scanning electron microscopy (HR-SEM). The XRD, FTIR and Raman data showed that BaMoO{sub 4} at 300 deg. C was disordered. At 400 deg. C and higher temperature, BaMoO{sub 4} crystalline scheelite-type phases could be identified, without the presence of additional phases, according to the XRD, FTIR and Raman data. The calculated average crystallite sizes, calculated by XRD, around 40 nm, showed the tendency to increase with the temperature. The crystallite sizes, obtained by HR-SEM, were around of 40-50 nm. The sample that presented the highest intensity of the red emission band was the one heat treated at 400 deg. C for 2 h, and the sample that displayed the highest intensity of the green emission band was the one heat treated at 700 deg. C for 2 h. The CPM was shown to be a low cost route for the production of BaMoO{sub 4} nanopowders, with the advantages of lower temperature, smaller time and reduced cost. The optical properties observed for BaMoO{sub 4} nanopowders suggested that this material is a highly promising candidate for photoluminescent applications.

  14. Ferroelectric and ferromagnetic properties in BaTiO{sub 3} thin films on Si (100)

    SciTech Connect (OSTI)

    Singamaneni, Srinivasa Rao, E-mail: ssingam@ncsu.edu; Prater, John T. [Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States); Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States); Punugupati, Sandhyarani; Hunte, Frank; Narayan, Jagdish [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)

    2014-09-07T23:59:59.000Z

    In this paper, we report on the epitaxial integration of room temperature lead-free ferroelectric BaTiO{sub 3} thin (?1050?nm) films on Si (100) substrates by pulsed laser deposition technique through a domain matching epitaxy paradigm. We employed MgO and TiN as buffer layers to create BaTiO{sub 3}/SrRuO{sub 3}/MgO/TiN/Si (100) heterostructures. C-axis oriented and cube-on-cube epitaxial BaTiO{sub 3} is formed on Si (100) as evidenced by the in-plane and out-of-plane x-ray diffraction, and transmission electron microscopy. X-ray photoemission spectroscopic measurements show that Ti is in 4(+) state. Polarization hysteresis measurements together with Raman spectroscopy and temperature-dependent x-ray diffraction confirm the room temperature ferroelectric nature of BaTiO{sub 3}. Furthermore, laser irradiation of BaTiO{sub 3} thin film is found to induce ferromagnetic-like behavior but affects adversely the ferroelectric characteristics. Laser irradiation induced ferromagnetic properties seem to originate from the creation of oxygen vacancies, whereas the pristine BaTiO{sub 3} shows diamagnetic behavior, as expected. This work has opened up the route for the integration of room temperature lead-free ferroelectric functional oxides on a silicon platform.

  15. Measurements of the CKM Angle Alpha at BaBar

    SciTech Connect (OSTI)

    Stracka, Simone; /Milan U. /INFN, Milan; ,

    2012-04-04T23:59:59.000Z

    The authors present improved measurements of the branching fractions and CP-asymmetries fin the B{sup 0} {yields} {pi}{sup +}{pi}{sup -}, B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}, and B{sup +} {yields} {rho}{sup +}{rho}{sup 0} decays, which impact the determination of {alpha}. The combined branching fractions of B {yields} K{sub 1}(1270){pi} and B {yields} K{sub 1}(1400){pi} decays are measured for the first time and allow a novel determination of {alpha} in the B{sup 0} {yields} {alpha}{sub 1}(1260){sup {+-}}{pi}{sup {-+}} decay channel. These measurements are performed using the final dataset collected by the BaBar detector at the PEP-II B-factory. The primary goal of the experiments based at the B factories is to test the Cabibbo-Kobayashi-Maskawa (CKM) picture of CP violation in the standard model of electroweak interactions. This can be achieved by measuring the angles and sides of the Unitarity Triangle in a redundant way.

  16. A new class of materials with promising thermoelectric properties: MNiSn (M=Ti, Zr, Hf)

    SciTech Connect (OSTI)

    Hohl, H.; Ramirez, A.P.; Kaefer, W.; Fess, K.; Thurner, Ch.; Kloc, Ch.; Bucher, E.

    1997-07-01T23:59:59.000Z

    TiNiSn, ZrNiSn and HfNiSn are members of a large group of intermetallic compounds which crystallize in the cubic MgAgAs-type structure. Polycrystalline samples of these compounds have been prepared and investigated for their thermoelectric properties. With thermopowers of about {minus}200 {micro}V/K and resistivities of a few m{Omega}cm, power factors S{sup 2}/{rho} as high as 38 {micro}W/K{sup 2}cm were obtained at 700 K. These remarkably high power factors are, however, accompanied by a thermal conductivity, solid solutions Zr{sub 1{minus}x}Hf{sub x}NiSn, Zr{sub 1{minus}x}Ti{sub x}NiSn, and Hf{prime}{sub 1{minus}x}Ti{sub x}NiSn were formed. The figure of merit of Zr{sub 0.5}Hf{sub 0.5}NiSn at 700 K (ZT = 0.41) exceeds the end members ZrNiSn (ZT = 0.26) and HfNiSn (ZT = 0.22).

  17. Microstructure characterization and electrical transport of nanocrystalline ZrO{sub 2}–CeO{sub 2} solid solution

    SciTech Connect (OSTI)

    Saha, S. [Department of Physics, National Institute of Technology, Durgapur, Burdwan 713209, West Bengal (India); Dutta, H. [Department of Physics, Vivekananda College, Burdwan 713103, West Bengal (India); Meikap, A.K., E-mail: meikapnitd@yahoo.com [Department of Physics, National Institute of Technology, Durgapur, Burdwan 713209, West Bengal (India); Pradhan, S.K., E-mail: skp_bu@yahoo.com [Department of Physics, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal (India)

    2013-10-15T23:59:59.000Z

    Graphical abstract: - Highlights: • Monoclinic ZrO{sub 2} phase has been changed to cubic ZrO{sub 2} phase within a short milling. • Conductivity increases due to change of phase from monoclinic to cubic. • A maximum has been observed in the s–T curve. • A transformation from ?ve to +ve ac magnetoconductance has been observed. - Abstract: Nanocrystalline ZrO{sub 2}–CeO{sub 2} (ZC) solid solution is synthesized by high energy ball-milling the powder mixture of monoclinic (m) ZrO{sub 2}–10 mol% CeO{sub 2} in air medium. X-ray powder diffraction (XRD) patterns show that the method IS effective to synthesize cubic (c) ZrO{sub 2} phase within a short milling time. Formation mechanism, structural and microstructural changes of different phases and relative phase abundances have been estimated by Rietveld analysis of XRD patterns. The dc conductivity has been enhanced due to monoclinic to cubic phase transformation. A transformation from small polaron hopping to correlated barrier hoping has been observed from the of temperature dependence frequency exponent study. A crossover from negative to positive ac magnetoconductance has been observed at temperature T = 280 K and 230 K for unmilled (ZC0H) and 8 h (ZC8H) milled samples, respectively.

  18. Effects of ZrO{sub 2} doping on HfO{sub 2} resistive switching memory characteristics

    SciTech Connect (OSTI)

    Ryu, Seung Wook; Kwac, Jungsuk; Nishi, Yoshio [Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Cho, Seongjae, E-mail: felixcho@gachon.ac.kr [Department of Electronic Engineering and New Technology Component and Material Research Center (NCMRC), Gachon University, Seongnam-si, Gyeonggi-do 461-741 (Korea, Republic of); Park, Joonsuk [Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States); Kim, Hyeong Joon [Department of Materials Science and Engineering and Inter-university Semiconductor Research Center (ISRC), Seoul National University, Seoul 151-744 (Korea, Republic of)

    2014-08-18T23:59:59.000Z

    A resistive switching (RS) random access memory device with ZrO{sub 2}-doped HfO{sub 2} exhibits better RS performance than that with pure HfO{sub 2}. In particular, I{sub res}, V{sub res}, and V{sub set} are reduced by approximately 58%, 38%, and 39%, respectively, when HfO{sub 2} is doped with ZrO{sub 2} (9 at.?%). In addition, the ZrO{sub 2} doping in HfO{sub 2} makes the distribution of most parameters steeper. Transmission electron microscopy (TEM) analysis reveals that the deposited zirconium-doped hafnium oxide (HZO) (9 at.?%) is polycrystalline. Elemental mapping results by scanning TEM–energy dispersive spectroscopy also prove that ZrO{sub 2} is uniformly distributed in the HZO (9 at.?%) film. The possible mechanism for the improvement in the RS characteristics is also suggested on the basis of the X-ray photoelectron spectroscopy results and filamentary RS mechanism. These results suggest that the ZrO{sub 2} doping into HfO{sub 2} likely not only will reduce power consumption but also will improve cyclic endurance by controlling the nonstoichiometric phase.

  19. Light-induced structural changes in Eu-doped (Pb,La)(Zr,Ti)O{sub 3} ceramics

    SciTech Connect (OSTI)

    Myint, Thandar; Gunawidjaja, Ray; Eilers, Hergen [Applied Sciences Laboratory, Institute for Shock Physics, Washington State University, Spokane, Washington 99210-1495 (United States)

    2011-04-25T23:59:59.000Z

    Fluorescence spectra of poled and unpoled Eu-doped (Pb,La)(Zr,Ti)O{sub 3} ceramics with various compositions were measured using 580 nm excitation. The ratio of the intensities of the Eu{sup 3+} {sup 5}D{sub 0}{yields}{sup 7}F{sub 2}/{sup 5}D{sub 0}{yields}{sup 7}F{sub 1} fluorescence transitions was used as an indicator for the symmetry of the Eu{sup 3+} site. As the symmetry decreases, the ratio increases. Increasing the Zr content in (Pb,La)(Zr,Ti)O{sub 3} increases the ratio, indicating that the symmetry of the Eu{sup 3+} site decreases. Exposure of the Eu-doped (Pb,La)(Zr,Ti)O{sub 3} samples to UV light also increases the intensity ratio, indicating that UV light exposure leads to structural distortions in Eu-doped (Pb,La)(Zr,Ti)O{sub 3} samples, lowering the Eu{sup 3+} site symmetry.

  20. Metastable phases determination of U-2.5Zr-7.5Nb and U-3.0Zr-9.0Nb alloys by Rietveld method

    SciTech Connect (OSTI)

    Dias Pais, R. W.; Dos Santos, A. M. M.; Lameiras, F. S.; Cantagalli, N. M.; De Paula, R. G.; Ferraz, W. B. [Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, CNEN, Av. Presidente Antonio Carlos 6.627, 31270-901 - Belo Horizonte, MG (Brazil)

    2012-07-01T23:59:59.000Z

    The Rietveld refinement has been employed for study of metastable phase of alloys U-2.5Zr-7.5Nb(wt%) and U-3Zr-9Nb(wt%). The ingots of both alloys were produced in vacuum induction furnace at temperature of about 1500 deg.C followed by cooling to room temperature. The samples with 2.5 cm in diameter and 0.3 cm of thickness was homogenized at 1000 deg.C/16 hours and treated isothermally at (i) 600 deg.C for 0.5, 3 and 24 hours and (ii) 300 deg.C for 4 minutes, 20 minutes and 17.5 hours. At the end of each treatment the samples were water quenched. Data from X-ray diffraction were collected at room temperature with a Rigaku diffractometer D Max-RAPID radiation Cuk{alpha} using steps of 0.02 deg. (2{theta}) with scan angle in the range of 20-80 deg. (2{theta}). The full diffraction pattern was analyzed by the Rietveld method using the GSAS program. The result shows that the non-resolved appearance of the XRD patterns added to the proximity of the Bragg reflections of the transition phase makes the refinement of alloys a challenging task. For the isothermal treatment at 600 deg.C during 0.5 and 3 hours both alloys showed the majority presence of {gamma}{sup S} phase fallow by {gamma}{sup 0} phase in minor amounts. For 24 hours at 600 deg.C occurred the decomposition of phases with the presence of {gamma}{sup S} + {alpha}. Isothermal treatment at 300 deg.C for both alloys is characterized by the presence of phases {gamma}{sup 0} + {alpha}'' where the concentration of the {alpha}'' phase increases with time of heat treatment. (authors)

  1. Search for compounds of the NaBaR(BO{sub 3}){sub 2} family (R = La, Nd, Gd, and Yb) and the new NaBaYb(BO{sub 3}){sub 2} orthoborate

    SciTech Connect (OSTI)

    Svetlyakova, T. N., E-mail: svetlyakovatn@gmail.com; Kokh, A. E.; Kononova, N. G. [Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch (Russian Federation)] [Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch (Russian Federation); Fedorov, P. P. [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)] [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation); Rashchenko, S. V. [Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch (Russian Federation)] [Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch (Russian Federation); Maillard, A. [University of Metz and Supelec, Laboratoire Materiaux Optiques, Photonique et Systemes (France)] [University of Metz and Supelec, Laboratoire Materiaux Optiques, Photonique et Systemes (France)

    2013-01-15T23:59:59.000Z

    A search for compounds of the NaBaR(BO{sub 3}){sub 2} composition (where R = La{sup 3+}, Nd{sup 3+}, Gd{sup 3+}, or Yb{sup 3+}) is performed by solid state synthesis and spontaneous crystallization. A new compound, NaBaYb(BO{sub 3}){sub 2}, is found in this series. It crystallizes in space group R3{sup -} and belongs to the family of sublayer complex orthoborates with isolated BO{sub 3} groups NaBaR(BO{sub 3}){sub 2} (R = Y, Sc, and Yb). Theoretical X-ray powder diffraction patterns of NaBaY(BO{sub 3}){sub 2}, NaBaSc(BO{sub 3}){sub 2}, and NaBaYb(BO{sub 3}){sub 2} are calculated based on single-crystal data.

  2. Pressure dependence of the superconducting critical temperature of HgBa 2Ca 2Cu 3O 8 y and HgBa 2Ca 3Cu 4O 10 y up to 30 GPa

    E-Print Network [OSTI]

    Wijngaarden, Rinke J.

    Pressure dependence of the superconducting critical temperature of HgBa 2Ca 2Cu 3O 8 y and HgBa 2Ca of the reported pressure- induced Tc values well above 150 K in the mercury-based high-Tc superconductors has been superconducting transition temperature Tc have been observed in HgBa2Ca2Cu3O8 y Hg-1223 samples under very high

  3. Pb+ irradiation of synthetic zircon (ZrSiO4): Infrared spectroscopic investigation

    SciTech Connect (OSTI)

    Zhang, Ming [University of Cambridge; Boatner, Lynn A [ORNL; Salje, Ekhard K.H. [University of Cambridge; Honda, Shin-ichi [ORNL; Ewing, Rodney C. [University of Michigan

    2008-01-01T23:59:59.000Z

    The structural variations of synthetic zircon (ZrSiO{sub 4}) single crystals irradiated at room temperature by 280 keV Pb{sup +} ions (with fluences up to 1 x 10{sup 15} ions/cm{sup 2}) were investigated using infrared (IR) spectroscopy. Like metamict zircon whose crystal structure is damaged and amorphized by naturally occurring {alpha}-decay events, the Pb{sup +}-irradiated zircon crystals show a dramatic decrease in reflectivity. However, no significant decrease in wavenumbers of the stretching vibrations of SiO{sub 4} tetrahedra in zircon was detected. The Pb{sup +}-implanted zircon exhibits new IR bands, indicating irradiation-induced new vibrations or domains, clusters or phases in addition to SiO{sub 2} and ZrO{sub 2}. IR features consistent with those of Pb silicates (with a divalent state, i.e., Pb{sup 2+}) are also found in the irradiated sample. This finding implies that some of the radiogenic Pb in natural zircon might not actually reside in the zircon lattice or in ZrSiO{sub 4} phases, but form new local domains or clusters. Infrared bands of OH-stretching vibrations were also detected in the irradiated synthetic zircon, which was originally free from OH features prior to the irradiation. These results indicate that H can easily diffuse into the irradiated layer or into irradiated-induced phases to form OH or and hydrous species after the irradiated material is damaged. The type and content of hydrous species vary with irradiation fluences.

  4. Page 1 | B.A. in Special Education Adapted Curriculum | Academic Plan of Study Updated May 2014 B.A. in Special Education (Adapted Curriculum)

    E-Print Network [OSTI]

    Raja, Anita

    Page 1 | B.A. in Special Education ­ Adapted Curriculum | Academic Plan of Study Updated May 2014 B ­ Adapted Curriculum | Academic Plan of Study Updated May 2014 Special Education - Adapted Curriculum Areas.A. in Special Education (Adapted Curriculum) Academic Plan of Study College of Education Department of Special

  5. Microstructural Characterization and Shape Memory Response of Ni-Rich NiTiHf and NiTiZr High Temperature Shape Memory Alloys

    E-Print Network [OSTI]

    Evirgen, Alper

    2014-08-14T23:59:59.000Z

    NiTiHf and NiTiZr high temperature shape memory alloys (HTSMAs) have drawn a great deal of attention as cheaper alternatives to Pt, Pd and Au alloyed NiTi-based HTSMAs while NiTiZr alloys also providing at least 20% weight reduction then its Ni...

  6. EUREM 12, Brno, Czech Republic, July 9-14, 2000 P 257 High yield incorporation of ZrCl4 into single wall carbon nanotubes

    E-Print Network [OSTI]

    Dunin-Borkowski, Rafal E.

    in a furnace, held at temperature for 1hr and then furnace cooled. The specimens were characterised using) show the filling product obtained from as-supplied ZrCl4. Figure 1(a) shows an empty SWNT tip. Below beam. The average filling yield for `as-supplied' ZrCl4 was estimated to be between 20-30%. #12;P 258

  7. First-principles phase diagram calculations for the HfCTiC, ZrCTiC, and HfCZrC solid O. Adjaoud,1,*,

    E-Print Network [OSTI]

    Steinle-Neumann, Gerd

    with and without approximations for excess vibrational free energies. Significant miscibility gaps are predicted vibrational free energy are estimated to be 7%, 20%, and 0%, for HfC­TiC, TiC­ZrC, and HfC­ZrC, respectively semiempirical methods exist to construct phase diagrams based on approximate free-energy functions

  8. Beta-decay properties of Zr and Mo neutron-rich isotopes

    E-Print Network [OSTI]

    P. Sarriguren; J. Pereira

    2010-06-08T23:59:59.000Z

    Gamow-Teller strength distributions, beta-decay half-lives, and beta-delayed neutron emission are investigated in neutron-rich Zr and Mo isotopes within a deformed quasiparticle random-phase approximation. The approach is based on a self-consistent Skyrme Hartree-Fock mean field with pairing correlations and residual separable particle-hole and particle-particle forces. Comparison with recent measurements of half-lives stresses the important role that nuclear deformation plays in the description of beta-decay properties in this mass region.

  9. WG-MOX Fuel Zr-tube Neutron Spectrum Comparison in ATR and PWR

    SciTech Connect (OSTI)

    Gray S. Chang

    2005-02-01T23:59:59.000Z

    An experiment containing WG-MOX fuel has been designed and irradiated from 1998 to 2004 in the Advanced Test Reactor (ATR) at the Idaho National Engineering and Environmental Laboratory (INEEL). Important neutronics parameters were computed using novel Monte Carlo methods. The purpose of this summary is to compare the Weapons-Grade Mixed Oxide fuel (WG-MOX) Zr-tube’s neutron spectrum in ATR and PWR. The results indicate that the Zrtube’s neutron spectrum in ATR are softer than in PWR.

  10. Electron microscopy of phase and structural transformations in soft magnetic nanocrystalline Fe-Zr-N films

    SciTech Connect (OSTI)

    Zhigalina, O. M., E-mail: zhigal@ns.crys.ras.ru; Khmelenin, D. N. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)] [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Sheftel', E. N.; Usmanova, G. Sh. [Russian Academy of Sciences, Baikov Institute of Metallurgy and Materials Science (Russian Federation)] [Russian Academy of Sciences, Baikov Institute of Metallurgy and Materials Science (Russian Federation); Vasil'ev, A. L. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)] [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Carlsson, A. [FEI Company (Netherlands)] [FEI Company (Netherlands)

    2013-03-15T23:59:59.000Z

    The effect of deposition conditions (film thickness) on the structure of soft magnetic Fe{sub 80-78}Zr{sub 10}N{sub 10-12} films formed by reactive magnetron deposition on a heat-resistant glass substrate has been investigated by analytical transmission electron microscopy, high-resolution electron microscopy, and diffraction analysis. The processes of evolution of the phase and structural state of films and the film-substrate interface upon annealing in the temperature range of 200-650 Degree-Sign C have been analyzed taking into account the thermodynamic, kinetic, and structural factors and the specific features of the nanocrystalline state.

  11. The new Hg-rich barium indium mercurides BaIn{sub x}Hg{sub 7?x} (x=3.1) and BaIn{sub x}Hg{sub 11?x} (x=0–2.8)

    SciTech Connect (OSTI)

    Wendorff, Marco; Schwarz, Michael; Röhr, Caroline, E-mail: caroline@ruby.chemie.uni-freiburg.de

    2013-07-15T23:59:59.000Z

    The title compounds BaIn{sub x}Hg{sub 7?x} (x=3.1(1)) and BaIn{sub x}Hg{sub 11?x} (x=0–2.8) were synthesized from stoichiometric ratios of the elements in Ta crucibles. Their crystal structures have been determined using single crystal X-ray data. BaIn{sub x}Hg{sub 7?x} (x=3.1(1)) crystallizes in a new structure type (orthorhombic, oC16, space group Cmmm: a=512.02(1), b=1227.68(3), c=668.61(2) pm, Z=2, R1=0.0311). In the structure, the atoms of the three crystallographically different mixed In/Hg positions form planar nets of four-, six- and eight-membered rings. These nets are shifted against each other such that the four-membered rings form empty distorted cubes. The cubes are connected via common edges, corners and folded ladders, which are also found in BaIn{sub 2}/BaHg{sub 2} (KHg{sub 2} structure type) and BaIn (?-NaHg type). The Ba atoms are centered in the eight-membered rings and exhibit an overall coordination number of 20. The [BaM{sub 20}] polyhedra and twice as many distorted [M{sub 8}] cubes tesselate the space. BaIn{sub 2.8}Hg{sub 8.2} (cubic, cP36, space group Pm3{sup ¯}m, a=961.83(1) pm, Z=3, R1=0.0243) is the border compound of the phase width BaIn{sub x}Hg{sub 11?x} of the rare BaHg{sub 11} structure type. In the structure, ideal [M{sub 8}] cubes (at the corners of the unit cell) and BaM{sub 20} polyhedra (at the edges of the unit cell) represent the building blocks comparable to the other new In mercuride. In accordance with the increased In/Hg content, additional M-pure regions appear: the center of the unit cell contains a huge [Hg(1)M(2){sub 12}M(3,4){sub 32}] polyhedron, a Hg-centered cuboctahedron of In/Hg atoms surrounded by a capped cantellated cube of 32 additional M atoms. For both structure types, the bonding situation and the ‘coloring’, i.e. the In/Hg distribution of the polyanionic network, are discussed considering the different sizes of the atoms and the charge distribution (Bader AIM charges), which have been calculated within the framework of FP-LAPW density functional theory. - Graphical abstract: BaIn{sub 2.6}Hg{sub 4.4}: distorted cubes [(In/Hg){sub 8}] (green, like in BaHg{sub 11}), folded ladders (violet, like in BaIn, BaHg{sub 2} and BaIn{sub 2}) and Ba coordination polyhedra [Ba(In/Hg){sub 20}] (blue, like in BaHg{sub 11}). - Highlights: • The Hg-rich In-mercuride BaIn{sub 3.1}Hg{sub 3.9} crystallizes with a singular structure type. • The phase width of the BaHg{sub 11} structure in BaIn{sub x}Hg{sub 11-x} ends at x=2.8. • The relations of both compounds with other alkaline-earth mercurides are outlined. • The Hg/In coloring of the polyanion is discussed considering the structure features. • Bonding aspects are explored using band structure calculations.

  12. Fundamental science investigations to develop a 6-MV laser triggered gas switch for ZR: first annual report.

    SciTech Connect (OSTI)

    Warne, Larry Kevin; Van Den Avyle, James A.; Lehr, Jane Marie; Rose, David (Voss Scientific, Albuquerque, NM); Krompholz, Hermann G. (Texas Tech University, Lubbock, TX); Vela, Russell (Texas Tech University, Lubbock, TX); Jorgenson, Roy Eberhardt; Timoshkin, Igor (University of Strathclyde, Glasgow, Scotland); Woodworth, Joseph Ray; Prestwich, Kenneth Randel (Voss Scientific, Albuquerque, NM); Krile, John (Texas Tech University, Lubbock, TX); Given, Martin (University of Strathclyde, Glasgow, Scotland); McKee, G. Randall; Rosenthal, Stephen Edgar; Struve, Kenneth William; Welch, Dale Robert (Voss Scientific, Albuquerque, NM); Benwell, Andrew L. (University of Missouri-Columbia, Columbia, Missouri); Kovaleski, Scott (University of Missouri-Columbia, Columbia, Missouri); LeChien, Keith, R.; Johnson, David (Titan Pulse Sciences Division); Fouracre, R.A. (University of Strathclyde, Glasgow, Scotland); Yeckel, Chris (University of Missouri-Columbia, Columbia, Missouri); Wakeland, Peter Eric (Ktech Corporation, Albuquerque, NM); Miller, A. R. (Titan Pulse Sciences Division); Hodge, Keith Conquest (Ktech Corporation, Albuquerque, NM); Pasik, Michael Francis; Savage, Mark Edward; Maenchen, John Eric; Curry, Randy D. (University of Missouri-Columbia, Columbia, Missouri); Feltz, Greg (Ktech Corporation, Albuquerque, NM); Bliss, David Emery; MacGregor, Scott (University of Strathclyde, Glasgow, Scotland); Corley, J. P. (Ktech Corporation, Albuquerque, NM); Anaya, Victor (Ktech Corporation, Albuquerque, NM); Wallace, Zachariah (Ktech Corporation, Albuquerque, NM); Thoma, Carsten (Voss Scientific, Albuquerque, NM); Neuber, Andreas. (Texas Tech University, Lubbock, TX)

    2007-03-01T23:59:59.000Z

    In October 2005, an intensive three-year Laser Triggered Gas Switch (LTGS) development program was initiated to investigate and solve observed performance and reliability issues with the LTGS for ZR. The approach taken has been one of mission-focused research: to revisit and reassess the design, to establish a fundamental understanding of LTGS operation and failure modes, and to test evolving operational hypotheses. This effort is aimed toward deploying an initial switch for ZR in 2007, on supporting rolling upgrades to ZR as the technology can be developed, and to prepare with scientific understanding for the even higher voltage switches anticipated needed for future high-yield accelerators. The ZR LTGS was identified as a potential area of concern quite early, but since initial assessments performed on a simplified Switch Test Bed (STB) at 5 MV showed 300-shot lifetimes on multiple switch builds, this component was judged acceptable. When the Z{sub 20} engineering module was brought online in October 2003 frequent flashovers of the plastic switch envelope were observed at the increased stresses required to compensate for the programmatically increased ZR load inductance. As of October 2006, there have been 1423 Z{sub 20} shots assessing a variety of LTGS designs. Numerous incremental and fundamental switch design modifications have been investigated. As we continue to investigate the LTGS, the basic science of plastic surface tracking, laser triggering, cascade breakdown, and optics degradation remain high-priority mission-focused research topics. Significant progress has been made and, while the switch does not yet achieve design requirements, we are on the path to develop successively better switches for rolling upgrade improvements to ZR. This report summarizes the work performed in FY 2006 by the large team. A high-level summary is followed by detailed individual topical reports.

  13. Intrinsic nanostructure in Zr2 xFe4Si16 y (x = 0.81, y = 6.06)

    SciTech Connect (OSTI)

    Smith, G J [Stony Brook University, Department of Physics and Astronomy; Simonson, Jack [Stony Brook University (SUNY); Prozorov, R. [Ames Laboratory and Iowa State University; Zhu, Y [Brookhaven National Laboratory (BNL); Aronson, M. [Stony Brook University, Department of Physics and Astronomy

    2014-01-01T23:59:59.000Z

    We present a study of the crystal structure and physical properties of single crystals of a new Fe-based ternary compound, Zr2 xFe4Si16 y (x = 0.81, y = 6.06). Zr1.19Fe4Si9.94 is a layered compound, where stoichiometric -FeSi2-derived slabs are separated by Zr-Si planes with substantial numbers of vacancies. High resolution transmission electron microscopy (HRTEM) experiments show that these Zr-Si layers consist of 3.5 nm domains where the Zr and Si vacancies are ordered within a supercell sixteen times the volume of the stoichiometric cell. Within these domains, the occupancies of the Zr and Si sites obey symmetry rules that permit only certain compositions, none of which by themselves reproduce the average composition found in x-ray diffraction experiments. Magnetic susceptibility and magnetization measurements reveal a small but appreciable number of magnetic moments that remain freely fluctuating to 1.8 K, while neutron diffraction confirms the absence of bulk magnetic order with a moment of 0.2 B or larger down to 1.5 K. Electrical resistivity measurements find that Zr1.19Fe4Si9.94 is metallic, and the modest value of the Sommerfeld coefficient of the specific heat = C/T suggests that quasi-particle masses are not particularly strongly enhanced. The onset of superconductivity at Tc 6 K results in a partial resistive transition and a small Meissner signal, although a bulk-like transition is found in the specific heat. Sharp peaks in the ac susceptibility signal the interplay of the normal skin depth and the London penetration depth, typical of a system in which nano-sized superconducting grains are separated by a non-superconducting host. Ultra low field differential magnetic susceptibility measurements reveal the presence of a surprisingly large number of trace magnetic and superconducting phases, suggesting that the Zr-Fe-Si ternary system could be a potentially rich source of new bulk superconductors.

  14. Preliminary study of niobium alloy contamination by transport through helium. [Nb-1Zr; Sm-Co; Hiperco 50 steel; alumina

    SciTech Connect (OSTI)

    Scheuermann, C.M.; Moore, T.J.; Wheeler, D.R.

    1987-01-12T23:59:59.000Z

    Preliminary tests were conducted to determine if interstitial element transport through a circulating helium working fluid was a potential problem in Brayton and Stirling space power systems. Test specimens exposed to a thermal gradient for up to 3000 h included Nb-1%Zr, a Sm-Co alloy, Hiperco 50 steel, and alumina to simulate various engine components of the Brayton and Stirling systems. Results indicate that helium transport of interstitial contaminants can be minimized over a 7-y life with monometallic Nb-1%Zr design. Exposure with other materials indicated a potential for interstitial contaminant transport.

  15. Improved high temperature refractory. [MgCr/sub 2/O/sub 4/ composite with ZrO/sub 2/

    DOE Patents [OSTI]

    Singh, J.P.; James, J.; Picciolo, J.J.

    1985-12-10T23:59:59.000Z

    A high chromia refractory composite has been developed with improved thermal shock resistance and containing about 5 to 30 wt % of unstabilized ZrO/sub 2/ having a temperature-dependent phase change resulting in large expansion mismatch between the ZrO/sub 2/ and the chromia matrix which causes microcracks to form during cooling in the high chromia matrix. The particle size preferably is primarily between about 0.6 to 5 microns and particularly below about 3 microns with an average size in the order of 1.2 to 1.8 microns.

  16. KCP R.A'S

    National Nuclear Security Administration (NNSA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA Approved:Administration SandiaAdministration News |Jordan | National

  17. Microsoft Word - Ra-15

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaeferApril 1,(EAC)TABLE OF CONTENTS 1of: U.S.5 OakNews MediaDavidRecords

  18. Significant increase of Curie temperature in nano-scale BaTiO{sub 3}

    SciTech Connect (OSTI)

    Li, Yueliang; Liao, Zhenyu; Fang, Fang; Zhu, Jing, E-mail: jzhu@mail.tsinghua.edu.cn [National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing 100084 (China); Wang, Xiaohui; Li, Longtu [State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)

    2014-11-03T23:59:59.000Z

    The low Curie temperature (T{sub c}?=?130?°C) of bulk BaTiO{sub 3} greatly limits its applications. In this work, the phase structures of BaTiO{sub 3} nanoparticles with sizes ranging from 2.5?nm to 10?nm were studied at various temperatures by using aberration-corrected transmission electron microscopy (TEM) equipped with an in-situ heating holder. The results implied that each BaTiO{sub 3} nanoparticle was composed of different phases, and the ferroelectric ones were observed in the shells due to the complicated surface structure. The ferroelectric phases in BaTiO{sub 3} nanoparticles remained at 600?°C, suggesting a significant increase of T{sub c}. Based on the in-situ TEM results and the data reported by others, temperature-size phase diagrams for BaTiO{sub 3} particles and ceramics were proposed, showing that the phase transition became diffused and the T{sub c} obviously increased with decreasing size. The present work sheds light on the design and fabrication of advanced devices for high temperature applications.

  19. Synthesis and characterization of rare earth doped ZrO{sub 2} nanophosphors

    SciTech Connect (OSTI)

    Agrawal, Sadhana, E-mail: sagrawal.phy@nitrr.ac.in, E-mail: jsvikasdubey@gmail.com; Dubey, Vikas, E-mail: sagrawal.phy@nitrr.ac.in, E-mail: jsvikasdubey@gmail.com [Department of Physics, National Institute of Technology, Raipur (C.G.) (India)

    2014-10-24T23:59:59.000Z

    In this paper, we reports synthesis, characterization and thermoluminescence (TL) glow curves of europium and dysprosium activated zirconium dioxide (ZrO{sub 2}: Eu{sup 3+}, Dy{sup 3+}) phosphor with variable concentration of europium and fixed concentration of dysprosium. The sample was prepared by the Solid state method; thereafter, the TL glow curves were recorded for different concentration of europium with 20 min UV exposure at a heating rate of 6.7°C/s. The trapping parameters for synthesized phosphors of ZrO{sub 2}: Eu{sup 3+}, Dy{sup 3+} have been calculated by using a peak shape method. The sample was characterized for structural analysis by XRD (X-ray diffraction) and morphological analysis by FEGSEM (field emission gun scanning electron microscope) and FTIR (Fourier transform infrared spectroscopy). The effect of variable europium concentration and fixed dysprosium concentration on TL studies were interpreted and the formation of trap depth and reproducibility of prepared phosphor were analyzed by TL glow curves. The peak temperature on TL less than 200°C shows the formation of deep trapping in prepared sample. The high temperature peak shows the less fading and more stability in prepared sample.

  20. Precipitation in a Cu–Cr–Zr–Mg alloy during aging

    SciTech Connect (OSTI)

    Cheng, J.Y., E-mail: bigchengjianyi@163.com; Shen, B.; Yu, F.X.

    2013-07-15T23:59:59.000Z

    The precipitation processes in a Cu-0.69Cr-0.10Zr-0.02Mg alloy aged at 450 °C and 550 °C have been investigated by transmission electron microscopy and high resolution transmission electron microscopy. The precipitation sequence in this alloy aged at 450 °C is: supersaturated solid solution ? Guinier–Preston zone (fcc Cr-rich phase) ? ordered fcc Cr-rich phase ? ordered bcc Cr-rich phase. The precipitation sequence in this alloy aged at 550 °C is: supersaturated solid solution ? ordered fcc Cr-rich phase ? ordered bcc Cr-rich phase. In the evolution of decomposition, the orientation relationship between the precipitates and the Cu matrix changes from cube-on-cube to Nishiyama–Wassermann orientation. The ordering of Cr-rich precipitates facilitates the formation of the bcc precipitates and promotes the development of Nishiyama–Wassermann orientation. - Highlights: • Two different precipitation sequences in the Cu–Cr–Zr–Mg alloy are proposed. • The changes in orientation relationship of the precipitates are presented. • The roles of ordering and coherent interface of the precipitates are discussed.

  1. Synthesis of ZrO{sub 2} nanoparticles by hydrothermal treatment

    SciTech Connect (OSTI)

    Machmudah, Siti, E-mail: machmudah@chem-eng.its.ac.id; Widiyastuti, W., E-mail: machmudah@chem-eng.its.ac.id; Prastuti, Okky Putri, E-mail: machmudah@chem-eng.its.ac.id; Nurtono, Tantular, E-mail: machmudah@chem-eng.its.ac.id; Winardi, Sugeng, E-mail: machmudah@chem-eng.its.ac.id [Chemical Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya 60111 (Indonesia); Wahyudiono,; Kanda, Hideki; Goto, Motonobu [Department of Chemical Engineering, Nagoya University, Nagoya 464-8603 (Japan)

    2014-02-24T23:59:59.000Z

    Zirconium oxide (zirconia, ZrO{sub 2}) is the most common material used for electrolyte of solid oxide fuel cells (SOFCs). Zirconia has attracted attention for applications in optical coatings, buffer layers for growing superconductors, thermal-shield, corrosion resistant coatings, ionic conductors, and oxygen sensors, and for potential applications including transparent optical devices and electrochemical capacitor electrodes, fuel cells, catalysts, and advanced ceramics. In this work, zirconia particles were synthesized from ZrCl{sub 4} precursor with hydrothermal treatment in a batch reactor. Hydrothermal treatment may allow obtaining nanoparticles and sintered materials with controlled chemical and structural characteristics. Hydrothermal treatment was carried out at temperatures of 150 – 200°C with precursor concentration of 0.1 – 0.5 M. Zirconia particles obtained from this treatment were analyzed by using SEM, PSD and XRD to characterize the morphology, particle size distribution, and crystallinity, respectively. Based on the analysis, the size of zirconia particles were around 200 nm and it became smaller with decreasing precursor concentration. The increasing temperature caused the particles formed having uniform size. Zirconia particles formed by hydrothermal treatment were monoclinic, tetragonal and cubic crystal.

  2. ZrN coatings deposited by high power impulse magnetron sputtering and cathodic arc techniques

    SciTech Connect (OSTI)

    Purandare, Yashodhan, E-mail: Y.Purandare@shu.ac.uk; Ehiasarian, Arutiun; Hovsepian, Papken [Nanotechnology Centre for PVD Research, Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB (United Kingdom); Santana, Antonio [Ionbond AG Olten, Industriestrasse 211, CH-4600 Olten (Switzerland)

    2014-05-15T23:59:59.000Z

    Zirconium nitride (ZrN) coatings were deposited on 1??m finish high speed steel and 316L stainless steel test coupons. Cathodic Arc (CA) and High Power Impulse Magnetron Sputtering (HIPIMS) + Unbalanced Magnetron Sputtering (UBM) techniques were utilized to deposit coatings. CA plasmas are known to be rich in metal and gas ions of the depositing species as well as macroparticles (droplets) emitted from the arc sports. Combining HIPIMS technique with UBM in the same deposition process facilitated increased ion bombardment on the depositing species during coating growth maintaining high deposition rate. Prior to coating deposition, substrates were pretreated with Zr{sup +} rich plasma, for both arc deposited and HIPIMS deposited coatings, which led to a very high scratch adhesion value (L{sub C2}) of 100 N. Characterization results revealed the overall thickness of the coatings in the range of 2.5??m with hardness in the range of 30–40?GPa depending on the deposition technique. Cross-sectional transmission electron microscopy and tribological experiments such as dry sliding wear tests and corrosion studies have been utilized to study the effects of ion bombardment on the structure and properties of these coatings. In all the cases, HIPIMS assisted UBM deposited coating fared equal or better than the arc deposited coatings, the reasons being discussed in this paper. Thus H+U coatings provide a good alternative to arc deposited where smooth, dense coatings are required and macrodroplets cannot be tolerated.

  3. New Insights into Reaction Mechanisms of Ethanol Steam Reforming on Co-ZrO2

    SciTech Connect (OSTI)

    Sun, Junming; Karim, Ayman M.; Mei, Donghai; Engelhard, Mark H.; Bao, Xinhe; Wang, Yong

    2015-01-01T23:59:59.000Z

    The reaction pathway of ethanol steam reforming on Co-ZrO2 has been identified and the active sites associated with each step are proposed. Ethanol is converted to acetaldehyde and then to acetone, followed by acetone steam reforming. More than 90% carbon was found to follow this reaction pathway. N2-Sorption, X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR), in situ X-ray Photoelectron Spectroscopy (XPS), Transmission Electron Microscopy, as well as theoretical Density Functional Theory (DFT) calculations have been employed to identify the structure and functionality of the catalysts, which was further used to correlate their performance in ESR. It was found that metallic cobalt is mainly responsible for the acetone steam reforming reactions; while, CoO and basic sites on the support play a key role in converting ethanol to acetone via dehydrogenation and condensation/ketonization reaction pathways. The current work provides fundamental understanding of the ethanol steam reforming reaction mechanisms on Co-ZrO2 catalysts and sheds light on the rational design of selective and durable ethanol steam reforming catalysts.

  4. Field-effect BaTiO{sub 3}-Si solar cells

    SciTech Connect (OSTI)

    Wang, Wentao; Liu, Fude, E-mail: fordliu@hku.hk; Man Lau, Chor; Wang, Lei; Yang, Guandong; Zheng, Dawei [Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong (China); Li, Zhigang [Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong (China)

    2014-03-24T23:59:59.000Z

    Conventional solar cells make use of the spatial variation in electronic environment due to junctions for charge separation. We investigated field-effect BaTiO{sub 3}-Si solar cells that utilize the bound surface charges of BaTiO{sub 3} to separate charge carriers in silicon. Rectifying behavior and photovoltaic effect were observed on cells with forward polarization. Theoretical simulation indicated that the induced electric field due to BaTiO{sub 3} polarization could extend into the silicon layer, which is consistent with experimental observations. In addition, adjusting relevant parameters may optimize the electric field distribution. The cells are promising in terms of material selection, device design, and fabrication.

  5. EXPLAINING THE Sr AND Ba SCATTER IN EXTREMELY METAL-POOR STARS

    SciTech Connect (OSTI)

    Aoki, W.; Suda, T.; Boyd, R. N.; Kajino, T.; Famiano, M. A., E-mail: aoki.wako@nao.ac.jp, E-mail: takuma.suda@nao.ac.jp, E-mail: richard11boyde@comcast.net, E-mail: kajino@nao.ac.jp, E-mail: michael.famiano@wmich.edu [National Astronomical Observatory of Japan, 2-21-1 Mitaka, Tokyo 181-8588 (Japan)

    2013-03-20T23:59:59.000Z

    Compilations of abundances of strontium and barium in extremely metal-poor stars show that an apparent cutoff is observed for [Sr/Ba] at [Fe/H] < -3.6 and large fluctuations for [Fe/H] > -3.6 with a clear upper bound depending on metallicity. We study the factors that place upper limits on the logarithmic ratio [Sr/Ba]. A model is developed in which the collapses of type II supernovae are found to reproduce many of the features seen in the data. This model is consistent with galactic chemical evolution constraints of light-element enrichment in metal-poor stars. Effects of turbulence in an explosive site have also been simulated, and are found to be important in explaining the large scatter observed in the [Sr/Ba] data.

  6. SnO2 atomic layer deposition on ZrO2 and Al nanoparticles: Pathway to enhanced thermite materials

    E-Print Network [OSTI]

    George, Steven M.

    SnO2 atomic layer deposition on ZrO2 and Al nanoparticles: Pathway to enhanced thermite materials J of Colorado, Boulder, CO 80309-0414, United States Available online 1 June 2005 Abstract Thermite mixtures with traditional thermite mixtures. One technique to create thermite mixtures with improved contact is to deposit

  7. Kinetic Modeling of Slurry Propylene Polymerization using rac-Et(Ind)2ZrCl2/MAO

    E-Print Network [OSTI]

    Kinetic Modeling of Slurry Propylene Polymerization using rac-Et(Ind)2ZrCl2/MAO Ramon A. Gonzalez in Wiley InterScience (www.interscience.wiley.com). The slurry homopolymerization of propylene catalyzed using a systematic optimization strategy. The model predicts that the insertion of the first propylene

  8. Magnetic properties of HITPERM ,,Fe,Co...88Zr7B4Cu1 magnets M. A. Willard,a)

    E-Print Network [OSTI]

    Laughlin, David E.

    power applications requires new bulk soft magnetic materials that 1 are capable of operating at higher magnetization that persists to the phase transformation at 980 °C. Alternating current permeability experiments nanocrystalline Fe­Si­B­Nb­Cu alloys and nanocrystalline Fe­M­B­Cu M Zr, Nb, Hf, etc. alloys have been optimized

  9. Repetitive Ultra-low Stress Induced Nanocrystallization in Amorphous Cu?Zr?Al Alloy Evidenced by in situ Nanoindentation 

    E-Print Network [OSTI]

    Liu, Y.; Jian, J.; Lee, J. H.; Wang, C.; Cao, Q. P.; Gutierrez, C.; Wang, H.; Jiang, J. Z.; Zhang, X.

    2014-05-12T23:59:59.000Z

    . In this study, we show, via in situ nanoindentation of amorphous Cu44Zr44Al12 alloy in a transmission electron microscope that the formation of nanocrystals occurred at an ultra-low stress of 0.25 GPa in the elastic deformation regime, accompanied by load...

  10. Materials Science and Engineering A 483484 (2008) 607610 Indentation creep study on a Zr-based bulk metallic

    E-Print Network [OSTI]

    Gubicza, Jenõ

    2008-01-01T23:59:59.000Z

    to the formation of a quasicrystalline phase. Indentation creep tests were carried out isothermally at the same size quasicrystalline particles on the creep behavior is studied by indentation test. There are onlyMaterials Science and Engineering A 483­484 (2008) 607­610 Indentation creep study on a Zr

  11. First-principles study of the stability and migration of Kr, I and Xe in ZrO2

    SciTech Connect (OSTI)

    Xiao, Haiyan [University of Tennessee, Knoxville (UTK); Weber, William J [ORNL; Zhang, Yanwen [ORNL

    2014-01-01T23:59:59.000Z

    The stability and migration of Kr, I and Xe in bulk ZrO2 and on the ZrO2 (1 1 1) surface have been studied by standard density functional theory (DFT) and the DFT-D2 method that corrects for the van der Waals interaction. Both methods show that Kr and Xe prefer to incorporate in the bulk phase rather than adsorb on the surface, and Xe is very mobile in the bulk state. For Kr and Xe adsorption on the surface, van der Waals interaction dominates, causing the weak interaction between the adsorbate and substrate. Iodine is found to have comparable stability in both phases and forms I O bonds with strong covalency. It exhibits higher mobility on the surface than in the bulk ZrO2, and diffusion from bulk-like state to surface state is an exothermic process. The fission product behavior in ZrO2 is shown to be a complicated synergetic effect of fission product atomic size, electron negativity, occupation site and phase structure of the host.

  12. Effect of La2Zr2O7 on Interfacial Resistance in Solid Oxide J. R. Smith,a

    E-Print Network [OSTI]

    Florida, University of

    Effect of La2Zr2O7 on Interfacial Resistance in Solid Oxide Fuel Cells A. Chen,a J. R. Smith,a K. L manuscript received August 9, 2010. Published September 14, 2010. Solid oxide fuel cells SOFC are energy to gas phase transport in porous media, is controlled by optimizing electrode mi- crostructures

  13. Intrinsic Nanostructure in Zr2-xFe4Si16-y (x=0.81, y=6.06)

    SciTech Connect (OSTI)

    Smith, G J [Stony Brook University; Simonson, J W [Stony Brook University; Orvis, T [Stony Brook University; Marques, C [Stony Brook University; Grose, J E [Stony Brook University; Kistner-Morris, J J [Stony Brook University; Wu, L [Brookhaven National Laboratory; Cho, Kyuil [Ames Laboratory; Kim, Hyong june [Ames Laboratory; Tanatar, Makariy A [Ames Laboratory; Garlea, V O [Oak Ridge National Laboratory; Prozorov, Ruslan [Ames Laboratory; Zhu, Y [Brookhaven National Laboratory; Aronson, M C [Stony Brook University

    2014-09-17T23:59:59.000Z

    We present a study of the crystal structure and physical properties of single crystals of a new Fe-based ternary compound, Zr2?x Fe4Si16?y(x=0.81,y=6.06). Zr1.19 Fe4Si9.94 is a layered compound, where stoichiometric ?-FeSi2-derived slabs are separated by Zr-Si planes with substantial numbers of vacancies. High resolution transmission electron microscopy (HRTEM) experiments show that these Zr-Si layers consist of 3.5nm domains where the Zrand Si vacancies are ordered within a supercell sixteen times the volume of the stoichiometric cell. Within these domains, the occupancies of the Zr and Si sites obey symmetry rules that permit only certain compositions, none of which by themselves reproduce the average composition found in x-ray diffraction experiments. Magnetic susceptibility and magnetization measurements reveal a small but appreciable number of magnetic moments that remain freely fluctuating to 1.8K, while neutron diffraction confirms the absence of bulk magnetic order with a moment of 0.2? B or larger down to 1.5K. Electrical resistivity measurements find that Zr1.19Fe4Si9.94 is metallic, and the modest value of the Sommerfeld coefficient of the specific heat ? = C/T suggests that quasi-particle masses are not particularly strongly enhanced. The onset of superconductivity at Tc 6K results in a partial resistive transition and a small Meissner signal, although a bulk-like transition is found in the specific heat. Sharp peaks in the ac susceptibility signal the interplay of the normal skin depth and the London penetration depth, typical of a system in which nano-sized superconducting grains are separated by a on-superconducting host. Ultra low field differential magnetic susceptibility measurements reveal the presence of a surprisingly large number of trace magnetic and superconducting phases, suggesting that the Zr-Fe-Si ternary system could be a potentially rich source of new bulk superconductor.

  14. Electric transport properties of the pentatelluride materials HfTe{sub 5} and ZrTe{sub 5}

    SciTech Connect (OSTI)

    Tritt, T.M.; Wilson, M.L.; Littleton, R.L. [and others

    1997-07-01T23:59:59.000Z

    The authors have measured the resistivity and thermopower of single crystals as well as polycrystalline pressed powders of the low-dimensional pentatelluride materials: HfTe{sub 5} and ZrTe{sub 5}. They have performed these measurements as a function of temperature between 5K and 320K. In the single crystals there is a peak in the resistivity for both materials at a peak temperature, T{sub p} where T{sub p} {approx} 80K for HfTe{sub 5} and T{sub p} {approx} 145K for ZrTe{sub 5}. Both materials exhibit a large p-type thermopower around room temperature which undergoes a change to n-type below the peak. These data are similar to behavior observed previously in these materials. They have also synthesized pressed powders of polycrystalline pentatelluride materials, HfTe{sub 5} and ZrTe{sub 5}. They have measured the resistivity and thermopower of these polycrystalline materials as a function of temperature between 5K and 320K. For the polycrystalline material, the room temperature thermopower for each of these materials is relatively high, +95 {micro}V/K and +65 {micro}V/K for HfTe{sub 5} and ZrTe{sub 5}, respectively. These values compare closely to thermopower values for single crystals of these materials. At 77 K, the thermopower is +55 {micro}V/K for HfTe{sub 5} and +35 {micro}V/K for ZrTe{sub 5}. In fact, the thermopower for the polycrystals decreases monotonically with temperature to T {approx} 5K, thus exhibiting p-type behavior over the entire range of temperature. As expected, the resistivity for the polycrystals is higher than the single crystal material, with values of 430 m{Omega}-cm and 24 m{Omega}-cm for HfTe{sub 5} and ZrTe{sub 5} respectively, compared to single crystal values of 0.35 m{Omega}-cm (HfTe{sub 5}) and 1.0 m{Omega}-cm (ZrTe{sub 5}). The authors have found that the peak in the resistivity evident in both single crystal materials is absent in these polycrystalline materials. They will discuss these materials in relation to their potential as candidates for thermoelectric applications.

  15. Phase relationships in the BaO-Y?O?-Cu-O system

    E-Print Network [OSTI]

    Hegg, Turi

    1989-01-01T23:59:59.000Z

    Os ? CuO showing the solid solution region for "the other perovskite" after Roth et al. 107 59. I'he BaO ? YsOs ? Cu ? 0 base plane of the polyhedra The quaternary BaO ? YsOs ? Cu ? 0 system with the suggested primary phase fields . 61. Pseudo... become insulating svhen z::. 7. 1, this means that the 213 compound goes from an insulating to a semiconducting to a superconducting to an insulating state as oxygen is added. The 213 compound has an oxygen-deficient perovskite structure . Its unit...

  16. Energy Calibration of the BaBar EMC Using the Pi0 Invariant Mass Method

    SciTech Connect (OSTI)

    Tanner, David J.; /Manchester U.

    2007-04-06T23:59:59.000Z

    The BaBar electromagnetic calorimeter energy calibration method was compared with the local and global peak iteration procedures, of Crystal Barrel and CLEO-II. An investigation was made of the possibility of {Upsilon}(4S) background reduction which could lead to increased statistics over a shorter time interval, for efficient calibration runs. The BaBar software package was used with unreconstructed data to study the energy response of the calorimeter, by utilizing the {pi}{sup 0} mass constraint on pairs of photon clusters.

  17. The Radiation Dose Measurement System for the BaBar Electromagnetic Calorimeter

    SciTech Connect (OSTI)

    Khan, A.; /Brunel U.; Meyer, W.T.; /Iowa State U.; Stelzer, J.; /Stanford U., Phys. Dept.; Yi, Jong; /Manchester U.

    2006-08-14T23:59:59.000Z

    An array of 116 p-channel radiation sensitive MOSFET transistors (RadFETs) has been operational for the past 6 years at the BaBar experiment at the PEP-II asymmetric B-Factory at the Stanford Linear Accelerator Center (SLAC). This system maps the integrated dose absorbed by different regions of the Electromagnetic Calorimeter (EMC) during the running of the experiment. We report on the design and implementation of the system and finally, the performance of the monitoring system during the last 6 years of BaBar data-taking.

  18. College of Charleston Major Roadmap: Religious Studies, B.A. | 2014-15 Page 1 MAJOR ROADMAP

    E-Print Network [OSTI]

    Kasman, Alex

    College of Charleston Major Roadmap: Religious Studies, B.A. | 2014-15 Page 1 MAJOR ROADMAP Religious Studies, B.A. Catalog Year: 2014-15 This roadmap is a suggested semester-by-semester planning availability may vary from semester to semester. Roadmaps are not meant to cover every possibility

  19. NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on ?-Al2O3. NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on ?-Al2O3....

  20. PLAN OF STUDY Digital Media & Design SCHOOL OF FINE ARTS 2013-2014Catalog BA in DMD

    E-Print Network [OSTI]

    Alpay, S. Pamir

    PLAN OF STUDY ­ Digital Media & Design SCHOOL OF FINE ARTS 2013-2014Catalog BA in DMD ATTACH YOUR ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ ______ _____ __ ______ University of Connecticut DMD BA REQUIREMENTS: 51 credits DMD courses (21 credits): DMD 1000 (3) ­ Digital Foundation DMD 1030 (3) ­ Animation Lab DMD 2010 (3) ­ Digital Culture DMD 3050 (3) ­ Visible Language DMD

  1. JOB EVALUATION QUESTIONNAIRE (JEQ) This form is reusable. Write answers on the JEQ Answer Sheet (BA Form 803).

    E-Print Network [OSTI]

    Amin, S. Massoud

    JOB EVALUATION QUESTIONNAIRE (JEQ) This form is reusable. Write answers on the JEQ Answer Sheet (BA, they provide a more precise measure of a job's requirements than a few general questions do. 2. Use black ink or type when completing the Answer Sheet (BA Form 803) 3. Write a brief description of what the job

  2. Effect of Y-211 particle size on the growth of single grain Y–Ba–Cu–O bulk superconductors

    E-Print Network [OSTI]

    Thoma, Max; Shi, Yunhua; Dennis, Tony; Durrell, John; Cardwell, David

    2014-12-01T23:59:59.000Z

    The engineering of fine Y2Ba1Cu1O5 (Y-211) inclusions of average particle size 1?2 ?m within the continuous, superconducting YBa2Cu3O7?? (Y-123) phase matrix of single-grain, bulk high temperature Y–Ba–Cu–O (YBCO) superconductors is fundamental...

  3. An, Yanming, Professor, Languages. BA, 1982, MA, 1985, Fudan University (China); PhD, University of Michigan,

    E-Print Network [OSTI]

    Stuart, Steven J.

    253 Faculty An, Yanming, Professor, Languages. BA, 1982, MA, 1985, Fudan University (China); PhD, Environmental Engineering & Earth Sciences. BME, École Polytechnique of Montréal (Canada), 2005; MS, 2007, PhD & Biomolecular Engineering. BA, Clemson University, 1973; MS, 1977, PhD, 1981, University of Massachusetts

  4. Rapid Relaxation and Embrittlement of Zr-based Bulk Metallic Glasses by Electropulsing

    SciTech Connect (OSTI)

    Yiu, P [Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan; Chen, Y. C. [National Taiwan University of Science & Technology; Chu, J. P. [National Taiwan Ocean University; Chang, S Y [National Chung Hsing University; Bei, Hongbin [ORNL; Jang, J. S.C. [National Central University, Jhongli 32001, Taiwan; Hsueh, C. H. [Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan

    2013-01-01T23:59:59.000Z

    Mechanical relaxation and embrittlement of Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glasses were achieved rapidly by the direct current electropulsing treatment. The temperature profile was recorded by an infrared camera and it was found to be non-uniform in the treated specimen. Specifically, temperatures below the glass transition temperature, near and above the crystallization temperature could be ach- ieved, respectively, at different locations in the same treated specimen. Two sets of nanoindentation were conducted. While the first set investigated the mechanical properties of three individually elec- tropulsed specimens with different conditions, the second set indented a single treated specimen along its temperature gradient. Both sets of indentation revealed that by Joule heating to different tempera- tures, relaxation, embrittlement, and crystallization were significantly accelerated by electrical pulses. Results suggest that electropulsing provides an opportunity to simultaneously achieve plastic forming and mechanical property control of metallic glasses.

  5. Physicochemical investigations of carbon nanofiber supported Cu/ZrO{sub 2} catalyst

    SciTech Connect (OSTI)

    Din, Israf Ud, E-mail: drisraf@yahoo.com, E-mail: maizats@petronas.com.my; Shaharun, Maizatul S., E-mail: drisraf@yahoo.com, E-mail: maizats@petronas.com.my [Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS (Malaysia); Subbarao, Duvvuri, E-mail: duvvuri-subbarao@petronas.com.my [Department of Chemical Engineering, Universiti Teknologi PETRONAS (Malaysia); Naeem, A., E-mail: naeeem64@yahoo.com [National Centre of Excellence in Physical Chemistry, University of Peshawar (Pakistan)

    2014-10-24T23:59:59.000Z

    Zirconia-promoted copper/carbon nanofiber catalysts (Cu?ZrO{sub 2}/CNF) were prepared by the sequential deposition precipitation method. The Herringbone type of carbon nanofiber GNF-100 (Graphite nanofiber) was used as a catalyst support. Carbon nanofiber was oxidized to (CNF-O) with 5% and 65 % concentration of nitric acid (HNO{sub 3}). The CNF activated with 5% HNO{sub 3} produced higher surface area which is 155 m{sup 2}/g. The catalyst was characterized by X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) and N{sub 2} adsorption-desorption. The results showed that increase of HNO{sub 3} concentration reduced the surface area and porosity of the catalyst.

  6. Estimated 55Mn and 90Zr cross section covariances in the fast neutron energy region

    SciTech Connect (OSTI)

    Pigni,M.T.; Herman, M.; Oblozinsky, P.

    2008-06-24T23:59:59.000Z

    We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from keV range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.

  7. Serrated flow behaviors of a Zr-based bulk metallic glass by nanoindentation

    SciTech Connect (OSTI)

    Cheng, L.; Jiao, Z. M.; Ma, S. G.; Wang, Z. H., E-mail: qiaojunwei@gmail.com, E-mail: wangzhihua@tyut.edu.cn [Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024 (China); Qiao, J. W., E-mail: qiaojunwei@gmail.com, E-mail: wangzhihua@tyut.edu.cn [Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024 (China); Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024 (China)

    2014-02-28T23:59:59.000Z

    Instrumented nanoindentation tests were used to investigate the mechanical properties of Zr{sub 52.5}Cu{sub 17.9}Ni{sub 14.6}Al{sub 10}Ti{sub 5} bulk metallic glass. The corresponding loading strain rates were ranged from 0.002?s{sup ?1}, 0.02?s{sup ?1} to 0.2?s{sup ?1}. Plastic flow of this material exhibited remarkable serrations at low strain rates and increasingly became weakening until disappearance with increasing indentation strain rate, implying strong rate sensitivity. A significant pile-up around the indents was observed through atomic force microscopy, which suggested a highly localized plastic deformation. Mechanism governing the deformation was tentatively discussed in terms of the increasing process of free volume with a negligible temperature rise under low strain rate, which well explained the declining trend of elastic modulus and hardness with an increase of indentation depth.

  8. Heavy Residue Formation in 20 MeV/nucleon 197Au + 90Zr collisions

    E-Print Network [OSTI]

    G. A. Souliotis; W. Loveland; K. Hanold; G. J. Wozniak; D. J. Morrissey

    2001-10-25T23:59:59.000Z

    The yields and velocity distributions of heavy residues and fission fragments from the reaction of 20 MeV/nucleon 197Au + 90Zr have been measured using the MSU A1200 fragment separator. A bimodal distribution of residues is observed, with one group, resulting from peripheral collisions, having fragment mass numbers A=160-200, while the other group, resulting from ``hard'' collisions, has A=120-160. This latter group of residues can be distinguished from fission fragments by their lower velocities. A model combining deep-inelastic transfer and incomplete fusion for the primary interaction stage and a statistical evaporation code for the deexcitation stage has been used to describe the properties of the product distributions.

  9. Phase characterization and grain size effects of nanophase Y{sub 2}O{sub 3}, ZrO{sub 2} and Y{sub 2}O{sub 3}-ZrO{sub 2} composites produced by the gas-phase condensation technique

    SciTech Connect (OSTI)

    Foster, C.M.; Bai, G.R. [Argonne National Lab., IL (United States); Parker, J.C.; Ali, M.N. [Nanophase Technologies Corp., Darien, IL (United States)

    1992-12-01T23:59:59.000Z

    Nanophase (n-) ZrO{sub 2} was produce in its pure and partially stabilized form by the gas-phase condensation method. The material was examined by x-ray diffraction and Raman scattering to obtain information on the structural evolution of the material during sintering. Two types of Y{sub 2}O{sub 3} doped ZrO{sub 2} doped ZrO{sub 2} nanophase materials were made, one by co-deposition of n-Y{sub 2}O{sub 3} and n-ZrO{sub 2}. We have determined that the co-deposition process is the most effect means of doping the n-ZrO{sub 2}.

  10. Phase characterization and grain size effects of nanophase Y[sub 2]O[sub 3], ZrO[sub 2] and Y[sub 2]O[sub 3]-ZrO[sub 2] composites produced by the gas-phase condensation technique

    SciTech Connect (OSTI)

    Foster, C.M.; Bai, G.R. (Argonne National Lab., IL (United States)); Parker, J.C.; Ali, M.N. (Nanophase Technologies Corp., Darien, IL (United States))

    1992-12-01T23:59:59.000Z

    Nanophase (n-) ZrO[sub 2] was produce in its pure and partially stabilized form by the gas-phase condensation method. The material was examined by x-ray diffraction and Raman scattering to obtain information on the structural evolution of the material during sintering. Two types of Y[sub 2]O[sub 3] doped ZrO[sub 2] doped ZrO[sub 2] nanophase materials were made, one by co-deposition of n-Y[sub 2]O[sub 3] and n-ZrO[sub 2]. We have determined that the co-deposition process is the most effect means of doping the n-ZrO[sub 2].

  11. Continuous production of granular or powder Ti, Zr and Hf or their alloy products

    DOE Patents [OSTI]

    White, Jack C. (Albany, OR); Oden, Laurance L. (Albany, OR)

    1993-01-01T23:59:59.000Z

    A continuous process for producing a granular metal selected from the group consisting of Ti, Zr or Hf under conditions that provide orderly growth of the metal free of halide inclusions comprising: a) dissolving a reducing metal selected from the group consisting of Na, Mg, Li or K in their respective halide salts to produce a reducing molten salt stream; b) preparing a second molten salt stream containing the halide salt of Ti, Zr or Hf; c) mixing and reacting the two molten streams of steps a) and b) in a continuous stirred tank reactor; d) wherein steps a) through c) are conducted at a temperature range of from about 800.degree. C. to about 1100.degree. C. so that a weight percent of equilibrium solubility of the reducing metal in its respective halide salt varies from about 1.6 weight percent at about 900.degree. C. to about 14.4 weight percent at about 1062.degree. C.; and wherein a range of concentration of the halide salt of Ti, Zn or Hf in molten halides of Na, Mg, Li or K is from about 1 to about 5 times the concentration of Na, Mg, Li or K; e) placing the reacted molten stream from step c) in a solid-liquid separator to recover an impure granular metal product by decantation, centrifugation, or filtration; and f) removing residual halide salt impurity by vacuum evaporator or inert gas sweep at temperatures from about 850.degree. C. to 1000.degree. C. or cooling the impure granular metal product to ambient temperature and water leaching off the residual metal halide salt.

  12. Current scaling of axially radiated power in dynamic hohlraums and dynamic hohlraum load design for ZR.

    SciTech Connect (OSTI)

    Mock, Raymond Cecil; Nash, Thomas J.; Sanford, Thomas W. L.

    2007-03-01T23:59:59.000Z

    We present designs for dynamic hohlraum z-pinch loads on the 28 MA, 140 ns driver ZR. The scaling of axially radiated power with current in dynamic hohlraums is reviewed. With adequate stability on ZR this scaling indicates that 30 TW of axially radiated power should be possible. The performance of the dynamic hohlraum load on the 20 MA, 100 ns driver Z is extensively reviewed. The baseline z-pinch load on Z is a nested tungsten wire array imploding onto on-axis foam. Data from a variety of x-ray diagnostics fielded on Z are presented. These diagnostics include x-ray diodes, bolometers, fast x-ray imaging cameras, and crystal spectrometers. Analysis of these data indicates that the peak dynamic radiation temperature on Z is between 250 and 300 eV from a diameter less than 1 mm. Radiation from the dynamic hohlraum itself or from a radiatively driven pellet within the dynamic hohlraum has been used to probe a variety of matter associated with the dynamic hohlraum: the tungsten z-pinch itself, tungsten sliding across the end-on apertures, a titanium foil over the end aperture, and a silicon aerogel end cap. Data showing the existence of asymmetry in radiation emanating from the two ends of the dynamic hohlraum is presented, along with data showing load configurations that mitigate this asymmetry. 1D simulations of the dynamic hohlraum implosion are presented and compared to experimental data. The simulations provide insight into the dynamic hohlraum behavior but are not necessarily a reliable design tool because of the inherently 3D behavior of the imploding nested tungsten wire arrays.

  13. Isoscalar giant dipole resonance in Zr-90, Sn-116, and Pb-208

    E-Print Network [OSTI]

    Clark, HL; Lui, YW; Youngblood, David H.

    2001-01-01T23:59:59.000Z

    0.26a 0.545b 43.3 61.4 7.75 0.567 aReference @13#. bReference @19#. Isoscalar giant dipole resonanc H. L. Clark, Y.-W. Lui Cyclotron Institute, Texas A&M University ~Received 30 August 2000; Strength functions for isoscalar dipole excitations... density for the ISGDR is @6# r~r !52b1 /RA3@3r2d/dr110r25/3^r2&d/dr1e~rd2/dr2 14d/dr !#ro~r !. For one state which exhausts the energy weighted sum rule @6# ?2001 The American Physical Society1 inelasti e RAPID COMMUNICATIONS H. L. CLARK, Y.-W. LUI...

  14. Computer Science B.A. Degree Curriculum Chart: 2013-2014

    E-Print Network [OSTI]

    Stuart, Josh

    Computer Science B.A. Degree Curriculum Chart: 2013-2014 http://ua.soe.ucsc.edu · advising Comparative Programming Languages CMPS 115 Software Methodology CMPS 122 Computer Security CMPS 140 Artificial Intelligence CMPS 160 Computer Graphics CMPS 180 Database Systems CMPE 110 Computer Architecture 2. Students

  15. Computer Science B.A. Degree 2014-2015 Curriculum Chart

    E-Print Network [OSTI]

    Stuart, Josh

    Computer Science B.A. Degree 2014-2015 Curriculum Chart CMPS 12B/M Data Structures *CMPS 13H to Prog: Java CMPS 11 Intermediate Programming *CMPE 13/L Computer Systems and C Programming OR OR *CMPE to Analysis of Algorithms CMPS 140 Artificial Intelligence CMPS 104A Compiler Design CMPS 160 Computer

  16. Adaptive risk management for certifiably sustainable forestry B.A. Wintle a,

    E-Print Network [OSTI]

    Adaptive risk management for certifiably sustainable forestry B.A. Wintle a, *, D.B. Lindenmayer b Adaptive risk management Due diligence Monitoring Population viability analysis (PVA) Multi-model inference for biodiversity, (ii) formal risk assessment of competing management options that integrate impacts

  17. Department of Mechanical Engineering University of Bath, Bath BA2 7AY, UK

    E-Print Network [OSTI]

    Burton, Geoffrey R.

    . The balance between activities has shifted through the years with an increasing emphasis on research), and today as City of Bristol College #12;Department of Mechanical Engineering University of Bath, Bath BA2 7 vision and energy. Ted retired in 1987, and was succeeded as Director by Cliff Burrows. In 1992 Kevin

  18. Roadmap: Criminology and Justice Studies Corrections Bachelor of Arts [AS-BA-CRJU-CORR

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Criminology and Justice Studies ­ Corrections ­ Bachelor of Arts [AS-BA-CRJU-CORR] College/LNHD This roadmap is a recommended semester-by-semester plan of study for this major. However, courses Hours] JUS 46792 Internship 0-6 Recommended but not required #12;Roadmap: Criminology and Justice

  19. Roadmap: Communication Studies Public Communication Bachelor of Arts [CI-BA-COMM-PCMM

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Communication Studies ­ Public Communication ­ Bachelor of Arts [CI-BA-COMM-PCMM] College: 23-May-12/LNHD This roadmap is a recommended semester-by-semester plan of study for this major 2 #12;Roadmap: Communication Studies ­ Public Communication ­ Bachelor of Arts [CI

  20. Roadmap: Criminology and Justice Studies Policing Bachelor of Arts [AS-BA-CRJU-POLG

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Criminology and Justice Studies ­ Policing ­ Bachelor of Arts [AS-BA-CRJU-POLG] College/LNHD This roadmap is a recommended semester-by-semester plan of study for this major. However, courses Elective 3 See note 3 on page 2 General Electives (upper division) 9 #12;Roadmap: Criminology

  1. Roadmap: Theatre Studies Theatre and Society-Bachelor of Arts [CA-BA-THEA-THSO

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Theatre Studies ­ Theatre and Society- Bachelor of Arts [CA-BA-THEA-THSO] College This roadmap is a recommended semester-by-semester plan of study for this major. However, courses Requirement 3 Kent Core Requirement 3 General Elective (upper division) 3 See note 2 on page 3 #12;Roadmap

  2. The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD

    E-Print Network [OSTI]

    Richards-Kortum, Rebecca

    211Introduction to Engineering Computation · STAT310Probability and Statistics · STAT410Introduction263 Statistics The George R. Brown School of Engineering Degrees Offered: BA, MStat, MA, PhD Course engineering, computational and applied mathematics, managerial studies, mathematics, political science

  3. Spectroscopy, polarization and nonadiabatic dynamics of electronically excited Ba(Ar)n clusters: Theory and experiment

    E-Print Network [OSTI]

    Krylov, Anna I.

    Spectroscopy, polarization and nonadiabatic dynamics of electronically excited Ba(Ar)n clusters, France Received 13 September 1995; accepted 17 November 1995 Molecular Dynamics simulations using, a comprehensive picture of the excited state dynamics is given. It is found that upon excitation, energy

  4. Roadmap: Communication Studies -Applied Communication -Bachelor of Arts [CI-BA-COMM-APCO

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Communication Studies - Applied Communication - Bachelor of Arts [CI-BA-COMM-APCO] College of Communication and Information School of Communication Studies Catalog Year: 2012­2013 Page 1 of 3 | Last Updated Major GPA Important Notes Semester One: [16 Credit Hours] COMM 15000 Introduction to Human Communication

  5. Measurement of branching fraction and first evidence of CP violation in B??a?±(1260)?? decays

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dalseno, J.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Bay, A.; Belous, K.; Bhuyan, B.; et al

    2012-11-01T23:59:59.000Z

    We present a measurement of the branching fraction and time-dependent CP violation parameters in B??a±?(1260)?? decays. The results are obtained from the final data sample containing 772×10? BB¯¯¯ pairs collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e?e? collider. We obtain the product branching fraction B(B??a±?(1260)??)×B(a±?(1260)??±???±)=(11.1±1.0(stat)±1.4(syst))×10?? and an upper limit on the product branching fraction for a possible decay with the same final state B(B??a±?(1320)??)×B(a±?(1320)??±???±)more »respectively. Simultaneously, we also extract the CP-conserving parameters ?C=+0.54±0.11(stat)±0.07(syst), ?S=–0.09±0.14(stat)±0.06(syst), which, respectively, describe a rate difference and strong phase difference between the decay channels where the a±? does not contain the spectator quark and those where it does. We find first evidence of mixing-induced CP violation in B??a±?(1260)?? decays with 3.1? significance. The rate where the a±? does not contain the spectator quark from the B meson is found to dominate the rate where it does at the 4.1? level. However, there is no evidence for either time- and flavor-integrated direct CP violation or flavor-dependent direct CP violation.« less

  6. Atomic and electronic structure of the ferroelectric BaTiO{sub 3}/Ge(001) interface

    SciTech Connect (OSTI)

    Fredrickson, Kurt D.; Ponath, Patrick; Posadas, Agham B.; Demkov, Alexander A., E-mail: demkov@physics.utexas.edu [Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (United States); McCartney, Martha R.; Smith, David J. [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States); Aoki, Toshihiro [LeRoy Eyring Center for Solid State Science, Arizona State University, Tempe, Arizona 85287 (United States)

    2014-06-16T23:59:59.000Z

    In this study, we demonstrate the epitaxial growth of BaTiO{sub 3} on Ge(001) by molecular beam epitaxy using a thin Zintl template buffer layer. A combination of density functional theory, atomic-resolution electron microscopy and in situ photoemission spectroscopy is used to investigate the electronic properties and atomic structure of the BaTiO{sub 3}/Ge interface. Aberration-corrected scanning transmission electron micrographs reveal that the Ge(001) 2?×?1 surface reconstruction remains intact during the subsequent BaTiO{sub 3} growth, thereby enabling a choice to be made between several theoretically predicted interface structures. The measured valence band offset of 2.7?eV matches well with the theoretical value of 2.5?eV based on the model structure for an in-plane-polarized interface. The agreement between the calculated and measured band offsets, which are highly sensitive to the detailed atomic arrangement, indicates that the most likely BaTiO{sub 3}/Ge(001) interface structure has been identified.

  7. Influence of Ba content on grain size and dynamics of crystallization in barium ferrite thin films

    E-Print Network [OSTI]

    Laughlin, David E.

    Influence of Ba content on grain size and dynamics of crystallization in barium ferrite thin films of the crystallization process, which ultimately determines the grain size, were studied in barium ferrite thin films. Rapid thermal annealing was used to crystallize the amorphous as-deposited barium ferrite films

  8. Internal conversion coefficients in (134)Cs, (137)Ba, and (139)La: A precise test of theory 

    E-Print Network [OSTI]

    Nica, N.; Hardy, John C.; Iacob, V. E.; Balonek, C.; Trzhaskovskaya, M. B.

    2008-01-01T23:59:59.000Z

    Recently we measured the ratio of K-shell internal conversion coefficients, alpha(K), for the 127.5-keV E3 transition in (134)Cs and the 661.7-keV M4 transition in (137)Ba. We here report a measurement of the 165.9-keV M1 ...

  9. Search for Physics Beyond the Standard Model at BaBar and Belle

    E-Print Network [OSTI]

    G. Calderini

    2012-04-19T23:59:59.000Z

    Recent results on the search for new physics at BaBar and Belle B-factories are presented. The search for a light Higgs boson produced in the decay of different Y resonances is shown. In addition, recent measurements aimed to discover invisible final states produced by new physics mechanisms beyond the standard model are presented.

  10. Computer Science Major Worksheet B.A. Degree Student: _______________________ ID#___________ Catalog:_________ Advisor _____________

    E-Print Network [OSTI]

    Delene, David J.

    10/15/2012 Computer Science Major Worksheet ­ B.A. Degree Student: _______________________ ID#___________ Catalog:_________ Advisor _____________ Computer Science Required Courses Cr. Semester Gr. CSci 160 Computer Science I 4 CSci 161 Computer Science II 4 CSci 230 Systems Programming 3 CSci 242 Algo. & Data

  11. NAME__________________________________ REQUIREMENTS FOR THE B.A. DEGREE IN COMPUTER SCIENCE

    E-Print Network [OSTI]

    Thomas, Andrew

    NAME__________________________________ REQUIREMENTS FOR THE B.A. DEGREE IN COMPUTER SCIENCE (effective entering class Fall 2013) 1) REQUIRED COMPUTER SCIENCE COURSES (Total of 47 CS credit hours) * COS.00 or greater as must the overall GPA. February 18, 2013 #12;Computer Science Summary Total Total CS Hrs Hrs Q

  12. Measurement of branching fraction and first evidence of CP violation in B??a?±(1260)?? decays

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dalseno, J.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Bay, A.; Belous, K.; Bhuyan, B.; Bozek, A.; Bra?ko, M.; Brovchenko, O.; Browder, T. E.; Chekelian, V.; Chen, A.; Chen, P.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, I.-S.; Cho, K.; Choi, Y.; Doležal, Z.; Drásal, Z.; Eidelman, S.; Fast, J. E.; Gaur, V.; Gabyshev, N.; Garmash, A.; Goh, Y. M.; Hayashii, H.; Horii, Y.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Julius, T.; Kang, J. H.; Kiesling, C.; Kim, H. O.; Kim, J. B.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Koblitz, S.; Kodyš, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kronenbitter, B.; Kuhr, T.; Kumita, T.; Kwon, Y.-J.; Lee, S.-H.; Li, J.; Libby, J.; Liu, C.; Liu, Z. Q.; Louvot, R.; MacNaughton, J.; Matvienko, D.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mohanty, G. B.; Mohapatra, D.; Moll, A.; Muramatsu, N.; Nakao, M.; Natkaniec, Z.; Nedelkovska, E.; Ng, C.; Nishida, S.; Nishimura, K.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petri?, M.; Piilonen, L. E.; Prim, M.; Prothmann, K.; Ritter, M.; Röhrken, M.; Sahoo, H.; Sakai, Y.; Sanuki, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shibata, T.-A.; Shiu, J.-G.; Sibidanov, A.; Simon, F.; Smerkol, P.; Sohn, Y.-S.; Solovieva, E.; Stari?, M.; Sumihama, M.; Sumiyoshi, T.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Uchida, M.; Uehara, S.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Vanhoefer, P.; Varner, G.; Wang, C. H.; Wang, P.; Watanabe, M.; Watanabe, Y.; Williams, K. M.; Won, E.; Yabsley, B. D.; Yamashita, Y.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

    2012-11-01T23:59:59.000Z

    We present a measurement of the branching fraction and time-dependent CP violation parameters in B??a±?(1260)?? decays. The results are obtained from the final data sample containing 772×10? BB¯¯¯ pairs collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e?e? collider. We obtain the product branching fraction B(B??a±?(1260)??)×B(a±?(1260)??±???±)=(11.1±1.0(stat)±1.4(syst))×10?? and an upper limit on the product branching fraction for a possible decay with the same final state B(B??a±?(1320)??)×B(a±?(1320)??±???±)±? does not contain the spectator quark and those where it does. We find first evidence of mixing-induced CP violation in B??a±?(1260)?? decays with 3.1? significance. The rate where the a±? does not contain the spectator quark from the B meson is found to dominate the rate where it does at the 4.1? level. However, there is no evidence for either time- and flavor-integrated direct CP violation or flavor-dependent direct CP violation.

  13. BA in CHEMISTRY (692827) MAP Sheet Department of Chemistry and Biochemistry

    E-Print Network [OSTI]

    Olsen Jr., Dan R.

    BA in CHEMISTRY (692827) MAP Sheet Department of Chemistry and Biochemistry For students entering in major courses. --The Chemistry and Biochemistry Department requires the final 10 hours of required chemistry credit to be taken in residence at BYU for this degree program. These hours may also go toward BYU

  14. BA in CHEMISTRY (692827) MAP Sheet Department of Chemistry and Biochemistry

    E-Print Network [OSTI]

    Seamons, Kent E.

    BA in CHEMISTRY (692827) MAP Sheet Department of Chemistry and Biochemistry For students entering Chemistry and Biochemistry Department requires the final 10 hours of required chemistry credit to be taken for graduation. Complete the following: Chem 111* Honors Principles of Chemistry Chem 112 Principles of Chemistry

  15. Synthesis and Structure Determination of Ferromagnetic Semiconductors LaAMnSnO6 (A = Sr Ba)

    SciTech Connect (OSTI)

    T Yang; T Perkisas; J Hadermann; M Croft; A Ignatov; M Greenblatt

    2011-12-31T23:59:59.000Z

    LaAMnSnO{sub 6} (A = Sr, Ba) have been synthesized by high temperature solid-state reactions under dynamic 1% H{sub 2}/Ar flow. Rietveld refinements on room temperature powder X-ray diffraction data indicate that LaSrMnSnO{sub 6} crystallizes in the GdFeO{sub 3}-structure, with space group Pnma and, combined with transmission electron microscopy, LaBaMnSnO{sub 6} in Imma. Both space groups are common in disordered double-perovskites. The Mn{sup 3+} and Sn{sup 4+} ions whose valence states were confirmed by X-ray absorption spectroscopy, are completely disordered over the B-sites and the BO{sub 6} octahedra are slightly distorted. LaAMnSnO{sub 6} are ferromagnetic semiconductors with a T{sub C} = 83 K for the Sr- and 66 K for the Ba-compound. The title compounds, together with the previously reported LaCaMnSnO{sub 6} provide an interesting example of progression from Pnma to Imma as the tolerance factor increases. An analysis of the relationship between space group and tolerance factor for the series LaAMnMO{sub 6} (A = Ca, Sr, Ba; M = Sn, Ru) provides a better understanding of the symmetry determination for double perovskites.

  16. Roadmap: Communication Studies -Applied Communication -Bachelor of Arts CI-BA-COMM-APCO

    E-Print Network [OSTI]

    Khan, Javed I.

    Roadmap: Communication Studies - Applied Communication - Bachelor of Arts CI-BA-COMM-APCO College Semester Eight [14 Credits] COMM 46092 Practicum in Applied Communication 3 C ELR COMM Concentration 39 36 2.250 2.000 #12;Roadmap: Communication Studies - Applied Communication - Bachelor of Arts CI

  17. NetTRUST: mixed NETworks Trust infrastRUcture baSed on Threshold cryptography

    E-Print Network [OSTI]

    Boyer, Edmond

    NetTRUST: mixed NETworks Trust infrastRUcture baSed on Threshold cryptography Mawloud Omar Re and the performance evaluation prove the adequacy of this solution to mixed networks architectures. Keywords to military applications), but the combination of ad-hoc networks with infrastructure based networks

  18. Thermodynamic model for the solubility of BaSeO4(cr) in the aqueous Ba2+-SeO42--Na+-H+-OH--H2O system: Extending to high selenate concentrations

    SciTech Connect (OSTI)

    Rai, Dhanpat; Felmy, Andrew R.; Moore, Dean A.; Kitamura, Akira; Yoshikawa, Hideki; Doi, Reisuke; Yoshida, Yasushi

    2014-09-15T23:59:59.000Z

    The solubility of Ba(SeO4, SO4) precipitates was determined as a function of the BaSeO4 mole fractions, ranging from 0.0015 to 0.3830, and time with an equilibration period extending to as long as 302 days. Equilibrium/steady state conditions in this system are reached in ? 65 days. Pitzer’s ion interaction model was used to calculate solid and aqueous phase activity coefficients. Thermodynamic analyses showed that the data do not satisfy Gibbs-Duhem equation, thereby demonstrating that a single-solid solution phase does not control both the selenate and sulfate concentrations. Our extensive data with log10 [Ba]) ranging from -3.6 to -5.9 mol.kg-1, log10 [SeO4]) ranging from -3.6 to -5.2 mol.kg-1, and log10 [SO4] ranging from -4.0 to -5.3 mol.kg-1 can be explained with the formation of an ideal BaSeO4 solid solution phase that controls the selenium concentrations and a slightly disordered/less-crystalline BaSO4(s) (log10 K0sp = -9.5 instead of -10.05 for barite) that controls the sulfate concentrations. In these experiments the BaSO4 component of the solid solution phase never reaches thermodynamic equilibrium with the aqueous phase. Thermodynamic interpretations of the data show that both the ideal BaSeO4 solid solution phase and less-crystalline BaSO4(s) phase are in equilibrium with each other in the entire range of BaSeO4 mole fractions investigated in this study.

  19. A comparison of crystalline and molten structures of zirconolite (CaZrTi?O?), a potential plutonium wasteform medium, by molecular dynamics simulation and topological analysis

    E-Print Network [OSTI]

    Rich, Sarah Celeste

    2008-01-01T23:59:59.000Z

    Molecular dynamics simulations of the ceramic compound zirconolite (CaZrTi?O?), a potential crystalline wasteform host for plutonium, were carried out for ideal and experimental crystalline forms and a simulated molten ...

  20. Pressure dependence of the superconducting critical temperature of Tl 2Ba 2Ca 2Cu 3O 10 y and Tl 2Ba 2Ca 3Cu 4O12 y up to 21 GPa

    E-Print Network [OSTI]

    Wijngaarden, Rinke J.

    Pressure dependence of the superconducting critical temperature of Tl 2Ba 2Ca 2Cu 3O 10 y and Tl 2 of the superconducting transition temperature Tc of Tl2Ba2Ca2Cu3O10 y Tl-2223 and Tl2Ba2Ca3Cu4O12 y Tl-2234 has been it is determined by that of the inner CuO2 layers. S0163-1829 96 07134-2 I. INTRODUCTION Superconductivity in high

  1. Quasi-zero lattice mismatch and band alignment of BaTiO{sub 3} on epitaxial (110)Ge

    SciTech Connect (OSTI)

    Hudait, M. K.; Zhu, Y.; Jain, N. [Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061 (United States); Maurya, D.; Zhou, Y.; Priya, S [Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, Blacksburg, Virginia 24061 (United States)

    2013-07-14T23:59:59.000Z

    Growth, structural, and band alignment properties of pulsed laser deposited amorphous BaTiO{sub 3} on epitaxial molecular beam epitaxy grown (110)Ge layer, as well as their utilization in low power transistor are reported. High-resolution x-ray diffraction demonstrated quasi-zero lattice mismatch of BaTiO{sub 3} on (110)Ge. Cross-sectional transmission electron microscopy micrograph confirms the amorphous nature of BaTiO{sub 3} layer as well as shows a sharp heterointerface between BaTiO{sub 3} and Ge with no traceable interfacial layer. The valence band offset, {Delta}E{sub v}, of 1.99 {+-} 0.05 eV at the BaTiO{sub 3}/(110)Ge heterointerface is measured using x-ray photoelectron spectroscopy. The conduction band offset, {Delta}E{sub c}, of 1.14 {+-} 0.1 eV is calculated using the bandgap energies of BaTiO{sub 3} of 3.8 eV and Ge of 0.67 eV. These band offset parameters for carrier confinement and the interface chemical properties of the BaTiO{sub 3}/(110)Ge system are significant advancement towards designing Ge-based p-and n-channel metal-oxide semiconductor field-effect transistors for low-power application.

  2. Brazing ZrO{sub 2} ceramic to Ti–6Al–4V alloy using NiCrSiB amorphous filler foil: Interfacial microstructure and joint properties

    SciTech Connect (OSTI)

    Cao, J., E-mail: cao_jian@hit.edu.cn [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Song, X.G., E-mail: song_xiaoguohit@yahoo.com.cn [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Li, C., E-mail: li_chun1989@yahoo.cn [State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Zhao, L.Y., E-mail: Zhao_ly@163.com [State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Feng, J.C., E-mail: feng_jicai@163.com [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China)

    2013-07-15T23:59:59.000Z

    Reliable brazing of ZrO{sub 2} ceramic and Ti–6Al–4V alloy was achieved using NiCrSiB amorphous filler foil. The interfacial microstructure of ZrO{sub 2}/Ti–6Al–4V joints was characterized by scanning electron microscope, energy dispersive spectrometer and micro-focused X-ray diffractometer. The effects of brazing temperature on the interfacial microstructure and joining properties of brazed joints were investigated in detail. Active Ti of Ti–6Al–4V alloy dissolved into molten filler metal and reacted with ZrO{sub 2} ceramic to form a continuous TiO reaction layer, which played an important role in brazing. Various reaction phases including Ti{sub 2}Ni, Ti{sub 5}Si{sub 3} and ?-Ti were formed in brazed joints. With an increasing of brazing temperature, the TiO layer thickened gradually while the Ti{sub 2}Ni amount reduced. Shear test indicated that brazed joints tend to fracture at the interface between ZrO{sub 2} ceramic and brazing seam or Ti{sub 2}Ni intermetallic layer. The maximum average shear strength reached 284.6 MPa when brazed at 1025 °C for 10 min. - Graphical Abstract: Interfacial microstructure of ZrO{sub 2}/TC4 joint brazed using NiCrSiB amorphous filler foil was: ZrO{sub 2}/TiO/Ti{sub 2}Ni + ?-Ti + Ti{sub 5}Si{sub 3}/?-Ti/Widmanstätten structure/TC4. - Highlights: • Brazing of ZrO{sub 2} ceramic and Ti-6Al-4V alloy was achieved. • Interfacial microstructure was TiO/Ti{sub 2}Ni + ? + Ti{sub 5}Si{sub 3}/?/Widmanstätten structure. • The formation of TiO produced the darkening effect of ZrO{sub 2} ceramic. • The highest joining strength of 284.6MPa was obtained.

  3. Synthesis, structural and magnetic characterisation of the fully fluorinated compound 6H-BaFeO{sub 2}F

    SciTech Connect (OSTI)

    Clemens, Oliver, E-mail: oliverclemens@online.de [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)] [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom); Wright, Adrian J.; Berry, Frank J. [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)] [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom); Smith, Ronald I. [ISIS Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX (United Kingdom)] [ISIS Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX (United Kingdom); Slater, Peter R. [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)] [School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)

    2013-02-15T23:59:59.000Z

    The compound 6H-BaFeO{sub 2}F (P6{sub 3}/mmc) was synthesised by the low temperature fluorination of 6H-BaFeO{sub 3-d} using polyvinylidenedifluoride (PVDF) as a fluorination agent. Structural characterisation by XRD and NPD suggests that the local positions of the oxygen and fluorine atoms vary with no evidence for ordering on the anion sites. This compound shows antiferromagnetic ordering at room temperature with antiparallel alignment of the magnetic moments along the c-axis. The use of PVDF also allows the possibility of tuning the fluorine content in materials of composition 6H-BaFeO{sub 3-d}F{sub y} to any value of 0BaFeO{sub 2}F. Highlights: Black-Right-Pointing-Pointer The crystal structure of the hexagonal perovskite phase 6H-BaFeO{sub 2}F. Black-Right-Pointing-Pointer H-BaFeO{sub 2}F and 6H-BaFeO{sub 3-d}F{sub y} were prepared via low temperature fluorination using PVDF. Black-Right-Pointing-Pointer A structural investigation of the compounds BaFeO{sub 2}F is presented in detail. Black-Right-Pointing-Pointer This analysis suggests differences for the local coordination of O{sup 2-} and F{sup -} anions. Black-Right-Pointing-Pointer H-BaFeO{sub 2}F shows antiferromagnetic ordering at 300 K. Black-Right-Pointing-Pointer The magnetic moments align parallel to the a-axis.

  4. Characterization of self-propagating formation reactions in Ni/Zr multilayered foils using reaction heats, velocities, and temperature-time profiles

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Barron, S. C.; Knepper, R.; Walker, N.; Weihs, T. P.

    2011-01-11T23:59:59.000Z

    We report on intermetallic formation reactions in vapor-deposited multilayered foils of Ni/Zr with 70 nm bilayers and overall atomic ratios of Ni:Zr, 2 Ni:Zr, and 7 Ni:2 Zr. The sequence of alloy phase formation and the stored energy is evaluated at slow heating rates (~1 K/s) using differential scanning calorimetry (DSC) traces to 725ºC. All three chemistries initially form a Ni-Zr amorphous phase which crystallizes first to the intermetallic NiZr. The heat of reaction to the final phase is 34-36 kJ/mol atom for all chemistries. Intermetallic formation reactions are also studied at rapid heating rates (greater than 105 K/s) in high temperature, self-propagating reactions which can be ignited in these foils by an electric spark. We find that reaction velocities and maximum reaction temperatures (Tmax) are largely independent of foil chemistry at 0.6 ± 0.1 m/s and 1220 ± 50 K, respectively, and that the measured Tmax is more than 200 K lower than predicted adiabatic temperatures (Tad). The difference between Tmax and Tad is explained by the prediction that transformation to the final intermetallic phases occurs after Tmax and results in the release of 20-30 % of the total heat of reaction and a delay in rapid cooling.

  5. Behavior of the electroless composite films plated from a Ni-P bath with metallic dispersion of Zr and Nb powders

    SciTech Connect (OSTI)

    Osaka, T.; Koiwa, I.; Usuda, M.; Arai, K.; Saito, I.

    1989-04-01T23:59:59.000Z

    An electroless Ni-Zr-P composite film and a Ni-Nb-P composite film were plated and their heat-treating behaviors were investigated. The addition of 20g dm/sup -3/ of metallic powder resulted in a composite film that contained 21.2 weight percent (w/o) of Zr. (13.8 atom percent (a/o)), or 4.8 w/o of Nb. (2.9 a/o), respectively. Both metallic powders were dispersed uniformly throughout the film. The metallic Ni formed by the crystallization on the Ni-P matrix diffused into the metallic powders, and the amorphous Ni-Zr and Ni-Nb phases were formed by heat-treatment at 500/sup 0/ or 300/sup 0/C. Some parts of the amorphous Ni-Zr phases and the metallic Ni phases combined to form intermetallic compounds by heat-treatment at 600/sup 0/C. The nickel-rich parts of the amorphous Ni-Nb phase were converted into a metastable Ni-Nb phase (zeta phase) or a Ni-Nb solid solution by heat-treatment at 700/sup 0/C. The longer heating time at 400/sup 0/C increased the amount of the Ni-Zr amorphous phase: however, it decreased the reactivity of the amorphous Ni-Zr phase. The same heat-treatment of 400/sup 0/C did not give the considerable change on the amorphous Ni-Nb phase.

  6. Characterization of self-propagating formation reactions in Ni/Zr multilayered foils using reaction heats, velocities, and temperature-time profiles

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Barron, S. C.; Knepper, R.; Walker, N.; Weihs, T. P.

    2011-01-11T23:59:59.000Z

    We report on intermetallic formation reactions in vapor-deposited multilayered foils of Ni/Zr with 70 nm bilayers and overall atomic ratios of Ni:Zr, 2 Ni:Zr, and 7 Ni:2 Zr. The sequence of alloy phase formation and the stored energy is evaluated at slow heating rates (~1 K/s) using differential scanning calorimetry (DSC) traces to 725ºC. All three chemistries initially form a Ni-Zr amorphous phase which crystallizes first to the intermetallic NiZr. The heat of reaction to the final phase is 34-36 kJ/mol atom for all chemistries. Intermetallic formation reactions are also studied at rapid heating rates (greater than 105 K/s) inmore »high temperature, self-propagating reactions which can be ignited in these foils by an electric spark. We find that reaction velocities and maximum reaction temperatures (Tmax) are largely independent of foil chemistry at 0.6 ± 0.1 m/s and 1220 ± 50 K, respectively, and that the measured Tmax is more than 200 K lower than predicted adiabatic temperatures (Tad). The difference between Tmax and Tad is explained by the prediction that transformation to the final intermetallic phases occurs after Tmax and results in the release of 20-30 % of the total heat of reaction and a delay in rapid cooling.« less

  7. Synthesis, structural and magnetic characterisation of the fluorinated compound 15R-BaFeO{sub 2}F

    SciTech Connect (OSTI)

    Clemens, Oliver, E-mail: oliverclemens@online.de [School of Chemistry, The University of Birmingham, Birmingham B15 2TT (United Kingdom); Berry, Frank J. [School of Chemistry, The University of Birmingham, Birmingham B15 2TT (United Kingdom); Bauer, Jessica [Anorganische Festkörperchemie, Universität des Saarlandes, Am Markt, Zeile 3, 66125 Saarbrücken (Germany); Wright, Adrian J. [School of Chemistry, The University of Birmingham, Birmingham B15 2TT (United Kingdom); Knight, Kevin S. [ISIS Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX (United Kingdom); Slater, Peter R. [School of Chemistry, The University of Birmingham, Birmingham B15 2TT (United Kingdom)

    2013-07-15T23:59:59.000Z

    The compounds 15R-BaFeO{sub 2}F and 15R-BaFeO{sub 2.27}F{sub 0.5} have been synthesised by the low temperature fluorination of 15R-BaFeO{sub 3?d}F{sub 0.2} using polyvinylidenedifluoride (PVDF) as a fluorination agent. The materials have been structurally characterised by Rietveld analysis of the X-ray- and HRPD-powder neutron diffraction data. A detailed analysis of bond valence sums suggests that the oxide and fluoride ions order on the different anion sites. A reinvestigation of our recently published structure (Clemens et al., 2013) [34] of 6H-BaFeO{sub 2}F is also reported and incorporation of fluoride in h-type layers is also confirmed in this compound. The magnetic moments for 15R-BaFeO{sub 2}F and 15R-BaFeO{sub 2.25}F{sub 0.5} align in the a/b-plane with antiferromagnetic alignment of the moments between adjacent layers, and are flipped by 90° as compared to the precursor compound. 15R-BaFeO{sub 2}F exhibits very robust antiferromagnetism with a Néel temperature between 300 and 400 °C. - Graphical abstract: The crystal and magnetic structure of the perovskite phase 15R-BaFeO{sub 2}F. - Highlights: • 15R-BaFeO{sub 2}F and 15R-BaFeO{sub 2.27}F{sub 0.5}were prepared via low temperature fluorination using PVDF. • A structural investigation of the compounds BaFeO{sub 2}F is presented in detail. • This analysis suggests ordering of O{sup 2?} and F{sup ?} anions between different layers. • 15R-BaFeO{sub 2}F shows antiferromagnetic ordering at 300 K with T{sub N} ?300–400 °C. • The magnetic moments align in the a/b-plane.

  8. Molten salt synthesis of anisometric particles in the SrONb2O5BaO system

    E-Print Network [OSTI]

    Messing, Gary L.

    Molten salt synthesis of anisometric particles in the SrO­Nb2O5­BaO system Cihangir Duran* , Gary L.5Ba0.5Nb2O6, and SrNb2O6 were synthesized in the SrO­BaO­Nb2O5 system, using KCl or SrCl2Á6H2O salts the salt and Nb2O5. Large, irregularly shaped (Sr-rich) Sr2Nb2O7 particles formed with increasing reaction

  9. Vertical Profiles Of {sup 226}Ra, {sup 232}Th And {sup 40}K Activities In Rocks From The Irati Formation Of The Parana Sedimentary Basin, Southern Brazil

    SciTech Connect (OSTI)

    Ferreira, Ademar de O.; Bastos, Rodrigo O.; Appoloni, Carlos R. [Laboratorio de Fisica Nuclear Aplicada-Departamento de Fisica-CCE Universidade Estadual de Londrina-Campus Universitario Rodovia Celso Garcia Cid s/n, Cx. Postal 6001 86051-990 Londrina (Puerto Rico)

    2008-08-07T23:59:59.000Z

    Naturally occurring radioisotopes are present in different concentrations in sedimentary rocks, reflecting the origin of the sediments, the depositional environment, and more recent events such as weathering and erosion. Using a high-resolution {gamma}-ray spectrometry methodology, sedimentary rocks were measured to assess the concentration activities of the natural radioisotopes. The surveyed rocks are from the Irati formation in the Parana sedimentary basin, which are exposed by an abandoned, open-pit limestone mine, in the city of Sapopema, southern Brazil. The exposed vertical profile is 5 m, and its stratigraphy is represented by an alternation of limestone and bituminous shale (layers being a few decimeters thick), and some millimeter rhythm layers with limestone and bituminous shale laminas. Eleven samples were collected along this profile, each of them dried in the open air during 48 hours, sieved through 4 mm mesh and sealed in cylindrical recipients. Measurements were accomplished using a 66% relative efficiency HPGE detector connected to a standard gamma ray spectrometry electronic chain. The detector efficiency in the range of 60 to 1800 keV was carried out with the certified IAEA-385 sediment sample. The Lower Limit of Detection (LLD) to the system is 2.40 Bq{center_dot}kg{sup -1} for {sup 226}Ra, 1.84 Bq{center_dot}kg{sup -1} for {sup 232}Th and 4.20 Bq{center_dot}kg{sup -1} for {sup 40}K. Activity concentrations were determined for {sup 226}Ra (from 16.22 to 151.55 Bq{center_dot}kg{sup -1}), {sup 232}Th (from 2.93 to 56.12 Bq{center_dot}kg{sup -1}) and {sup 40}K (from 38.45 to 644.63 Bq{center_dot}kg{sup -1}). The layers enriched with organic matter presented the higher values of activity. The measured concentrations of the natural radioisotopes were lower for limestone samples (average values and respective deviations were 22.81{+-}0.22 Bq{center_dot}kg{sup -1} for {sup 226}Ra, 4.21{+-}0.07 Bq{center_dot}kg{sup -1} for {sup 232}Th, and 50.11{+-}0.82 Bq{center_dot}kg{sup -1} for {sup 40}K). Higher concentrations were measured for the bituminous shale samples (average values and respective deviations were 108.10{+-}12.17 Bq{center_dot}kg{sup -1} for {sup 226}Ra, 43.69{+-}0.30 Bq{center_dot}kg{sup -1} for {sup 232}Th, and 465.82{+-}3.99 Bq{center_dot}kg{sup -1} for {sup 40}K). The concentrations were intermediate for the rhythmite samples (average values and respective deviations were 50.69{+-}1.09 Bq{center_dot}kg{sup -1} for {sup 226}Ra, 7.63{+-}0.21 Bq{center_dot}kg{sup -1} for {sup 232}Th, and 85.96{+-}2.47 Bq{center_dot}kg{sup -1} for {sup 40}K). As the analyzed rocks are raw materials for the ceramic, cement and soil correction compound industries, the results of this work furnish data to estimate the contribution of these products to the general public's radiation exposure.

  10. Thermal conductivity profile determination in proton-irradiated ZrC by spatial and frequency scanning thermal wave methods

    SciTech Connect (OSTI)

    Jensen, C. [GRESPI, Multiscale Thermophysics Lab., Université de Reims Champagne-Ardenne URCA, Moulin de la Housse BP 1039, Reims 51687 (France) [GRESPI, Multiscale Thermophysics Lab., Université de Reims Champagne-Ardenne URCA, Moulin de la Housse BP 1039, Reims 51687 (France); Department of Mechanical and Aerospace Engineering, Utah State University, Logan, Utah 84322 (United States); Chirtoc, M.; Horny, N.; Antoniow, J. S.; Pron, H. [GRESPI, Multiscale Thermophysics Lab., Université de Reims Champagne-Ardenne URCA, Moulin de la Housse BP 1039, Reims 51687 (France)] [GRESPI, Multiscale Thermophysics Lab., Université de Reims Champagne-Ardenne URCA, Moulin de la Housse BP 1039, Reims 51687 (France); Ban, H. [Department of Mechanical and Aerospace Engineering, Utah State University, Logan, Utah 84322 (United States)] [Department of Mechanical and Aerospace Engineering, Utah State University, Logan, Utah 84322 (United States)

    2013-10-07T23:59:59.000Z

    Using complementary thermal wave methods, the irradiation damaged region of zirconium carbide (ZrC) is characterized by quantifiably profiling the thermophysical property degradation. The ZrC sample was irradiated by a 2.6 MeV proton beam at 600 °C to a dose of 1.75 displacements per atom. Spatial scanning techniques including scanning thermal microscopy (SThM), lock-in infrared thermography (lock-in IRT), and photothermal radiometry (PTR) were used to directly map the in-depth profile of thermal conductivity on a cross section of the ZrC sample. The advantages and limitations of each system are discussed and compared, finding consistent results from all techniques. SThM provides the best resolution finding a very uniform thermal conductivity envelope in the damaged region measuring ?52 ± 2 ?m deep. Frequency-based scanning PTR provides quantification of the thermal parameters of the sample using the SThM measured profile to provide validation of a heating model. Measured irradiated and virgin thermal conductivities are found to be 11.9 ± 0.5 W m{sup ?1} K{sup ?1} and 26.7 ±1 W m{sup ?1} K{sup ?1}, respectively. A thermal resistance evidenced in the frequency spectra of the PTR results was calculated to be (1.58 ± 0.1) × 10{sup ?6} m{sup 2} K W{sup ?1}. The measured thermal conductivity values compare well with the thermal conductivity extracted from the SThM calibrated signal and the spatially scanned PTR. Combined spatial and frequency scanning techniques are shown to provide a valuable, complementary combination for thermal property characterization of proton-irradiated ZrC. Such methodology could be useful for other studies of ion-irradiated materials.

  11. Assessment of a mechanistic model in U-Pu-Zr metallic alloy fuel fission-gas behavior simulations

    SciTech Connect (OSTI)

    Yun, D.; Rest, J.; Yacout, A. M. [Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)

    2012-07-01T23:59:59.000Z

    A mechanistic kinetic rate theory model originally developed for the prediction of fission gas behavior in oxide nuclear fuels under steady-state and transient conditions has been assessed to look at its applicability to model fission gas behavior in U-Pu-Zr metallic alloy fuel. In order to capture and validate the underlying physics for irradiated U-Pu-Zr fuels, the mechanistic model was applied to the simulation of fission gas release, fission gas and fission product induced swelling, and the evolution of the gas bubble size distribution in three different fuel zones: the outer {alpha}-U, the intermediate, and the inner {gamma}-U zones. Due to its special microstructural features, the {alpha}-U zone in U-Pu-Zr fuels is believed to contribute the largest fraction of fission gas release among the different fuel zones. It is shown that with the use of small effective grain sizes, the mechanistic model can predict fission gas release that is consistent with (though slightly lower than) experimentally measured data. These simulation results are comparable to the experimentally measured fission gas release since the mechanism of fission gas transport through the densely distributed laminar porosity in the {alpha}-U zone is analogous to the mechanism of fission gas transport through the interconnected gas bubble porosity utilized in the mechanistic model. Detailed gas bubble size distributions predicted with the mechanistic model in both the intermediate zone and the high temperature {gamma}-U zone of U-Pu-Zr fuel are also compared to experimental measurements from available SEM micrographs. These comparisons show good agreements between the simulation results and experimental measurements, and therefore provide crucial guidelines for the selection of key physical parameters required for modeling these two zones. In addition, the results of parametric studies for several key parameters are presented for both the intermediate zone and the {gamma}-U zone simulations. (authors)

  12. Diffusion Barrier Selection from Refractory Metals (Zr, Mo and Nb) via Interdiffusion Investigation for U-Mo RERTR Fuel Alloy

    SciTech Connect (OSTI)

    K. Huang; C. Kammerer; D. D. Keiser, Jr.; Y. H. Sohn

    2014-04-01T23:59:59.000Z

    U-Mo alloys are being developed as low enrichment monolithic fuel under the Reduced Enrichment for Research and Test Reactor (RERTR) Program. Diffusional interactions between the U-Mo fuel alloy and Al-alloy cladding within the monolithic fuel plate construct necessitate incorporation of a barrier layer. Fundamentally, a diffusion barrier candidate must have good thermal conductivity, high melting point, minimal metallurgical interaction, and good irradiation performance. Refractory metals, Zr, Mo, and Nb are considered based on their physical properties, and the diffusion behavior must be carefully examined first with U-Mo fuel alloy. Solid-to-solid U-10wt.%Mo vs. Mo, Zr, or Nb diffusion couples were assembled and annealed at 600, 700, 800, 900 and 1000 degrees C for various times. The interdiffusion microstructures and chemical composition were examined via scanning electron microscopy and electron probe microanalysis, respectively. For all three systems, the growth rate of interdiffusion zone were calculated at 1000, 900 and 800 degrees C under the assumption of parabolic growth, and calculated for lower temperature of 700, 600 and 500 degrees C according to Arrhenius relationship. The growth rate was determined to be about 10 3 times slower for Zr, 10 5 times slower for Mo and 10 6 times slower for Nb, than the growth rates reported for the interaction between the U-Mo fuel alloy and pure Al or Al-Si cladding alloys. Zr, however was selected as the barrier metal due to a concern for thermo- mechanical behavior of UMo/Nb interface observed from diffusion couples, and for ductile-to-brittle transition of Mo near room temperature.

  13. Dynamic study on fusion reactions for $^{40,48}$Ca+$^{90,96}$Zr around Coulomb barrier

    E-Print Network [OSTI]

    Ning Wang; Xizhen Wu; Zhuxia Li

    2003-01-09T23:59:59.000Z

    By using the updated improved Quantum Molecular Dynamics model in which a surface-symmetry potential term has been introduced for the first time, the excitation functions for fusion reactions of $^{40,48}$Ca+$^{90,96}$Zr at energies around the Coulomb barrier have been studied. The experimental data of the fusion cross sections for $^{40}$Ca+$^{90,96}$Zr have been reproduced remarkably well without introducing any new parameters. The fusion cross sections for the neutron-rich fusion reactions of $^{48}$Ca+$^{90,96}$Zr around the Coulomb barrier are predicted to be enhanced compared with a non-neutron-rich fusion reaction. In order to clarify the mechanism of the enhancement of the fusion cross sections for neutron-rich nuclear fusions, we pay a great attention to study the dynamic lowering of the Coulomb barrier during a neck formation. The isospin effect on the barrier lowering is investigated. It is interesting that the effect of the projectile and target nuclear structure on fusion dynamics can be revealed to a certain extent in our approach. The time evolution of the N/Z ratio at the neck region has been firstly illustrated. A large enhancement of the N/Z ratio at neck region for neutron-rich nuclear fusion reactions is found.

  14. Ab initio molecular dynamics simulations of properties of a-Al2O3 /vacuum and a-ZrO2 /vacuum vs a-Al2O3/Ge,,100...,,21...

    E-Print Network [OSTI]

    Kummel, Andrew C.

    -Al2O3/Ge,,100...,,2Ã1... and a-ZrO2/Ge,,100...,,2Ã1... interfaces Evgueni A. Chagarova and Andrew C The local atomic structural properties of a-Al2O3, a-ZrO2 vacuum/oxide surfaces, and a-Al2O3/Ge 100 2 1 , a-ZrO2/Ge 100 2 1 oxide/semiconductor interfaces were investigated by density-functional theory DFT

  15. The elastic and piezoelectric properties of tungsten bronze ferroelectric crystals ,,Sr0.7Ba0.3...2NaNb5O15 and ,,Sr0.3Ba0.7...2NaNb5O15

    E-Print Network [OSTI]

    Cao, Wenwu

    The elastic and piezoelectric properties of tungsten bronze ferroelectric crystals ,,Sr0.7Ba0 and piezoelectric constants of tungsten bronze ferroelectric crystals Sr0.7Ba0.3 2NaNb5O15 SBNN70 and Sr0.3Ba0.7 2Na. INTRODUCTION Ferroelectric crystals with tungsten bronze structure are another attractive family beside

  16. Data:209b4880-04bc-4f18-9295-39ba0506f055 | Open Energy Information

    Open Energy Info (EERE)

    f18-9295-39ba0506f055 No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading... 1. Basic...

  17. Infrared-optical spectroscopy of transparent conducting perovskite (La,Ba)SnO{sub 3} thin films

    SciTech Connect (OSTI)

    Seo, Dongmin; Yu, Kwangnam; Jun Chang, Young; Choi, E. J., E-mail: echoi@uos.ac.kr [Department of Physics, University of Seoul, Seoul 130-743 (Korea, Republic of); Sohn, Egon; Hoon Kim, Kee [Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)

    2014-01-13T23:59:59.000Z

    We have performed optical transmission, reflection, spectroscopic ellipsometry, and Hall effect measurements on the electron-doped La{sub x}Ba{sub 1–x}SnO{sub 3} (x?=?0.04) transparent thin films. From the infrared Drude response and plasma frequency analysis we determine the effective mass of the conducting electron m*?=?0.35m{sub 0}. In the visible-UV region the optical band gap shifts to high energy in (La,Ba)SnO{sub 3} by 0.18?eV compared with undoped BaSnO{sub 3} which, in the context of the Burstein-Moss analysis, is consistent with the infrared-m*. m* of BaSnO{sub 3} is compared with other existing transparent conducting oxides (TCO), and implication on search for high-mobility TCO compounds is discussed.

  18. Superconductivity at 34 K in the K/Ba/Bi/O system

    SciTech Connect (OSTI)

    Jones, N.L.; Parise, J.B.; Flippen, R.B.; Sleight, A.W. (E.I. DuPont de Nemours and Co., Wilmington, DE (USA))

    1989-02-01T23:59:59.000Z

    The critical temperature for superconductivity in the (Ba, K)BiO{sub 3} system has been increased to 34 K. With each such increase of T{sub c} in a system containing no copper it becomes increasingly likely that the mechanisms for superconductivity in the Bi-based and the Cu-based oxide superconductors are very closely related to each other. Since the (Ba, K)BiO{sub 3} superconductors possess the cubic perovskite structure, the mechanism for high T{sub c} would then not related directly to the two-dimensional character of the copper oxide superconductors or to the magnetism in such systems. 12 refs., 1 fig.

  19. User Defined Data in the New Analysis Model of the BaBar Experiment

    SciTech Connect (OSTI)

    De Nardo, G.

    2005-04-06T23:59:59.000Z

    The BaBar experiment has recently revised its Analysis Model. One of the key ingredient of BaBar new Analysis Model is the support of the capability to add to the Event Store user defined data, which can be the output of complex computations performed at an advanced stage of a physics analysis, and are associated to analysis objects. In order to provide flexibility and extensibility with respect to object types, template generic programming has been adopted. In this way the model is non-intrusive with respect to reconstruction and analysis objects it manages, not requiring changes in their interfaces and implementations. Technological details are hidden as much as possible to the user, providing a simple interface. In this paper we present some of the limitations of the old model and how they are addressed by the new Analysis Model.

  20. Optical properties of Pr-doped BaY{sub 2}F{sub 8}

    SciTech Connect (OSTI)

    Andrade, Adriano B., E-mail: abandrade1@gmail.com; Mello, Ana C. S. de; Valerio, Mário E. G. [Physics Department, Federal University of Sergipe, 49100-000 São Cristovão, SE (Brazil); Rezende, Marcos V. dos S. [Physics Department, Federal University of Sergipe, 49500-000 Itabaiana, SE (Brazil); Baldochi, Sonia L. [IPEN-CNEN/SP, CEP 11049, 05422-970 São Paulo, SP (Brazil)

    2014-08-07T23:59:59.000Z

    Crystalline samples of Pr-doped BaY{sub 2}F{sub 8} (BaYF) were prepared by zone melting technique. The pure phase obtained was identified by X-ray diffraction measurement. Optical absorption result was evaluated and it showed that the formation of the absorption bands can be connected to color centers generated by radiation in the matrix. Radioluminescence emission measurements after excitation by X-ray showed that the material exhibited components responsible for long lasting phosphorescence. Short decay times were also evaluated, the measurements showed a fast component around 70?ns associated to the 4f{sup 1}5d{sup 1} ? 4f{sup 2} transition of the Pr{sup 3+} ion. The Thermoluminescence (TL) results indicate the presence of two trapping centers.

  1. Zinc ferrite nanoparticles as MRI contrast agentsw Carlos Ba rcena,a

    E-Print Network [OSTI]

    Gao, Jinming

    Zinc ferrite nanoparticles as MRI contrast agentsw Carlos Ba´ rcena,a Amandeep K. Sra,a Girija S, a series of spinel-structured ferrites, MFe2O4 (M = Mn2+ , Fe2+ , Co2+ , Ni2+ ), were reported as novel MRI.e., Mn2+ occupies both A and B sites), whereas the other metal ferrites have an inverse spinel structure

  2. Lifshitz Transition and Chemical Instabilities in Ba1 xKxFe2As2 Superconductors

    SciTech Connect (OSTI)

    Khan, Suffian N. [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign; Johnson, Duane D. [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign

    2014-01-01T23:59:59.000Z

    Forsolid-solutionBa1 xKxFe2As2FermisurfaceevolutionismappedviaBlochspectralfunctionscalculatedusingdensityfunctionaltheoryimplementedinKorringa-Kohn-Rostokermultiplescatteringtheorywiththecoherent-potentialapproximation.Spectralfunctionsrevealelectronicdispersion,topology,orbitalcharacter,andbroadening(electron-lifetimeeffects)duetochemicaldisorder.Dissolutionofelectroncylindersoccursnearx 0.9withanonuniform,topological(Lifshitz)transition,reducingtheinterbandinteractions;yetthedispersionmaintainsitsdxzordyzcharacter.Formationenergiesindicatealloyingatx 0.35,asobserved,andatendencyforsegregationontheK-rich(x>0.6)side,explainingthedifficultyofcontrollingsamplequalityandtheconflictingresultsbetweencharacterizedelectronicstructures.OurresultsrevealFermisurfacetransitionsinalloyedsamplesthatinfluencestonodalsuperconductivityandsuggesttheoriginfordeviationsofcommontrendsinFe-basedsuperconductors,suchasBud ko-Ni-Canfieldscaling.

  3. Observation of the chiral magnetic effect in ZrTe5

    E-Print Network [OSTI]

    Qiang Li; Dmitri E. Kharzeev; Cheng Zhang; Yuan Huang; I. Pletikosic; A. V. Fedorov; R. D. Zhong; J. A. Schneeloch; G. D. Gu; T. Valla

    2014-12-19T23:59:59.000Z

    The chiral magnetic effect is the generation of electric current induced by chirality imbalance in the presence of magnetic field. It is a macroscopic manifestation of the quantum anomaly in relativistic field theory of chiral fermions (massless spin $1/2$ particles with a definite projection of spin on momentum) -- a dramatic phenomenon arising from a collective motion of particles and antiparticles in the Dirac sea. The recent discovery of Dirac semimetals with chiral quasi-particles opens a fascinating possibility to study this phenomenon in condensed matter experiments. Here we report on the first observation of chiral magnetic effect through the measurement of magneto-transport in zirconium pentatelluride, ZrTe_5. Our angle-resolved photoemission spectroscopy experiments show that this material's electronic structure is consistent with a 3D Dirac semimetal. We observe a large negative magnetoresistance when magnetic field is parallel with the current. The measured quadratic field dependence of the magnetoconductance is a clear indication of the chiral magnetic effect. The observed phenomenon stems from the effective transmutation of Dirac semimetal into a Weyl semimetal induced by the parallel electric and magnetic fields that represent a topologically nontrivial gauge field background.

  4. Hydrostatic pressure (8 GPa) dependence of electrical resistivity of BaCo{sub 2}As{sub 2} single crystal

    SciTech Connect (OSTI)

    Ganguli, Chandreyee; Matsubayashi, Kazuyuki; Ohgushi, Kenya [Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan); Uwatoko, Yoshiya, E-mail: uwatoko@issp.u-tokyo.ac.jp [Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan); Kanagaraj, Moorthi [Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024 (India); Arumugam, Sonachalam, E-mail: sarumugam1963@yahoo.com [Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024 (India)

    2013-10-15T23:59:59.000Z

    Graphical abstract: - Highlights: • Single crystals of BaCo{sub 2}As{sub 2} were grown by CoAs self-flux method. • We have studied pressure effects (8 GPa) on dc electrical resistivity of BaCo{sub 2}As{sub 2}. • On applied external pressure BaCo{sub 2}As{sub 2} remains a metallic state up to 8 GPa. • Superconductivity is absent in BaCo{sub 2}As{sub 2} because of its proximity to ferromagnetism. - Abstract: The pressure dependence of the electrical resistivity of BaCo{sub 2}As{sub 2} single crystal as a function of temperature was measured at ambient and high pressures up to 8 GPa for the first time using cubic anvil high pressure cell. It is observed that at room temperature the resistivity monotonically decreases with increasing pressure and it remains in the metallic state even at an applied pressure of 8 GPa. From the temperature dependence of the resistivity measurements under pressure, we found that superconductivity is absent up to 8 GPa. The value of the electron's scattering factor (A) is found to be large at ambient pressure and it decreases with the application of pressure, indicating that the substantial electron correlation effect of BaCo{sub 2}As{sub 2} is reduced under pressure, revealing a dramatic change of density of states at the Fermi energy.

  5. Two- and Three-Body Charmless B Decays at BaBar

    SciTech Connect (OSTI)

    Stracka, Simone; /Milan U. /INFN, Milan; ,

    2012-04-05T23:59:59.000Z

    We report recent measurements of rare charmless B decays performed by BaBar. The results are based on the final BaBar dataset of 424 fb{sup -1} collected at the PEP-II B-factory based at the SLAC National Accelerator Laboratory. The study of rare B decays is a key ingredient to meet two of the main goals of the B-factories: assessing the validity of the Cabibbo-Kobayashi-Maskawa (CKM) picture of CP-violation by precisely measuring the elements of the Unitarity Triangle (UT), and searching for hints of New Physics (NP), or otherwise constraining NP scenarios, in processes which are suppressed in the Standard Model (SM). In loop processes, in particular, NP at some higher energy scale may manifest itself in the low energy effective theory as new couplings, such as those introduced by new very massive virtual particles in the loop. In NP searches hadronic uncertainties can play a major role, expecially for branching fraction measurements. Many theoretical uncertainties cancel in ratios of amplitudes, and most NP probes are therefore of this kind. In the following sections we report recent measurements, performed by the BaBar Collaboration, that are relevant to NP searches in charmless hadronic B decays.

  6. The new barium zinc mercurides Ba{sub 3}ZnHg{sub 10} and BaZn{sub 0.6}Hg{sub 3.4} - Synthesis, crystal and electronic structure

    SciTech Connect (OSTI)

    Schwarz, Michael; Wendorff, Marco [Institut fuer Anorganische und Analytische Chemie, University of Freiburg, Albertstr. 21, D-79104 Freiburg (Germany)] [Institut fuer Anorganische und Analytische Chemie, University of Freiburg, Albertstr. 21, D-79104 Freiburg (Germany); Roehr, Caroline, E-mail: caroline@ruby.chemie.uni-freiburg.de [Institut fuer Anorganische und Analytische Chemie, University of Freiburg, Albertstr. 21, D-79104 Freiburg (Germany)] [Institut fuer Anorganische und Analytische Chemie, University of Freiburg, Albertstr. 21, D-79104 Freiburg (Germany)

    2012-12-15T23:59:59.000Z

    The title compounds Ba{sub 3}ZnHg{sub 10} and BaZn{sub 0.6}Hg{sub 3.4} were synthesized from stoichiometric ratios of the elements in Ta crucibles. Their crystal structures, which both represent new structure types, have been determined using single crystal X-ray data. The structure of Ba{sub 3}ZnHg{sub 10} (orthorhombic, oP28, space group Pmmn, a=701.2(3), b=1706.9(8), c=627.3(3)pm, Z=2, R1=0.0657) contains folded 4{sup 4} Hg nets, where the meshes form the bases of flat rectangular pyramids resembling the structure of BaAl{sub 4}. The flat pyramids are connected via Hg-Zn/Hg bonds, leaving large channels at the folds, in which Ba(1) and Hg(2) atoms alternate. Whereas the remaining Hg/Zn atoms form a covalent 3D network of three- to five-bonded atoms with short M-M distances (273-301 pm; CN 9-11), the Hg(2) atoms in the channels adopt a comparatively large coordination number of 12 and increased distances (317-348 pm) to their Zn/Hg neighbours. In the structure of BaZn{sub 0.6}Hg{sub 3.4} (cubic, cI320, space group I4{sup Macron }3d, a=2025.50(7) pm, Z=64, R1=0.0440), with a chemical composition not much different from that of Ba{sub 3}ZnHg{sub 10}, the Zn/Hg atoms of the mixed positions M(1/2) are arranged in an slightly distorted primitive cubic lattice with a 4 Multiplication-Sign 4 Multiplication-Sign 4 subcell relation to the unit cell. The 24 of the originating 64 cubes contain planar cis tetramers Hg(5,6){sub 4} with Hg in a nearly trigonal planar or tetrahedral coordination. In another 24 of the small cubes, two opposing faces are decorated by Hg(3,4){sub 2} dumbbells, two by Ba(2) atoms respectively. The third type of small cubes are centered by Ba(1) atoms only. The complex 3D polyanionic Hg/Zn network thus formed is compared with the Hg partial structure in Rb{sub 3}Hg{sub 20} applying a group-subgroup relation. Despite their different overall structures, the connectivity of the negatively charged Hg atoms, the rather metallic Zn bonding characteristic (as obtained from FP-LAPW band structure calculations) and the coordination number of 16 for all Ba cations relate the two title compounds. - Graphical abstract: Six of the 64 small sub-cubes of three types (A, B, C) forming the unit cell of the Hg-rich mercuride BaZn{sub 0.6}Hg{sub 3.4}. Highlights: Black-Right-Pointing-Pointer Two new Hg-rich Ba mercurides, both synthesized from the elements in pure phase. Black-Right-Pointing-Pointer BaZn{sub 0.6}HgG{sub 3.4} and Ba{sub 3}ZnHg{sub 10} with new complex structure types. Black-Right-Pointing-Pointer Structure relation to other complex cubic intermetallics. Black-Right-Pointing-Pointer Discussion of covalent and metallic bonding aspects, as found by the structure features and band structure calculations.

  7. Interfacial analysis of the ex-situ reinforced phase of a laser spot welded Zr-based bulk metallic glass composite

    SciTech Connect (OSTI)

    Wang, Huei-Sen, E-mail: huei@isu.edu.tw [Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 84001, Taiwan (China); Department of Chemical and Materials Engineering, National University of Kaohsiung, 81148, Kaohsiung, Taiwan (China); Chen, Hou-Guang [Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 84001, Taiwan (China); Jang, Jason Shian-Ching [Institute of Materials Science and Engineering and Department of Mechanical Engineering, National Central University, Chung-Li 32001, Taiwan (China); Lin, Dong-Yih [Department of Chemical and Materials Engineering, National University of Kaohsiung, 81148, Kaohsiung, Taiwan (China); Gu, Jhen-Wang [Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 84001, Taiwan (China)

    2013-12-15T23:59:59.000Z

    To study the interfacial reaction of the ex-situ reinforced phase (Ta) of a Zr-based ((Zr{sub 48}Cu{sub 36}Al{sub 8}Ag{sub 8})Si{sub 0.75} + Ta{sub 5}) bulk metallic glass composite after laser spot welding, the interfacial regions of the reinforced phases located at specific zones in the welds including the parent material, weld fusion zone and heat affected zone were investigated. Specimen preparation from the specific zones for transmission electron microscopy analysis was performed using the focused ion beam technique. The test results showed that the reinforced phases in the parent material, weld fusion zone and heat affected zone were all covered by an interfacial layer. From microstructure analysis, and referring to the phase diagram, it was clear that the thin layers are an intermetallic compound ZrCu phase. However, due to their different formation processes, those layers show the different morphologies or thicknesses. - Highlights: • An ex-situ Zr-based BMG composite was laser spot welded. • The interfacial regions of the RPs located at PM, WFZ and HAZ were investigated. • The RPs in the PM, WFZ and HAZ were all covered by a ZrCu interfacial layer. • Due to different formation processes, those layers show the different morphology.

  8. Synthesis, Crystal Structure, and Properties of the Rhomboheral Modification of the Thiospinel CuZr1.86(1)S4

    SciTech Connect (OSTI)

    Dong, Yongkwan [Cornell University; McGuire, Michael A [ORNL; Hoseop, Yun [Ajou University, Suwon, South Korea; DiSalvo, Francis J. [Cornell University

    2009-01-01T23:59:59.000Z

    The rhombohedral modification of the thiospinel, CuZr{sub 1.86(1)}S{sub 4}, has been synthesized by the reaction of the constituent elements in an alkali metal halide flux and structurally characterized by single crystal X-ray diffraction techniques. The title compound crystallizes in the rhombohedral space group D{sub 3d}{sup 5}-R{bar 3}m (166, a=7.3552(2) {angstrom}, c=35.832(2) {angstrom}, V=1678.76(13) {angstrom}{sup 3}, Z=12, and R/wR=0.0239/0.0624). The structure is composed of close packed S layers, with a stacking order of ABCBCABABCACAB along the c axis. The Zr and Cu atoms occupy the octahedral and tetrahedral holes between S layers, respectively. Three different kinds of S-M-S layers exist in the structure: layer I has fully occupied Zr and Cu sites, layer II has fully occupied Zr sites but no Cu, and layer III has partially occupied Zr and fully occupied Cu sites. Transport and optical properties indicate that the title compound is a small band gap (1.26 eV) n-type semiconductor.

  9. Study of calcium-containing orthophosphates of NaZr{sub 2}(PO{sub 4}){sub 3} structural type by high-temperature X-ray diffraction

    SciTech Connect (OSTI)

    Orlova, A. I.; Kanunov, A. E., E-mail: a.kanunov@mail.ru [Nizhni Novgorod State University (Russian Federation); Samoilov, S. G.; Kazakova, A. Yu.; Kazantsev, G. N. [Leipunsky Institute of Physics and Power Engineering (Russian Federation)] [Leipunsky Institute of Physics and Power Engineering (Russian Federation)

    2013-03-15T23:59:59.000Z

    Orthophosphates Ca{sub 0.5}Ti{sub 2}(PO{sub 4}){sub 3}, Ca{sub 0.5}Zr{sub 2}(PO{sub 4}){sub 3}, Ca{sub 0.75}Zr{sub 2}(SiO{sub 4}){sub 0.5}(PO{sub 4}){sub 2.5}, and CaMg{sub 0.5}Zr{sub 1.5}(PO{sub 4}){sub 3} (structural type NaZr{sub 2}(PO{sub 4}){sub 3}), having different occupancies of interframework positions by calcium, have been prepared by the sol-gel method with the subsequent thermal treatment of dried gels and investigated by IR spectroscopy and X-ray diffraction. The analytical indexing of X-ray diffraction patterns is performed within the sp. gr. R3{sup -}. High-temperature X-ray diffraction was used to investigate the behavior of the orthophosphates upon heating: thermal expansion in the temperature range of 20-610 Degree-Sign C (up to 500 Degree-Sign C for Ca{sub 0.5}Zr{sub 2}(PO{sub 4}){sub 3}). The coefficients of thermal expansion are calculated from the shift of diffraction peaks. The unit-cell parameters of crystals at different temperatures are determined. The dependences of thermal expansion and its anisotropy on the occupancy of cation M positions by calcium are revealed.

  10. Localization of vacancies and mobility of lithium ions in Li{sub 2}ZrO{sub 3} as obtained by {sup 6,7}Li NMR

    SciTech Connect (OSTI)

    Baklanova, Ya. V., E-mail: baklanovay@ihim.uran.ru [Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91 Pervomaiskaya str., 620990 Ekaterinburg (Russian Federation); Arapova, I. Yu.; Buzlukov, A.L.; Gerashenko, A.P.; Verkhovskii, S.V.; Mikhalev, K.N. [Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 18 Kovalevskaya str., 620990 Ekaterinburg (Russian Federation); Denisova, T.A.; Shein, I.R.; Maksimova, L.G. [Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 91 Pervomaiskaya str., 620990 Ekaterinburg (Russian Federation)

    2013-12-15T23:59:59.000Z

    The {sup 6,7}Li NMR spectra and the {sup 7}Li spin–lattice relaxation rate were measured on polycrystalline samples of Li{sub 2}ZrO{sub 3}, synthesized at 1050 K and 1300 K. The {sup 7}Li NMR lines were attributed to corresponding structural positions of lithium Li1 and Li2 by comparing the EFG components with those obtained in the first-principles calculations of the charge density in Li{sub 2}ZrO{sub 3}. For both samples the line width of the central {sup 7}Li transition and the spin–lattice relaxation time decrease abruptly at the temperature increasing above ?500 K, whereas the EFG parameters are averaged (??{sub Q}?=42 (5) kHz) owing to thermally activated diffusion of lithium ions. - Graphical abstract: Path of lithium ion hopping in lithium zirconate Li{sub 2}ZrO{sub 3}. - Highlights: • Polycrystalline samples Li{sub 2}ZrO{sub 3} with monoclinic crystal structure synthesized at different temperatures were investigated by {sup 6,7}Li NMR spectroscopy. • Two {sup 6,7}Li NMR lines were attributed to the specific structural positions Li1 and Li2. • The distribution of vacancies was clarified for both lithium sites. • The activation energy and pathways of lithium diffusion in Li{sub 2}ZrO{sub 3} were defined.

  11. Hydrothermal synthesis and afterglow luminescence properties of hollow SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} spheres for potential application in drug delivery

    SciTech Connect (OSTI)

    Feng, Pengfei; Zhang, Jiachi, E-mail: zhangjch@lzu.edu.cn; Qin, Qingsong; Hu, Rui; Wang, Yuhua

    2014-02-01T23:59:59.000Z

    Highlights: • We designed a novel afterglow labeling material SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} for the first time. • Hollow SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} spheres with afterglow were prepared by hydrothermal method. • Hollow SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} is a potential afterglow labeling medium for drug delivery. - Abstract: A novel afterglow labeling material SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} with hollow sphere shape and intense afterglow luminescence is prepared by hydrothermal method at 180 °C for the first time. The morphology and the sphere growth process of this material are investigated by scanning electron microscopy in detail. The afterglow measurement shows that this hydrothermal obtained material exhibits obvious red afterglow luminescence (550–700 nm) of Sm{sup 3+} which can last for 542 s (0.32 mcd/m{sup 2}). The depth of traps in this hydrothermal obtained material is calculated to be as shallow as 0.58 eV. The results demonstrate that although it is necessary to further improve the afterglow performance of the hydrothermal derived hollow SnO{sub 2}:Sm{sup 3+},Zr{sup 4+} spheres, it still can be regarded as a potential afterglow labeling medium for drug delivery.

  12. Potential variations around grain boundaries in impurity-doped BaSi? epitaxial films evaluated by Kelvin probe force microscopy

    SciTech Connect (OSTI)

    Tsukahara, D.; Baba, M.; Honda, S.; Toko, K. [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); Imai, Y. [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); AIST, Tsukuba, Ibaraki 305-8565 (Japan); Hara, K. O.; Usami, N. [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan); Japan Science and Technology Agency, CREST, Chiyoda, Tokyo 102-0075 (Japan); Werner, J. H. [Institute for Photovoltaics, University of Stuttgart, Stuttgart 70569 (Germany); Suemasu, T. [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); Japan Science and Technology Agency, CREST, Chiyoda, Tokyo 102-0075 (Japan); Institute for Photovoltaics, University of Stuttgart, Stuttgart 70569 (Germany)

    2014-09-28T23:59:59.000Z

    Potential variations around the grain boundaries (GBs) in antimony (Sb)-doped n-type and boron (B)-doped p-type BaSi? epitaxial films on Si(111) were evaluated by Kelvin probe force microscopy. Sb-doped n-BaSi? films exhibited positively charged GBs with a downward band bending at the GBs. The average barrier height for holes was approximately 10 meV for an electron concentration n ? 10¹? cm?³. This downward band bending changed to upward band bending when n was increased to n = 1.8 × 10¹?cm?³. In the B-doped p-BaSi? films, the upward band bending was observed for a hole concentration p ? 10¹?cm?³. The average barrier height for electrons decreased from approximately 25 to 15 meV when p was increased from p = 2.7 × 10¹? to p = 4.0 × 10¹? cm?³. These results are explained under the assumption that the position of the Fermi level E{sub f} at GBs depends on the degree of occupancy of defect states at the GBs, while E{sub f} approached the bottom of the conduction band or the top of the valence band in the BaSi? grain interiors with increasing impurity concentrations. In both cases, such small barrier heights may not deteriorate the carrier transport properties. The electronic structures of impurity-doped BaSi? are also discussed using first-principles pseudopotential method to discuss the insertion sites of impurity atoms and clarify the reason for the observed n-type conduction in the Sb-doped BaSi? and p-type conduction in the B-doped BaSi?.

  13. Tsovaltzi, D., Weinberger, A., Scheuer, O., Dragon, T. & McLaren, B.M., (2012). Argument diagrams in Facebook: Facilitating the formation of scientifically sound opinions. In: A. Ra-

    E-Print Network [OSTI]

    McLaren, Bruce Martin

    2012-01-01T23:59:59.000Z

    in Facebook: Facilitating the formation of scientifically sound opinions. In: A. Ra- venscroft, S. Lindstaedt in Facebook: Facilitating the Formation of Scientifically Sound Opinions Dimitra Tsovaltzi, Armin Weinberger Dimitra.tsovalzi@mx.uni-saarland.de Students use Facebook to organize their classroom experiences [1

  14. 85R.A. Calvo and S.K. D'Mello (eds.), New Perspectives on Affect and Learning Technologies, Explorations in the Learning Sciences, Instructional Systems and Performance Technologies 3,

    E-Print Network [OSTI]

    Young, R. Michael

    85R.A. Calvo and S.K. D'Mello (eds.), New Perspectives on Affect and Learning Technologies to which he or she is motivated to continue with the learning process (Kort, Reilly, & Picard, 2001; Picard work (Arroyo, Woolf, Royer, & Tai, 2009; Chaffar & Frasson, 2004; D'Mello et al., 2008; Forbes- Riley

  15. Citation: Myers, R.A. and C.A. Ottensmeyer.(2005, in press). Extinction Risk in Marine Species. in Norse, E.A. and L.B. Crowder, eds. Marine Conservation Biology: The Science of Maintaining the Sea's Biodiversity. Island

    E-Print Network [OSTI]

    Myers, Ransom A.

    Citation: Myers, R.A. and C.A. Ottensmeyer.(2005, in press). Extinction Risk in Marine Species's Biodiversity. Island Press, Washington DC (USA) Chapter 5 Extinction Risk in Marine Species Ransom A. Myers C resources seemed inexhaustible, its capacity boundless. Marine species have even been considered "extinction

  16. Negative Thermal Expansion in ZrW{sub 2}O{sub 8}: Mechanisms, Rigid Unit Modes, and Neutron Total Scattering

    SciTech Connect (OSTI)

    Tucker, Matthew G. [Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ (United Kingdom); ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (United Kingdom); Goodwin, Andrew L.; Dove, Martin T. [Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ (United Kingdom); Keen, David A. [Physics Department, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom); ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (United Kingdom); Wells, Stephen A. [Biological Physics, Bateman Physical Sciences Building, Arizona State University, Tempe, Arizona 85287-1504 (United States); Evans, John S.O. [Department of Chemistry, University Science Laboratories, South Road, Durham DH1 3LE (United Kingdom)

    2005-12-16T23:59:59.000Z

    The local structure of the low-temperature ordered phase of the negative thermal expansion (NTE) material ZrW{sub 2}O{sub 8} has been investigated by reverse Monte Carlo (RMC) modeling of neutron total scattering data. We obtain, for the first time, quantitative measurements of the extent to which the WO{sub 4} and ZrO{sub 6} polyhedra move as rigid units, and we show that these values are consistent with the predictions of rigid unit mode theory. We suggest that rigid unit modes are associated with the NTE. Our results do not support a recent interpretation of x-ray-absorption fine structure spectroscopy data in terms of a larger rigid structural component involving the Zr-O-W linkage.

  17. Effects of sub-Tg annealing on Cu64.5Zr35.5 glasses: A molecular dynamics study

    SciTech Connect (OSTI)

    Zhang, Feng [Ames Laboratory; Mendelev, Mikhail I. [Ames Laboratory; Zhang, Yue [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Kramer, Matthew J. [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory

    2014-02-11T23:59:59.000Z

    Creating metallic glasses by cooling liquid melts in molecular dynamics simulations faces a well-known challenge that the cooling rate is too fast compared with experiments. Taking the prototypical Cu 64.5Zr35.5 glasses as an example, we propose an efficient cooling strategy in which most of the computer time is spent on a prolonged isothermal process slightly below the glass-transition temperature, Tg . The glassy sample prepared in this way demonstrates significant energetic stability, slow dynamics, and well-developed short-range icosahedral order. By conventional uniform cooling, similar properties can only be obtained using a cooling rate more than 15 times slower.

  18. Electron-Transport Properties of Amorphous (Zr0.64ni0.36)1-Xalx Alloys

    E-Print Network [OSTI]

    BHATNAGAR, AK; PAN, R.; Naugle, Donald G.

    1989-01-01T23:59:59.000Z

    PHYSICAL REVIEW B VOLUME 39, NUMBER 17 15 JUNE 1989-I Electron transport properties of amorphous (Zro 64Nio 36), ?Al?alloys A. K. Bhatnagar, ' R. Pan, and D. G. Naugle Department ofPhysics, Texas Ad'cM Uniuersity, College Station, Texas 77843...-4242 (Received 28 November 1988; revised manuscript received 16 March 1989) Measurements of the electrical resistivity p(T), thermopower S(T), and Hall coe%cient RH for a series of rapidly quenched Zr-Ni-Al alloys are reported for concentrations from x =0 to 0...

  19. The structural and mechanical properties of a Cu??Zr??(at. %) alloy processed by High-Velocity-Injection (HVI)

    E-Print Network [OSTI]

    Hays, Charles C.

    1986-01-01T23:59:59.000Z

    /vacuum coupled pressure gradient. The molten jet rapidly solidifies, as it is in good thermal contact wi th the cir- cular walls of the copper channel. This process (melting and injection) is carried out in inert protective atmospheres (helium). The samples... produced are in the form of cylindrical rods with large length to diameter ratios (40:1). The samples exhibit a good sur- face finish and are of high density. The structural and mechanical characterization of the Cu6 Zr 0(at. %%u) samples produced...

  20. Characterization of self-propagating formation reactions in Ni/Zr multilayered foils using reaction heats, velocities, and temperature-time profiles

    SciTech Connect (OSTI)

    Barron, S. C.; Knepper, R.; Walker, N.; Weihs, T. P.

    2011-01-11T23:59:59.000Z

    We report on intermetallic formation reactions in vapor-deposited multilayered foils of Ni/Zr with 70 nm bilayers and overall atomic ratios of Ni:Zr, 2 Ni:Zr, and 7 Ni:2 Zr. The sequence of alloy phase formation and the stored energy is evaluated at slow heating rates (~1 K/s) using differential scanning calorimetry (DSC) traces to 725ºC. All three chemistries initially form a Ni-Zr amorphous phase which crystallizes first to the intermetallic NiZr. The heat of reaction to the final phase is 34-36 kJ/mol atom for all chemistries. Intermetallic formation reactions are also studied at rapid heating rates (greater than 105 K/s) in high temperature, self-propagating reactions which can be ignited in these foils by an electric spark. We find that reaction velocities and maximum reaction temperatures (Tmax) are largely independent of foil chemistry at 0.6 ± 0.1 m/s and 1220 ± 50 K, respectively, and that the measured Tmax is more than 200 K lower than predicted adiabatic temperatures (Tad). The difference between Tmax and Tad is explained by the prediction that transformation to the final intermetallic phases occurs after Tmax and results in the release of 20-30 % of the total heat of reaction and a delay in rapid cooling.

  1. First principle study of elastic and thermodynamic properties of ZrZn{sub 2} and HfZn{sub 2} under high pressure

    SciTech Connect (OSTI)

    Sun, Na; Zhang, Xinyu, E-mail: jiaqianqin@gmail.com; Ning, Jinliang; Zhang, Suhong; Liang, Shunxing; Ma, Mingzhen; Liu, Riping [State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 (China); Qin, Jiaqian, E-mail: jiaqianqin@gmail.com [Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330 (Thailand)

    2014-02-28T23:59:59.000Z

    A comprehensive investigation of the structural, elastic, and thermodynamic properties for Laves-phases ZrZn{sub 2} and HfZn{sub 2} are conducted using density functional total energy calculations combined with the quasi-harmonic Debye model. The optimized lattice parameters of ZrZn{sub 2} and HfZn{sub 2} compare well with available experimental values. We estimated the mechanical behaviors of both compounds under compression, including mechanical stability, Young's modulus, Poisson's ratio, ductility, and anisotropy. Additionally, the thermodynamic properties as a function of pressure and temperature are analyzed and found to be in good agreement with the corresponding experimental data.

  2. BaBar technical design report: Chapter 9, Magnet coil and flux return

    SciTech Connect (OSTI)

    O`Connor, T.; The BaBar Collaboration

    1995-03-01T23:59:59.000Z

    The BaBar magnet is a thin, 1.5 T superconducting solenoid with a hexagonal flux return. This chapter discusses the physics requirements and performance goals for the magnet, describes key interfaces, and summarizes the projected magnet performance. It also presents the design of the superconducting solenoid, including magnetic design, cold mass design, quench protection and stability, cold mass cooling, cryostat design, and coil assembly and transportation. The cryogenic supply system and instrumentation are described briefly, and the flux return is described.

  3. Magnetoelastically coupled structural, magnetic, and superconducting order parameters in BaFe?(As??xPx)?

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kuo, H.-H.; Analytis, James G.; Chu, J.-H.; Fernandes, R. M.; Schmalian, J.; Fisher, I. R.

    2012-10-01T23:59:59.000Z

    We measure the transport properties of mechanically strained single crystals of BaFe?(As??xPx)? over a wide range of x. The Néel transition is extremely sensitive to stress and this sensitivity increases as optimal doping is approached (doping with the highest superconducting Tc), even though the magnetic transition itself is strongly suppressed. Furthermore, we observe significant changes in the superconducting transition temperature with applied strain, which mirror changes in the composition x. These experiments are a direct illustration of the intimate coupling between different degrees of freedom in iron-based superconductors, revealing the importance of magnetoelastic coupling to the magnetic and superconducting transition temperatures.

  4. High temperature crystal structures and superionic properties of SrCl{sub 2}, SrBr{sub 2}, BaCl{sub 2} and BaBr{sub 2}

    SciTech Connect (OSTI)

    Hull, Stephen, E-mail: stephen.hull@stfc.ac.uk [The ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom); Norberg, Stefan T. [The ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom); Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Ahmed, Istaq; Eriksson, Sten G. [Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Mohn, Chris E. [Department of Chemistry and Centre for Materials Science and Nanotechnology, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo (Norway)

    2011-11-15T23:59:59.000Z

    The structural properties of the binary alkaline-earth halides SrCl{sub 2}, SrBr{sub 2}, BaCl{sub 2} and BaBr{sub 2} have been investigated from ambient temperature up to close to their melting points, using the neutron powder diffraction technique. Fluorite-structured SrCl{sub 2} undergoes a gradual transition to a superionic phase at 900-1100 K, characterised by an increasing concentration of anion Frenkel defects. At a temperature of 920(3) K, the tetragonal phase of SrBr{sub 2} undergoes a first-order transition to a cubic fluorite phase. This high temperature phase shows the presence of extensive disorder within the anion sublattice, which differs from that found in superionic SrCl{sub 2}. BaCl{sub 2} and BaBr{sub 2} both adopt the cotunnite crystal structure under ambient conditions. BaCl{sub 2} undergoes a first-order structural transition at 917(5) K to a disordered fluorite-structured phase. The relationship between the (disordered) crystal structures and the ionic conductivity behaviour is discussed and the influence of the size of the mobile anion on the superionic behaviour is explored. - Graphical abstract: Anomalous behaviour of the lattice expansion of SrCl{sub 2} at temperatures of {approx}1000 K is associated with the gradual transition to a superionic phase, whilst SrBr{sub 2} undergoes a first-order structural transition ({beta}{yields}{alpha}) to a fluorite-structured superionic phase at 920(3) K. Highlights: > Anomalous behaviour of the lattice expansion of SrCl{sub 2} occurs at temperatures {approx}1000 K. > Crystal structure of {beta}-SrBr{sub 2} is described in detail. > On heating, SrBr{sub 2} and BaCl{sub 2} transform to a fluorite-structured superionic phase. > Temperature dependence of the BaCl{sub 2} and BaBr{sub 2} structures is presented. > Nature of the superionic phases within the alkaline-earth halides is discussed.

  5. Electron-stimulated desorption from polished and vacuum fired 316LN stainless steel coated with Ti-Zr-Hf-V

    SciTech Connect (OSTI)

    Malyshev, Oleg B., E-mail: oleg.malyshev@stfc.ac.uk; Valizadeh, Reza; Hogan, Benjamin T.; Hannah, Adrian N. [ASTeC, STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD Cheshire (United Kingdom)

    2014-11-01T23:59:59.000Z

    In this study, two identical 316LN stainless steel tubular samples, which had previously been polished and vacuum-fired and then used for the electron-stimulated desorption (ESD) experiments, were coated with Ti-Zr-Hf-V with different morphologies: columnar and dense. ESD measurement results after nonevaporable getter (NEG) activation to 150, 180, 250, and 350?°C indicated that the values for the ESD yields are significantly (2–20 times) lower than the data from our previous study with similar coatings on nonvacuum-fired samples. Based on these results, the lowest pressure and best long-term performance in particle accelerators will be achieved with a vacuum-fired vacuum chamber coated with dense Ti-Zr-Hf-V coating activated at 180?°C. This is likely due to the following facts: after NEG activation, the hydrogen concentration inside the NEG was lower than in the bulk stainless steel substrate; the NEG coating created a barrier for gas diffusion from the sample bulk to vacuum; the dense NEG coating performed better as a barrier than the columnar NEG coating.

  6. High temperature oxidation behavior of austenitic stainless steel AISI 304 in steam of nanofluids contain nanoparticle ZrO2

    SciTech Connect (OSTI)

    Prajitno, Djoko Hadi, E-mail: djokohp@batan.go.id; Syarif, Dani Gustaman, E-mail: djokohp@batan.go.id [Research Center for Nuclear Materials and Radiometry, Jl. Tamansari 71, Bandung 40132 (Indonesia)

    2014-03-24T23:59:59.000Z

    The objective of this study is to evaluate high temperature oxidation behavior of austenitic stainless steel SS 304 in steam of nanofluids contain nanoparticle ZrO{sub 2}. The oxidation was performed at high temperatures ranging from 600 to 800°C. The oxidation time was 60 minutes. After oxidation the surface of the samples was analyzed by different methods including, optical microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD). X-ray diffraction examination show that the oxide scale formed during oxidation of stainless steel AISI 304 alloys is dominated by iron oxide, Fe{sub 2}O{sub 3}. Minor element such as Cr{sub 2}O{sub 3} is also appeared in the diffraction pattern. Characterization by optical microscope showed that cross section microstructure of stainless steel changed after oxidized with the oxide scale on the surface stainless steels. SEM and x-ray diffraction examination show that the oxide of ZrO{sub 2} appeared on the surface of stainless steel. Kinetic rate of oxidation of austenite stainless steel AISI 304 showed that increasing oxidation temperature and time will increase oxidation rate.

  7. Avoided Quantum Criticality and Magnetoelastic Coupling in BaFe2-xNixAs2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Lu, Xingye; Gretarsson, H.; Zhang, Rui; Liu, Xuerong; Luo, Huiqian; Tian, Wei; Laver, Mark; Yamani, Z.; Kim, Young-June; Nevidomskyy, A. H.; Si, Qimiao; Dai, Pengcheng

    2013-06-01T23:59:59.000Z

    We study the structural and magnetic orders in electron-doped BaFe2?xNixAs2 by high-resolution synchrotron x-ray and neutron scatterings. Upon Ni doping x, the nearly simultaneous tetragonal-to-orthorhombic structural (Ts) and antiferromagnetic (TN) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in Ts>TN with increasing x, as was previously observed. However, the temperature separation between Ts and TN decreases with increasing x for x?0.065, tending toward a quantum bicritical point near optimal superconductivity at x?0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.088?x?0.104, resulting in a finite value of TN?Tc+10??K above the superconducting dome around x?0.1. Our results imply an avoided quantum critical point, which is expected to strongly influence the properties of both the normal and superconducting states.

  8. $(h_{11/2})^2$ alignments in neutron-rich $^{132}$Ba with negative-parity pairs

    E-Print Network [OSTI]

    Yang Lei; Zhengyu Xu

    2015-03-01T23:59:59.000Z

    The shell-model collective-pair truncation with negative-parity pairs is adopted to study the $(h_{11/2})^2$ alignment in $^{132}$Ba. The proton $(h_{11/2})^2$-alignment state is predicted as an $E\\sim4.6$ MeV and $\\tau\\sim 0.5~\\mu$s isomer with relatively strong E3 decay channels. The oblately deformed neutron $(h_{11/2})^{-2}$ alignment in the yrast band and four negative-parity bands are confirmed, even although two of these negative-parity bands favor the prolate deformation, which directly manifests the $\\gamma$ unstability of $^{132}$Ba.

  9. Evidence for a phosphorylation-independent role for Ser 32 and 36 in proteasome inhibitor-resistant (PIR) InBa degradation in B cells

    E-Print Network [OSTI]

    Miyamoto, Shigeki

    -resistant (PIR) InBa degradation in B cells Shelby O'Connor, Stephanie Markovina, Shigeki MiyamotoT Program is maintained through proteasome inhibitor-resistant (PIR) InBa degradation in a manner that requires Ser 32 whether dual phosphorylation of Ser 32 and 36 was required for PIR degradation. Through mutagenesis

  10. Page 1 | B.A. in Special Education (General Curriculum) and Elementary Education (K-6) Dual Major | Academic Plan of Study

    E-Print Network [OSTI]

    Raja, Anita

    | Academic Plan of Study Updated May 2014 B.A. in Special Education (General Curriculum) and ElementaryPage 1 | B.A. in Special Education (General Curriculum) and Elementary Education (K-6) Dual Major Education (K-6) Dual Program Academic Plan of Study College of Education Department of Special Education

  11. Studies on catalytic and structural properties of BaRuO3 type perovskite1 material for diesel soot oxidation2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Studies on catalytic and structural properties of BaRuO3 type perovskite1 material for diesel by co-precipitation24 method and its catalytic activity has been tested for diesel soot oxidation processes and vehicle exhaust.33 Key words: BaRuO3, perovskite, diesel soot oxidation, vehicular exhaust

  12. Controlling internal barrier in low loss BaTiO3 supercapacitors U-C. Chung, C. Elissalde, S. Mornet and M. Maglione

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Controlling internal barrier in low loss BaTiO3 supercapacitors U-C. Chung, C. Elissalde, S Supercapacitor behavior has been reported in a number of oxides including reduced BaTiO3 ferroelectric ceramics to process bulk composites having supercapacitor features with low dielectric losses and temperature

  13. TOPIC TIME LOCATION CATEGORY TITLE AUTHORS INSTITUTION Advanced Energy Systems 10:15 to 10:35 AM BA1180 CSME

    E-Print Network [OSTI]

    :30 to 11:45 AM BA2139 CSME An Autonomous Vehicle for Navigation and Path Following in Outdoor Farms F FUEL CELL ELECTRODES S. M. R. Niya ,M. Hoorfar University of British Columbia Advanced Energy Systems 4:05 to 4:25 PM BA1180 CSME Effect of Hygrothermal Fatigue on Damage Propagation in PEM Fuel Cell Membrane R

  14. Guided wave absorption and uorescence in epitaxial Er:BaTiO3 on MgO D.M. Gilla,*, G.M. Fordb

    E-Print Network [OSTI]

    Ho, Seng-Tiong

    . Keywords: Er:BaTiO3; Fluorescence; Luminescence 1. Introduction The development of low-cost composite waveguides fabricated in erbium-doped thin-®lm epitaxial BaTiO3. Luminescence transient measurements indicate strategies toward the realization of this type of opto-electronic circuit. Proposed designs of hybrid opto

  15. 11196. Proposed by Mohammad Hossein Mehrabi, Iran University of Science and Technology, Tehran, Iran. Let A and B be real n n matrices. Show that if AB -BA is invertible and A2

    E-Print Network [OSTI]

    Heckman, Christopher Carl

    11196. Proposed by Mohammad Hossein Mehrabi, Iran University of Science and Technology, Tehran, Iran. Let A and B be real n Ã? n matrices. Show that if AB - BA is invertible and A2 + B2 = 3(AB - BA

  16. A Novel Combustion Synthesis Preparation of CuO/ZnO/ZrO2/Pd for Oxidative Hydrogen Production from Methanol

    E-Print Network [OSTI]

    Mukasyan, Alexander

    A Novel Combustion Synthesis Preparation of CuO/ZnO/ZrO2/Pd for Oxidative Hydrogen Production from pre- pared via three combustion synthesis routes including volume combustion, impregnated substrate combustion, and so-called second wave impregnation combustion methods. These catalysts were characterized via

  17. A thermokinetic model describing the vaporization behavior of U[sub x]Zr[sub 1-x]C[sub 1-y] in hydrogen

    SciTech Connect (OSTI)

    Butt, D.P.

    1993-01-01T23:59:59.000Z

    This paper describes the thermodynamics and kinetics of the corrosion of U[sub x]Zr[sub 1-x]C[sub 1-y] in hydrogen gas. It describes how corrosion rates are influenced by variables such as pressure, temperature, and gas flow rate. A model is developed which agrees with experimental steady-state corrosion rates at 1 atm between 2670 and 3100 K. It is shown that under steady-state conditions the corrosion flux is rate limited by the vapor phase transport of Zr(g) away from the solid surface to the bulk gas stream where the partial pressure of Zr(g) is determined by the congruently vaporizing surface composition. Extrapolation of the model to higher pressures indicates that Zr(g) transport should also be rate limiting at higher pressures but the corrosion rate should decrease slightly with increased hydrogen pressure due to reduced gaseous diffusion rates. The model predicts that the corrosion rate will increase as the square root of gas velocity for a given temperature and pressure. Calculations demonstrating the effects of gas velocity are in agreement with experimental studies.

  18. A thermokinetic model describing the vaporization behavior of U{sub x}Zr{sub 1-x}C{sub 1-y} in hydrogen

    SciTech Connect (OSTI)

    Butt, D.P

    1993-05-01T23:59:59.000Z

    This paper describes the thermodynamics and kinetics of the corrosion of U{sub x}Zr{sub 1-x}C{sub 1-y} in hydrogen gas. It describes how corrosion rates are influenced by variables such as pressure, temperature, and gas flow rate. A model is developed which agrees with experimental steady-state corrosion rates at 1 atm between 2670 and 3100 K. It is shown that under steady-state conditions the corrosion flux is rate limited by the vapor phase transport of Zr(g) away from the solid surface to the bulk gas stream where the partial pressure of Zr(g) is determined by the congruently vaporizing surface composition. Extrapolation of the model to higher pressures indicates that Zr(g) transport should also be rate limiting at higher pressures but the corrosion rate should decrease slightly with increased hydrogen pressure due to reduced gaseous diffusion rates. The model predicts that the corrosion rate will increase as the square root of gas velocity for a given temperature and pressure. Calculations demonstrating the effects of gas velocity are in agreement with experimental studies.

  19. COMPARISON OF THE CORROSION BEHAVIOR OF A BULK AMORPHOUS METAL, Zr41.2Ti13.8Cu12.5Ni10Be22.5,

    E-Print Network [OSTI]

    Ritchie, Robert

    COMPARISON OF THE CORROSION BEHAVIOR OF A BULK AMORPHOUS METAL, Zr41.2Ti13.8Cu12.5Ni10Be22 exhibit excellent corrosion resistance (4­7), which has been explained in terms of their structural researchers attribute "good corrosion resistance" to the entire class of amorphous metals. It is this point

  20. From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd{sub 2}Zr{sub 2}O{sub 7}

    SciTech Connect (OSTI)

    Payne, Julia L. [Department of Chemistry, Durham University, South Road, Durham DH1 3LE (United Kingdom); Tucker, Matthew G. [ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX (United Kingdom); Evans, Ivana Radosavljevi?, E-mail: ivana.radosavljevic@durham.ac.uk [Department of Chemistry, Durham University, South Road, Durham DH1 3LE (United Kingdom)

    2013-09-15T23:59:59.000Z

    The structural characterisation of Nd{sub 2}Zr{sub 2}O{sub 7} prepared via a precursor route was performed using a combination of local and average structure probes (neutron total scattering, X-ray and neutron diffraction). We present the first total scattering and reverse Monte Carlo (RMC) modelling study of Nd{sub 2}Zr{sub 2}O{sub 7}, which provides compelling evidence for the adoption of a disordered fluorite-type structure by Nd{sub 2}Zr{sub 2}O{sub 7} prepared by a low-temperature precursor route. Annealing the material at high temperatures leads to a transformation to a pyrochlore-type structure; however, Rietveld refinement using powder neutron diffraction data shows that the oxygen sublattice retains a degree of disorder. - Graphical abstract: Display Omitted - Highlights: • The first total scattering and RMC modelling study of Nd{sub 2}Zr{sub 2}O{sub 7}. • Demonstration that the synthetic route influences the crystal structure adopted. • Insight into the importance of total scattering in studies of complex superstructures, especially for nano-sized materials.

  1. Growth and Properties of (001)-oriented Pb(Zr?.??Ti?.??)O?/LaNiO? Films on Si(001) Substrates with TiN Buffer Layers

    E-Print Network [OSTI]

    Zhu, Tie-Jun

    Pulsed laser deposition has been used to grow Pb(Zr?.??Ti?.??)O? (PZT)/LaNiO? (LNO) heterostructures with restricted crystallographic orientations on bare Si(001) and SiO?-coated Si(001) substrates, using TiN buffer layers. ...

  2. 13.21 Geochemistry of the Rare-Earth Element, Nb, Ta, Hf, and Zr Deposits RL Linnen, University of Western Ontario, London, ON, Canada

    E-Print Network [OSTI]

    Chakhmouradian, Anton

    13.21 Geochemistry of the Rare-Earth Element, Nb, Ta, Hf, and Zr Deposits RL Linnen, University of rare metals in natural fluids 551 13.21.2.2.2 Aqueous complexation and mineral solubility 552 13 Acknowledgments 564 References 564 13.21.1 Introduction Rare-element mineral deposits, also called rare-metal

  3. Design of 7 wt.% Y2O3-ZrO2/Mullite Plasma-Sprayed Composite Coatings for Increased Creep Resistance

    E-Print Network [OSTI]

    Trice, Rodney W.

    examined using X-ray diffraction, dilatometry, and compression creep. Creep test were conducted on all specimens for all combinations of temperature and stress tested, the creep response of the compositeDesign of 7 wt.% Y2O3-ZrO2/Mullite Plasma-Sprayed Composite Coatings for Increased Creep Resistance

  4. X-ray Peak Profile Analysis on the Microstructure of Al-5.9%Mg-0.3%Sc-0.18%Zr Alloy Deformed by

    E-Print Network [OSTI]

    Gubicza, Jenõ

    by transmission electron microscopy (TEM). 1 Introduction It is well known that alloying of aluminium of the aluminium alloys has been extensively studied [e.g. 1,6], only little information exist on the effectX-ray Peak Profile Analysis on the Microstructure of Al-5.9%Mg-0.3%Sc-0.18%Zr Alloy Deformed

  5. Isotopic and internal CX{sub 3} (X=D,H) rotational motion effects in the Ba{center_dot}{center_dot}{center_dot}FCX{sub 3}+h{nu}{yields}BaF+CX{sub 3} intracluster reactions

    SciTech Connect (OSTI)

    Rinaldi, C. A.; Gasmi, K.; Skowronek, S.; Gonzalez Urena, A. [Unidad de Laseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII-1, 28040 Madrid (Spain)

    2006-06-28T23:59:59.000Z

    Photodepletion and action spectra of the laser-induced Ba{center_dot}{center_dot}{center_dot}FCD{sub 3} fragmentation have been measured over the 16 075-16 380 cm{sup -1} range. The observed band and peak structures allowed us to estimate the vibrational and rotational structures of the excited complex at the transition state configuration. The relative reaction probability P{sub R}(E) for the intracluster Ba{center_dot}{center_dot}{center_dot}FCD{sub 3}+h{nu}{yields}BaF+CD{sub 3} reaction has been determined over the cited energy range. P{sub R}(E) shows a peak structure with an energy spacing of 8.9 cm{sup -1} which was attributed to an internal rotation of the CD{sub 3} group in the intermediate state. A comparison with previous Ba{center_dot}{center_dot}{center_dot}FCH{sub 3} photofragmentation spectra reveals the dynamical role of the internal CX{sub 3} (X=H,D) motion which is manifested by the presence of rotational resonances in the laser-induced intracluster reaction.

  6. Topics for BA and MA Theses at the chair of Prof. Klasen The list below gives contains proposals for Bachelor (BA) and Master (MA) thesis topics. You can also

    E-Print Network [OSTI]

    Krivobokova, Tatyana

    (mainly case study of Indonesia) BA/MA Causality between economic development, energy consumption: Trends in migration and land use change: Does reverse causality exist? Evidence from the Indonesian Filipiak, Ute: Household Finance and Consumption in Europe: Culture Clash between North and South? MA

  7. Ab initio molecular dynamics simulations of ion-solid interactions in Gd2Zr2O7 and Gd2Ti2O7

    SciTech Connect (OSTI)

    Wang, X J [University of Electronic Science and Technology of China (UESTC); Xiao, Haiyan [University of Tennessee, Knoxville (UTK); Zu, X T [University of Electronic Science and Technology of China (UESTC); Zhang, Yanwen [ORNL; Weber, William J [ORNL

    2013-01-01T23:59:59.000Z

    The development of ab initio molecular dynamics (AIMD) method has made it a powerful tool in describing ion-solid interactions in materials, with identification determination of threshold displacement energies with ab initio accuracy, and prediction of new mechanism for defect generation and new defective states that are different from classical molecular dynamics (MD) simulations. In the present work, this method is employed to study the low energy recoil events in Gd2Zr2O7 and Gd2Ti2O7. The weighted average threshold displacement energies in Gd2Zr2O7 are determined to be 38.8 eV for Gd, 41.4 eV for Zr, 18.6 eV for O48f, and 15.6 eV for O8b, which are smaller than the respective values of 41.8, >53.8, 22.6 and 16.2 eV in Gd2Ti2O7. It reveals that all the ions in Gd2Zr2O7 are more easily displaced than those in Gd2Ti2O7, and anion order-disorder are more likely to be involved in the displacement events than cation disordering. The average charge transfer from the primary knock-on atom to its neighbors is estimated to be ~0.15, ~0.11-0.27 and ~0.1-0.13 |e| for Gd, Zr (or Ti), and O, respectively. Negligence of the charge transfer in the interatomic potentials may result in the larger threshold displacement energies in classical MD.

  8. Visible-light-driven photocatalytic performance of nitrogen-doped Ti{sub 1?x}Zr{sub x}O{sub 2} solid solution

    SciTech Connect (OSTI)

    Gao, Bifen, E-mail: bfgao@hqu.edu.cn [Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021 (China)] [Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021 (China); Luo, Xiuzhen [Zhangzhou Health Vocational College, Zhangzhou 363000 (China)] [Zhangzhou Health Vocational College, Zhangzhou 363000 (China); Fu, Hao; Lin, Bizhou; Chen, Yilin [Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021 (China)] [Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021 (China); Gu, Zhanjun [Laboratory for Bio-Environmental Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)] [Laboratory for Bio-Environmental Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)

    2013-02-15T23:59:59.000Z

    Graphical abstract: Display Omitted Highlights: ? Dual modifications on the energy band of TiO{sub 2} are achieved by N and Zr co-doping. ? Nitrogen and zirconium dopants have different doping positions in the catalyst. ? A synergic impact of nitrogen and zirconium on photocatalytic activity is observed. ? A mechanism for the high performance of nitrogen-doped Ti{sub 1?x}Zr{sub x}O{sub 2} solid solution is proposed. -- Abstract: Nitrogen-doped Ti{sub 1?x}Zr{sub x}O{sub 2} solid solutions have been synthesized by a multi-step sol–gel process followed by hydrothermal treatment in ammonia solution. XRD, XPS and UV–vis diffuse reflectance analyses indicated that nitrogen was doped in the surface layer of catalyst, introducing surface states located close to valence band. However, Zr{sup 4+} was successfully incorporated into the bulk lattice of TiO{sub 2} so as to induce the up-shift of conduction band. Compared to pristine TiO{sub 2} and nitrogen-doped TiO{sub 2}, nitrogen-doped Ti{sub 1?x}Zr{sub x}O{sub 2} exhibited much higher efficiency for the degradation of Acid Red 88 solution and gaseous benzene under visible light irradiation, attributed to the synergetic effect of nitrogen and zirconium on the energy band. Specifically, the presence of surface states in the band gap enabled the extended visible light response and the up-shift of conduction band facilitated the excited electron interfacial transfer and hence suppressed efficiently the recombination of charge carriers.

  9. 4500. Nasch, P.M., M.H. Manghnani, and R.A. Secco, 1997, Anomalous behavior of sound velocity and attenuation in liquid Fe-Ni-S, Science, 277, 219-221.

    E-Print Network [OSTI]

    4500. Nasch, P.M., M.H. Manghnani, and R.A. Secco, 1997, Anomalous behavior of sound velocityForschungsZentrum, Potsdam, Germany, 6-16. 4502. Blewett, D.T., P.G. Lucey, and B.R. Hawke, 1997, Clementine images., 132, 119-132. 4504. Yu, Z.-P., P.-S. Chu, and T. Schroeder, 1997, Predictive skills of seasonal

  10. Hall-Coefficient for Oriented Tl2ba2cacu2o8+delta Thin-Films

    E-Print Network [OSTI]

    WANG, PS; WILLIAMS, JC; RATHNAYAKA, KDD; HENNINGS, BD; Naugle, Donald G.; KAISER, AB.

    1993-01-01T23:59:59.000Z

    Measurements of the Hall coefficient and resistivity for highly oriented Tl2Ba2CaCu2O8+delta thin films are reported. The temperature dependence of cotTHETA(H), where THETA(H) is the normal-state Hall angle, for a single-phase (2:2:1:2) film sample...

  11. Roadmap: Pan-African Studies Pan-African Studies Bachelor of Arts [AS-BA-PAS-PAS

    E-Print Network [OSTI]

    Sheridan, Scott

    Roadmap: Pan-African Studies ­ Pan-African Studies ­ Bachelor of Arts [AS-BA-PAS-PAS] College: 22-Apr-13/LNHD This roadmap is a recommended semester-by-semester plan of study for this major Non-PAS Elective 3 General Elective (upper division) 9 #12;Roadmap: Pan-African Studies ­ Pan

  12. Electron irradiation of Co, Ni, and P-doped BaFe2As2type iron-based superconductors

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ± superconductivity in the multiband iron-based superconductors [1, 2], with a sign-changing order parameter betweenElectron irradiation of Co, Ni, and P-doped BaFe2As2­type iron-based superconductors Cornelis-scale point-like disorder on superconductivity in these materials [5, 6]. In particular, interband scattering

  13. Office of the Faculty of Engineering Syllabus for the Degree Project for the B.A. in Industrial Design

    E-Print Network [OSTI]

    Office of the Faculty of Engineering Syllabus for the Degree Project for the B.A. in Industrial Design Approved by the Board of the Faculty of Engineering on 2nd March 2009 and valid from 1 st January of compulsory courses that can be accredited to the degree of Bachelor of Arts in Industrial Design. Exemption

  14. Hysteresis analysis of CoTi substituted M-type BaSr hexagonal ferrite Charanjeet Singh a,

    E-Print Network [OSTI]

    Koledintseva, Marina Y.

    Hysteresis analysis of Co­Ti substituted M-type Ba­Sr hexagonal ferrite Charanjeet Singh a, , S.5Sr0.5CoxTixFe(12 - 2x)O19 ferrite have been investigated by XRD, SEM and VSM. XRD and SEM confirm M ferrites are known for their strong uniaxial magne- tocrystalline anisotropy with ease of magnetization

  15. Computer Science Educational Effectiveness Assessment Plan Page 1 of 23 B.S., B.A, Minor in Computer Science

    E-Print Network [OSTI]

    Mock, Kenrick

    Computer Science Educational Effectiveness Assessment Plan Page 1 of 23 B.S., B.A, Minor in Computer Science Educational Effectiveness Assessment Plan Version 1.3 Adopted by The Computer Science of Academic Affairs: #12;Computer Science Educational Effectiveness Assessment Plan Page 2 of 23 TABLE

  16. High temperature thermoelectric properties of Czochralski-pulled Ba8Ga16Ge30 M. Christensen1

    E-Print Network [OSTI]

    High temperature thermoelectric properties of Czochralski-pulled Ba8Ga16Ge30 M. Christensen1 , G, Pasadena, California 91125 Abstract High temperature thermoelectric properties have been measured/m-K around 900K, and ZT reaches a maximum of 0.9 at 1000 K. Introduction The interest in thermoelectric

  17. Oval BA (and the Great Red Spot) extend down to a supersolar water cloud layer in Jupiter's atmosphere

    E-Print Network [OSTI]

    Marcus, Philip S.

    Oval BA (and the Great Red Spot) extend down to a supersolar water cloud layer in Jupiter in Jupiter's troposphere, with stable layers near cloud bases [4,6,7]. We use these two results to determine horizontal band in Fig. 2 shows that vortex- model derived static stability (white bars) is consistent

  18. PETROGRAPHY AND CHEMISTRY OF IMPACT-MELT CLASTS IN APOLLO 16 BRECCIAS. B.A. , S.J. Symes2

    E-Print Network [OSTI]

    Cohen, Barbara Anne

    PETROGRAPHY AND CHEMISTRY OF IMPACT-MELT CLASTS IN APOLLO 16 BRECCIAS. B.A. Cohen1 , S.J. Symes2 samples of unequivocal impact origin, from either the Apollo collection or lunar meteorites, suggest of samples, impact melts and crystalline lunar spherules (CLS) within demonstrably old Apollo breccias

  19. Estimated {sup 55}Mn and {sup 90}Zr Cross Section Covariances in the Fast Neutron Energy Region

    SciTech Connect (OSTI)

    Pigni, M.T. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)], E-mail: pigni@bnl.gov; Herman, M.; Oblozinsky, P. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)

    2008-12-15T23:59:59.000Z

    We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from the keV energy range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by a perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.

  20. La-doped BaTiO{sub 3} heterostructures: Compensating the polarization discontinuity

    SciTech Connect (OSTI)

    Kumah, D. P.; Clarke, R., E-mail: royc@umich.edu [Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States); Yacoby, Y. [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel); Pauli, S. A.; Willmott, P. R. [Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

    2013-12-01T23:59:59.000Z

    We demonstrate a route to manipulate the polarization and internal electric field of a complex oxide heterostructure using a layering sequence based on the LaAlO{sub 3}-SrTiO{sub 3} interface. By combining sensitive atomic-level mapping of the structure using direct x-ray phase-retrieval methods with theoretical modeling of the electrostatic charge and polarization, we have devised a novel single-domain polar heterostructure. We find that ionic rearrangement results in strain and free energy minimization, and eliminates the polarization discontinuity leading to a two-fold increase of the spontaneous polarization towards the surface of an ultra-thin single-domain BaTiO{sub 3} film.

  1. Microscopic description of spherical to {gamma}-soft shape transitions in Ba and Xe nuclei

    SciTech Connect (OSTI)

    Li, Z. P. [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China); Physics Department, Faculty of Science, University of Zagreb, 10000 Zagreb (Croatia); Niksic, T.; Vretenar, D. [Physics Department, Faculty of Science, University of Zagreb, 10000 Zagreb (Croatia); Meng, J. [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China); School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191 (China)

    2010-03-15T23:59:59.000Z

    The rapid transition between spherical and {gamma}-soft shapes in Ba and Xe nuclei in the mass region A>=130 is analyzed using excitation spectra and collective wave functions obtained by diagonalization of a five-dimensional Hamiltonian for quadrupole vibrational and rotational degrees of freedom, with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes. The results reproduce the characteristic evolution of excitation spectra and E2 transition probabilities, and in general, a good agreement with available data is obtained. The calculated spectra display fingerprints of a second-order shape phase transition that can approximately be described by analytic solutions corresponding to the E(5) dynamical symmetry.

  2. Precipitation method for barium metaborate (BaB{sub 2}O{sub 4}) synthesis from borax solution

    SciTech Connect (OSTI)

    Ak?ener, Eymen; Figen, Aysel Kantürk; Pi?kin, Sabriye [Yildiz Technical University, Chem. Eng. Dept., Davutpasa Campus, 34210, Istanbul (Turkey)

    2013-12-16T23:59:59.000Z

    In this study, barium metaborate (BaB{sub 2}O{sub 4}, BMB) synthesis from the borax solution was carried out. BMB currently is used in production of ceramic glazes, luminophors, oxide cathodes as well as additives to pigments for aqueous emulsion paints and also ??BaB{sub 2}O{sub 4} single crystals are the best candidate for fabrication of solid-state UV lasers operating at a wavelength of 200 nm due to excellent nonlinear optical properties. In the present study, synthesis was carried out from the borax solution (Na{sub 2}B{sub 4}O{sub 7?}10H{sub 2}O, BDH) and barium chloride (BaCI{sub 2?}2H{sub 2}O, Ba) in the glass-batch reactor with stirring. The effect of, times (5-15 min), molar ratio [stoich.ration (1.0:2.0), 1.25:2.0, 1.5:2.0, 2.5:2:0, 3.0:2.0, 3.5:2.0,4.0:2.0, 5.0:2.0] and also crystallization time (2-6 hour) on the BMB yield (%) was investigated at 80 °C reaction temperature. It is found that, BMB precipitation synthesis with 90 % yield can be performed from 0.50 molar ration (BDH:Ba), under 80 °C, 15 minute, and 6 hours crystallization time. The structural properties of BMB powders were characterized by using XRD, FT-IR and DTA-TG instrumental analysis technique.

  3. Investigation of novel decay B _____ ____(2S)____K at BaBar

    SciTech Connect (OSTI)

    Schalch, Jacob; /Oberlin Coll. /SLAC

    2011-06-22T23:59:59.000Z

    We investigate the undocumented B meson decay, B{sup +} {yields} {Psi}(2S){omega}K{sup +}. The data were collected with the BaBar detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} collier operating at the {gamma}(4S) resonance, a center-of-mass energy of 10.58 GeV/c{sup 2}. The {gamma}(4S) resonance primarily decays to pairs of B-mesons. The BaBar collaboration at the PEP-II ring was located at the SLAC National Accelerator Laboratory and was designed to study the collisions of positrons and electrons. The e{sup -}e{sup +} pairs collide at asymmetric energies, resulting in a center of mass which is traveling at relativistic speeds. The resulting time dilation allows the decaying particles to travel large distances through the detector before undergoing their rapid decays, a process that occurs in the in the center of mass frame over extremely small distances. As they travel through silicon vertex trackers, a drift chamber, a Cerenkov radiation detector and finally an electromagnetic calorimeter, we measure the charge, energy, momentum, and particle identification in order to reconstruct the decays that have occurred. While all well understood mesons currently fall into the qq model, the quark model has no a priori exclusion of higher configuration states such as qqqq which has led experimentalists and theorists alike to seek evidence supporting the existence of such states. Currently, there are hundreds of known decay modes of the B mesons cataloged by the Particle Data Group, but collectively they only account for approximately 60% of the B branching fraction and it is possible that many more exist.

  4. Investigations of Ba{sub x}Sr{sub 1?x}TiO{sub 3} ceramics and powders prepared by direct current arc discharge technique

    SciTech Connect (OSTI)

    Li, Shuangbin; Wang, Xiaohan [Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Yao, Ying, E-mail: yaoy1125@hotmail.com; Jia, Yongzhong; Xie, Shaolei; Jing, Yan [Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008 (China); Yuzyuk, Yu. I. [Faculty of Physics, Southern Federal University, 5, Zorge str., Rostov-on-Don 344090 (Russian Federation)

    2014-09-01T23:59:59.000Z

    Ba{sub x}Sr{sub 1?x}TiO{sub 3} ceramics with x ranging from 0 to 1 were prepared by direct current arc discharge technique and studied by means of x-ray diffraction (XRD) and Raman spectroscopy. The cubic-tetragonal ferroelectric phase transition in Ba{sub x}Sr{sub 1?x}TiO{sub 3} ceramics was found to occur at x???0.75. XRD investigation of as-grown BaTiO{sub 3} ceramics revealed co-existence of tetragonal and hexagonal modifications with a small amount of impurity phase BaTi{sub 4}O{sub 9}. No evidences of hexagonal phase were observed in Raman spectra of as-grown BaTiO{sub 3} ceramics, while Raman peaks related to hexagonal phase were clearly observed in the spectrum of fine-grain powders prepared from the same ceramics. A core-shell model for BaTiO{sub 3} ceramics prepared by direct current arc discharge technique is proposed. Absence of the hexagonal phase in any Ba{sub x}Sr{sub 1?x}TiO{sub 3} solid solution with x?

  5. Novel kinds of down/up-conversion luminescent rare earth doped fluoride BaMgF{sub 4}: RE{sup 3+} microcrystals

    SciTech Connect (OSTI)

    Yan, Zhi-Yuan; Yan, Bing, E-mail: byan@tongji.edu.cn; Jia, Li-Ping

    2013-10-15T23:59:59.000Z

    Graphical abstract: We achieve the liquid phase chemical synthesis of rare earth fluoride system BaMgF4: RE{sup 3+} microphosphors, which realize down/up-conversion luminescence. - Highlights: • Doped BaMgF{sub 4} microphosphors are firstly prepared by hydrothermal process. • Doped BaMgF{sub 4} nanosheets are firstly prepared by high temperature solution reaction. • The down-conversion luminescence is realized in the rare earth doped BaMgF{sub 4}. • The upconversion luminescence is realized in the rare earth doped BaMgF{sub 4}. - Abstract: In this paper, we realize the liquid-phase chemical synthesis of high-quality orthorhombic polycrystalline BaMgF{sub 4}: RE{sup 3+} (RE = Eu, Tb, Sm, Dy, Yb–Er/Tm) compounds with hydrothermal and high-temperature solution methods, respectively. The products from hydrothermal technology show the micrometer size while the products from hydrothermal technology present nanosheet morphology. The rare earth ions doped BaMgF{sub 4} from hydrothermal synthesis are discussed in details, which can realize the downconversion luminescence for doped Eu{sup 3+} or Tb{sup 3+} and upconversion luminescence for Yb{sup 3+}/Er{sup 3+} (Tm{sup 3+}), respectively. To our knowledge, the hydrothermal or high temperature solution synthesis and photoluminescence (Eu{sup 3+}, Tb{sup 3+} or Yb{sup 3+}/Er{sup 3+}(Tm{sup 3+})) of these fluoride systems are firstly reported.

  6. Use of Sm-123 + Sm-211 Mixed-powder Buffers to Assist the Growth of SmBCO and ZrO2-doped SmBCO Single Grain, Bulk Superconductors

    E-Print Network [OSTI]

    Zhao, Wen; Shi, Yunhua; Dennis, Anthony R.; Cardwell, David A.

    2014-12-18T23:59:59.000Z

    . Murakami, and I. Hirabayashi, "High critical current density in RE–Ba–Cu–O bulk superconductors with very fine RE2BaCuO5 particles," Physica C: Superconductivity, vol. 412-414, no. 1, pp. 557–565, Oct. 2004. [4] H. S. Chauhan, and M. Murakami, "Hot... )–Ba–Cu–O superconductors," Nature Materials, vol. 4, pp. 476 - 480, Jun. 2005. [7] N. H. Babu, K. Iida, Y. Shi, and D. A. Cardwell, "Processing of high performance (LRE)-Ba–Cu–O large, single-grain bulk superconductors in air," Physica C: Superconductivity, vol. 445...

  7. A first-principles density functional theory study of the electronic structural and thermodynamic properties of M2ZrO3 and M2CO3 (M=Na, K) and their capabilities for CO2 capture

    SciTech Connect (OSTI)

    Yuhua Duan

    2012-01-01T23:59:59.000Z

    Alkali metal zirconates could be used as solid sorbents for CO{sub 2} capture. The structural, electronic, and phonon properties of Na{sub 2}ZrO{sub 3}, K{sub 2}ZrO{sub 3}, Na{sub 2}CO{sub 3}, and K{sub 2}CO{sub 3} are investigated by combining the density functional theory with lattice phonon dynamics. The thermodynamics of CO{sub 2} absorption/desorption reactions of these two zirconates are analyzed. The calculated results show that their optimized structures are in a good agreement with experimental measurements. The calculated band gaps are 4.339 eV (indirect), 3.641 eV (direct), 3.935 eV (indirect), and 3.697 eV (direct) for Na{sub 2}ZrO{sub 3}, K{sub 2}ZrO{sub 3}, Na{sub 2}CO{sub 3}, and K{sub 2}CO{sub 3}, respectively.The calculated phonon dispersions and phonon density of states for M{sub 2}ZrO{sub 3} and M{sub 2}CO{sub 3} (M = K, Na, Li) revealed that from K to Na to Li, their frequency peaks are shifted to high frequencies due to the molecular weight decreased from K to Li. From the calculated reaction heats and relationships of free energy change versus temperatures and CO{sub 2} pressures of the M{sub 2}ZrO{sub 3} (M = K, Na, Li) reacting with CO{sub 2}, we found that the performance of Na{sub 2}ZrO{sub 3} capturing CO{sub 2} is similar to that of Li{sub 2}ZrO{sub 3} and is better than that of K{sub 2}ZrO{sub 3}. Therefore, Na{sub 2}ZrO{sub 3} and Li{sub 2}ZrO{sub 3} are good candidates of high temperature CO{sub 2} sorbents and could be used for post combustion CO{sub 2} capture technologies.

  8. Specification of CuCrZr Alloy Properties after Various Thermo-Mechanical Treatments and Design Allowables including Neutron Irradiation Effects

    SciTech Connect (OSTI)

    Barabash, Vladimir [ITER Organization, Saint Paul Lez Durance, France] [ITER Organization, Saint Paul Lez Durance, France; Kalinin, G. M. [RDIPE, P.O. Box 788, 101000 Moscow, Russia] [RDIPE, P.O. Box 788, 101000 Moscow, Russia; Fabritsiev, Sergei A. [D.V. Efremov Scientific Research Institute, St. Petersburg, Russia] [D.V. Efremov Scientific Research Institute, St. Petersburg, Russia; Zinkle, Steven J [ORNL] [ORNL

    2012-01-01T23:59:59.000Z

    Precipitation hardened CuCrZr alloy is a promising heat sink and functional material for various applica- tions in ITER, for example the first wall, blanket electrical attachment, divertor, and heating systems. Three types of thermo-mechanical treatment were identified as most promising for the various applica- tions in ITER: solution annealing, cold working and ageing; solution annealing and ageing; solution annealing and ageing at non-optimal condition due to specific manufacturing processes for engineer- ing-scale components. The available data for these three types of treatments were assessed and mini- mum tensile properties were determined based on recommendation of Structural Design Criteria for the ITER In-vessel Components. The available data for these heat treatments were analyzed for assess- ment of neutron irradiation effect. Using the definitions of the ITER Structural Design Criteria the design allowable stress intensity values are proposed for CuCrZr alloy after various heat treatments.

  9. Data:85ed0bec-9f0b-4c0c-b7df-7552714728ba | Open Energy Information

    Open Energy Info (EERE)

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  10. Data:D2d5e5ec-0361-4cdb-8855-0ee359ba1f27 | Open Energy Information

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  11. Data:8e449c5c-00e4-47a0-ba6d-17eeb6c671f8 | Open Energy Information

    Open Energy Info (EERE)

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  12. Structural and magnetic properties and superconductivity in Ba(Fe{sub 1-x}TM{sub x}){sub 2}As{sub 2}

    SciTech Connect (OSTI)

    Thaler, Alexander

    2012-07-23T23:59:59.000Z

    We studied the effects on structural and magnetic phase transitions and the emergence of superconductivity in transition metal substituted BaFe{sub 2}As{sub 2}. We grew four series of Ba(Fe{sub 1-x}TM{sub x}){sub 2}As{sub 2} (TM=Ru, Mn, Co+Cr and Co+Mn) and characterized them by crystallographic, magnetic and transport measurements. We also subjected Ba(Fe{sub 1-x}Cr{sub x}){sub 2}As{sub 2} and Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} to heat treatment to explore what changes might be induced.

  13. Data:5fec70a4-9a2b-44ba-9633-a56fd0275901 | Open Energy Information

    Open Energy Info (EERE)

    fec70a4-9a2b-44ba-9633-a56fd0275901 No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading......

  14. Data:07657709-0dbd-4f7d-9ba5-16de8191e070 | Open Energy Information

    Open Energy Info (EERE)

    d-9ba5-16de8191e070 No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading... 1. Basic...

  15. Is the Communicative Language Teaching Approach More Effective Than the Grammar Translation Method at Teaching the Ba-Construction in Mandarin Chinese to American Undergraduate Students?

    E-Print Network [OSTI]

    Wang, Jun

    2013-12-31T23:59:59.000Z

    (CLT) with that of Grammar Translation Method (GT) at teaching Chinese as a foreign language (CFL). The present study fills this gap. The purpose of this study is to investigate quantitatively which method is more effective at teaching the ba...

  16. Temperature and composition phase diagram in the iron-based ladder compounds Ba 1 - x Cs x Fe 2 Se 3

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Hawai, Takafumi; Nambu, Yusuke; Ohgushi, Kenya; Du, Fei; Hirata, Yasuyuki; Avdeev, Maxim; Uwatoko, Yoshiya; Sekine, Yurina; Fukazawa, Hiroshi; Ma, Jie; Chi, Songxue; Ueda, Yutaka; Yoshizawa, Hideki; Sato, Taku J.

    2015-05-01T23:59:59.000Z

    We investigated the iron-based ladder compounds (Ba,Cs)Fe?Se?. Their parent compounds BaFe?Se? and CsFe?Se? have different space groups, formal valences of Fe, and magnetic structures. Electrical resistivity, specific heat, magnetic susceptibility, x-ray diffraction, and powder neutron diffraction measurements were conducted to obtain a temperature and composition phase diagram of this system. Block magnetism observed in BaFe?Se? is drastically suppressed with Cs doping. In contrast, stripe magnetism observed in CsFe?Se? is not so fragile against Ba doping. A new type of magnetic structure appears in intermediate compositions, which is similar to stripe magnetism of CsFe?Se?, but interladder spin configuration is different. Intermediate compounds show insulating behavior, nevertheless a finite T-linear contribution in specific heat was obtained at low temperatures.

  17. JOURNAL DE PHYSIQUE Colfoque Cl, supplkrnent au no 4, Tome 38, Auril 1977, page Cl-333 METAL-OXIDES COMPOSITES FOR BaFe,,Ol PERMANENT MAGNETS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    the possibility of producing composites of Ba ferrite with various metals such as cobalt, nickel, iron, copper of a CO deposit with preferential orientation obtained by chemical reduction and electrodeposition. 2. CO

  18. Influence of crystalline phase and defects in the ZrO{sub 2} nanoparticles synthesized by thermal plasma route on its photocatalytic properties

    SciTech Connect (OSTI)

    Nawale, Ashok B.; Kanhe, Nilesh S.; Bhoraskar, S.V. [Department of Physics, University of Pune, Pune 411007 (India)] [Department of Physics, University of Pune, Pune 411007 (India); Mathe, V.L., E-mail: vlmathe@physics.unipune.ac.in [Department of Physics, University of Pune, Pune 411007 (India); Das, A.K. [Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)] [Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)

    2012-11-15T23:59:59.000Z

    Graphical abstract: Thermal plasma synthesized nanophase zirconia showing the blue shift in the band gap of monoclinic phase as found from the photoabsorption spectroscopy was found to be the dominant parameter for the enhancement in its photocatalytic activity. The existence of different defect states and their concentration in as synthesized samples also inferred from the photoabsorption measurements were also found to be responsible for the enhanced photocatalytic activity of the samples. Highlights: ? Phase controlled structural formation of nanophase ZrO{sub 2} by thermal plasma route. ? Enhanced photocatalytic degradation rate of methylene blue dye. ? The blue shift in the band gap of monoclinic phase of nanocrystalline ZrO{sub 2}. ? Existence of different defect states in the as synthesized nano phase ZrO{sub 2}. ? Several competing processes which controls the photocatalytic degradation rate. -- Abstract: The photocatalytic activity of pure ZrO{sub 2} samples, prepared by a thermal plasma route, and characterized by X-ray diffraction technique was tested for the degradation of methylene blue, which is known to be a hazardous dye. Although, all these samples synthesized at different operating pressures of the thermal plasma reactor showed the photocatalytic activity; the sample synthesized at 1.33 bar of operating pressure showed the highest photocatalytic activity. The blue shift in the band gap of monoclinic phase, as observed from the photo-absorption spectroscopy, may be attributed to the enhanced photocatalytic activity. The existence of different defect states and their concentration as, inferred from the photo-absorption measurements were also found to be responsible for the enhanced photocatalytic activity of the as synthesized samples.

  19. Preparation of Lead Zirconate Titanate (Pb(Zr0.52Ti0.48)O3) by Homogeneous Precipitation and Calcination

    E-Print Network [OSTI]

    Tas, A. Cuneyt

    Preparation of Lead Zirconate Titanate (Pb(Zr0.52Ti0.48)O3) by Homogeneous Precipitation-ray spectroscopy (EDXS). I. Introduction LEAD ZIRCONATE TITANATE (PbZrxTi1-xO3) ceramics are of great technological, and TiO2). However, because of intermediate reactions which lead to the formation of PbTiO3 (PT) and Pb

  20. Density functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100)

    E-Print Network [OSTI]

    Kummel, Andrew C.

    Density functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100) T.J. Grassman on the Ge(100)-4 Â 2 surface. Surface binding geometries of metal-down (O­M­Ge) and oxygen-down (M­ O­Ge) were considered, including both adsorbate and displacement geometries of M­O­Ge. Calculated enthalpies

  1. Thermodynamic Assessment of Hot Corrosion Mechanisms of Superalloys Hastelloy N and Haynes 242 in Eutectic Mixture of Molten Salts KF and ZrF4

    SciTech Connect (OSTI)

    Michael V. Glazoff

    2012-02-01T23:59:59.000Z

    The KF - ZrF4 system was considered for the application as a heat exchange agent in molten salt nuclear reactors (MSRs) beginning with the work carried out at ORNL in early fifties. Based on a combination of excellent properties such as thermal conductivity, viscosity in the molten state, and other thermo-physical and rheological properties, it was selected as one of possible candidates for the nuclear reactor secondary heat exchanger loop.

  2. Surface Passivation of Nanoporous TiO2 via Atomic Layer Deposition of ZrO2 for Solid-State Dye-Sensitized Solar Cell Applications

    E-Print Network [OSTI]

    to the spiro-OMeTAD. Introduction Dye-sensitized solar cells (DSCs) based on mesoporous titania and liquidSurface Passivation of Nanoporous TiO2 via Atomic Layer Deposition of ZrO2 for Solid-State Dye-Sensitized Solar Cell Applications Tina C. Li, Ma´rcio S. Go´es,,§ Francisco Fabregat-Santiago,*, Juan Bisquert

  3. Heat capacity of the site-diluted spin dimer system Ba?(Mn1-xVx)?O?

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Samulon, E. C.; Shapiro, M. C.; Fisher, I. R.

    2011-08-01T23:59:59.000Z

    Heat-capacity and susceptibility measurements have been performed on the diluted spin dimer compound Ba?(Mn1-xVx)?O?. The parent compound Ba?Mn?O? is a spin dimer system based on pairs of antiferromagnetically coupled S=1, 3d² Mn?? ions such that the zero-field ground state is a product of singlets. Substitution of nonmagnetic S=0, 3d? V?? ions leads to an interacting network of unpaired Mn moments, the low-temperature properties of which are explored in the limit of small concentrations 0?x?0.05. The zero-field heat capacity of this diluted system reveals a progressive removal of magnetic entropy over an extended range of temperatures, with no evidence for a phase transition. The concentration dependence does not conform to expectations for a spin-glass state. Rather, the data suggest a low-temperature random singlet phase, reflecting the hierarchy of exchange energies found in this system.

  4. Coherency strain enhanced dielectric-temperature property of rare-earth doped BaTiO{sub 3}

    SciTech Connect (OSTI)

    Jeon, Sang-Chae; Kang, Suk-Joong L. [Materials Interface Laboratory, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)] [Materials Interface Laboratory, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

    2013-03-18T23:59:59.000Z

    Core/shell-grained BaTiO{sub 3} samples were prepared with addition of rare earth elements. The core/shell interface was semi-coherent, and many misfit dislocations formed in Dy-doped samples. In contrast, a coherent interface and few dislocations were observed in Ho- and Er-doped samples. Dy-doped samples exhibited poor temperature stability, showing a peak with no frequency dispersion. Ho- and Er-doped samples exhibited a broad curve with frequency dispersion. This improved temperature stability is attributed to the coherency strain, which leads to the formation of polar nano-regions in the shell. Coherency at the core/shell interface is critical to improve the temperature stability of core/shell-structured BaTiO{sub 3}.

  5. Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

    SciTech Connect (OSTI)

    Lumsden, Mark D [ORNL; Christianson, Andrew D [ORNL; Parshall, Daniel [ORNL; Stone, Matthew B [ORNL; Nagler, Stephen E [ORNL; Mook Jr, Herbert A [ORNL; Lokshin, Konstantin A [ORNL; Egami, Takeshi [ORNL; Abernathy, Douglas L [ORNL; Goremychkin, E. A. [ISIS Facility, Rutherford Appleton Laboratory; Osborn, R. [Argonne National Laboratory (ANL); McGuire, Michael A [ORNL; Safa-Sefat, Athena [ORNL; Jin, Rongying [ORNL; Sales, Brian C [ORNL; Mandrus, David [ORNL

    2009-01-01T23:59:59.000Z

    Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 clearly reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. The scattering is much broader in L than are spin waves observed in the parent compound BaFe2As2 indicating that the excitations in the superconducting material are more two-dimensional in nature. The excitation appears gapless for T > TC and becomes gapped on cooling below TC. The observed gap energy is approximately 9.6 meV corresponding to 5 kBTC which is remarkably similar to the canonical value for the resonance energy in the cuprates.

  6. Behavior of vortices near twin boundaries in underdoped Ba(Fe 1 ? x Co x ) 2 As 2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kalisky, B.; Kirtley, J. R.; Analytis, J. G.; Chu, J.-H.; Fisher, I. R.; Moler, K. A.

    2011-02-01T23:59:59.000Z

    We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCox)?As?. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)?As?. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

  7. The Magnetic Sensitivity of the Ba II D1 and D2 Lines of the Fraunhofer Spectrum

    E-Print Network [OSTI]

    Luca Belluzzi; Javier Trujillo Bueno; Egidio Landi Degl'Innocenti

    2007-04-30T23:59:59.000Z

    The physical interpretation of the spectral line polarization produced by the joint action of the Hanle and Zeeman effects offers a unique opportunity to obtain empirical information about hidden aspects of solar and stellar magnetism. To this end, it is important to achieve a complete understanding of the sensitivity of the emergent spectral line polarization to the presence of a magnetic field. Here we present a detailed theoretical investigation on the role of resonance scattering and magnetic fields on the polarization signals of the Ba II D1 and D2 lines of the Fraunhofer spectrum, respectively at 4934 \\AA\\ and 4554 \\AA. We adopt a three-level model of Ba II, and we take into account the hyperfine structure that is shown by the $^{135}$Ba and $^{137}$Ba isotopes. Despite of their relatively small abundance (18%), the contribution coming from these two isotopes is indeed fundamental for the interpretation of the polarization signals observed in these lines. We consider an optically thin slab model, through which we can investigate in a rigorous way the essential physical mechanisms involved (resonance polarization, Zeeman, Paschen-Back and Hanle effects), avoiding complications due to radiative transfer effects. We assume the slab to be illuminated from below by the photospheric solar continuum radiation field, and we investigate the radiation scattered at 90 degrees, both in the absence and in the presence of magnetic fields, deterministic and microturbulent. We show in particular the existence of a differential magnetic sensitivity of the three-peak Q/I profile that is observed in the D2 line in quiet regions close to the solar limb, which is of great interest for magnetic field diagnostics.

  8. High field nuclear magnetic resonance in transition metal substituted BaFe{sub 2}As{sub 2}

    SciTech Connect (OSTI)

    Garitezi, T. M., E-mail: thalesmg@ifi.unicamp.br; Lesseux, G. G.; Rosa, P. F. S.; Adriano, C.; Pagliuso, P. G.; Urbano, R. R. [Instituto de Física “Gleb Wataghin,” UNICAMP, Campinas, SP 13083-859 (Brazil); Reyes, A. P.; Kuhns, P. L. [National High Magnetic Field Laboratory, FSU, Tallahassee, Florida 32306-4005 (United States)

    2014-05-07T23:59:59.000Z

    We report high field {sup 75}As nuclear magnetic resonance (NMR) measurements on Co and Cu substituted BaFe{sub 2}As{sub 2} single crystals displaying same structural/magnetic transition T{sub 0}?128??K. From our anisotropy studies in the paramagnetic state, we strikingly found virtually identical quadrupolar splitting and consequently the quadrupole frequency ?{sub Q}?2.57(1)??MHz for both compounds, despite the claim that each Cu delivers 2 extra 3d electrons in BaFe{sub 2}As{sub 2} compared to Co substitution. These results allow us to conclude that a subtle change in the crystallographic structure, particularly in the Fe–As tetrahedra, must be the most probable tuning parameter to determine T{sub 0} in this class of superconductors rather than electronic doping. Furthermore, our NMR data around T{sub 0} suggest coexistence of tetragonal/paramagnetic and orthorhombic/antiferromagnetic phases between the structural and the spin density wave magnetic phase transitions, similarly to what was reported for K-doped BaFe{sub 2}As{sub 2} [Urbano et al., Phys. Rev. Lett. 105, 107001 (2010)].

  9. Structural and magnetic properties of the Kagome antiferromagnet YbBaCo{sub 4}O{sub 7}

    SciTech Connect (OSTI)

    Huq, A. [Intense Pulsed Neutron Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States); Mitchell, J.F. [Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)]. E-mail: mitchell@anl.gov; Zheng, H. [Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States); Chapon, L.C. [ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX (United Kingdom); Radaelli, P.G. [ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX (United Kingdom); Knight, K.S. [ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX (United Kingdom); Stephens, P.W. [Department of Physics and Astronomy, SUNY Stonybrook, NY 11794 (United States)

    2006-04-15T23:59:59.000Z

    The mixed-valent compound YbBaCo{sub 4}O{sub 7} is built up of Kagome sheets of CoO{sub 4} tetrahedra, linked in the third dimension by a triangular layer of CoO{sub 4} tetrahedra in an analogous fashion to that found in the known geometrically frustrated magnets such as pyrochlores and SrCr{sub 9} {sub x} Ga{sub 12-9} {sub x} O{sub 19} (SCGO). We have undertaken a study of the structural and magnetic properties of this compound using combined high-resolution powder neutron and synchrotron X-ray diffraction. YbBaCo{sub 4}O{sub 7} undergoes a first-order trigonal{sup {yields}}orthorhombic phase transition at 175 K. We show that this transition occurs as a response to a markedly underbonded Ba{sup 2+} site in the high-temperature phase and does not appear to involve charge ordering of Co{sup 2+}/Co{sup 3+} ions in the tetrahedra. The symmetry lowering relieves the geometric frustration of the structure, and a long-range-ordered 3-D antiferromagnetic state develops below 80 K.

  10. High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O

    DOE Patents [OSTI]

    Ginley, D.S.; Hietala, V.M.; Hohenwarter, G.K.G.; Martens, J.S.; Plut, T.A.; Tigges, C.P.; Vawter, G.A.; Zipperian, T.E.

    1994-10-25T23:59:59.000Z

    A process is disclosed for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO[sub 3] crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O[sub 3], followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry. 8 figs.

  11. Measurement of D0-D0bar Mixing and CP Violation at BaBar

    E-Print Network [OSTI]

    Giulia Casarosa; for the BaBar Collaboration

    2012-08-31T23:59:59.000Z

    We report on a measurement of D0-D0bar mixing and a search for CP violation in the D0->K+K-, pi+pi- and K+-pi-+ channels. We use D0's coming from D*+ decays, so that the flavour of the D0 at production is tagged by the charge of the pion that is also emitted. We also use an independent set of D0's coming directly from the hadronization of the charm quark, but in this case the flavour of the charmed meson is not known. We analyze events collected by the BaBar experiment at the PEP-II asymmetric-energy e+e- collider, corresponding to an integrated luminosity of 468 fb-1. We measure the mixing parameter value to be yCP = [0.72 +- 0.18 (stat) +- 0.12 (syst)]%, and exclude the no-mixing hypothesis at 3.3sigma significance. We find no evidence of CP violation, observing DeltaY = [0.09 +- 0.26 (stat) +- 0.06 syst)]% which is consistent with zero.

  12. Casting evaluation of U-Zr alloy system fuel slug for SFR prepared by injection casting method

    SciTech Connect (OSTI)

    Song, Hoon; Kim, Jong-Hwan; Kim, Ki-Hwan; Lee, Chan-Bock [Korea Atomic Energy Research Institute, Daedeok-daro 989-111, Yuseong-gu, Daejeon (Korea, Republic of)

    2013-07-01T23:59:59.000Z

    Metal fuel slugs of U-Pu-Zr alloys for Sodium-cooled Fast Reactor (SFR) have conventionally been fabricated by a vacuum injection casting method. Recently, management of minor actinides (MA) became an important issue because direct disposal of the long-lived MA can be a long-term burden for a tentative repository up to several hundreds of thousand years. In order to recycle transuranic elements (TRU) retained in spent nuclear fuel, remote fabrication capability in a shielded hot cell should be prepared. Moreover, generation of long-lived radioactive wastes and loss of volatile species should be minimized during the recycled fuel fabrication step. In order to prevent the evaporation of volatile elements such as Am, alternative fabrication methods of metal fuel slugs have been studied applying gravity casting, and improved injection casting in KAERI, including melting under inert atmosphere. And then, metal fuel slugs were examined with casting soundness, density, chemical analysis, particle size distribution and microstructural characteristics. Based on these results there is a high level of confidence that Am losses will also be effectively controlled by application of a modest amount of overpressure. A surrogate fuel slug was generally soundly cast by improved injection casting method, melted fuel material under inert atmosphere.

  13. Shell Model Monte Carlo method in the $pn$-formalism and applications to the Zr and Mo isotopes

    E-Print Network [OSTI]

    C. Ozen; D. J. Dean

    2005-08-05T23:59:59.000Z

    We report on the development of a new shell-model Monte Carlo algorithm which uses the proton-neutron formalism. Shell model Monte Carlo methods, within the isospin formulation, have been successfully used in large-scale shell-model calculations. Motivation for this work is to extend the feasibility of these methods to shell-model studies involving non-identical proton and neutron valence spaces. We show the viability of the new approach with some test results. Finally, we use a realistic nucleon-nucleon interaction in the model space described by (1p_1/2,0g_9/2) proton and (1d_5/2,2s_1/2,1d_3/2,0g_7/2,0h_11/2) neutron orbitals above the Sr-88 core to calculate ground-state energies, binding energies, B(E2) strengths, and to study pairing properties of the even-even 90-104 Zr and 92-106 Mo isotope chains.

  14. Soft and hybrid-doped Pb(Zr,Ti)O{sub 3} ceramics under stress, electric field, and temperature loading

    SciTech Connect (OSTI)

    Suchanicz, J.; Kim-Ngan, N.-T.; Konieczny, K.; Jankowska-Sumara, I. [Institute of Physics, Pedagogical University, ul. Podchorazych 2, 30-084 Krakow (Poland); Balogh, A. G. [Institute of Materials Science, Technische Universitaet Darmstadt, Petersenstrasse 23, 64287 Darmstadt (Germany)

    2011-05-15T23:59:59.000Z

    We investigated the influence of uniaxial pressure (0-1000 bars) applied parallelly or perpendicularly to the ac or dc electric field (in a one-dimensional or two-dimensional manner) on dielectric and ferroelectric properties of selected soft and hybrid-doped PZT ceramics (1 mol. % Gd, 1 mol. % La and 1 mol. % (La+Fe)-doped Pb(Zr{sub 0.54}Ti{sub 0.46}) O{sub 3}). Applying uniaxial pressure leads to a reduction of the peak intensity of the electric permittivity ({epsilon}), of the frequency dispersion, and of the dielectric hysteresis. The peak intensity of {epsilon} becomes diffused and shifts to a higher temperatures with increasing pressure. Simultaneous application of uniaxial pressure and dc electric field (perpendicular to each other) in the poling process implies in improvement of the ferroelectric properties, indicating a new possibility for poling materials with a high coercive field and/or high electric conductivity. It was also found that simultaneous application of uniaxial pressure and dc electric field (perpendicular to each other) allowed observation of the space charge in the depolarization process. The electrostrictive coefficient Q{sub 11} and differential permittivity were evaluated from obtained data. Our results show that applying uniaxial pressure induces similar effects as increasing the Ti-ion concentration in the PZT system. We interpreted our results based on the Cochran soft-mode and domain switching processes under the action of pressure.

  15. Fluorine sites in glasses and transparent glass-ceramics of the system Na{sub 2}O/K{sub 2}O/Al{sub 2}O{sub 3}/SiO{sub 2}/BaF{sub 2}

    SciTech Connect (OSTI)

    Bocker, Christian, E-mail: christian.bocker@uni-jena.d [Otto-Schott-Institut, Jena University, Fraunhoferstr. 6, 07743 Jena (Germany); Munoz, Francisco; Duran, Alicia [Instituto de Ceramica y Vidrio (CSIC), Kelsen 5, 28049 Madrid (Spain); Ruessel, Christian [Otto-Schott-Institut, Jena University, Fraunhoferstr. 6, 07743 Jena (Germany)

    2011-02-15T23:59:59.000Z

    The transparent glass-ceramics obtained in the silicate system Na{sub 2}O/K{sub 2}O/SiO{sub 2}/BaF{sub 2} show homogeneously dispersed BaF{sub 2} nano crystals with a narrow size distribution. The X-ray diffraction and the nuclear magnetic resonance spectroscopy were applied to glasses and the respective glass-ceramics in order to clarify the crystallization mechanism and the role of fluorine during crystallization. With an increasing annealing time, the concentration and also the number of crystals remain approximately constant. With an increasing annealing temperature, the crystalline fraction increases until a saturation limit is reached, while the number of crystals decreases and the size of the crystals increases. Fluoride in the glassy network occurs as Al-F-Ba, Al-F-Na and also as Ba-F structures. The latter are transformed into crystalline BaF{sub 2} and fluoride is removed from the Al-F-Ba/Na bonds. However, some fluorine is still present in the glassy phase after the crystallization. -- Graphical abstract: The X-ray diffraction and the nuclear magnetic resonance spectroscopy were applied to glasses in the silicate system Na{sub 2}O/K{sub 2}O/SiO{sub 2}/BaF{sub 2} and the respective glass-ceramics with BaF{sub 2} nano crystals in order to clarify the crystallization mechanism and the role of fluorine during crystallization. Display Omitted Research highlights: {yields} BaF{sub 2} nano crystals are precipitated from a silicate glass system. {yields} Ostwald ripening during the late stage of crystallization does not occur. {yields} Fluorine in the glass is coordinated with Ba as well as Al together with Ba or Na.{yields} In the glass-ceramics, the residual fluorine is coordinated as Al-F-Ba/Na.

  16. First-principles study of structural, electronic, vibrational, dielectric and elastic properties of tetragonal Ba{sub 2}YTaO{sub 6}

    SciTech Connect (OSTI)

    Ganeshraj, C.; Santhosh, P. N., E-mail: santhosh@physics.iitm.ac.in [Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu (India)

    2014-10-14T23:59:59.000Z

    We report first-principles study of structural, electronic, vibrational, dielectric, and elastic properties of Ba{sub 2}YTaO{sub 6}, a pinning material in high temperature superconductors (HTS), by using density functional theory. By using different exchange-correlation potentials, the accuracy of the calculated lattice constants of Ba{sub 2}YTaO{sub 6} has been achieved with GGA-RPBE, since many important physical quantities crucially depend on change in volume. We have calculated the electronic band structure dispersion, total and partial density of states to study the band gap origin and found that Ba{sub 2}YTaO{sub 6} is an insulator with a direct band gap of 3.50?eV. From Mulliken population and charge density studies, we conclude that Ba{sub 2}YTaO{sub 6} have a mixed ionic-covalent character. Moreover, the vibrational properties, born effective charges, and the dielectric permittivity tensor have been calculated using linear response method. Vibrational spectrum determined through our calculations agrees well with the observed Raman spectrum, and allows assignment of symmetry labels to modes. We perform a detailed analysis of the contribution of the various infrared-active modes to the static dielectric constant to explain its anisotropy, while electronic dielectric tensor of Ba{sub 2}YTaO{sub 6} is nearly isotropic, and found that static dielectric constant is in good agreement with experimental value. The six independent elastic constants were calculated and found that tetragonal Ba{sub 2}YTaO{sub 6} is mechanically stable. Other elastic properties, including bulk modulus, shear modulus, Young's modulus, Poisson's ratio, and elastic anisotropy ratios are also investigated and found that Poisson's ratio and Young's modulus of Ba{sub 2}YTaO{sub 6} are similar to that of other pinning materials in HTS.

  17. Properties of polycarbonate containing BaTiO{sub 3} nanoparticles

    SciTech Connect (OSTI)

    Lomax, J. F.; Lomax, E. A.; Lomax, P. Q. [Chemistry Department, U.S. Naval Academy, Annapolis, Maryland 21402 (United States); Fontanella, J. J., E-mail: fontanel@Comcast.net; Edmondson, C. A.; Wintersgill, M. C.; Westgate, M. A. [Physics Department, U.S. Naval Academy, Annapolis, Maryland 21402 (United States); Wolak, M. A. [U.S. Naval Research Lab, Washington, DC 20375 (United States); Bogle, X.; Rúa, A.; Greenbaum, S. G. [Department of Physics and Astronomy, Hunter College, New York, New York 10021 (United States)

    2014-03-14T23:59:59.000Z

    The real part of the relative permittivity, ??, and dielectric loss, tan??, have been determined at audio frequencies at temperatures from about 5?K to 350?K for nano-composites composed of BaTiO{sub 3} nanoparticles and polycarbonate. The room temperature breakdown strength was also measured and thermal analysis, nuclear magnetic resonance and scanning electron microscopy studies were carried out. For some films the nanoparticles were surface-treated (STNP) while for others they were not (UNP). For concentrations of UNP greater than about 3.4 vol. %, ?? is much larger than expected on the basis of laws of mixing. On the other hand, ?? for materials made using STNP is well-behaved. Correspondingly, increased loss (?? or tan??) in the vicinity of room temperature is observed for the materials made from UNP. The anomalously large values of relative permittivity and increased loss are attributed to the presence of large aggregates in the materials made using the UNP. For both UNP-and STNP-based materials, the breakdown strength is found to decrease as nanoparticle concentration increases. The breakdown strength for the materials made using STNP is found to be larger for all concentrations than for those containing UNP despite the presence of large aggregates in some of the STNP-based materials. This shows that breakdown is strongly affected by the nanoparticle surfaces and/or the interface layer. It is also found that the breakdown strength for materials made using UNP increases as particle size increases. Finally, variable temperature and pressure proton nuclear magnetic resonance relaxation measurements were made to assess the effect of nanoparticle inclusion on polymer motion, and the effects were found to be very minor.

  18. JOURNAL DE PHYSIQUE Colloque C8, Supplkment au no 12, Tome 49, dkcembre 1988

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    were Nd16Fe77Bs,SmCo5,Smz(Co,Fe,Cu,Zr)17rstrontium ferrite magnets and single domain particles of Ba

  19. Correlation between upconversion photoluminescence and dielectric response in Ba-substituted (Sr{sub 1?x}Ba{sub x}){sub 4}(La{sub 0.85}Ho{sub 0.025}Yb{sub 0.125}){sub 2}Ti{sub 4}Nb{sub 6}O{sub 30}

    SciTech Connect (OSTI)

    Wei, T., E-mail: weitong.nju@gmail.com [College of Science, Civil Aviation University of China, Tianjin 300300 (China); Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China); Wang, X. D. [College of Science, Civil Aviation University of China, Tianjin 300300 (China); Zhao, C. Z. [School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300160 (China); Liu, M. F.; Liu, J. M., E-mail: liujm@nju.edu.cn [Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)

    2014-06-30T23:59:59.000Z

    The filled tetragonal tungsten bronze (Sr{sub 1?x}Ba{sub x}){sub 4}(La{sub 0.85}Ho{sub 0.025}Yb{sub 0.125}){sub 2}Ti{sub 4}Nb{sub 6}O{sub 30} (SBLTNx: Ho-Yb) ceramics with different Ba substitution levels (x) are prepared. The upconversion photoluminescence (UC-PL) and dielectric permittivity are investigated. The substitution of Sr{sup 2+} ions at the A{sub 2}-sites by larger Ba{sup 2+} ions results in substantial variation of the UC-PL intensity as a function of substitution level x. Furthermore, the dielectric response to the substitution of Sr{sup 2+} by Ba{sup 2+} suggests a close correlation between the UC-PL intensity and dielectric permittivity. The origin for this correlation is discussed based on the random stress field (RSF) model.

  20. Synthesis of BaTiO[subscript 3]-20wt%CoFe[subscript 2]O[subscript 4] Nanocomposites via Spark Plasma Sintering

    SciTech Connect (OSTI)

    Ghosh, Dipankar; Han, Hyuksu; Nino, Juan C.; Subhash, Ghatu; Jones, Jacob L. (Florida)

    2012-10-23T23:59:59.000Z

    Barium titanate-20wt% cobalt ferrite (BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4}) nanocomposites were sintered from nanocrystalline BaTiO{sub 3} and CoFe{sub 2}O{sub 4} powders using spark plasma sintering (SPS) and pressureless sintering (PS) techniques. Using SPS, dense polycrystalline composites were obtained at a sintering temperature as low as 860 C and a time of 5 min whereas PS required a higher sintering temperature (1150 C) and time (120 min) to obtain similarly dense composites. Microstructural analysis of the composites showed that both the techniques retained nanocrystalline grain sizes after sintering. High resolution X-ray diffraction measurements revealed that the BaTiO{sub 3}-20wt%CoFe{sub 2}O{sub 4} composites sintered by the SPS technique did not exhibit formation of any new phase(s) due to reaction between the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases during sintering. However, the PS technique resulted in the formation of additional phases (other than the BaTiO{sub 3} and CoFe{sub 2}O{sub 4} phases) in the composites. While the composites synthesized by SPS were of superior phase-purity, evidence of Fe diffusion from the spinel to the perovskite phase was found from X-ray diffraction and permittivity measurements.

  1. High temperature phase stabilities and electrochemical properties of InBaCo4-xZnxO7 cathodes for intermediate temperature solid oxide fuel cells

    SciTech Connect (OSTI)

    Kim, Jung-Hyun [ORNL; Young Nam, Kim [University of Texas, Austin; Bi, Zhonghe [ORNL; Manthiram, Arumugam [University of Texas, Austin; Paranthaman, Mariappan Parans [ORNL; Huq, Ashfia [ORNL

    2011-01-01T23:59:59.000Z

    InBaCo4-xZnxO7 oxides have been synthesized and characterized as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFC). The effect of Zn substitution for Co on the structure, phase stability, thermal expansion, and electrochemical properties of the InBaCo4-xZnxO7 has been investigated. The increase in the Zn content from x = 1 to 1.5 improves the high temperature phase stability at 600 oC and 700 oC for 100 h, and chemical stability against a Gd0.2Ce0.8O1.9 (GDC) electrolyte. Thermal expansion coefficient (TEC) values of the InBaCo4-xZnxO7 (x = 1, 1.5, 2) specimens were determined to be 8.6 10-6 9.6 10-6 /oC in the range of 80 900 oC, which provides good thermal expansion compatibility with the standard SOFC electrolyte materials. The InBaCo4-xZnxO7 + GDC (50:50 wt. %) composite cathodes exhibit improved cathode performances compared to those obtained from the simple InBaCo4-xZnxO7 cathodes due to the extended triple-phase boundary (TPB) and enhanced oxide-ion conductivity through the GDC portion in the composites.

  2. (Sr,Ba)(Si,Ge){sub 2} for thin-film solar-cell applications: First-principles study

    SciTech Connect (OSTI)

    Kumar, Mukesh, E-mail: Kumar.Mukesh@nims.go.jp, E-mail: mkgarg79@gmail.com [Environmental Remediation Materials Unit, National Institute for Materials Science, Ibaraki 305-0044 (Japan); Umezawa, Naoto [Environmental Remediation Materials Unit, National Institute for Materials Science, Ibaraki 305-0044 (Japan); PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012 (Japan); TU-NIMS Joint Research Center, School of Materials Science and Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin (China); Imai, Motoharu [Superconducting Properties Unit, National Institute for Materials Science, Ibaraki 305-0047 (Japan)

    2014-05-28T23:59:59.000Z

    In order to meet the increasing demand for electric power generation from solar energy conversion, the development of efficient light absorber materials has been awaited. To this end, the electronic and optical properties of advanced alkaline-earth-metals disilicides and digermanides (SrSi{sub 2}, BaSi{sub 2}, SrGe{sub 2}, and BaGe{sub 2}) are studied by means of the density functional theory using HSE06 exchange-correlation energy functional. Our calculations show that all these orthorhombic structured compounds have fundamental indirect band gaps in the range E{sub g} ? 0.89–1.25 eV, which is suitable for solar cell applications. The estimated lattice parameters and band gaps are in good agreement with experiments. Our calculations show that the electronic band structures of all four compounds are very similar except in the vicinity of the ?-point. The valence band of these compounds is made up by Si(Ge)-p states, whereas the conduction band is composed of Sr(Ba)-d states. Their band alignments are carefully determined by estimating the work function of each compound using slab model. The optical properties are discussed in terms of the complex dielectric function ?(?)?=??{sub 1}(?)?+?i?{sub 2}(?). The static and high-frequency dielectric constants are calculated, taking into account the ionic contribution. The absorption coefficient ?(?) demonstrates that a low energy dispersion of the conduction band, which results in a flat conduction band minimum, leads to large optical activity in these compounds. Therefore, alkaline-earth-metals disilicides and digermanides possess great potential as light absorbers for applications in thin-film solar cell technologies.

  3. Synthesis, structural characterization and properties of SrAl{sub 4?x}Ge{sub x}, BaAl{sub 4?x}Ge{sub x}, and EuAl{sub 4?x}Ge{sub x} (x?0.3–0.4)—Rare examples of electron-rich phases with the BaAl{sub 4} structure type

    SciTech Connect (OSTI)

    Zhang, Jiliang; Bobev, Svilen, E-mail: bobev@udel.edu

    2013-09-15T23:59:59.000Z

    Three solid solutions with the general formula AEAl{sub 4?x}Ge{sub x} (AE=Eu, Sr, Ba; 0.32(1)?x?0.41(1)) have been synthesized via the aluminum self-flux method, and their crystal structures have been established from powder and single-crystal X-ray diffraction. They are isotypic and crystallize with the well-known BaAl{sub 4} structure type, adopted by the three AEAl{sub 4} end members. In all structures, Ge substitutes Al only at the 4e Wyckoff site. Results from X-rays photoelectron spectroscopy on EuAl{sub 4?x}Ge{sub x} and EuAl{sub 4} indicate that the interactions between the Eu{sup 2+} cations and the polyanionic framework are enhanced in the Ge-doped structure, despite the slightly elevated Fermi level. Magnetic susceptibility measurements confirm the local moment magnetism, expected for the [Xe]4f{sup 7} electronic configuration of Eu{sup 2+} and suggest strong ferromagnetic interactions at cryogenic temperatures. Resistivity data from single-crystalline samples show differences between the title compounds, implying different bonding characteristics despite the close Debye temperatures. A brief discussion on the observed electron count and homogeneity ranges for AEAl{sub 4?x}Ge{sub x} (AE=Eu, Sr, Ba) is also presented. - Graphical abstract: AEAl{sub 4?x}Ge{sub x} (AE=Eu, Sr, Ba; 0.32(1)?x?0.41(1)), three “electron-rich” phases with BaAl{sub 4} structure type have been synthesized and characterized. Display Omitted - Highlights: • Three BaAl{sub 4}-type ternary aluminum germanides have been synthesized with Eu, Sr and Ba. • Eu, Sr and Ba cations have no apparent influence on the solubility of Ge. • The Ge atoms substitute Al on one of two framework sites, thereby strengthening the interactions between the cations and the polyanionic framework.

  4. Zn-Doping Dependence of Stripe Order in La1.905Ba0.095CuO4

    SciTech Connect (OSTI)

    Hucker, M.; Zimmermann, M.v.; Xu, Z.J.; Wen, J.S.; Gu, G.D.; Tian, W.; Zarestky, J.; Tranquada, J.M.

    2011-04-01T23:59:59.000Z

    The effect of Zn-doping on the stripe order in La{sub 1.905}Ba{sub 0.095}CuO{sub 4} has been studied by means of x-ray and neutron diffraction as well as magnetization measurements. While 1% Zn leads to an increase of the spin stripe order, it unexpectedly causes a wipe out of the visibility of the charge stripe order. A magnetic field of 10 Tesla applied along the c-axis has no reversing effect on the charge order. We compare this observation with the Zn-doping dependence of the crystal structure, superconductivity, and normal state magnetism.

  5. Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF{sub 2} nanogranular films: Structural and magnetic characterization

    SciTech Connect (OSTI)

    Kasiuk, J. V.; Fedotova, J. A. [NC PHEP Belarusian State University, 220040 Minsk (Belarus); Przewoznik, J., E-mail: januszp@agh.edu.pl; Zukrowski, J.; Sikora, M.; Kapusta, Cz. [Department of Solid State Physics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow (Poland); Grce, A. [VIN?A Institute of Nuclear Sciences, Belgrade University, P.O. Box 522, 11001 Belgrade (Serbia); Milosavljevi?, M. [VIN?A Institute of Nuclear Sciences, Belgrade University, P.O. Box 522, 11001 Belgrade (Serbia); Advanced Technology Institute, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)

    2014-07-28T23:59:59.000Z

    The relation between nanoscale structure, local atomic order and magnetic properties of (FeCoZr){sub x}(CaF{sub 2}){sub 100?x} (29???x???73 at.?%) granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1–6??m were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc ?-FeCo(Zr) alloy and insulating fcc CaF{sub 2} matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mössbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65°–74° to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of ?-FeCo(Zr) nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it.

  6. Thickness dependence of magnetoelectric response for composites of Pb(Zr{sub 0.52}Ti{sub 0.48})O{sub 3} films on CoFe{sub 2}O{sub 4} ceramic substrates

    SciTech Connect (OSTI)

    Wang, Jing, E-mail: wang-jing@nuaa.edu.cn; Zhu, Kongjun [State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 (China); Wu, Xia; Deng, Chaoyong [School of Electronics and Information Engineering, Guizhou University, Guiyang 550025 (China); Peng, Renci; Wang, Jianjun [School of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084 (China)

    2014-08-15T23:59:59.000Z

    Using chemical solution spin-coating we grew Pb(Zr{sub 0.52}Ti{sub 0.48})O{sub 3} films of different thicknesses on highly dense CoFe{sub 2}O{sub 4} ceramics. X-ray diffraction revealed no other phases except Pb(Zr{sub 0.52}Ti{sub 0.48})O{sub 3} and CoFe{sub 2}O{sub 4}. In many of these samples we observed typical ferroelectric hysteresis loops, butterfly-shaped piezoelectric strains, and the magnetic-field-dependent magnetostriction. These behaviors caused appreciable magnetoelectric responses based on magnetic-mechanical-electric coupling. Our results indicated that the thickness of the Pb(Zr{sub 0.52}Ti{sub 0.48})O{sub 3} film was important in obtaining strong magnetoelectric coupling.

  7. Critical behavior of the ferromagnetic-paramagnetic phase transition in Fe{sub 90?x}Ni{sub x}Zr{sub 10} alloy ribbons

    SciTech Connect (OSTI)

    Thanh, Tran Dang, E-mail: thanhxraylab@yahoo.com [Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Hanoi (Viet Nam); Huy Dan, Nguyen [Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Hanoi (Viet Nam); Phan, The-Long; Yu, Seong-Cho, E-mail: scyu@chungbuk.ac.kr [Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Kumarakuru, Haridas; Olivier, Ezra J.; Neethling, Johannes H. [Centre for HRTEM, Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth 6031 (South Africa)

    2014-01-14T23:59:59.000Z

    This work presents a detailed study on the critical behavior of the ferromagnetic-paramagnetic (FM-PM) phase transition in Fe{sub 90?x}Ni{sub x}Zr{sub 10} (x?=?0 and 5) alloy ribbons. Basing on field dependences of magnetization (M-H), M{sup 2} versus H/M plots prove the alloys exhibiting a second-order magnetic phase transition. To investigate the nature of the FM-PM phase transition at T{sub C}?=?245 and 306?K for x?=?0 and 5, respectively, we performed a critical-exponent study. The values of critical components ?, ?, and ? determined by using the modified Arrott plots, Kouvel-Fisher (KF), and critical isotherm analyses agree with each other. For x?=?0, the critical parameters ??=?0.365?±?0.013 and ??=?1.615 ± 0.033 are obtained by modified Arrott plots while ??=?0.368?±?0.008 and ??=?1.612?±?0.016 are obtained by the KF method. These values are close to those expected for the 3D-Heisenberg model, revealing short-range FM interactions in Fe{sub 90}Zr{sub 10}. Meanwhile, for x?=?5, the values of the critical parameters ??=?0.423?±?0.008 and ??=?1.325?±?0.036 are obtained by modified Arrott plots, and ??=?0.425?±?0.006 and ??=?1.323?±?0.012 are obtained by the KF method. The falling of the ? value in between the values of the mean-field theory (??=?0.5) and the 3D-Heisenberg model (??=?0.365) indicates an existence of FM short-range order and magnetic inhomogeneity in Fe{sub 85}Ni{sub 5}Zr{sub 10}. With a partial replacement of Ni for Fe in Fe{sub 90?x}Ni{sub x}Zr{sub 10}, the value of the critical exponent ? trends to shift towards that of the mean-field theory. Such the result proves the presence of Ni favors establishing FM long-range order. The nature of this phenomenon is carefully discussed.

  8. Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-? studied using neutron total scattering and Rietveld analysis

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jeong, I.-K.; Lee, Seunghun; Jeong, Se-Young; Won, C. J.; Hur, N.; Llobet, A.

    2011-08-01T23:59:59.000Z

    Oxygen-deficient BaTiO3-? exhibits an insulator-metal transition with increasing ?. We performed neutron total scattering measurements to study structural evolution across an insulator-metal transition in BaTiO3-?. Despite its significant impact on resistivity, slight oxygen reduction (?=0.09) caused only a small disturbance on the local doublet splitting of Ti-O bond. This finding implies that local polarization is well preserved under marginal electric conduction. In the highly oxygen-deficient metallic state (?=0.25), however, doublet splitting of the Ti-O bond became smeared. The smearing of the local Ti-O doublet is complemented with long-range structural analysis and demonstrates that the metallic conduction in the highly oxygen-reducedmore »BaTiO3-? is due to the appearance of nonferroelectric cubic lattice.« less

  9. Structural evolution across the insulator-metal transition in oxygen-deficient BaTiO3-? studied using neutron total scattering and Rietveld analysis

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jeong, I.-K.; Lee, Seunghun; Jeong, Se-Young; Won, C. J.; Hur, N.; Llobet, A.

    2011-08-01T23:59:59.000Z

    Oxygen-deficient BaTiO3-? exhibits an insulator-metal transition with increasing ?. We performed neutron total scattering measurements to study structural evolution across an insulator-metal transition in BaTiO3-?. Despite its significant impact on resistivity, slight oxygen reduction (?=0.09) caused only a small disturbance on the local doublet splitting of Ti-O bond. This finding implies that local polarization is well preserved under marginal electric conduction. In the highly oxygen-deficient metallic state (?=0.25), however, doublet splitting of the Ti-O bond became smeared. The smearing of the local Ti-O doublet is complemented with long-range structural analysis and demonstrates that the metallic conduction in the highly oxygen-reduced BaTiO3-? is due to the appearance of nonferroelectric cubic lattice.

  10. (Y0.5In0.5)Ba(Co,Zn)4O7 cathodes with superior high-temperature phase stability for solid oxide fuel cells

    SciTech Connect (OSTI)

    Young Nam, Kim [University of Texas, Austin; Kim, Jung-Hyun [ORNL; Paranthaman, Mariappan Parans [ORNL; Manthiram, Arumugam [University of Texas, Austin; Huq, Ashfia [ORNL

    2012-01-01T23:59:59.000Z

    (Y0.5In0.5)BaCo4-xZnxO7 (1.0 x 2.0) oxides crystallizing in a trigonal P31c structure have been synthesized and explored as cathode materials for solid oxide fuel cells (SOFC). At a given Zn content, the (Y0.5In0.5)BaCo4-xZnxO7 sample with 50 % Y and 50 % In exhibits much improved phase stability at intermediate temperatures (600 - 800 oC) compared to the samples with 100 % Y or In. However, the substitution of Zn for Co in (Y0.5In0.5)Ba(Co4-xZnx)O7 (1.0 x 2.0) decreases the amount of oxygen loss on heating, total electrical conductivity, and cathode performance in SOFC while providing good long-term phase stability at high temperatures. Among the various chemical compositions investigated in the (Y0.5In0.5)Ba(Co4-xZnx)O7 system, the (Y0.5In0.5)BaCo3ZnO7 sample offers a combination of good electrochemical performance and low thermal expansion coefficient (TEC) while maintaining superior phase stability at 600 800 oC for 100 h. Fuel cell performances of the (Y0.5In0.5)Ba(Co3Zn)O7 + Ce0.8Gd0.2O1.9 (GDC) (50 : 50 wt. %) composite cathodes collected with anode-supported single cell reveal a maximum power density value of 521 mW cm-2 at 700 oC.

  11. X-ray and neutron powder diffraction studies of Ba(Nd{sub x}Y{sub 2-x})CuO{sub 5}

    SciTech Connect (OSTI)

    Liu, G. [Ceramics Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899 (United States); Huang, Q. [NIST Center for Neutron Research, Naperville, IL 60563 (United States); Kaduk, J.A. [INEOS Technologies, Naperville, IL 60563 (United States); Yang, Z. [Yunnan Normal University, Kunming 650092 (China); Lucas, C. [Chemistry and Biochemistry Department, University of Maryland, College Park, MD 20742 (United States); Wong-Ng, W. [Ceramics Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899 (United States)], E-mail: Winnie.wong-ng@nist.gov

    2008-12-15T23:59:59.000Z

    Ba(R,R'){sub 2}CuO{sub 5} (R,R'=lanthanides and Y) plays an important role as a flux-pinning agent in enhancing the superconducting properties of the Ba{sub 2}(R,R')Cu{sub 3}O{sub 6+x} (R,R'=lanthanides and Y) coated conductors. Using X-ray diffraction and neutron diffraction, we found that the Ba(Nd{sub x}Y{sub 2-x})CuO{sub 5} solid solution adopts two structure types. In the Nd-rich region (1.8{<=}x{<=}2.0), the materials are of brown color (commonly referred to as the 'brown phase'), and the structure is tetragonal with space group I4/mbm (no. 127). In the Y-rich region (0.0{<=}x{<=}1.4), the materials are green (commonly referred to as the 'green phase') and the structure is orthorhombic with space group Pnma (no. 62). A two-phase region (1.4Ba(Nd{sub x}Y{sub 2-x})CuO{sub 5} (isostructural to BaY{sub 2}CuO{sub 5}), are discussed in this paper. - Graphical abstract: Perspective view of the 'green phase' Ba(Nd{sub x}Y{sub 2-x})CuO{sub 5} structure along the b-axis, showing the isolated square pyramids of [CuO{sub 5}] and the trigonal prisms, RO{sub 7}, around the lanthanide sites.

  12. Metal-semiconductor-transition observed in Bi{sub 2}Ca(Sr, Ba){sub 2}Co{sub 2}O{sub 8+?} single crystals

    SciTech Connect (OSTI)

    Dong, Song-Tao [National Laboratory of Solid State Microstructures and Department of Material Science and Engineering, Nanjing University, Nanjing 210093 (China); Institute of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003 (China); Zhang, Bin-Bin; Zhang, Lun-Yong; Yao, Shu-Hua, E-mail: ybchen@nju.edu.cn, E-mail: shyao@nju.edu.cn; Zhou, Jian; Zhang, Shan-Tao; Gu, Zheng-Bin; Chen, Yan-Feng [National Laboratory of Solid State Microstructures and Department of Material Science and Engineering, Nanjing University, Nanjing 210093 (China); Chen, Y. B., E-mail: ybchen@nju.edu.cn, E-mail: shyao@nju.edu.cn [National Laboratory of Solid State Microstructures and Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)

    2014-07-28T23:59:59.000Z

    Electrical property evolution of Bi{sub 2}AE{sub 2}Co{sub 2}O{sub 8+?} single crystals (AE?=?Ca, Sr and Ba) is systematically explored. When AE changes from Ca to Ba, the electrical property of Bi{sub 2}Ca{sub 2}Co{sub 2}O{sub 8+?} and Bi{sub 2}Sr{sub 2}Co{sub 2}O{sub 8+?} demonstrates semiconductor-like properties. But Bi{sub 2}Ba{sub 2}Co{sub 2}O{sub 8+?} shows the metallic behavior. Analysis of temperature-dependent resistance substantiates that from metallic Bi{sub 2}Ba{sub 2}Co{sub 2}O{sub 8+?} to semiconductor-like Bi{sub 2}Sr{sub 2}Co{sub 2}O{sub 8+?} can be attributed to Anderson localization. However the semiconductor behaviour of Bi{sub 2}Sr{sub 2}Co{sub 2}O{sub 8+?} and Bi{sub 2}Ca{sub 2}Co{sub 2}O{sub 8+?} is related to electronic correlations effect that is inferred by large negative magnetoresistance (?70%). The theoretical electronic structures and valence X-ray photoemission spectroscopy substantiate that there is a relative large density of state around Fermi level in Bi{sub 2}Ba{sub 2}Co{sub 2}O{sub 8+?} compared with other two compounds. It suggests that Bi{sub 2}Ba{sub 2}Co{sub 2}O{sub 8+?} is more apt to be metal in this material system.

  13. Effect of annealing on the specific heat of Ba(Fe 1 ? x Co x ) 2 As 2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Gofryk, K.; Vorontsov, A. B.; Vekhter, I.; Sefat, A. S.; Imai, T.; Bauer, E. D.; Thompson, J. D.; Ronning, F.

    2011-02-01T23:59:59.000Z

    We report on the effect of annealing on the temperature and field dependencies of the low-temperature specific heat of the electron-doped Ba(Fe1-xCox)?As? for under- (x = 0.045), optimally (x = 0.08), and over- (x = 0.105 and 0.14) doped regimes. We observed that annealing significantly improves some superconducting characteristics in Ba(Fe1-xCox)?As?. It considerably increases Tc, decreases ?? in the superconducting state, and suppresses the Schottky-like contribution at very low temperatures. The improved sample quality allows for a better identification of the superconducting gap structure of these materials. We examine the effects of doping and annealing within a self-consistent framework for an extended s-wave pairing scenario. At optimal doping our data indicate that the sample is fully gapped, while for both under- and overdoped samples significant low-energy excitations remain, possibly consistent with a nodal structure. The difference of sample quality offers a natural explanation for the variation in low-temperature power laws observed by many techniques.

  14. Inclusion property of Cs, Sr, and Ba impurities in LiCl crystal formed by layer-melt crystallization

    SciTech Connect (OSTI)

    Choi, Jung-Hoon; Cho, Yung-Zun; Lee, Tae-Kyo; Eun, Hee-Chul; Kim, Jun-Hong; Park, Hwan-Seo; Kim, In-Tae; Park, Geun-Il [Nuclear Fuel Cycle Waste Treatment Research Division, Korea Atomic Energy Research Institute, Daejeon, 305-353 (Korea, Republic of)

    2013-07-01T23:59:59.000Z

    Pyroprocessing is one of the promising technologies enabling the recycling of spent nuclear fuels from a commercial light water reactor (LWR). In general, pyroprocessing uses dry molten salts as electrolytes. In particular, LiCl waste salt after pyroprocessing contains highly radioactive I/II group fission products mainly composed of Cs, Sr, and Ba impurities. Therefore, it is beneficial to reuse LiCl salt in the pyroprocessing as an electrolyte for economic and environmental issues. Herein, to understand the inclusion property of impurities within LiCl crystal, the physical properties such as lattice parameter change, bulk modulus, and substitution enthalpy of a LiCl crystal having 0-6 at% Cs{sup +} or Ba{sup 2+} impurities under existence of 1 at% Sr{sup 2+} impurity were calculated via the first-principles density functional theory. The substitution enthalpy of LiCl crystals having 1 at% Sr{sup 2+} showed slightly decreased value than those without Sr{sup 2+} impurity. Therefore, through the substitution enthalpy calculation, it is expected that impurities will be incorporated within LiCl crystal as co-existed form rather than as a single component form. (authors)

  15. BaZn{sub 2}Si{sub 2}O{sub 7} and the solid solution series BaZn{sub 2?x}Co{sub x}Si{sub 2}O{sub 7} (0

    SciTech Connect (OSTI)

    Kerstan, Marita; Thieme, Christian; Grosch, Matthias; Müller, Matthias; Rüssel, Christian, E-mail: ccr@rz.uni-jena.de

    2013-11-15T23:59:59.000Z

    For sealing of solid oxide fuel cells, glasses from which crystalline phases with high coefficient of thermal expansion (CTE) can be crystallized are required. In this paper, a new solid solution series BaZn{sub 2?x}Co{sub x}Si{sub 2}O{sub 7} (0BaZn{sub 2}Si{sub 2}O{sub 7}). Sintered specimens were characterized by dilatometry. The introduction of Co{sup 2+} does not lead to a change in the space group. All compounds show a transition of a low to a high temperature modification. The attributed temperature increases from 300 °C for BaZn{sub 2}Si{sub 2}O{sub 7} to 850 °C for BaCo{sub 2}Si{sub 2}O{sub 7}. The volume expansion which runs parallel to the phase transition decreases with increasing cobalt concentration. The phase BaZn{sub 2}Si{sub 2}O{sub 7} shows the largest CTE and a steep volume effect during phase transition. For the compound BaZn{sub 0.25}Co{sub 1.75}Si{sub 2}O{sub 7} the CTE is minimum (8.6×10{sup ?6} K{sup ?1} (50–900 °C)) and increases again until for the compound BaCo{sub 2}Si{sub 2}O{sub 7} a CTE of 16.6×10{sup ?6} K{sup ?1} (50–900 °C) is reached. In the cobalt rich composition range, the CTEs are in the right range for high temperature fuel cells and can be adjusted by the composition. - Graphical abstract: The composition of the solid solution BaZn{sub 2?x}Co{sub x}Si{sub 2}O{sub 7} strongly affects the thermal expansion. Display Omitted - Highlights: • We examined the thermal expansion of solid solutions BaZn{sub 2?x}Co{sub x}Si{sub 2}O{sub 7} (0BaZn{sub 2}Si{sub 2}O{sub 7} exhibits the highest thermal expansion due to a phase transition. • Substitution of small amounts of Zn{sup 2+} against Co{sup 2+} lead to decreasing thermal expansion. • The thermal expansions re-increased with further increasing Co{sup 2+} concentrations. • Seals based on these solid solutions should be suitable for solid oxide fuel cells.

  16. Electronic structure and transport properties of Ba{sub 6}Cu{sub 12}Fe{sub 13}S{sub 27}

    SciTech Connect (OSTI)

    Llanos, J.; Mujica, C. [Univ. Catolica del Norte, Casilla (Chile). Dept. de Quimica] [Univ. Catolica del Norte, Casilla (Chile). Dept. de Quimica

    1997-09-01T23:59:59.000Z

    The electrical properties and bonding in Ba{sub 6}Cu{sub 12}Fe{sub 13}S{sub 27} are analyzed with the extended Hueckel tight-binding method. Because the Fermi level crosses several bands, metallic properties could be expected for this material. The electrical conductivity measurements as well as diffuse reflectance spectrum show that Ba{sub 6}Cu{sub 12}S{sub 13}S{sub 27} is a semiconductor with a band gap of 2.49 eV. The discrepancy between the theoretical and experimental electrical properties is attributed to a random distribution of the Cu and Fe atoms in the structure.

  17. Exploration of R2XM2 (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge): Structural Motifs, the novel Compound Gd2AlGe2 and Analysis of the U3Si2 and Zr3Al2 Structure Types

    SciTech Connect (OSTI)

    Sean William McWhorter

    2006-05-01T23:59:59.000Z

    In the process of exploring and understanding the influence of crystal structure on the system of compounds with the composition Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} several new compounds were synthesized with different crystal structures, but similar structural features. In Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, the main feature of interest is the magnetocaloric effect (MCE), which allows the material to be useful in magnetic refrigeration applications. The MCE is based on the magnetic interactions of the Gd atoms in the crystal structure, which varies with x (the amount of Si in the compound). The crystal structure of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} can be thought of as being formed from two 3{sup 2}434 nets of Gd atoms, with additional Gd atoms in the cubic voids and Si/Ge atoms in the trigonal prismatic voids. Attempts were made to substitute nonmagnetic atoms for magnetic Gd using In, Mg and Al. Gd{sub 2}MgGe{sub 2} and Gd{sub 2}InGe{sub 2} both possess the same 3{sup 2}434 nets of Gd atoms as Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, but these nets are connected differently, forming the Mo{sub 2}FeB{sub 2} crystal structure. A search of the literature revealed that compounds with the composition R{sub 2}XM{sub 2} (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge) crystallize in one of four crystal structures: the Mo{sub 2}FeB{sub 2}, Zr{sub 3}Al{sub 2}, Mn{sub 2}AlB{sub 2} and W{sub 2}CoB{sub 2} crystal structures. These crystal structures are described, and the relationships between them are highlighted. Gd{sub 2}AlGe{sub 2} forms an entirely new crystal structure, and the details of its synthesis and characterization are given. Electronic structure calculations are performed to understand the nature of bonding in this compound and how electrons can be accounted for. A series of electronic structure calculations were performed on models with the U{sub 3}Si{sub 2} and Zr{sub 3}Al{sub 2} structures, using Zr and A1 as the building blocks. The starting point for these models was the U{sub 3}Si{sub 2} structure, and models were created to simulate the transition from the idealized U{sub 3}Si{sub 2} structure to the distorted Zr{sub 3}Al{sub 2} structure. Analysis of the band structures of the models has shown that the transition from the U{sub 3}Si{sub 2} structure to the Zr{sub 3}Al{sub 2} structure lifts degeneracies along the {Lambda} {yields} Z direction, indicating a Peierls-type mechanism for the displacement occurring in the positions of the Zr atoms.

  18. In situ X-ray diffraction strain-controlled study of Ti–Nb–Zr and Ti–Nb–Ta shape memory alloys: crystal lattice and transformation features

    SciTech Connect (OSTI)

    Dubinskiy, S. [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation); Prokoshkin, S. [National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation); Brailovski, V., E-mail: vladimir.brailovski@etsmtl.ca [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); Inaekyan, K. [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); Korotitskiy, A. [National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation)

    2014-02-15T23:59:59.000Z

    Phase and structure transformations in biomedical Ti–21.8Nb–6.0Zr (TNZ) and Ti–19.7Nb–5.8Ta (TNT) shape memory alloys (at.%) under and without load in the ? 150 to 100 °S temperature range are studied in situ using an original tensile module for a low-temperature chamber of an X-ray diffractometer. Alpha?- and beta-phase lattice parameters, the crystallographic resource of recovery strain, phase and structure transformation sequences, and microstress appearance and disappearance are examined, compared and discussed. For both alloys, the crystallographic resource of recovery strain decreases with temperature increase to become 4.5% for TNZ and 2.5% for TNT alloy (at RT). Loading at low temperatures leads to additional ??-phase formation and reorientation. Heating under load, as compared to strain-free heating, affects the reverse transformation sequence of both alloys in different ways. For TNZ alloy, strain-free heating results in simultaneous ??? and ???? transformations, whereas during heating under stress, they are sequential: ? + ???? precedes ????. For TNT alloy, strain-free heating results in reverse ???? transformation, whereas during heating under stress, ???? transformation is preceded by ??-phase reorientation. - Highlights: • Comparative in situ XRD analysis of Ti–Nb–Zr(Ta) shape memory alloys is realized. • Lattice parameters of ?- and ??-phases are calculated in the ? 150 to + 100 °C range. • The higher the temperature, the lower the ???? transformation strain. • Loading at low temperatures results in ??-phase formation and reorientation. • Transformation sequences upon heating with and without loading are different.

  19. The effect of fluence and irradiation temperature on delayed hydride cracking in Zr-2.5Nb

    SciTech Connect (OSTI)

    Sagat, S.; Coleman, C.E.; Griffiths, M. [AECL Research, Chalk River, Ontario (Canada); Wilkins, B.J.S. [AECL Research, Pinawa, Manitoba (Canada)

    1994-12-31T23:59:59.000Z

    Zirconium alloys are susceptible to a stable cracking process called delayed hydride cracking (DHC). DHC has two stages: (a) crack initiation that requires a minimum crack driving force (the threshold stress intensity factor, K{sub IH}) and (b) stable crack growth that is weakly dependent on K{sub l}. The value of K{sub lH} is an important element in determining the tolerance of components to sharp flaws. The rate of cracking is used in estimating the action time for detecting propagating cracks before they become unstable. Hence, it is important for reactor operators to know how these properties change during service in reactors where the components are exposed to neutron irradiation at elevated temperatures. DHC properties were measured on a number of components, made from the two-phase alloy Zr-2.5 Nb, irradiated at temperatures in the range of 250 to 290 C in fast neutron fluxes (E {>=} 1 MeV) between 1.6 {times} 10{sup 17} and 1.8 {times} 10{sup 18} n/m{sup 2} {center_dot} s to fluences between 0.01 {times} 10{sup 25} and 9.8 {times} 10{sup 25} n/m{sup 2}. The neutron irradiation reduced K{sub IH} by about 20% and increased the velocity of cracking by a factor of about five. The increase in crack velocity was greatest with the lowest irradiation temperature. These changes in the rack velocity by neutron irradiation are explained in terms of the combined effects of irradiation hardening associated with increased -type dislocation density, and {beta}-phase decomposition. While the former process increases crack velocity, the latter process decrease it. The combined contribution is controlled by the irradiation temperature. X-ray diffraction analyses showed that the degree of {beta}-phase decomposition was highest with an irradiation temperature of 290 C while -type dislocation densities were highest with an irradiation temperature of 250 C.

  20. JOURNAL DE PHYSIQUE CoZZoque C8, suppZ6ment au n08, Tome 41, aoiit 1980, page C8-745 LOW TEMPERATURE THERMAL PROPERTIES OF AMORPHOUS SUPERCONDUCTING ZrCu

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    TEMPERATURE THERMAL PROPERTIES OF AMORPHOUS SUPERCONDUCTING ZrCu H.v. ~Ehneysen,M. Platte, W. Sander, H- applications - from two major points: (1) the investigation of superconductinq properties yields information the superconductinp transition temperatufe Tc, the condensation of electronic quasiparticles permits access

  1. Density functional theory study on the interstitial chemical shifts of main-group-element centered hexazirconium halide clusters; synthetic control of speciation in [(Zr6ZCl12)] (Z = B, C)-based mixed ligand complexes

    E-Print Network [OSTI]

    Shen, Jingyi

    2005-08-29T23:59:59.000Z

    substitution of terminal chlorides on [(Zr6CCl12)Cl6]4-cluster by tri(n-butyl)-phosphine oxide (Bu3PO) was conducted with the aid of TlPF6. Composition of the reaction mixtures was analyzed by use of both 13C and 31P NMR. A preliminary scheme for synthesis...

  2. In situ growth of ZrO{sub 2}–Al{sub 2}O{sub 3} nano-crystalline ceramic coatings via micro arc oxidation of aluminum substrates

    SciTech Connect (OSTI)

    Shoaei-Rad, V. [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of)] [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of); Bayati, M.R., E-mail: mbayati@ncsu.edu [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of); Department of Materials Science and Engineering, North Carolina State University, Raleigh 27695-7907, NC (United States); Zargar, H.R. [Department of Metals and Materials Engineering, University of British Columbia, Vancouver, BC V6T 1Z4 (Canada)] [Department of Metals and Materials Engineering, University of British Columbia, Vancouver, BC V6T 1Z4 (Canada); Javadpour, J. [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of)] [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of); Golestani-Fard, F. [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of) [School of Metallurgy and Materials Engineering, Iran University of Science and Technology, P.O. Box 16845-161, Tehran (Iran, Islamic Republic of); Center of Excellence for Advanced Materials, Iran University of Science and Technology, P.O. Box 16845-195, Tehran (Iran, Islamic Republic of)

    2012-06-15T23:59:59.000Z

    Highlights: ? ZrO{sub 2}–Al{sub 2}O{sub 3} layers were fabricated by MAO process. ? A formation mechanism was also proposed. ? Effect of voltage and electrolyte composition on layers properties was studied. -- Abstract: Micro arc oxidation technique was employed to grow zirconia–alumina porous layers. Considering XPS, XRD, and EDX results, the layers mainly consisted of ?-Al{sub 2}O{sub 3}, ?-Al{sub 2}O{sub 3}, monoclinic ZrO{sub 2}, tetragonal ZrO{sub 2}. Fractions of these phases were observed to change based on the fabrication conditions. Zirconia phases formed not only on the surface, but also in the layers depth. Increasing the voltage as well as utilizing thicker electrolytes resulted in higher zirconium concentration. The average crystalline size of the ZrO{sub 2} and the Al{sub 2}O{sub 3} phases was determined as about 57 and 75 nm. AFM studies revealed that the surface roughness increased with voltage and electrolyte concentration. Morphological evaluations, performed by SEM, showed that the microstructure of the layers strongly depended on the synthesis conditions. The layers revealed a porous structure with a pores size of 40–300 nm. Microcracks were observed to appear when the electrolyte concentration and the applied voltage increased. Finally, a formation mechanism was put forward with emphasis on the chemical and the electrochemical foundations.

  3. Poisoning Incidence in Wisconsin: Does Age Ma2er? Thomas Leschke, BA; Clare Guse, MS; Amy Schlo2hauer, MPH; Peter Layde, MD, MSc IntroducEon

    E-Print Network [OSTI]

    Poisoning Incidence in Wisconsin: Does Age Ma2er? Thomas Leschke, BA; Clare groups for both intenEonal opioid and non-opioid poisonings Opioid range: 6 and ICD -10 codes were used to divide poisoning incidents by agent (opioid vs

  4. First Principles Calculations of Oxygen Vacancy Formation and Migration in Ba1?xSrxCo1?yFeyO3?? Perovskites

    SciTech Connect (OSTI)

    Merkle, Rotraut; Mastrikov, Yuri; Kotomin, Eugene Alexej; Kukla, Maija M.; Maier, Joachim

    2011-12-28T23:59:59.000Z

    Based on first principles DFT calculations, we analyze oxygen vacancy formation and migration energies as a function of chemical composition in complex multicomponent (Ba,Sr)(Co,Fe)O3?? perovskites which are candidate materials for SOFC cathodes and permeation membranes. The atomic relaxation, electronic charge redistribution and energies of the transition states of oxygen migration are compared for several perovskites to elucidate the atomistic reason for the exceptionally low migration barrier in Ba0.5Sr0.5Co0.8Fe0.2O3?? that was previously determined experimentally. The critical comparison of Ba1?xSrxCo1?yFeyO3?? perovskites with different cation compositions and arrangements shows that in addition to the geometric constraints the electronic structure plays a considerable role for the height of the oxygen migration barrier in these materials. These findings help understand advantages and limitations of the fast oxygen permeation and exchange properties of Ba0.5Sr0.5Co0.8Fe0.2O3??.

  5. Single Phase Melt Processed Powellite (Ba,Ca) MoO{sub 4} For The Immobilization Of Mo-Rich Nuclear Waste

    SciTech Connect (OSTI)

    Brinkman, Kyle [Savannah River Site (SRS), Aiken, SC (United States); Marra, James [Savannah River Site (SRS), Aiken, SC (United States); Fox, Kevin [Savannah River Site (SRS), Aiken, SC (United States); Reppert, Jason [Savannah River Site (SRS), Aiken, SC (United States); Crum, Jarrod [Paci fic Northwest National Laboratory , Richland, WA (United States); Tang, Ming [Los Alamos National Laboratory , Los Alamos, NM (United States)

    2012-09-17T23:59:59.000Z

    Crystalline and glass composite materials are currently being investigated for the immobilization of combined High Level Waste (HLW) streams resulting from potential commercial fuel reprocessing scenarios. Several of these potential waste streams contain elevated levels of transition metal elements such as molybdenum (Mo). Molybdenum has limited solubility in typical silicate glasses used for nuclear waste immobilization. Under certain chemical and controlled cooling conditions, a powellite (Ba,Ca)MoO{sub 4} crystalline structure can be formed by reaction with alkaline earth elements. In this study, single phase BaMoO{sub 4} and CaMoO{sub 4} were formed from carbonate and oxide precursors demonstrating the viability of Mo incorporation into glass, crystalline or glass composite materials by a melt and crystallization process. X-ray diffraction, photoluminescence, and Raman spectroscopy indicated a long range ordered crystalline structure. In-situ electron irradiation studies indicated that both CaMoO{sub 4} and BaMoO{sub 4} powellite phases exhibit radiation stability up to 1000 years at anticipated doses with a crystalline to amorphous transition observed after 1 X 10{sup 13} Gy. Aqueous durability determined from product consistency tests (PCT) showed low normalized release rates for Ba, Ca, and Mo (<0.05 g/m{sup 2}).

  6. Essential Studies Worksheet B.A. with major in Computer Science I. Communication 9 Credits (6 credits writing and 3 credits Oral Communication)

    E-Print Network [OSTI]

    Delene, David J.

    Essential Studies Worksheet ­ B.A. with major in Computer Science I. Communication 9 Credits (6 credits writing and 3 credits Oral Communication) Special Emphasis Area: Course: Credits: Semester Special Emphasis Area requirements that may fall outside of Communication, Social Sciences, Arts

  7. Greenhouse Heating Checklist1 R. A. Bucklin, P. H. Jones, B.A. Barmby, D. B. McConnell, and R. W. Henley2

    E-Print Network [OSTI]

    Watson, Craig A.

    CIR791 Greenhouse Heating Checklist1 R. A. Bucklin, P. H. Jones, B.A. Barmby, D. B. Mc heating is the union of an appropriate heat source and an efficient heat distribu- tion system. The best greenhouse heat source in the world is useless if the heat cannot be transferred to the plant environment

  8. Barium Titanate and Bismuth Oxide Nanocomposites Barium titanate, BaTiO3, and bismuth oxide Bi2O3 are transparent materials with

    E-Print Network [OSTI]

    Harmon, Julie P.

    Barium Titanate and Bismuth Oxide Nanocomposites Barium titanate, BaTiO3, and bismuth oxide Bi2O3 that are lead-free. If we cannot shield effectively at nanofiller levels where transparency is maintained, we, Condensed Matter, Vol. 15, 8927 (2003). 21. "Highly Nonlinear Bismuth-Oxide Fiber for Smooth Supercontinuun

  9. Data:68ce477e-490b-4d2b-a92e-a7309a5ce45b | Open Energy Information

    Open Energy Info (EERE)

    >> Category:Categories Retrieved from "http:en.openei.orgwindex.php?titleData:68ce477e-490b-4d2b-a92e-a7309a5ce45b&oldid756745" Category: Utility Rates What links...

  10. The School offers the Bachelor of Science (B.S.) and Bachelor of Arts (B.A) degrees in computer science.

    E-Print Network [OSTI]

    Thomas, Andrew

    The School offers the Bachelor of Science (B.S.) and Bachelor of Arts (B.A) degrees in computer science. Computer science is the foundation of computing and information technology. Computer scientists and services. The required course work in computer science provides the student with an understanding

  11. Effect of strain on tunability in Ba0.60Sr0.40TiO3 thin films on PtSi substrates

    E-Print Network [OSTI]

    Alpay, S. Pamir

    Effect of strain on tunability in Ba0.60Sr0.40TiO3 thin films on Pt­Si substrates D. M. Potrepkaa, M. W. Cole, and W. D. Nothwang Weapons & Materials Research Directorate, Active Materials Research discussed the effects that postannealing in oxygen can have to overcome limits on oxygen diffusion

  12. 54 Club Business International | APrIL 2013 | ihrsa.org Download the Free IHrSA App: ihrsa.org/app CBI goes BaCK to

    E-Print Network [OSTI]

    Ginzel, Matthew

    .org/app CBI goes BaCK to sCHooL to Find oUt wHat's new C lub operators understand the value and importance asymmetries in the body. At Springfield, students complete a class in basic exercise testing and prescrip

  13. CDMA Uplink Power Control as a Noncooperative Game 1 Tansu Alpcan 2 , Tamer Ba sar 2 , R. Srikant 2 , and Eitan Altman 3

    E-Print Network [OSTI]

    Srikant, Rayadurgam

    , Univeridad de Los Andes, Merida, Venezuela. 1 #12; Power control in CDMA systems are in either open control algorithm converges under a wide variety of interference models. Another distributed power controlCDMA Uplink Power Control as a Noncooperative Game 1 Tansu Alpcan 2 , Tamer Ba#24;sar 2 , R

  14. Oxygen-related dielectric relaxation and leakage characteristics of Pt,,Ba,Sr...TiO3 Pt thin-film capacitors

    E-Print Network [OSTI]

    Cao, Wenwu

    Oxygen-related dielectric relaxation and leakage characteristics of PtÕ,,Ba,Sr...TiO3 ÕPt thin to the postannealing temperature in oxygen and nitrogen atmosphere. High leakage currents and low-frequency dielectric and subsequently annealed in oxygen at 350 °C. Such results are related to the mobile oxygen ions and oxygen

  15. Data:Bce2f4c5-a03a-4631-8a13-bf8a9d9ba7ab | Open Energy Information

    Open Energy Info (EERE)

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  16. Accuracy Test for Link Prediction in terms of Similarity Index: The Case of WS and BA Models

    E-Print Network [OSTI]

    Ahn, Min-Woo

    2015-01-01T23:59:59.000Z

    Link prediction is a technique that uses the topological information in a given network to infer the missing links in it. Since past research on link prediction has primarily focused on enhancing performance for given empirical systems, negligible attention has been devoted to link prediction with regard to network models. In this paper, we thus apply link prediction to two network models: The Watts-Strogatz (WS) model and Barab\\'asi-Albert (BA) model. We attempt to gain a better understanding of the relation between accuracy and each network parameter (mean degree, the number of nodes and the rewiring probability in the WS model) through network models. Six similarity indices are used, with precision and area under the ROC curve (AUC) value as the accuracy metrics. We observe a positive correlation between mean degree and accuracy, and size independence of the AUC value.

  17. Signatures of quantum criticality in the thermopower of Ba(Fe1?xCox)2As2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Arsenijevi?, S.; Hodovanets, H.; Gaál, R.; Forró, L.; Bud'ko, S. L.; Canfield, P. C.

    2013-06-01T23:59:59.000Z

    We demonstrate that the thermopower (S) can be used to probe the spin fluctuations (SFs) in proximity to the quantum critical point (QCP) in Fe-based superconductors. The sensitivity of S to the entropy of charge carriers allows us to observe an increase of S/T in Ba(Fe1?xCox)2As2 close to the spin-density-wave (SDW) QCP. This behavior is due to the coupling of low-energy conduction electrons to two-dimensional SFs, similar to heavy-fermion systems. The low-temperature enhancement of S/T in the Co substitution range 0.02c?0.05, close to the highest superconducting Tc. This analysis indicates that low-T thermopower is influenced by critical spin fluctuations which are important for the superconducting mechanism.

  18. Heterojunction band offsets and dipole formation at BaTiO{sub 3}/SrTiO{sub 3} interfaces

    SciTech Connect (OSTI)

    Balaz, Snjezana [Department of Physics and Astronomy, Youngstown State University, One University Plaza, Youngstown, Ohio 44555 (United States)] [Department of Physics and Astronomy, Youngstown State University, One University Plaza, Youngstown, Ohio 44555 (United States); Zeng, Zhaoquan [Department of Electrical and Computer Engineering, The Ohio State University, 205 Dreese Lab, 2015 Neil Ave., Columbus, Ohio 43210 (United States)] [Department of Electrical and Computer Engineering, The Ohio State University, 205 Dreese Lab, 2015 Neil Ave., Columbus, Ohio 43210 (United States); Brillson, Leonard J. [Department of Electrical and Computer Engineering, The Ohio State University, 205 Dreese Lab, 2015 Neil Ave., Columbus, Ohio 43210 (United States) [Department of Electrical and Computer Engineering, The Ohio State University, 205 Dreese Lab, 2015 Neil Ave., Columbus, Ohio 43210 (United States); Department of Physics, The Ohio State University, 191 West Woodruff, Columbus, Ohio 43210 (United States)

    2013-11-14T23:59:59.000Z

    We used a complement of photoemission and cathodoluminescence techniques to measure formation of the BaTiO{sub 3} (BTO) on SrTiO{sub 3} (STO) heterojunction band offset grown monolayer by monolayer by molecular beam epitaxy. X-ray photoemission spectroscopy (XPS) provided core level and valence band edge energies to monitor the valence band offset in-situ as the first few crystalline BTO monolayers formed on the STO substrate. Ultraviolet photoemission spectroscopy (UPS) measured Fermi level positions within the band gap, work functions, and ionization potentials of the growing BTO film. Depth-resolved cathodoluminescence spectroscopy measured energies and densities of interface states at the buried heterojunction. Kraut-based XPS heterojunction band offsets provided evidence for STO/BTO heterojunction linearity, i.e., commutativity and transitivity. In contrast, UPS and XPS revealed a large dipole associated either with local charge transfer or strain-induced polarization within the BTO epilayer.

  19. Physical properties and electronic structure of a new barium titanate suboxide Ba1+?Ti13-?O?? (? = 0.11)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Rotundu, Costel R.; Jiang, Shan; Deng, Xiaoyu; Qian, Yiting; Khan, Saeed; Hawthorn, David G.; Kotliar, Gabriel; Ni, Ni

    2015-04-01T23:59:59.000Z

    The structure, transport, thermodynamic properties, x-ray absorption spectra (XAS), and electronic structure of a new barium titanate suboxide, Ba1+?Ti13-?O?? (? = 0.11), are reported. It is a paramagnetic poor metal with hole carriers dominating the transport. Fermi liquid behavior appears at low temperature. The oxidization state of Ti obtained by the XAS is consistent with the metallic Ti²? state. Local density approximation band structure calculations reveal the material is near the Van Hove singularity. The pseudogap behavior in the Ti-d band and the strong hybridization between the Ti-d and O-p orbitals reflect the characteristics of the building blocks of themore »Ti?? semi-cluster and the TiO? quasi-squares, respectively.« less

  20. Physical properties and electronic structure of a new barium titanate suboxide Ba1+?Ti13-?O?? (? = 0.11)

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Rotundu, Costel R. [Univ. of California Los Angeles, Los Angeles, CA (United States); Jiang, Shan [Univ. of California Los Angeles, Los Angeles, CA (United States); Deng, Xiaoyu [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000178020966); Qian, Yiting [Univ. of Waterloo, Waterloo (Canada)] (ORCID:0000000250175517); Khan, Saeed [Univ. of California Los Angeles, Los Angeles, CA (United States); Hawthorn, David G. [Univ. of Waterloo, Waterloo (Canada)] (ORCID:0000000270020416); Kotliar, Gabriel [Rutgers Univ., Piscataway, NJ (United States); Ni, Ni [Univ. of California Los Angeles, Los Angeles, CA (United States)

    2015-04-01T23:59:59.000Z

    The structure, transport, thermodynamic properties, x-ray absorption spectra (XAS), and electronic structure of a new barium titanate suboxide, Ba1+?Ti13-?O?? (? = 0.11), are reported. It is a paramagnetic poor metal with hole carriers dominating the transport. Fermi liquid behavior appears at low temperature. The oxidization state of Ti obtained by the XAS is consistent with the metallic Ti²? state. Local density approximation band structure calculations reveal the material is near the Van Hove singularity. The pseudogap behavior in the Ti-d band and the strong hybridization between the Ti-d and O-p orbitals reflect the characteristics of the building blocks of the Ti?? semi-cluster and the TiO? quasi-squares, respectively.