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Sample records for ba ra zr

  1. Structural Evolving Sequence and Porous Ba6Zr2Nb8O30 Ferroelectric Ceramics with Ultrahigh Breakdown Field and Zero Strain

    E-Print Network [OSTI]

    Cao, Wenwu

    Structural Evolving Sequence and Porous Ba6Zr2Nb8O30 Ferroelectric Ceramics with Ultrahigh of relaxor ferroelectric Ba6Zr2Nb8O30 (BZN) ceramics has been investigated and dis- cussed. Porous BZN, which refinements determine the atomic positions and confirm that the porous ceramics has tetragonal tungsten bronze

  2. 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 in the BYZ electrolyte. Indeed, the calculated values bracket the experimental value of Ea=0.44 eV. Based been proposed for the BYZ electrolyte. The thermal librations of BO6 octahedra and uncorrelated thermal

  3. 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.

    2009-11-20

    density, Jc. Vortex pinning by the insertion of non-superconducting oxides like BaZrO3 (BZO) or BaSnO3 (BSO) into the YBCO matrix is an effective means of addressing this problem since these defects self-assemble into columnar structures (nanorods...

  4. Broad Temperature Pinning Study of 15 mol.% Zr-Added (Gd, Y)-Ba-Cu-O MOCVD Coated Conductors

    SciTech Connect (OSTI)

    Xu, AX; Khatri, N; Liu, YH; Majkic, G; Galstyan, E; Selvamanickam, V; Chen, YM; Lei, CH; Abraimov, D; Hu, XB; Jaroszynski, J; Larbalestier, D

    2015-06-01

    BaZrO3 (BZO) nanocolumns have long been shown to be very effective for raising the pinning force F-p of REBa2Cu3Ox (REBCO, where RE = rare earth) films at high temperatures and recently at low temperatures too. We have successfully incorporated a high density of BZO nanorods into metal organic chemical vapor deposited (MOCVD) REBCO coated conductors via Zr addition. We found that, compared to the 7.5% Zr-added coated conductor, dense BZO nanorod arrays in the 15% Zr-added conductor are effective over the whole temperature range from 77 K down to 4.2 K. We attribute the substantially enhanced J(c) at 30 K to the weak uncorrelated pinning as well as the strong correlated pinning. Meanwhile, by tripling the REBCO layer thickness to similar to 2.8 mu m, the engineering critical current density J(e) at 30 K exceeds J(e) of optimized Nb-Ti wires at 4.2 K.

  5. 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.; De la Rosa, E.; Salas, P.; Velazquez-Salazar, J.J.

    2012-12-15

    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.

  6. The structural and in-plane dielectric/ferroelectric properties of the epitaxial (Ba, Sr)(Zr, Ti)O{sub 3} thin films

    SciTech Connect (OSTI)

    Chan, N. Y., E-mail: ngaiyuichan@gmail.com; Wang, Y.; Chan, H. L. W. [Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong (China); Wang, D. Y. [School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052 (Australia); Dai, J. Y. [Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong (China); Shenzhen Research Institute, The Hong Kong Polytechnic University (China)

    2014-06-21

    Epitaxial (Ba{sub 1-x}Sr{sub x})(Zr{sub 0.1}Ti{sub 0.9})O{sub 3} (BSZT, x?=?0 – 0.45) thin films were deposited on (LaAlO{sub 3}){sub 0.3}(Sr{sub 2}AlTaO{sub 6}){sub 0.35} (LSAT) substrates by pulsed laser deposition. The experimental results demonstrate that the structural, dielectric, and ferroelectric properties of the BSZT thin films were greatly dependent on the strontium content. The BSZT thin films transformed from tetragonal to cubic phase when x???0.35 at room temperature. The Curie temperature and room-temperature remnant polarization decrease with increasing strontium concentration. The optimal dielectric properties were found in (Ba{sub 0.55}Sr{sub 0.45})(Zr{sub 0.1}Ti{sub 0.9})O{sub 3} thin films which is in paraelectric state, having tunability of 47% and loss tangent of 0.0338 under an electric field of 20 MV/m at 1?MHz. This suggests that BSZT thin film is a promising candidate for tunable microwave device applications.

  7. Temperature driven nano-domain evolution in lead-free Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-50(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoceramics

    SciTech Connect (OSTI)

    Lu, Shengbo Xu, Zhengkui; Su, Shi; Zuo, Ruzhong

    2014-07-21

    Hierarchical micro- and nanoscale domain structures in Pb-free Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-50(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoceramics were investigated by transmission electron microscopy. In situ heating and cooling studies of domain structure evolution reveal an irreversible domain transformation from a wedge-shaped rhombohedral nanodomain structure to a lamellar tetragonal domain structure, which could be associated with strong piezoelectricity in Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3}-50(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3} piezoceramics.

  8. Dielectric behavior of samarium-doped BaZr{sub 0.2}Ti{sub 0.8}O{sub 3} ceramics

    SciTech Connect (OSTI)

    Li, Yuanliang; Wang, Ranran; Ma, Xuegang; Li, Zhongqiu; Sang, Rongli; Qu, Yuanfang

    2014-01-01

    Graphical abstract: - Highlights: • We investigate dielectric properties and phase transition of Sm{sup 3+}-doped BaZr{sub 0.2}Ti{sub 0.8}O{sub 3} ceramics. • The additive amount of Sm{sub 2}O{sub 3} can greatly affect the dielectric properties. • The materials undergo a diffuse type ferroelectric phase transition. • There is an alternation of substitution preference of Sm{sup 3+} ion for the host cations in perovskite lattice. - Abstract: The dielectric properties and phase transition of Sm{sup 3+}-doped BaZr{sub 0.2}Ti{sub 0.8}O{sub 3} (BZT20) ceramics were investigated. Room temperature X-ray diffraction study suggested that the compositions had single-phase cubic symmetry. Microstructure studies showed that the grain size decreased and that the Sm{sub 2}O{sub 3} amount markedly affected the dielectric properties of BZT20. A dielectric constant of 5700 at 0.2 mol% Sm{sub 2}O{sub 3} and a dissipation factor of only 0.0011 at 2 mol% Sm{sub 2}O{sub 3} were observed, indicating that BZT20 had significant potential applications. Moreover, the dielectric constant, dissipation factor, phase-transition temperature, and maximum dielectric constant increased with increased Sm{sub 2}O{sub 3} amount at ?0.2 mol% Sm{sub 2}O{sub 3} but decreased with increased Sm{sub 2}O{sub 3} amount at >0.2 mol% Sm{sub 2}O{sub 3}.

  9. 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)

    2011-05-15

    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.

  10. 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)

    2010-12-01

    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.

  11. Analysis of beta-decay rates for Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90, measured at the Physikalisch-Technische Bundesanstalt from 1990 to 1996

    SciTech Connect (OSTI)

    Sturrock, P. A. [Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305 (United States); Fischbach, E. [Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 (United States); Jenkins, J. [Department of Nuclear Engineering, Texas A and M University, College Station, TX 77843 (United States)

    2014-10-10

    We present the results of an analysis of measurements of the beta-decay rates of Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90 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 count rate measurements exhibit a sinusoidal annual variation with amplitude in the small range 0.068%-0.088% (mean 0.081%, standard deviation 0.0072%, a rejection of the zero-amplitude hypothesis) and phase-of-maximum in the small range 0.062-0.083 (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? detector. These results are compatible with a solar influence, and do not appear to be compatible with an experimental or environmental influence. It is possible that Ba 133 measurements are also subject to a non-solar (possibly cosmic) influence.

  12. Anisotropy of the Irreversibility Field for Zr-doped (Y,Gd)Ba2<\\sub>Cu3<\\sub>O<7-x<\\sub> Thin Films up to 45 T

    SciTech Connect (OSTI)

    Tarantini, C. [Florida State University; Jaroszynski, J. [Florida State University; Kametani, F. [Florida State University; Zuev, Yuri L [ORNL; Gurevich, A. [Florida State University; Chen, Y [SuperPower Incorporated, Schenectady, New York; Selvamanickam, V. [SuperPower Incorporated, Schenectady, New York; Larbalestier, D. C. [Florida State University; Christen, David K [ORNL

    2011-01-01

    The anisotropic irreversibility fieldBIrr of twoYBa2Cu3O7 x thin films dopedwith additional rare earth (RE)= (Gd, Y) and Zr and containing strong correlated pins (splayed BaZrO3 nanorods and RE2O3 anoprecipitates) has been measured over a very broad range up to 45 T at temperatures 56 K < T < Tc. We found that the experimental angular dependence of BIrr ( ) does not follow the mass anisotropy scaling BIrr ( ) = BIrr (0)(cos2 + 2 sin2 ) 1/2, where = (mc/mab)1/2 = 5 6 for the RE-doped Ba2Cu3O7 x (REBCO) crystals, mab and mc are the effective masses along the ab plane and the c-axis, respectively, and is the angle between B and the c-axis. For B parallel to the ab planes and to the c-axis correlated pinning strongly enhances BIrr , while at intermediate angles, BIrr ( ) follows the scaling behavior BIrr ( ) (cos2 + 2 RP sin2 ) 1/2 with the effective anisotropy factor RP 3 significantly smaller than the ass anisotropy would suggest. In spite of the strong effects of c-axis BaZrO3 nanorods, we found even greater enhancements of BIrr for fields along the ab planes than for fields parallel to the c-axis, as well as different temperature dependences of the correlated pinning contributions to BIrr for B//ab and B//c. Our results show that the dense and strong pins, which can now be incorporated into REBCO thin films in a controlled way, exert major and diverse effects on the measured vortex pinning anisotropy and the irreversibility field over wide ranges of B and T . In particular, we show that the relative contribution of correlated pinning to BIrr for B//c increases as the temperature increases due to the suppression of thermal fluctuations of vortices by splayed distribution of BaZrO3 nanorods.

  13. Structure and ferroelectric studies of (Ba{sub 0.85}Ca{sub 0.15})(Ti{sub 0.9}Zr{sub 0.1})O{sub 3} piezoelectric ceramics

    SciTech Connect (OSTI)

    Venkata Ramana, E.; Mahajan, A.; Graça, M.P.F.; Mendiratta, S.K.; Monteiro, J.M.; Valente, M.A.

    2013-10-15

    Graphical abstract: - Highlights: • (Ba{sub 0.85}Ca{sub 0.15})(Ti{sub 0.9}Zr{sub 0.1})O{sub 3} (BCTZO) ceramic was synthesized by the ceramic method. • In situ XRD and Raman spectra showed the phase transition of BCTZO around 360 K. • The ceramics showed a tunability of 82% at 40 kV cm{sup ?1} electric field. • BCTZO exhibited good quality factor of 111 at microwave frequencies. • Piezoforce microscopy studies indicated the switchability of ferroelectric domains. - Abstract: We have synthesized and studied the structural and ferroelectric properties of lead-free 0.5(Ba{sub 0.7}Ca{sub 0.3})TiO{sub 3}–0.5Ba(Zr{sub 0.2}Ti{sub 0.8})O{sub 3} ceramics in the temperature region of its ferroelectric transition. The synthesized material showed high dielectric constant, low loss and good pyroelectric figure of merit. From the temperature dependent X-ray diffraction measurements, we determined the tricritical point to be in the temperature range of 303–400 K. The dielectric measurements indicate a diffuse ferroelectric phase transition (DPT) around 360 K in agreement with the X-ray measurements. We studied the evolution of Raman spectra with temperature to understand the nature of phase transition in BaTiO{sub 3} (BTO) and the BCTZO. The results indicates that the transition of ferroelectric–paraelectric state is not sharp as in the case of BTO and the polar state persists through the paraelectric state. In general, our study indicates that there are ferroelectric domains of nanometer size beyond the commonly defined transition temperature. The observation of local piezoelectric hysteresis loop indicated the existence of intrinsic ferroelectric property of the ceramic at the nanoscale. The ceramics exhibited electric field tunable dielectric properties with a tunability of 82% at an applied DC field of 40 kV cm{sup ?1}, low dielectric loss of 0.001 and room temperature pyroelectric coefficient of 6 × 10{sup ?8} C cm{sup ?2} K{sup ?1} and the detectivity of 1.9 × 10{sup ?8} C cm{sup ?1} J{sup ?1}; larger than those reported for other BaTiO{sub 3}-based materials. Overall, our results indicate that BCTZO ceramics with coexistence of rhombohedral–tetragonal phases is a promising candidate for lead-free ferroelectric applications.

  14. 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)

    2013-12-23

    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.

  15. Elastic properties of perovskite ATiO{sub 3} (A?=?Be, Mg, Ca, Sr, and Ba) and PbBO{sub 3} (B?=?Ti, Zr, and Hf): First principles calculations

    SciTech Connect (OSTI)

    Pandech, Narasak; Limpijumnong, Sukit; Sarasamak, Kanoknan

    2015-05-07

    The mechanical properties of perovskite oxides depend on two metal oxide lattices that are intercalated. This provides an opportunity for separate tuning of hardness, Poisson's ratio (transverse expansion in response to the compression), and shear strength. The elastic constants of series of perovskite oxides were studied by first principles approach. Both A-site and B-site cations were systematically varied in order to see their effects on the elastic parameters. To study the effects of A-site cations, we studied the elastic properties of perovskite ATiO{sub 3} for A being Be, Mg, Ca, Sr, or Ba, one at a time. Similarly, for B-site cations, we studied the elastic properties of PbBO{sub 3} for B being Ti, Zr, or Hf, one at a time. The density functional first principles calculations with local density approximation (LDA) and generalized gradient approximation (GGA) were employed. It is found that the maximum C{sub 11} elastic constant is achieved when the atomic size of the cations at A-site and B-site are comparable. We also found that C{sub 12} elastic constant is sensitive to B-site cations while C{sub 44} elastic constant is more sensitive to A-site cations. Details and explanations for such dependencies are discussed.

  16. 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)

    2014-05-14

    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.

  17. from Sun RA * DEC * from Sun RA * DEC *

    E-Print Network [OSTI]

    Radial Distance 1way Light Time Velocity WRT Sun Distance from Sun Distance from Sun RA * DEC * Radial Distance 1way Light Time Velocity WRT Sun Distance from Sun Distance from Sun RA * DEC * AU hh

  18. Rapid determination of 226Ra in emergency urine samples

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

    Maxwell, Sherrod L.; Culligan, Brian K.; Hutchison, Jay B.; Utsey, Robin C.; McAlister, Daniel R.

    2014-02-27

    A new method has been developed at the Savannah River National Laboratory (SRNL) that can be used for the rapid determination of 226Ra in emergency urine samples following a radiological incident. If a radiological dispersive device event or a nuclear accident occurs, there will be an urgent need for rapid analyses of radionuclides in urine samples to ensure the safety of the public. Large numbers of urine samples will have to be analyzed very quickly. This new SRNL method was applied to 100 mL urine aliquots, however this method can be applied to smaller or larger sample aliquots as needed.more »The method was optimized for rapid turnaround times; urine samples may be prepared for counting in 226Ra from the urine sample matrix, followed by removal of calcium by cation exchange separation. A stacked elution method using DGA Resin was used to purify the 226Ra during the cation exchange elution step. This approach combines the cation resin elution step with the simultaneous purification of 226Ra with DGA Resin, saving time. 133Ba was used instead of 225Ra as tracer to allow immediate counting; however, 225Ra can still be used as an option. The rapid purification of 226Ra to remove interferences using DGA Resin was compared with a slightly longer Ln Resin approach. A final barium sulfate micro-precipitation step was used with isopropanol present to reduce solubility; producing alpha spectrometry sources with peaks typically 90 %), and removes interferences effectively. The sample preparation method can also be adapted to ICP-MS measurement of 226Ra, with rapid removal of isobaric interferences.« less

  19. Co.ra

    Office of Legacy Management (LM)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal Gas &SCE-SessionsSouth DakotaRobbins and Myers Co -VANaval ,, *' ;x-L* d! CTy,: y; ,Co.ra

  20. The analysis of Ytrium doped BaZrO3

    Office of Scientific and Technical Information (OSTI)

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  1. RA

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal GasAdministration Medal01 Sandia4) August 20123/%2A en NNSA sitesInformation/%2A en9/%2A

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

    SciTech Connect (OSTI)

    Ravkina, Olga; Klande, Tobias; Feldhoff, Armin

    2013-05-01

    The series of (Ba?.?Sr?.?)(Co?.?Fe?.?){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? 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?.?Sr{sub 0.5})(Co?.?Fe?.?)?.??Zr?.??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? 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?.?Sr?.?Co?.?Fe?.?O{sub 3–?} systematically doped with increasing amount of zirconium. • Cubic single-phase materials up to 3 wt% zirconium. • Mixed (Ba,Sr)ZrO? by-phase formed mainly in the grain boundaries. • Jänecke prism was proposed by XRD and EDXS data. • (Ba?.?Sr?.?)(Co?.?Fe?.?)?.??Zr?.??O{sub 3–?} showed a slight stabilization of oxygen flux as compared to pure Ba?.?Sr?.?Co?.?Fe?.?O{sub 3–?}.

  3. 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

  4. 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

  5. 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

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

    SciTech Connect (OSTI)

    Maxwell, S.

    2012-09-05

    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.

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

    E-Print Network [OSTI]

    Kumar, Raj; Vitturi, A

    2015-01-01

    $\\textit{Background}$: 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...

  8. Solid-State Coexistance of (Zr12) and (Zr6) Zirconium Oxocarboxylate Clusters

    SciTech Connect (OSTI)

    Malaestean, Lurie [RWTH Aachen University; Alici, Meliha Kutluca [RWTH Aachen University; Besson, Claire [RWTH Aachen University; Ellern, Arkady [Ames Laboratory; Kogerler, Paul [RWTH Aachen University

    2013-10-30

    Ligand metathesis, Co(II) coordination, and partial condensation reactions of an archetypal {Zr6} zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr6O8} and {Zr12O22}. Even minor modifications to the reaction conditions push this apparent equilibrium towards the {Zr6O8}-based product.

  9. Solid-state coexistence of {Zr12} and {Zr6} zirconium oxocarboxylate clusters

    SciTech Connect (OSTI)

    Malaestean, Iurie L. [RWTH Aachen University; Alici, Meliha Kutluca [RWTH Aachen University; Besson, Claire [RWTH Aachen University; Ellern, Arkady [Ames Laboratory; Kogerler, Paul [RWTH Aachen University

    2013-10-30

    Ligand metathesis, Co(II) coordination, and partial condensation reactions of an archetypal {Zr6} zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr6O8} and {Zr12O22}. Even minor modifications to the reaction conditions push this apparent equilibrium towards the {Zr6O8}-based product.

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

    SciTech Connect (OSTI)

    Witusiewicz, V.T.; Sommer, F.

    2000-04-01

    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. Decay of Ba-120 

    E-Print Network [OSTI]

    Xu, SW; Guo, J. S.; Yuan, S. G.; Liu, M. Q.; Hagberg, E.; Koslowsky, V. T.; Hardy, John C.; Dyck, G.; Schmeing, H.

    1992-01-01

    I CHI T A WI LB A R G E R WI S E OSD Average CO2 Emissions Reductions from RAC-DFW International Airport OSD Average Savings 6.55 MWh (August 15 - September 15 of 2005) + 10% Distribution and Transmision Loss 0.0000 0.2000 0.4000 0.6000 0.8000 1... s ) TXU E l e c tri c /P C A NO x R edu ct i o n s (l b s ) To t a l N o x Re du c t i o n s (l b s ) To t a l N o x Red u c t i o n s (T o n s ) BA STRO P 0 . 0 1 - 0 . 2 0...

  12. On the RA research reactor fuel management problems

    SciTech Connect (OSTI)

    Matausek, M.V.; Marinkovic, N.

    1997-12-01

    After 25 yr of operation, the Soviet-origin 6.5-MW heavy water RA research reactor was shut down in 1984. Basic facts about RA reactor operation, aging, reconstruction, and spent-fuel disposal have been presented and discussed in earlier papers. The following paragraphs present recent activities and results related to important fuel management problems.

  13. High critical currents in heavily doped (Gd,Y)Ba2Cu3Ox superconductor tapes

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

    Selvamanickam, V.; Gharahcheshmeh, M. Heydari; Xu, A.; Galstyan, E.; Delgado, L.; Cantoni, C.

    2015-01-20

    REBa2Cu3Ox superconductor tapes with moderate levels of dopants have been optimized for high critical current density in low magnetic fields at 77 K, but they do not exhibit exemplary performance in conditions of interest for practical applications, i.e., temperatures less than 50 K and fields of 2–30 T. Heavy doping of REBCO tapes has been avoided by researchers thus far due to deterioration in properties. Here, we report achievement of critical current densities (Jc) above 20 MA/cm2 at 30 K, 3 T in heavily doped (25 mol. % Zr-added) (Gd,Y)Ba2Cu3Ox superconductor tapes, which is more than three times higher thanmore »the Jc typically obtained in moderately doped tapes. Pinning force levels above 1000 GN/m3 have also been attained at 20 K. A composition map of lift factor in Jc (ratio of Jc at 30 K, 3 T to the Jc at 77 K, 0 T) has been developed which reveals the optimum film composition to obtain lift factors above six, which is thrice the typical value. A highly c-axis aligned BaZrO3 (BZO) nanocolumn defect density of nearly 7 × 1011 cm–2 as well as 2–3nm sized particles rich in Cu and Zr have been found in the high Jc films.« less

  14. Synthesis and characterization of lanthanum phosphate nanoparticles as carriers for 223Ra and 225Ra for targeted alpha therapy

    SciTech Connect (OSTI)

    Rojas Marin, Jessika V; Woodward, Jonathan; Chen, Nan; Rondinone, Adam Justin; Castano, Carlos H; Mirzadeh, Saed

    2015-01-01

    Introduction. Targeted alpha therapy (TAT) has the potential for killing specific tumor cells with minimum collateral damage to surrounding healthy tissue. Radionuclides such as 223Ra, 225Ra, and 225Ac are of special interest for radiotherapeutic applications as they emit multiple -particles during their decay. Utilizing appropriate carriers capable of retaining both the parent radioisotope as well as daughter products is important for the effective delivery of the radioisotope to the tumor site while mitigating global in vivo radiotoxicity. Methods. In this work, core and core+2 shells (NPs with 2 additional layers of cold LaPO4 deposited on the core surfaces) LaPO4 nanoparticles (NPs) were synthesized containing either 223Ra or 225Ra/225Ac and the retention of the parents and daughters within the NPs in vitro was investigated. Results. The NPs crystallized in rhabdophane phase with mean diameters of 3.4 and 6.3 nm for core and core+2 shells, respectively. The core LaPO 4 NPs retained up to 88% of 223Ra over 35 days. However, in the core+2 shell NPs, the retention of 223Ra and its daughter, 211Pb, was improved to > 99.9% over 27 days. Additionally, the retention of 225Ra/225Ac parents was > 99.98% and ~80% for the 221Fr and 213Bi daughters over 35 days for the core+2 shell NPs. Conclusions. These results suggest that LaPO4 NPs are potentially effective carriers of radium isotopes.

  15. SCINTILLATION PROPERTIES OF BaF2:Cd, BaF2, BaF2:Ce, BaF2:Sc, BaF2:Tm CRYSTALS AND CERAMICS; NEW PHOTOSENSORS FOR THE VACUUM ULTRAVIOLET REGION

    E-Print Network [OSTI]

    Titov, Anatoly

    SCINTILLATION PROPERTIES OF BaF2:Cd, BaF2, BaF2:Ce, BaF2:Sc, BaF2:Tm CRYSTALS AND CERAMICS; NEW crystals and ceramics doped with different elements in order to improve the light yield of the fast in the wavelength range from 190 to 600 nm. We used an improved method of ceramics production from the BaF2 powder

  16. Thermoelectric Transport in a ZrN/ScN Superlattice

    E-Print Network [OSTI]

    2009-01-01

    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/

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

    DOE Patents [OSTI]

    Driscoll, Judith L.; Foltyn, Stephen R.

    2010-06-15

    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. Fashion Marketing & Retailing BA (Hons) Key details

    E-Print Network [OSTI]

    Painter, Kevin

    Fashion Marketing & Retailing BA (Hons) Key details Duration: Full-time: 3 years (BA) / 4 years (BA Hons) Delivery type: Day Intake date: September Fees: 54000 AED per year Overview Our Fashion Marketing and Retailing programme confidently prepares students for a career within the marketing and retailing industry

  19. The Syntax of the Ba-Constructions

    E-Print Network [OSTI]

    Yan, Ling

    2004-01-01

    The Ba-construction has been widely discussed in the literature; however, few satisfactory studies have been carried out on the Ba-construction from a syntactic approach. In this paper 1 will argue for the fact that the Ba predicate describes a...

  20. Architecture BA (Hons) Key details

    E-Print Network [OSTI]

    Painter, Kevin

    Architecture BA (Hons) Key details Duration: 4 years (honours degree) Delivery type: Day Intake in the subject of Architecture, including a portfolio of Design, Technical and Theoretical courses covering all aspects of Architectural Theory and Practice. The course has been designed with reference to the RIBA

  1. Compression mode resonances in Zr-90 

    E-Print Network [OSTI]

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

    2004-01-01

    The giant resonance region from 10 MeV < E-x < 55 MeV in Zr-90 has been studied with inelastic scattering of 240 MeV alpha particles at small angles including 0degrees. The isoscalar monopole resonance was found to contain 100 +/- 12% of the E0...

  2. Valence electronenergy-lossspectroscopystudyofZrSiO4 and ZrO2

    SciTech Connect (OSTI)

    Spence, John; Jiang, Nan

    2013-07-01

    ZrSiO4 (zircon) and m-ZrO2 (zirconia) are fundamental and industrially important materials.This work reports the detailed valence electron energy-loss spectroscopy (VEELS) studies of these compounds. The dielectric response functions, as well as single-electron interband transition spectra,are derived from VEELS data for both ZrSiO4 and m-ZrO2, in the rang e5–50 eV using the Kramers–Kronig analysis method. Our interpretation of the interband transitions is given with the aid of ab initio calculations of density of states. The bandgap energies for both materials are also measured using VEELS.The surface and bulk plasmons are identified: the surface plasmon peaks locate at around 12 eV,and two bulk plasmon peaks are ~15–16 eV and ~25–27 eV,respectively.Although similarities in the VEELS exist between ZrSiO4 and m-ZrO2, two majo rdifferences are als onoticed and explained in terms of composition and structure differences.

  3. MARS15 DPA Update RaDIATE Meeting

    E-Print Network [OSTI]

    McDonald, Kirk

    energy Td (irregular function of atomic number) and displacement efficiency K(T). RaDIATE Meeting Energy Loss for Device Applications", IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 56, NO. 6, DECEMBER 2009.J. Boschini et al., "Nuclear and Non-Ionizing Energy-Loss for Coulomb Scattered Particles from Low Energy up

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

    E-Print Network [OSTI]

    Beckermann, Christoph

    Simulation of Heat Treatment Distortion R.A. Hardin1 and C. Beckermann2 1 Research Engineer, 2 Abstract This paper gives an overview of the problem of heat treatment stress and distortion and a review reported in the literature of heat treatment distortion on Navy-C rings made from 4140 and 8620 steel

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

    E-Print Network [OSTI]

    Spicer, Robert A

    ., Wang, Y.F., Spicer, R.A., Mosbrugger, V., Li, C.S., and Sun, Q.G., 2007, Climatic Reconstruction and Overlapping Distribution Analysis. American Journal of Botany, 94: 599-608. (30%) 104. Spicer, R and the Cold Month Mean Temperature. Journal of Geology, 112: 685-702. (60%) 97. Spic

  6. The Cult of Radrap (Ra dgra), nep of Wangdue Phodrang (Bhutan)

    E-Print Network [OSTI]

    Dorji, Tandin

    2008-01-01

    THE CULT OF RADRAP (RA DGRA), “NEP” OF WANGDUE PHODRANG (BHUTAN) Tandin Dorji Curriculum Officer, CAPSD, Paro, Bhutan Introduction ropitiated as a destroyer and worshipped as a creator, Radrap (Ra dgra), the guardian deity...

  7. Audit Report: OAS-RA-13-15 | Department of Energy

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

    Audit Report: OAS-RA-13-15 Audit Report: OAS-RA-13-15 March 21, 2013 The Department of Energy's Industrial Carbon Capture and Storage Program Funded by the American Recovery and...

  8. Special Report: OAS-RA-10-01 | Department of Energy

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

    OAS-RA-10-01 Special Report: OAS-RA-10-01 October 21, 2009 The Department of Energy's Quality Assurance Process for Prime Recipients' Reporting for the American Recovery and...

  9. Audit Report: OAS-RA-13-28 | Department of Energy

    Energy Savers [EERE]

    Audit Report: OAS-RA-13-28 Audit Report: OAS-RA-13-28 July 18, 2013 Costs Incurred by Selected Tribal Energy Efficiency and Conservation Block Grant Recipients Under the American...

  10. Examination Report: OAS-RA-13-01 | Department of Energy

    Office of Environmental Management (EM)

    Report: OAS-RA-13-01 Examination Report: OAS-RA-13-01 October 9, 2012 California Energy Commission - Energy Efficiency and Conservation Block Grant Program Funds Provided by...

  11. College of Arts & Sciences Psychology, BA

    E-Print Network [OSTI]

    New Mexico, University of

    College of Arts & Sciences Psychology, BA Broad Learning Goals A. Students will develop, predict, and influence behavior. C1. Students identify and critically evaluate psychological research

  12. Characteristics of Interconnected Delta-Hydride Precipitates in Zr

    SciTech Connect (OSTI)

    L.J. Carroll; M.R. Tonks; T.M. Lillo; B.S. Fromm; DC Haggard; T.C. Morris; W.D. Swank; T.L. Trowbridge; M.C. Carroll

    2014-09-01

    Characterization of extended delta-ZrH1.66 structures in unalloyed zirconium by electron backscatter diffraction analysis confirms that they consist of many interconnected precipitates of multiple, but distinctly related, orientations. The expected orientation relationship of (0001)a-Zr//(111)delta-ZrH1.66 is confirmed between the hydride and one of the surrounding a-Zr matrix grains. The delta-ZrH1.66 precipitates do not extend in a discrete crystalline orientation, but are regularly divided by 60° type {111} twins in which adjacent delta-ZrH1.66 grains share a {111} plane. The observed matching of the close-packed FCC planes of impinging or twinned hydrides within an interconnected structure enables the minimization of the overall interfacial energy through successive nucleation and growth events and twinning.

  13. Business Management BA / MA (Hons) Key details

    E-Print Network [OSTI]

    Painter, Kevin

    Business Management BA / MA (Hons) Key details Duration: Full-time: 3 years (BA) / 4 years (MSc Management degree programme follows a number of guiding principles that mirror the values of managers of leading organisations and reflect current business management thinking. In the first two years of all

  14. University of bA in Economics

    E-Print Network [OSTI]

    Oxford, University of

    University of Oxford bA in Economics and Management 2014/15 #12;uNIVersITy of oxford ba IN eCoNomICs aNd maNaGemeNT 2014/15 The Economics and Management undergraduate degree programme examines issues are allocated and coordinated to achieve the organisation's objectives. Economics and Management are ideal

  15. 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

    2008-04-16

    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.

  16. 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/Colorado <RAPID/Geothermal/Water Use/NevadaaTools <REpowerFormRSIRYPOS Inc Jump to:Ra

  17. PROJECT PROFILE: Ra Power Management, Inc. (Incubator 10) | Department of

    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 on Delicious Rank EERE: Alternative Fuelsof EnergyAprilEnergy EEREPlateauFolsom Labs (IncubatorEnergy Ra Power

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

    SciTech Connect (OSTI)

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

    1996-04-01

    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.

  19. Examination Report: OAS-RA-13-05 | Department of Energy

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

    Examination Report: OAS-RA-13-05 January 17, 2013 Prince George's County Department of Housing and Community Development - Weatherization Assistance Program Funds Provided by the...

  20. Examination Report: OAS-RA-13-06 | Department of Energy

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

    Examination Report: OAS-RA-13-06 January 17, 2013 Montgomery County Department of Housing and Community Affairs - Weatherization Assistance Program Funds Provided by the...

  1. Impact of Zr metal and coking reactions on the ex-vessel source term predictions of CORCON/VANESA

    SciTech Connect (OSTI)

    Lee, M.; Davis, R.E.; Khatib-Rahbar, M.

    1987-01-01

    During a core meltdown accident in a LWR, molten core materials (corium) could leave the reactor vessel and interact with concrete. In this paper, the impact of the zirconium content of the corium pool and the coking reaction on the release of fission products are quantified using CORCON/Mod2 and VANESA computer codes. Detailed calculations show that the total aerosol generation is proportional to the zirconium content of the corium pool. Among the twelve fission product groups treated by the VANESA code, CsI, Cs/sub 2/O and Nb/sub 2/O/sub 5/ are completely released over the course of the core/concrete interaction, while an insignificant quantity of Mo, Ru and ZrO/sub 2/ are predicted to be released. The release of BaO, SrO and Ce/sub 2/O increase, while the releases of Te and La/sub 2/O/sub 3/ are relatively unaffected by the Zr content of the corium pool. The impact of the coking reaction on the radionuclide release and aerosol production was found to be insignificant.

  2. DFT STUDY REVISES INTERSTITIAL CONFIGURATIONS IN HCP Zr

    SciTech Connect (OSTI)

    Samolyuk, German D; Golubov, Stanislav I; Osetskiy, Yury N; Stoller, Roger E

    2012-06-01

    Analysis of experimental result on microstructure evolution in irradiated Zr and alloys has demonstrated that available knowledge on self-interstitial defects in Zr is in contradiction. We therefore have initiated an extensive theoretical and modeling program to clarify this issue. In this report we present first ab initio calculations results of single SIA configurations in Zr. We demonstrate importance of simulations cell size, applied exchange-correlation functional and simulated c/a ratio. The results obtained demonstrate clearly that the most stable configurations are in basal plane and provide some evidences for enhanced interstitial transport along basal planes. The results obtained will be used in generation a new interatomic potential for Zr to be used in large-scale atomistic modeling of mechanisms relevant for radiation-induced microstructure evolution.

  3. Synthesis of Na-Stabilized Nonporous tZrO2 Supports and Pt/t-ZrO2 Catalysts and Application to Water-Gas-Shift Reaction

    E-Print Network [OSTI]

    Poeppelmeier, Kenneth R.

    steam reforming,10 and epoxidation of olefins.11 ZrO2 exists primarily in three different polymorphs significantly affect the catalytic performance for chemical reactions. Ma et al. prepared t-ZrO2 using Na2CO3 catalytic performance for methanol synthesis from CO hydrogenation compared to amorphous and m-ZrO2

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

    E-Print Network [OSTI]

    Latiolais, M. Paul

    on the first floor, and in the first floor lobby of the Ondine Building. Heat Broadway uses baseboard heating floor and retail space on the ground floor. Each studio features loft-like cement floors and a modern (503) 725-4404 RA After Hours On Call FYE (floors 3-7) (971) 246-1386 RA After Hours On Call Upper

  5. 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

    2012-07-12

    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.

  6. Department of Music modules -recommended reading for our two undergraduate courses: BA in Music and BA in Music Technology

    E-Print Network [OSTI]

    Sussex, University of

    Department of Music modules - recommended reading for our two undergraduate courses: BA in Music and BA in Music Technology These books are recommended selected Music Department modules (note that detailed week by week reading lists

  7. RaDON --Repair and Diagnosis in Ontology Networks Qiu Ji, Peter Haase, Guilin Qi, Pascal Hitzler, Steffen Stadtmuller

    E-Print Network [OSTI]

    Hitzler, Pascal

    RaDON -- Repair and Diagnosis in Ontology Networks Qiu Ji, Peter Haase, Guilin Qi, Pascal Hitzler by integrating multiple distributed ontologies. Our RaDON system pro- vides functionalities to repair ontologies. To meet the above mentioned needs, we develop the RaDON system to repair and diagnose not only

  8. BA: Art History Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    BA: Art History Fall--First Year · ART 127 New Major Seminar · ART 222 Caves to Cathedrals · Liberal Studies Program (LSP) coursework Fall--Second Year · ART 101 Art Studio Foundations I · ART 324 Renaissance Art · Liberal Studies Program (LSP) coursework Fall--Third Year · ART 328 Art of Greece & Rome

  9. BA: Art History Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    · ART 3/4xx (Art History) · Elective(s) (advisor approval) and/or LSP coursework Fall--Fourth Year · ART(s) and/or LSP coursework Spring--Fourth Year · ART 437 Senior Thesis II OR ART 3/4xx (Art HistoryBA: Art History Fall--First Year · ART 127 New Major Seminar · ART 222 Caves to Cathedrals

  10. Arts & Sciences Biology, B.A.

    E-Print Network [OSTI]

    New Mexico, University of

    6/7/13 Arts & Sciences Biology, B.A. Broad Learning Goals A. Understand basic biological principles, and appreciate the breadth of modern biology. B. Understand and apply the scientific principle to conceptual or experimental problems in biology. C. Present biological data, and interpretations of the data, in written

  11. College of Arts & Sciences Mass Communication, BA

    E-Print Network [OSTI]

    New Mexico, University of

    College of Arts & Sciences Mass Communication, BA Broad Learning Goals A. Students should have core values associated with the practice of journalism and mass communication. B. Students should have concrete skills in order to be effective practitioners of journalism and mass communication. Student

  12. College of Arts & Sciences Economics, BA

    E-Print Network [OSTI]

    New Mexico, University of

    1/15/2009 College of Arts & Sciences Economics, BA Broad Learning Goals A. Theory: Mastery of basic economic theory. B. Institutional Context: Familiarity with institutions that shape economic behavior. C, evaluate and critique economic models. E. Communication F. Economic Citizenship Student Learning Outcomes A

  13. College of Arts & Sciences Chemistry, BA

    E-Print Network [OSTI]

    New Mexico, University of

    1/13/2009 College of Arts & Sciences Chemistry, BA Broad Learning Goals A. Students graduating from of chemistry. B. Students graduating from this program will be able to employ critical thinking and hypothesis and be familiar with the status of current research in the field of chemistry. D5. Students will be able

  14. High sensitivity measurement of 224Ra and 226Ra in water with an improved hydrous titanium oxide technique at the Sudbury Neutrino Observatory

    E-Print Network [OSTI]

    B. Aharmim; B. T. Cleveland; X. Dai; G. Doucas; J. Farine; H. Fergani; R. Ford; R. L. Hahn; E. D. Hallman; N. A. Jelley; R. Lange; S. Majerus; C. Mifflin; A. J. Noble; H. M. O'Keeffe; R. Rodriguez-Jimenez; D. Sinclair; M. Yeh

    2009-02-01

    The existing hydrous titanium oxide (HTiO) technique for the measurement of 224Ra and 226Ra in the water at the Sudbury Neutrino Observatory (SNO) has been changed to make it faster and less sensitive to trace impurities in the HTiO eluate. Using HTiO-loaded filters followed by cation exchange adsorption and HTiO co-precipitation, Ra isotopes from 200-450 tonnes of heavy water can be extracted and concentrated into a single sample of a few millilitres with a total chemical efficiency of 50%. Combined with beta-alpha coincidence counting, this method is capable of measuring 2.0x10^3 uBq/kg of 224Ra and 3.7x10^3 uBq/kg of 226Ra from the 232Th and 238U decay chains, respectively, for a 275 tonne D2O assay, which are equivalent to 5x10^16 g Th/g and 3x10^16 g U/g in heavy water.

  15. Effect of substituting of S for O: The sulfide perovskite BaZrS3 investigated with density functional theory

    E-Print Network [OSTI]

    Rappe, Andrew M.

    February 2009; revised manuscript received 16 April 2009; published 9 June 2009 We use first-principles to the rotation and expansion of the B-X6 octahedra. Such octahedral rotations often generate a low, respectively, these cations move in a concerted manner, so PbTiO3 t=1.02 is ferro- electric. Ferroelectric ABO3

  16. Gabriele Simi1 BaBar SVT: Radiation Damage and BaBar SVT: Radiation Damage and

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    Gabriele Simi1 BaBar SVT: Radiation Damage and BaBar SVT: Radiation Damage and Other OperationalBar and SVTIntro to BaBar and SVT Radiation Environment Damage to Si Detectors Damage to Front End Electronics for Photon and KL detection DIRC for K/ separation DCH for charged particle tracking SVT for tracking

  17. Page 1 | B.A. in Geography | Academic Plan of Study Updated April 2014 B.A. in Geography

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Geography | Academic Plan of Study Updated April 2014 B.A. in Geography Academic Plan of Study College of Liberal Arts & Sciences Department of Geography & Earth Sciences geoearth is available with the BA in Geography, along with cognate coursework in history and political science

  18. 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...

  19. Audit Report: OAS-RA-13-31 | Department of Energy

    Energy Savers [EERE]

    Audit Report: OAS-RA-13-31 September 27, 2013 The Department of Energy's Hydrogen and Fuel Cells Program The Department of Energy spent approximately 1 billion over the last 5...

  20. RSC Advances c3ra45350b Bisindolines from the reaction of 3,5-

    E-Print Network [OSTI]

    Jones, William D.

    RSC Advances c3ra45350b PAPER 1 Bisindolines from the reaction of 3,5- dimethoxyaniline synthesized from the reaction of 3,5-dimethoxyaniline and vicinal diones (2,3-butanedione, benzil, and 4-methylbenzil). ART C3RA45350B_GRABS 1 5 10 15 20 25 30 35 40 45 50 1 5 10 15 20 25 30 35 40 45 50 #12;Queries

  1. Interdiffusion and Reaction between Zr and Al Alloys from 425 degrees to 625 degrees C

    SciTech Connect (OSTI)

    J. Dickson; L. Zhou; A. Ewh; M. Fu; D. D. Keiser, Jr.; Y. H. Sohn; A. Paz y Puente

    2014-06-01

    Zirconium has recently garnered attention for use as a diffusion barrier between U–Mo nuclear fuels and Al cladding alloys. Interdiffusion and reactions between Zr and Al, Al-2 wt.% Si, Al-5 wt.% Si or AA6061 were investigated using solid-to-solid diffusion couples annealed in the temperature range of 425 degrees to 625 degrees C. In the binary Al and Zr system, the Al3Zr and Al2Zr phases were identified, and the activation energy for the growth of the Al3Zr phase was determined to be 347 kJ/mol. Negligible diffusional interactions were observed for diffusion couples between Zr vs. Al-2 wt.% Si, Al-5 wt.% Si and AA6061 annealed at or below 475 degrees C. In diffusion couples with the binary Al–Si alloys at 560 degrees C, a significant variation in the development of the phase constituents was observed including the thick t1 (Al5SiZr2) with Si content up to 12 at.%, and thin layers of (Si,Al)2Zr, (Al,Si)3Zr, Al3SiZr2 and Al2Zr phases. The use of AA6061 as a terminal alloy resulted in the development of both T1 (Al5SiZr2) and (Al,Si)3Zr phases with a very thin layer of (Al,Si)2Zr. At 560 degrees C, with increasing Si content in the Al–Si alloy, an increase in the overall rate of diffusional interaction was observed; however, the diffusional interaction of Zr in contact with multicomponent AA6061 with 0.4–0.8 wt.% Si was most rapid.

  2. The AMiBA Hexapod Telescope Mount

    E-Print Network [OSTI]

    Koch, Patrick M; Nishioka, Hiroaki; Jiang, Homin; Lin, Kai-Yang; Umetsu, Keiichi; Huang, Yau-De; Raffin, Philippe; Chen, Ke-Jung; Ibanez-Romano, Fabiola; Chereau, Guillaume; Chen, Ming-Tang; Ho, Paul T P; Pausch, Konrad; Willmeroth, Klaus; Altamirano, Pablo; Chang, Chia-Hao; Chang, Shu-Hao; Chang, Su-Wei; Han, Chih-Chiang; Kubo, Derek; Li, Chao-Te; Liu, Guo-Chin; Martin-Cocher, Pierre; Oshiro, Peter; Wei, Ta-Shun; Birkinshaw, Mark; Lancaster, Katy; Lo, Kwok Yung; Martin, Robert N; Molnar, Sandor M; Patt, Ferdinand; Romeo, Bob

    2009-01-01

    AMiBA is the largest hexapod astronomical telescope in current operation. We present a description of this novel hexapod mount with its main mechanical components -- the support cone, universal joints, jack screws, and platform -- and outline the control system with the pointing model and the operating modes that are supported. The AMiBA hexapod mount performance is verified based on optical pointing tests and platform photogrammetry measurements. The photogrammetry results show that the deformations in the inner part of the platform are less than 120 micron rms. This is negligible for optical pointing corrections, radio alignment and radio phase errors for the currently operational 7-element compact configuration. The optical pointing error in azimuth and elevation is successively reduced by a series of corrections to about 0.4 arcmin rms which meets our goal for the 7-element target specifications.

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

    E-Print Network [OSTI]

    El-Monier, Ilham Abdallah

    2013-01-18

    tests showed that this new chemical was effective, and unlike previous Al-based and Zr-based stabilizers (hydroxy aluminum and zirconium oxychloride solutions), it did not dissolve in acids and worked very well up to 300oF. Stabilizer A proved...

  4. Neutron capture on {sup 94}Zr: Resonance parameters and Maxwellian-averaged cross sections

    SciTech Connect (OSTI)

    Tagliente, G. [Istituto Nazionale di Fisica Nucleare (INFN), Bari (Italy); University of Gent (Belgium); Milazzo, P. M.; Fujii, K.; Abbondanno, U.; Belloni, F.; Moreau, C. [Istituto Nazionale di Fisica Nucleare (INFN), Trieste (Italy); Aerts, G.; Andriamonje, S.; Berthoumieux, E.; Dridi, W.; Gunsing, F.; Pancin, J.; Perrot, L.; Plukis, A. [CEA/Saclay-IRFU, Gif-sur-Yvette (France); Alvarez, H.; Duran, I.; Paradela, C. [Universidade de Santiago de Compostela (Spain); Alvarez-Velarde, F.; Cano-Ott, D.; Embid-Segura, M. [Centro de Investigaciones Energeticas Medioambientales y Technologicas, Madrid (Spain)

    2011-07-15

    The neutron capture cross sections of the Zr isotopes play an important role in nucleosynthesis studies. The s-process reaction flow between the Fe seed and the heavier isotopes passes through the neutron magic nucleus {sup 90}Zr and through {sup 91,92,93,94}Zr, but only part of the flow extends to {sup 96}Zr because of the branching point at {sup 95}Zr. Apart from their effect on the s-process flow, the comparably small isotopic (n,{gamma}) cross sections make Zr also an interesting structural material for nuclear reactors. The {sup 94}Zr (n,{gamma}) cross section has been measured with high resolution at the spallation neutron source n{sub T}OF at CERN and resonance parameters are reported up to 60 keV neutron energy.

  5. 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.; Valant, M.; Williams, J. R.; Bugnet, M.; Botton, G. A.; Ohashi, N.; Sakka, Y.

    2012-10-15

    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.

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

    SciTech Connect (OSTI)

    Min Xu

    2008-08-18

    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.

  7. RPC Experience: Belle, BaBar And BESIII

    SciTech Connect (OSTI)

    Lu, Changguo; /Princeton U.

    2006-03-10

    In this article the performance and experience of three large RPC systems in the running/future experiments are summarized: Belle, BaBar and BESIII.

  8. Abnormal thermal conductivity in tetragonal tungsten bronze Ba...

    Office of Scientific and Technical Information (OSTI)

    temperature interval. Substitution of Sr for Ba brings about a significant decrease in thermal conductivity at x???3 accompanied by development of a low-temperature...

  9. Bachelor of Arts (BA) Geography Bachelor of Science (BSc)

    E-Print Network [OSTI]

    Molinari, Marc

    Bachelor of Arts (BA) Geography Bachelor of Science (BSc) Geography Bachelor of Science (BSc) Geography with Geology Bachelor of Science (BSc) Geography and Oceanography Student Handbook 2014

  10. Electric-field gradients at the Zr sites in Zr3Fe: Measured using perturbed-angular-correlation spectroscopy and calculated using band theory

    E-Print Network [OSTI]

    Motta, Arthur T.

    Electric-field gradients at the Zr sites in Zr3Fe: Measured using perturbed-angular-correlation spectroscopy and calculated using band theory Arthur T. Motta, Stephen E. Cumblidge, and Gary L. Catchen; published 13 December 2001 We have measured the electric-field-gradient EFG parameters VZZ

  11. IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 34, NO. 4, AUGUST 2006 1105 A Study of ZrN/Zr Coatings Deposited on

    E-Print Network [OSTI]

    Zheng, Yufeng

    IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 34, NO. 4, AUGUST 2006 1105 A Study of ZrN/Zr Coatings/metal coatings were deposited onto NiTi shape-memory alloy using plasma immersion ion im- plantation, such as unbalanced magnetron sputtering, ion plat- ing, ion-beam-assisted deposition, cathodic-vacuum-arc evapo

  12. Ra-226 concentrations in otter, Lutra canadensis, trapped near uranium tailings at Elliot Lake, Ontario

    SciTech Connect (OSTI)

    Wren, C.D.; Cloutier, N.R.; Lim, T.P.; Dave, N.K.

    1987-02-01

    The Elliot Lake area of Ontario, is currently the major uranium producing region of Canada. It is estimated there are 120 million tons of uranium tailings spread over 600 ha in the vicinity of Elliot Lake. The transfer and fate of uranium-series radionuclides from tailing sites remain primary ecological concerns in these areas. It has been demonstrated that the levels of radionuclides, including Ra-226, are elevated in vegetation, small mammals and fish living on or near tailing disposal sites. However, the transfer potential of Ra-226 to predatory species has not been examined in detail. The objective of this study was to measure Ra-226 levels in otters (Lutra canadensis), captured near tailing sites, to provide further information on the fate of radionuclides in the environment.

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

    Energy Savers [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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematics AndBerylliumDepartmentResolution of Significant36 AuditAuditOAS-RA-09-03OAS-RA-11-15

  14. 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

  15. GEOLOGY, B.A. (Fall 2015-Summer 2016)

    E-Print Network [OSTI]

    Hamburger, Peter

    GEOLOGY, B.A. (Fall 2015-Summer 2016) IPFW Residency Requirements: ____ 32 credits at 200 level credits 300­400 level ____2.0 GPA Degree/Major/Gen Ed ____C- or above in Major/Gen Ed GEOLOGY BA CORE in Geology or Geography with Laboratory (Select 1 of the following): ___3 GEOL G103 Earth Science: Materials

  16. Psychology, BA (degree available as of Fall 2012) Declaring Your

    E-Print Network [OSTI]

    Kunkle, Tom

    Psychology, BA (degree available as of Fall 2012) Declaring Your Psychology Major and Degree Path All students who have not declared Psychology as their major yet: All students, regardless of their catalog year, can declare the Psychology, BA path in the Program of Study Management (POSM) system. Use

  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.

    2007-01-01

    We report a joint experimental and theoretical investigation of superconductivity in Ga-substituted type-I silicon clathrates. We prepared samples of the general formula Ba8Si46-xGax, with different values of x. We show that Ba8Si40Ga6 is a bulk...

  18. BaBar Note 323 Temperature Monitoring and Interlocks

    E-Print Network [OSTI]

    BaBar Note 323 Temperature Monitoring and Interlocks for the BaBar SVT Front-End Electronics David 35 2 #12;1 Introduction This document describes the temperature monitoring and interlocks for the SVT to preventavoidable damage to the HDI 1 . The secondary requirement of this system is to monitor HDI temperatures

  19. BaBar Note 302 Monitoring Requirements of

    E-Print Network [OSTI]

    : : : : : : : : : : : : : : : : : : : : 19 3 Position Monitoring 21 4 Temperature Monitoring 25 4.1 Mechanical StructureBaBar Note 302 Monitoring Requirements of the BaBar Silicon Vertex Tracker Pat Burchat, David the requirements for many of the monitoring tasks associated with the silicon vertex tracker SVT. It covers

  20. 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

  1. Optical Floating Zone Growth of -BaB2O4 from a LiBa2B5O10-Based Solvent

    E-Print Network [OSTI]

    Marks, Laurence D.

    Optical Floating Zone Growth of -BaB2O4 from a LiBa2B5O10-Based Solvent Shilie Pan, Jared P. Smit metaborate -BaB2O4 has been grown using a LiBa2B5O10-based solvent in a four-mirror optical floating zone furnace with a traveling solvent zone configuration. The -BaB2O4 rods grown are composed of several

  2. Radioactive contamination of BaF2 crystal scintillator

    E-Print Network [OSTI]

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

    2013-12-17

    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.

  3. Radiation damage in cubic-ZrO2 and yttria-stabilized zirconia from molecular dynamics simulations

    SciTech Connect (OSTI)

    Aidhy, Dilpuneet S; Zhang, Yanwen; Weber, William J

    2015-01-01

    We perform molecular dynamics simulation on cubic ZrO2 and yttria-stabilized zirconia (YSZ) to elucidate defect cluster formation resulting from radiation damage, and evaluate the impact of Y-dopants. Interstitial clusters composed of split-interstitial building blocks, i.e., Zr-Zr or Y-Zr are formed. Oxygen vacancies control cation defect migration; in their presence, Zr interstitials aggregate to form split-interstitials whereas in their absence Zr interstitials remain immobile, as isolated single-interstitials. Y-doping prevents interstitial cluster formation due to sequestration of oxygen vacancies.

  4. Page 1 | B.A. in History | Academic Plan of Study Updated June 2015 B.A. in History

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in History | Academic Plan of Study Updated June 2015 B.A. in History Academic Plan of Study College of Liberal Arts & Sciences Department of History history.uncc.edu PROGRAM SUMMARY · Credit · Advising (For General Education): by History department advisors · Minimum Grades/GPA: GPA of 2

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

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Art | Academic Plan of Study Updated March 2014 B.A. in Art Academic Plan of Study College of Arts + Architecture Department of Art and Art History art.uncc.edu PROGRAM SUMMARY · Credit Academic Advisor before declaring the Art major. Submission of digital portfolio of creative work required

  6. Page 1 | B.A. in Physics | Academic Plan of Study Updated April 2014 B.A. in Physics

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Physics | Academic Plan of Study Updated April 2014 B.A. in Physics Academic Plan of Study College of Liberal Arts & Sciences Department of Physics and Optical Science physics declare a Physics major in their freshman or sophomore year. · Advising (For the Major): o Dr. Pedram

  7. Page 1 | B.A. in Chemistry | Academic Plan of Study Updated May 2015 B.A. in Chemistry

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Chemistry | Academic Plan of Study Updated May 2015 B.A. in Chemistry Academic Plan of Study College of Liberal Arts & Sciences Department of Chemistry chemistry.uncc.edu PROGRAM. · Advising (For the Major): completed by your chemistry faculty advisor (please refer to your 49er Banner

  8. 1 BA/BS with a Major in Chemistry, Concentration in Forensic Chemistry BA/BS WITH A MAJOR IN

    E-Print Network [OSTI]

    Vertes, Akos

    Laboratory CHEM 3165 Biochemistry I CHEM 4122 Instrumental Analytical Chemistry CHEM 4134 Descriptive Instrumental Analytical Chemistry CHEM 4123 Instrumental Analytical Chemistry Laboratory CHEM 4134 (if1 BA/BS with a Major in Chemistry, Concentration in Forensic Chemistry BA/BS WITH A MAJOR

  9. http://znaturforsch.com/IEO/B302.pdf Compression Behavior of Zr-doped Nanoanatase

    E-Print Network [OSTI]

    Steinle-Neumann, Gerd

    -pressure, Nanocrystals, Titania, Zirconia, Anatase, Dopant Introduction Titania TiO2, zirconia ZrO2, as well as zirconium

  10. Microstructural studies on cast Zr[sub 3]Al-3wt%Nb

    SciTech Connect (OSTI)

    Tewari, R.; Dey, G.K.; Mukhopadhyay, P.; Banerjee, S. . Metallurgy Div.)

    1994-05-01

    In the binary Zr-Al system, Zr[sub 3]Al is the intermetallic phase richest in zirconium. In view of its low absorption cross section for thermal neutrons and its good strength and corrosion resistance, Zr[sub 3]Al may have possible applications as a structural material in thermal reactors. This phase has the ordered cubic L1[sub 2] structure and forms through the peritectoid reaction: [beta]-Zr + Zr[sub 2]Al[minus] > Zr[sub 3]Al, the reaction temperature being 1,292 K. Structurally Zr[sub 3]Al is quite similar to the [alpha][sub 2] or the Ti[sub 3]Al phase (ordered hexagonal DO[sub 19] structure) in the Ti-Al system, the two structures differing only in the stacking sequence of the close packed atomic layers. But for its inherent brittleness, Ti[sub 3]Al is a promising structural material for aerospace applications. It has, however, been demonstrated that niobium additions can reduce the brittleness of this phase. Studies on the Ti[sub 3]Al-Nb system have also shown that niobium stabilizes the high temperature [beta] phase (bcc structure) which, on cooling, can decompose through various phase reactions, generating some interesting microstructures. Similar studies on the Zr[sub 3]Al-Nb system have not been reported yet. The present paper describes some microstructural observations made on a cast Zr[sub 3]Al-3wt%Nb alloy.

  11. Distinguished Lecture in International Justice and Human Rights Prince Zeid Ra'ad Zeid Al-Hussein

    E-Print Network [OSTI]

    Snider, Barry B.

    Distinguished Lecture in International Justice and Human Rights Prince Zeid Ra'ad Zeid Al Brandeis University was honored to host His Royal Highness Prince Zeid Ra'ad Zeid Al Life with the generous support of the Planethood Foundation. Prince Zeid was introduced by Donald

  12. Experimental Implementation of Robotic Sequential Nuclear Search R.A. Cortez, H. G. Tanner,

    E-Print Network [OSTI]

    Tanner, Herbert G.

    Experimental Implementation of Robotic Sequential Nuclear Search R.A. Cortez, H. G. Tanner, A work on automated nuclear search, by taking the principle of a bidirectional, real time interaction is in demonstrating that automated nuclear search is feasible, can be performed with commercially available robotic

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

    SciTech Connect (OSTI)

    Ehst, D. A.; Nuclear Engineering Division

    2009-10-02

    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.

  14. 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

  15. Thermodynamic Modeling and Experimental Study of the Fe-Cr-Zr System

    SciTech Connect (OSTI)

    Yang, Ying; Tan, Lizhen; Bei, Hongbin; Busby, Jeremy T

    2013-01-01

    Wide applications of zircaloys, stainless steels and their interactions in nuclear reactors require the knowledge on phase stability and thermodynamic property of the Fe-Cr-Zr system. This knowledge is also important to develop new Zr-contained Fe-Cr ferritic steels. This work aims at developing thermodynamic models for describing phase stability and thermodynamic property of the Fe-Cr-Zr system using the Calphad approach coupled with experimental study. Thermodynamic descriptions of the Fe-Cr and Cr-Zr systems were either directly adopted or slightly modified from literature. The Fe-Zr system has been remodeled to accommodate recent ab-initio calculation of formation enthalpies of various Fe-Zr compounds. Reliable ternary experimental data and thermodynamic models were mainly available in the Zr-rich region. Therefore, selected ternary alloys located in the vicinity of the eutectic valley of (Fe,Cr,Zr) and (Fe,Cr)2Zr laves phase in the Fe-rich region have been experimentally investigated in this study. Microstructure has been examined by using scanning electron microscope, energy-dispersive Xray spectroscopy and X-ray diffraction. These experimental results, along with the literature data were then used to develop thermodynamic models for phases in the Fe-Cr-Zr system. Calculated phase equilibria and thermodynamic properties of the ternary system yield satisfactory agreements with available experimental data, which gives the confidence to use these models as building blocks for developing a Zr, Fe and Cr contained multicomponent thermodynamic database for broader applications in nuclear reactors.

  16. Sub-barrier fusion of 32S+90,96Zr: semi-classical coupled-channels approach

    E-Print Network [OSTI]

    H. Q. Zhang; C. J. Lin; F. Yang; H. M. Jia; X. X. Xu; F. Jia; Z. D. Wu; S. T. Zhang; Z. H. Liu; A. Richard; C. Beck

    2010-05-05

    The fusion excitation functions have been measured with rather good accuracy for 32S+90Zr and 32S+96Zr near and below the Coulomb barrier. The sub-barrier cross sections for 32S+96Zr are much larger compared with 32S+90Zr. Semi-classical coupled-channels calculations including two-phonon excitations are capable to describe sub-barrier enhancement only for 32S+90Zr. The remaining disagreement for 32S+96Zr comes from the positive Q-value intermediate neutron transfers in this system. The comparison with 40Ca+96Zr suggests that couplings to the positive Q-value neutron transfer channels may play a role in the sub-barrier fusion enhancement. A rather simple model calculation taking neutron transfers into account is proposed to overcome the discrepancies of 32S+96Zr.

  17. Zr electrorefining process for the treatment of cladding hull waste in LiCl-KCl molten salts

    SciTech Connect (OSTI)

    Lee, Chang Hwa; Lee, You Lee; Jeon, Min Ku; Kang, Kweon Ho; Choi, Yong Taek; Park, Geun Il [Korea Atomic Energy Research Institute - KAERI, 989-111 Daeduk-daero, Yuseong-gu, Daejeon 305-353 (Korea, Republic of)

    2013-07-01

    Zr electrorefining for the treatment of Zircaloy-4 cladding hull waste is demonstrated in LiCl-KCl-ZrCl{sub 4} molten salts. Although a Zr oxide layer thicker than 5 ?m strongly inhibits the Zr dissolution process, pre-treatment processes increases the dissolution kinetics. For 10 g-scale experiments, the purities of the recovered Zr were 99.54 wt.% and 99.74 wt.% for fresh and oxidized cladding tubes, respectively, with no electrical contact issue. The optimal condition for Zr electrorefining has been found to improve the morphological feature of the recovered Zr, which reduces the salt incorporation by examining the effect of the process parameters such as the ZrCl{sub 4} concentration and the applied potential.

  18. 688 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 13, NO. 4, AUGUST 2004 Zirconium Tungstate (ZrW2O8)-Based

    E-Print Network [OSTI]

    Talghader, Joseph J.

    688 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 13, NO. 4, AUGUST 2004 Zirconium Tungstate (Zr expansion, sputtering, thermal factors, thin film, zirconium tungstate (ZrW2O8). I. INTRODUCTION THERMAL

  19. THE JOURNAL OF CHEMICAL PHYSICS 135, 104303 (2011) The visible spectrum of zirconium dioxide, ZrO2

    E-Print Network [OSTI]

    Maier, John Paul

    2011-01-01

    THE JOURNAL OF CHEMICAL PHYSICS 135, 104303 (2011) The visible spectrum of zirconium dioxide, ZrO2; published online 8 September 2011) The electronic spectrum of a cold molecular beam of zirconium dioxide, Zr

  20. Synthesis, crystal structure and properties of SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?}

    SciTech Connect (OSTI)

    Volkova, N.E.; Gavrilova, L.Ya. [Department of Chemistry, Ural Federal University, Yekaterinburg (Russian Federation); Cherepanov, V.A., E-mail: Vladimir.Cherepanov@usu.ru [Department of Chemistry, Ural Federal University, Yekaterinburg (Russian Federation); Aksenova, T.V. [Department of Chemistry, Ural Federal University, Yekaterinburg (Russian Federation); Kolotygin, V.A.; Kharton, V.V. [Department of Materials and Ceramic Engineering, CICECO, University of Aveiro (Portugal)

    2013-08-15

    The solid solution formation range in the SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?} (0?x?2) system examined at 1100 °C in air corresponds to 0?x?1.1. The crystal structure of SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?} with x?0.5 was described as orthorhombic (space group Pmmm), and with 0.6?x?1.1—as tetragonal (P4/mmm). The introduction of iron into the cobalt sublattice leads to a gradual increase of the unit cell parameters and volume, accompanied with increasing oxygen content determined by thermogravimetry. The dilatometric curves collected at 25–1100 °C in air exhibit moderate nonlinearities associated with the orthorhombic?tetragonal phase transition, as confirmed by the high-temperature X-ray diffraction analysis. Temperature dependencies of the electrical conductivity measured by 4-probe dc method in the temperature range 25–1000 °C in air display maxima at 300–350 °C, whilst the conductivity decreases with iron additions. These trends were discussed in terms of the defect structure and nature of the main charge carriers in SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?}. It was also shown that SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?} is chemically stable with respect to the Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} solid electrolyte up to 1100 °S, but reacts with Zr{sub 0.85}Y{sub 0.15}O{sub 1.93} even at 900 °S. Highlights: • The solid solution formation range in the SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?} system at 1100 °C in air corresponds to 0?x?1.1. • The unit cell volume and oxygen content in the solid solutions increase with x. • Oxygen nonstoichiometry of SmBaCo{sub 2?x}Fe{sub x}O{sub 5+?} solid solutions. • Temperature dependencies of the electrical conductivity exhibit maxima at the temperatures when oxygen exchange with the gaseous phase becomes significant.

  1. Properties of Porous TiNbZr Shape Memory Alloy Fabricated by Mechanical Alloying

    E-Print Network [OSTI]

    Zheng, Yufeng

    , with subsequent hot or cold rolling, were used to fabricate these Ni-free SMAs. There is no work related to powderNb-6Zr (at.%) shape memory alloys produced using elemental powders by means of mechanical alloying by adding ternary elements, including Molybdenum (Mo), Palladium (Pd), Tin (Sn), Zirconium (Zr), etc. Ping

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

    E-Print Network [OSTI]

    Motta, Arthur T.

    Phase formation in Zr­Fe multilayers: Effect of irradiation A. T. Motta The Pennsylvania State Science Division, Argonne National Laboratory, Argonne, Illinois 60403 M. E. Bru¨ckmann, S. R. Teixeira a detailed in situ study of phase formation in Zr­Fe metallic multilayers using irradiation and thermal

  3. Local structures surrounding Zr in nanostructurally stabilized cubic zirconia: Structural origin of phase stability

    SciTech Connect (OSTI)

    Soo, Y. L.; Chen, P. J.; Huang, S. H.; Shiu, T. J.; Tsai, T. Y.; Chow, Y. H.; Lin, Y. C.; Weng, S. C.; Chang, S. L. [Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Wang, G.; Cheung, C. L. [Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States); Sabirianov, R. F.; Mei, W. N. [Department of Physics, University of Nebraska at Omaha, Omaha, Nebraska 68182 (United States); Namavar, F.; Haider, H.; Garvin, K. L. [Department of Orthopaedics Surgery and Rehabilitation, University of Nebraska Medical Center, Omaha, Nebraska 68198 (United States); Lee, J. F. [National Synchrotron Radiation Research Center, Hsinchu 30013, Taiwan (China); Lee, H. Y.; Chu, P. P. [Department of Chemistry, National Central University, Jhongli 32001, Taiwan (China)

    2008-12-01

    Local environment surrounding Zr atoms in the thin films of nanocrystalline zirconia (ZrO{sub 2}) has been investigated by using the extended x-ray absorption fine structure (EXAFS) technique. These films prepared by the ion beam assisted deposition exhibit long-range structural order of cubic phase and high hardness at room temperature without chemical stabilizers. The local structure around Zr probed by EXAFS indicates a cubic Zr sublattice with O atoms located on the nearest tetragonal sites with respect to the Zr central atoms, as well as highly disordered locations. Similar Zr local structure was also found in a ZrO{sub 2} nanocrystal sample prepared by a sol-gel method. Variations in local structures due to thermal annealing were observed and analyzed. Most importantly, our x-ray results provide direct experimental evidence for the existence of oxygen vacancies arising from local disorder and distortion of the oxygen sublattice in nanocrystalline ZrO{sub 2}. These oxygen vacancies are regarded as the essential stabilizing factor for the nanostructurally stabilized cubic zirconia.

  4. Grain growth in ZrFe thin films during in situ ion irradiation in a TEM

    E-Print Network [OSTI]

    Motta, Arthur T.

    Grain growth in Zr­Fe thin films during in situ ion irradiation in a TEM D. Kaoumi a,*, A.T. Motta Laboratory, Argonne, IL 060493, USA Available online 2 November 2005 Abstract In situ ion-beam irradiation was used to study irradiation induced grain growth in co-sputter-deposited Zr/xFe (0% 6 x 6 4

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

    SciTech Connect (OSTI)

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

    2013-10-01

    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.

  6. THREE-DIMENSIONAL ATOMIC STRUCTURE OF NiO ZrO2(CUBIC) INTERFACES

    E-Print Network [OSTI]

    Pennycook, Steve

    THREE-DIMENSIONAL ATOMIC STRUCTURE OF NiO± ZrO2(CUBIC) INTERFACES E. C. DICKEY{1 , V. P. DRAVID1-dimensional atomic structure of low-energy NiO±ZrO2(cubic) interfaces is determined through a combination of electron the structural and chemical aspects of the interface and associ- ated interfacial relaxation mechaubic) interface

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

    SciTech Connect (OSTI)

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

    2012-03-01

    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.

  8. Active eutectoid decomposition in Zr-3 wt.% Fe

    SciTech Connect (OSTI)

    Kumar, L.; Ramanujan, R.V.; Tewari, R.; Mukhopadhyay, P.; Banerjee, S.

    1999-02-19

    In the work reported here, the microstructural features associated with the active eutectoid decomposition of a near eutectoid alloy (Zr-3 wt.%Fe) on {beta} quenching were examined. The effects of aging after {beta} quenching, and of furnace cooling from the {beta} phase field, on the microstructure of the alloy were also studied. The microstructural characterization was carried out using optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM). The room temperature mechanical properties corresponding to some of the microstructures were evaluated by mechanical testing.

  9. Mechanistic investigation of vinylic carbonfluorine bond activation of perfluorinated cycloalkenes using Cp*2ZrH2 and Cp*2ZrHF

    E-Print Network [OSTI]

    Jones, William D.

    using Cp*2ZrH2 and Cp*2ZrHF Bradley M. Kraft a , Eric Clot b , Odile Eisenstein b , William W behaves similarly [4]. In contrast, Cp*Rh(PMe3)H2 reacts with C6F6 by way of an SNAr2 attack by its conjugate base to give Cp*Rh(PMe3)(C6F5)H and fluoride ion, resulting in an autocatalytic reaction [5]. Cp

  10. Displacive radiation-induced structural contraction in nanocrystalline ZrN

    SciTech Connect (OSTI)

    Lu Fengyuan; Sun Hongtao; Lian Jie [Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytech Institute, Troy, New York 12180 (United States); Huang, Mengbing; Yaqoob, Faisal [Ion Beam Laboratory, University at Albany-SUNY, Albany, New York 12222 (United States); Lang, Maik; Ewing, Rodney C. [Departments of Earth and Environmental Sciences and Materials Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109-1005 (United States); Namavar, Fereydoon [Department of Orthopaedic Surgery and Rehabilitation, University of Nebraska Medical Center, Omaha, Nebraska 68198 (United States); Trautmann, Christina [GSI Helmholtz Center for Heavy Ion Research, 64291 Darmstadt (Germany); Technische Universitaet Darmstadt, 64289 Darmstadt (Germany)

    2012-07-23

    Nanocrystalline ZrN thin films with 5 nm grain size, prepared by ion beam assisted deposition, maintained their isometric structure upon intensive displacive and ionizing irradiations, indicating an extremely high stability similar to bulk ZrN. However, a unique structural contraction up to 1.42% in lattice parameter occurred only in nano-sized ZrN upon displacive irradiations. A significant nitrogen loss occurred with reduced N:Zr atomic ratio to 0.88, probably due to the production of displaced nitrogen atoms and fast diffusion along grain boundaries in nanocrystalline ZrN matrix. The accumulation of nitrogen vacancies and related strain relaxation may be responsible for the structural contraction.

  11. Effect of surface strain on oxygen adsorption on Zr (0001) surface

    SciTech Connect (OSTI)

    Wang, Xing [Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics; Khafizov, Marat [Idaho National Laboratory (INL), Idaho Falls, ID (United States); Szlufarska, Izabela [Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics; Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Materials Science and Engineering

    2014-02-01

    The effect of surface strain on oxygen adsorption on Zr (0 0 0 1) surface is investigated by density functional theory (DFT) calculations. It is demonstrated that both surface strain and interactions between oxygen adsorbates influence the adsorption process. Oxygen binding to zirconium becomes stronger as the strain changes from compressive to tensile. When oxygen coverage is low and the oxygen interactions are negligible, surface face-centered cubic sites are the most stable for O binding. At high coverage and under compression, octahedral sites between second and third Zr layers become most favorable because the interactions between adsorbates are weakened by positive charge screening. Calculations with both single-layer adsorption model and multiple-layer adsorption model demonstrate that compressive strain at the Zr/oxide interface will provide a thermodynamic driving force for oxygen to incorporate from the surface into the bulk of Zr, while binding oxygen to the Zr surface will be easier when tensile strain is applied.

  12. PROGRAM GUIDE BA IN EDUCATION SPECIALIZATION IN EARLY CHILDHOOD EDUCATION

    E-Print Network [OSTI]

    Rusu, Adrian

    PROGRAM GUIDE BA IN EDUCATION ­ SPECIALIZATION IN EARLY CHILDHOOD EDUCATION I. Benchmark Point 1 Communities II: Early Childhood (TLCII), and Educational Technology. G. Ratings of "Meets Expectations: Early Childhood, Educational Technology, Growth and Learning: Birth ­ 5 years, Language Development

  13. Symmetry-Breaking Orbital Anisotropy Observed for Detwinned Ba...

    Office of Scientific and Technical Information (OSTI)

    Observed for Detwinned Ba(Fe (1-X) Co (X) ) (2) As (2) Above the Spin Density Wave Transition Citation Details In-Document Search Title: Symmetry-Breaking Orbital...

  14. Economics, Quantitative Emphasis BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Economics, Quantitative Emphasis BA, 2015-2016 Name ID# Date Course Number and Title Credits Quantitative Methods in Economics 3 FF ECON 422 Econometrics 3 Upper-division economics courses 16 MATH 175

  15. 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

    2012-04-10

    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.

  16. Leptonic B Decays at BaBar

    SciTech Connect (OSTI)

    Monorchio, Diego; /INFN, Naples /Naples U.

    2011-09-13

    The authors will present the most recent results on leptonic B decays B{sup {+-}(0)} {yields} K*{sup {+-}(0)} {nu}{bar {nu}} and B{sup {+-}} {yields} {mu}{sup {+-}}{nu}, based on the data collected by the BaBar detector at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Rare B decays have always been a standard probe for New Physics (NP) searches. The very low Standard Model (SM) rate of these decays often make them unaccessible with the present experimental datasets, unless NP effects enhance the rate up to the current experimental sensitivity. Moreover, as NP effects can modify the decay kinematic, particular attention must be payed in order to perform a model independent analysis. A B-Factory provides an unique environment where to investigate these processes. The high number of B{bar B} pairs produced by a B-Factory often allows to approach the needed experimental sensitivity. Moreover, the clean environment and the closed kinematic of the initial state enable to obtaining a very pure sample where to look for these decays.

  17. Leptonic B Decays at BaBar

    SciTech Connect (OSTI)

    Baracchini, Elisabetta; /Rome U. /INFN, Rome

    2011-11-10

    We will present the most recent results on leptonic B decays B{sup {+-}(0)} {yields} K*{sup {+-}(0)}{nu}{bar {nu}} and B{sup {+-}} {yields} {mu}{sup {+-}}{nu}, based on the data collected by the BaBar detector at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Rare B decays have always been a standard probe for New Physics (NP) searches. The very low Standard Model (SM) rate of these decays often make them unaccessible with the present experimental datasets, unless NP effects enhance the rate up to the current experimental sensitivity. Moreover, as NP effects can modify the decay kinematic, particular attention must be paid in order to perform a model independent analysis. A B-Factory provides an unique environment to investigate these processes. The high number of B{bar B} pairs produced by a B-Factory often allows to approach the needed experimental sensitivity. Moreover, the clean environment and the closed kinematic of the initial state enable to obtaining a very pure sample where to look for these decays.

  18. The Department of Energy's Transportation Electrification Program, 0AS-RA-12-11

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11Renewable

  19. Direct spectroscopic evidence for completely filled Cu 3d shell in BaCu?As? and ? – BaCu?Sb?

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

    Wu, S. F.; Richard, P.; van Roekeghem, A.; Nie, S. M.; Miao, H.; Xu, N.; Qian, T.; Saparov, B.; Fang, Z.; Biermann, S.; et al

    2015-06-08

    We use angle-resolved photoemission spectroscopy to extract the band dispersion and the Fermi surface of BaCu?As? and ? - BaCu?Sb?. While the Cu 3d bands in both materials are located around 3.5 eV below the Fermi level, the low-energy photoemission intensity mainly comes from As 4p states, suggesting a completely filled Cu 3d shell. The splitting of the As 3d core levels and the lack of pronounced three-dimensionality in the measured band structure of BaCu?As? indicate a surface state likely induced by the cleavage of this material in the collapsed tetragonal phase, which is consistent with our observation of amore »Cu?¹ oxidation state. However, the observation of Cu states at similar energy in ? - BaCu?Sb? without the pnictide-pnictide interlayer bonding characteristic of the collapsed tetragonal phase suggests that the short interlayer distance in BaCu?As? follows from the stability of the Cu?¹ rather than the other way around. Our results confirm the prediction that BaCu?As? is an sp metal with weak electronic correlations.« less

  20. Plant cyclopeptide RA-V kills human breast cancer cells by inducing mitochondria-mediated apoptosis through blocking PDK1–AKT interaction

    SciTech Connect (OSTI)

    Fang, Xian-Ying; Chen, Wei; Fan, Jun-Ting; Song, Ran; Wang, Lu; Gu, Yan-Hong; Zeng, Guang-Zhi; Shen, Yan; Wu, Xue-Feng; Tan, Ning-Hua; Xu, Qiang; Sun, Yang

    2013-02-15

    In the present paper, we examined the effects of a natural cyclopeptide RA-V on human breast cancer cells and the underlying mechanisms. RA-V significantly inhibited the growth of human breast cancer MCF-7, MDA-MB-231 cells and murine breast cancer 4T1 cells. In addition, RA-V triggered mitochondrial apoptotic pathway which was indicated by the loss of mitochondrial membrane potential, the release of cytochrome c, and the activation of caspase cascade. Further study showed that RA-V dramatically inhibited phosphorylation of AKT and 3-phosphoinositide dependent protein kinase 1 (PDK1) in MCF-7 cells. Moreover, RA-V disrupted the interaction between PDK1 and AKT in MCF-7 cells. Furthermore, RA-V-induced apoptosis could be enhanced by phosphatidylinositol 3-kinase inhibitor or attenuated by over-expression of AKT in all the three kinds of breast cancer cells. Taken together, this study shows that RA-V, which can induce mitochondria-mediated apoptosis, exerts strong anti-tumor activity against human breast cancer. The underlying anti-cancer mechanism of RA-V is related to the blockage of the interaction between PDK1 and AKT. - Highlights: ? Plant cyclopeptide RA-V kills human breast cancer cells. ? RA-V triggered mitochondrial apoptotic pathway in human breast cancer cells. ? RA-V inhibited phosphorylation of AKT and PDK1 in breast cancer MCF-7 cells. ? Its mechanism is related to the blockage of the interaction between PDK1 and AKT.

  1. Molecular Evolution, Networks in From: Meyers, R.A. (ed.) Encyclopedia of Complexity and System Science. Springer, Heidelberg

    E-Print Network [OSTI]

    Wagner, Andreas

    Molecular Evolution, Networks in From: Meyers, R.A. (ed.) Encyclopedia of Complexity and System of Biochemistry Computational Biology and Bioinformatics Building Y27 Winterthurerstrasse 190 CH-8057 Zurich

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

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

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

    2015-06-23

    The structures and magnetic properties of Co-Zr-B alloys near the composition of Co5Zr with B at. % ?6% were studied using adaptive genetic algorithm and first-principles calculations. The energy and magnetic moment contour maps as a function of chemical composition were constructed for the Co-Zr-B magnet alloys through extensive structure searches and calculations. We found that Co-Zr-B system exhibits the same structure motif as the “Co11Zr2”polymorphs, and such motif plays a key role in achieving strong magnetic anisotropy. Boronatoms were found to be able to substitute cobalt atoms or occupy the “interruption” sites. First-principles calculations showed that the magnetocrystalline anisotropymore »energies of the boron-doped alloys are close to that of the high-temperature rhombohedral Co5Zr phase and larger than that of the low-temperature Co5.25Zr phase. Our calculations provide useful guidelines for further experimental optimization of the magnetic performances of these alloys.« less

  3. 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)

    2014-03-24

    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.

  4. 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

    2015-01-01

    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.

  5. Structural relaxation and nanoindentation response in Zr-Cu-Ti amorphous thin films

    SciTech Connect (OSTI)

    Chou, H. S.; Huang, J. C.; Chang, L. W. [Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Nieh, T. G. [Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)

    2008-11-10

    Ternary Zr-Cu-Ti system, especial with a high Ti content, is normally difficult to be fully vitrified. In this paper, we demonstrate that cosputtering can produce amorphous Zr-Cu-Ti thin films with an excessive Ti content even as high as 19%. Sub-T{sub g} annealing of the film induces the formation of medium-range-ordered clusters and to raise the nanohardness by 35% to 6.6 GPa. The promising mechanical properties of the sub-T{sub g} annealed Zr{sub 52}Cu{sub 29}Ti{sub 19} films offer great potential for microelectromechanical system applications.

  6. Quantitative phase analysis of Mg:ZrO{sub 2} nanoparticles by Rietveld refinement method

    SciTech Connect (OSTI)

    Balaji, V. Senthilkumaran, S. Thangadurai, P.

    2014-04-24

    To quantify the structural phases of nanocrystalline ZrO{sub 2} doped with Mg ions of varying concentrations (3, 5, 10, 15 and 20%) and annealed at different temperatures. Magnesia doped zirconia was prepared by chemical co-precipitation method and annealed up to 1000°C. The monoclinic and tetragonal phases present in Mg:ZrO{sub 2} were quantified using Rietveld refinement analysis of the X-ray diffraction data and compared with the Direct method based on peak intensity calculations. Tetragonal phase was dominant in the 600°C annealed Mg:ZrO{sub 2} for all Mg concentrations.

  7. 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.

    1980-01-01

    the AEr gate alone was able to remove essentially all unwanted events, the E' and TOF gates were maintained for additional discrim- ination. Two sets of these gates could be set to collect data in different exit channels. Three 2048 channel position... parameters. Nucleus (MeV) (MeV) W (Me V) t'p (fm) Qp (fm) &c Data angle range ~zr ?6Sn 96 129 45.7 60.8 27.7 40.9 1.50 1.40 0.70 0.73 1.30 1.35 (9'-57') (12'-50') TABLE III. Param. eters of the GMR and GQR. The er- rors...

  8. Pygmy dipole resonance and dipole polarizability in {sup 90}Zr

    SciTech Connect (OSTI)

    Iwamoto, C.; Tamii, A.; Shima, T.; Hashimoto, T.; Suzuki, T.; Fujita, H.; Hatanaka, K. [Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047 (Japan); Utsunomiya, H.; Akimune, H.; Yamagata, T.; Okamoto, A.; Kondo, T. [Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501 (Japan); Nakada, H. [Department of Physics, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage, Chiba 263-8522 (Japan); Kawabata, T. [Department of Physics, Kyoto University, Kyoto 606-8502 (Japan); Fujita, Y. [Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043 (Japan); Matsubara, H. [RIKEN Nishina Center, Wako, Saitama 351-0198 (Japan); Shimbara, Y.; Nagashima, M. [Department of Physics, Niigata University, Niigata 950-21-2 (Japan); Sakuda, M.; Mori, T. [Department of Physics, Okayama University, Okayama 900-0082 (Japan); and others

    2014-05-02

    Electric dipole (E1) reduced transition probability B(E1) of {sup 90}Zr was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El Coulomb excitation, and the E1 strength of the pygmy dipole resonance was found in the vicinity of the neutron threshold in the low-energy tail of the giant dipole resonance. Using the data, we plan to determine the precise dipole polarizability ?{sub D} which is defined as an inversely energy-weighted sum value of the elecrric dipole strength. The dipole polarizability is expected to constrain the symmetry energy term of the neutron matter equation of state. Thus systematical measurement of the dipole polarizability is important.

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

    DOE Patents [OSTI]

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

    1990-11-20

    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.

  10. 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)

    2014-01-28

    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.

  11. Analysis of the electronic structure of ZrO{sub 2} by Compton spectroscopy

    SciTech Connect (OSTI)

    Mahammad, F. M.; Mahammed, S. F. [University of Tikrit 42, Department of Physics (Iraq)] [University of Tikrit 42, Department of Physics (Iraq); Kumar, R.; Vijay, Y. K.; Sharma, B. K. [University of Rajasthan, Department of Physics (India)] [University of Rajasthan, Department of Physics (India); Sharma, G., E-mail: gsphysics@gmail.com [University of Kota, Department of Pure and Applied Physics (India)

    2013-07-15

    The electronic structure of ZrO{sub 2} is studied using the Compton scattering technique. The first-ever Compton profile measurement on polycrystalline ZrO{sub 2} was obtained using 59.54 keV gamma-rays emanating from the {sup 241}Am radioisotope. To explain the experimental data, we compute theoretical Compton profile values using the method of linear combination of atomic orbitals in the framework of density functional theory. The correlation scheme proposed by Perdew-Burke-Ernzerhof and the exchange scheme of Becke are considered. The ionic-model-based calculations for a number of configurations, i.e., Zr{sup +x}(O{sup -x/2}){sub 2} (0 {<=} x {<=} 2), are also performed to estimate the charge transfer on compound formation, and the study supports transfer of 1.5 electrons from Zr to O atoms.

  12. Oxidation induced amorphous stabilization of the subsurface region in Zr-Cu metallic glass

    SciTech Connect (OSTI)

    Lim, K. R. [Light Metal Division, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 642-831 (Korea, Republic of); Park, J. M. [Materials Research Center, Samsung Advanced Institute of Technology (SAIT) San 14-1, Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-712 (Korea, Republic of); Park, S. H.; Na, M. Y.; Kim, K. C.; Kim, D. H., E-mail: dohkim@yonsei.ac.kr [Department of Materials Science and Engineering, Center for Non-crystalline Materials, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea, Republic of); Kim, W. T. [Department of Optical Engineering, Cheongju University, 36 Naedock-dong, Cheongju 360-764 (Korea, Republic of)

    2014-01-20

    In the present study, we demonstrate that selective surface oxidation of Zr{sub 70}Cu{sub 30} metallic glass can stabilize the amorphous structure in the subsurface region of the matrix. The oxidation proceeds by selective oxidation of Zr, forming monoclinic ZrO{sub 2} layer on the surface, and the subsurface layer becomes Cu-enriched due to back diffusion of Cu atoms from the oxide layer. Interestingly, in this system, the composition change in the subsurface region leads to enhancement of glass stability, forming of a double layered surface structure consisted of inner amorphous layer and outer monoclinic ZrO{sub 2} layer even when the remaining matrix is completely crystallized.

  13. The Structural Role of Zr within Alkali Borosilicate Glasses for Nuclear Waste Immobilisation

    SciTech Connect (OSTI)

    A Connelly; N Hyatt; K Travis; R Hand; E Maddrell; R Short

    2011-12-31

    Zirconium is a key constituent element of High Level nuclear Waste (HLW) glasses, occurring both as a fission product and a fuel cladding component. As part of a wider research program aimed at optimizing the solubility of zirconium in HLW glasses, we have investigated the structural chemistry of zirconium in such materials using X-ray Absorption Spectroscopy (XAS). Zirconium K-edge XAS data were acquired from several inactive simulant and simplified waste glass compositions, including a specimen of blended Magnox/UO{sub 2} fuel waste glass. These data demonstrate that zirconium is immobilized as (octahedral) six-fold coordinate ZrO{sub 6} species in these glasses, with a Zr-O contact distance of 2.09 {angstrom}. The next nearest neighbors of the Zr species are Si at 3.42 {angstrom} and possibly Na at 3.44 {angstrom}, no next nearest neighbor Zr could be resolved.

  14. Glass Forming Ability and Relaxation Behavior of Zr Based Metallic Glasses 

    E-Print Network [OSTI]

    Kamath, Aravind Miyar

    2012-07-16

    was studied by using thermal techniques to determine important GFA indicators for Zr-based bulk metallic glasses (BMG). The effect of alloying elements, annealing temperature and annealing time on the thermal and structural relaxation of the BMGs was studied...

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

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

    a meso-scale, microstructural evolution model for simulation of zirconium hydride precipitation in the cladding of used fuels during long-term dry-storage. While the Zr-based...

  16. Observation of excited states in /sup 128/Ba

    SciTech Connect (OSTI)

    Zhao Zhi-zheng; Guo Ying-xiang; Pan Zong-you; Xiao Jian-min; Lei Xiang-guo; Liu Hong-ye; Sun Xi-jun

    1987-01-01

    Excited states in /sup 128/Ba have been investigated via the /sup 120/Sn (/sup 12/C, 4n..gamma..) /sup 128/Ba reaction by means of in-beam gamma spectroscopy. A 12/sup +/ state other than the previously reported one is observed according to the properties of the 935.0 keV ..gamma..-ray. It does not belong to the ground-state band. Two new interband transitions, 224.8 keV and 632.7 keV, are observed and assigned to sidefeeding between the negative-parity band and ground-state band.

  17. Evolution of ordered {omega} phases in (Zr{sub 3}Al)-Nb alloys

    SciTech Connect (OSTI)

    Tewari, R.; Mukhopadhyay, P.; Banerjee, S.; Bendersky, L.A.

    1999-03-10

    Microstructural investigations on rapidly solidified Zr{sub 3}Al based alloys (binary Zr{sub 3}Al and ternary Zr{sub 3}Al-3Nb and Zr{sub 3}Al-10Nb) have revealed some unusual phase transformation sequences. The Zr{sub 5}Al{sub 3} phase (D8{sub 8} structure) has been found to occur in both the rapidly solidified ternary alloys unlike in the rapidly solidified stoichiometric Zr{sub 3}Al alloy in which the ZrAl phase (B8{sub 2} structure) has been found to be present. The evolution of the D8{sub 8} phase, which could be regarded as one of the ordered derivatives of the {omega} phase, could be described in terms of a superimposition of replacive and displacive ordering waves in the {beta} phase. The orientation relationship between the {beta} and the D8{sub 8} phases has been established. The microstructural changes occurring in the rapidly solidified Zr{sub 3}Al-Nb alloys during aging have been examined. It has been found that on aging the D8{sub 8} phase gets transformed into the B8{sub 2} phase which, on continued aging, transforms to other metastable and equilibrium phases, depending upon the aging temperature. The observed sequence of phase transformations involving different structurally related phases has been along the direction of progressively close packed structures. The symmetry changes associated with the sequence of {omega} related transformations have been summarized in the form of a symmetry tree.

  18. Examination Report: OAS-RA-13-01 | 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirley Ann Jackson About1996 EM HealthCybersecurityExamination Report: OAS-RA-13-01 Examination

  19. Examination Report: OAS-RA-13-02 | 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirley Ann Jackson About1996 EM HealthCybersecurityExamination Report: OAS-RA-13-01

  20. 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 on Delicious Rank EERE:FinancingPetroleum Based Fuels Research atDepartmentAudits and6 Audit Report:84 Audit10RA-L-12-06

  1. Inspection Report: INS-RA-12-01 | 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 on Delicious RankADVANCED MANUFACTURING OFFICE INDUSTRIAL TECHNICAL8-02 Inspection Report: INS-O-98-02 April 2,RA-12-01

  2. Special Report: OAS-RA-10-01 | Department of Energy

    Energy Savers [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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OF APPLICABLE DIRECTIVESDepartmentSpecial Report: OAS-RA-10-01 Special Report:

  3. Voorkennis chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb.etterbeek@vub.ac.be

    E-Print Network [OSTI]

    Einmahl, Uwe

    Voorkennis chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb verwachte voorkennis, telkens geïllustreerd met een of meerdere voorbeeldopgaven. 1. Elementaire chemie en chemische reacties #12;Voorkennis chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb

  4. Voorkennis chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb.etterbeek@vub.ac.be

    E-Print Network [OSTI]

    Einmahl, Uwe

    Voorkennis chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb verwachte voorkennis, telkens geïllustreerd met een of meerdere voorbeeldopgaven. 1. Elementaire chemie en chemische reacties #12;Voorkennis chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb

  5. Optimizing Parallel Access to the BaBar Database System Using...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: Optimizing Parallel Access to the BaBar Database System Using CORBA Servers Citation Details In-Document Search Title: Optimizing Parallel Access to the BaBar...

  6. The Acquisition of the BA Construction by English-speaking Learners of Chinese

    E-Print Network [OSTI]

    Xu, Hongying

    2012-08-31

    This study examined the acquisition of the BA construction by English-speaking learners of Chinese. The BA construction is a unique yet important grammar phenomenon in Chinese. Whether second language (L2) learners of Chinese are able to understand...

  7. BaTiO? based materials for piezoelectric and electro-optic applications

    E-Print Network [OSTI]

    Avrahami, Ytshak, 1969-

    2003-01-01

    Ferroelectric materials are key to many modem technologies, in particular piezoelectric actuators and electro-optic modulators. BaTiO? is one of the most extensively studied ferroelectric materials. The use of BaTiO? for ...

  8. Development of a new casting method to fabricate U–Zr alloy containing minor actinides

    SciTech Connect (OSTI)

    Jong Hwan Kim; Hoon Song; Hyung Tae Kim; Ki Hwan Kim; Chan Bock Lee; R. S. Fielding

    2014-01-01

    Metal fuel slugs of U–Zr alloys for a sodium-cooled fast reactor (SFR) have conventionally been fabricated using an injection casting method. However, casting alloys containing volatile radioactive constituents, such as Am, are problematic in a conventional injection casting method. As an alternative fabrication method, low pressure gravity casting has been developed. Casting soundness, microstructural characteristics, alloying composition, density, and fuel losses were evaluated for the following as-cast fuel slugs: U–10 wt% Zr, U–10 wt% Zr–5 wt% RE, and U–10 wt% Zr–5 wt% RE–5 wt% Mn. The U and Zr contents were uniform throughout the matrix, and impurities such as oxyen, carbon, and nitrogen satisfied the specification of total impurities less than 2,000 ppm. The appearance of the fuel slugs was generally sound, and the internal integrity was shown to be satisfactory based on gamma-ray radiography. In a volatile surrogate casting test, the U–Zr–RE–Mn fuel slug showed that nearly all of the manganese was retained when casting was done under an inert atmosphere.

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

    SciTech Connect (OSTI)

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

    2005-06-01

    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.

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

    SciTech Connect (OSTI)

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

    2005-06-01

    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.

  11. 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

    2015-01-01

    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.

  12. Dielectric properties of Ba{sub 3-x}K{sub x}CaNb{sub 2}O{sub 9-{delta}} (0.5 < x < 1.25) (KBCN) double perovskites

    SciTech Connect (OSTI)

    Bhella, Surinderjit Singh; Thangadurai, Venkataraman

    2011-05-15

    Graphical abstract: Electrical conductivity, dielectric constant and dielectric loss of Ba{sub 1.75}K{sub 1.25}CaNb{sub 2}O{sub 9-{delta}} in air at 400-700 {sup o}C. Research highlights: {yields} We show the effectiveness of AC impedance spectroscopy to screen dielectric materials and to understand contributing effects on the dielectric properties of polycrystalline metal oxides. {yields} Unlike Ba{sub 3}CaNb{sub 2}O{sub 9}, Ba{sub 3-x}K{sub x}CaNb{sub 2}O{sub 9-{delta}} exhibits negligible grain-boundary and electrode effects to the total electrical properties and is consistent with perovskite-type K-doped BaZrO{sub 3}. {yields} Among the samples investigated, Ba{sub 1.75}K{sub 1.25}CaNb{sub 2}O{sub 9-{delta}} sintered at 1100 {sup o}C showed the highest dielectric constant of 65 at 10{sup 6} Hz and dielectric loss of 0.14 at 400 {sup o}C in air. -- Abstract: We report synthesis, structure and dielectric properties of double perovskite-type Ba{sub 3-x}K{sub x}CaNb{sub 2}O{sub 9-{delta}} (x = 0.5, 0.75, 1, 1.25) (KBCN). Powder X-ray diffraction (XRD) confirmed the formation of double perovskite-type structure and lattice constant decreases with increasing K in KBCN. AC impedance study showed a single semicircle over the investigated temperatures and frequencies in dry H{sub 2}, H{sub 2} + 3% H{sub 2}O, 3% H{sub 2}O + N{sub 2}, while two semicircles were observed at low temperatures in air, which could be attributed to bulk and grain-boundary contributions. Unlike un-doped BCN, KBCN exhibits negligible grain-boundary and electrode effects to the total electrical properties and is consistent with perovskite-type K-doped BaZrO{sub 3}. The bulk dielectric constant and dielectric loss were found to increase with increasing K content in KBCN and also found to change with sintering temperature. Among the samples investigated, Ba{sub 1.75}K{sub 1.25}CaNb{sub 2}O{sub 9-{delta}} sintered at 1100 {sup o}C showed the highest dielectric constant of 65 at 10{sup 6} Hz and dielectric loss of 0.14 at 400 {sup o}C in air. Isothermal dielectric constant and electrical conductivity at 1 MHz were found to be independent at elevated temperatures, while vary at low-frequency and low temperatures. Below 700 {sup o}C, dielectric constant and dielectric loss decreases with increasing frequency, whereas an opposite trend was observed for the electrical conductivity.

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

    SciTech Connect (OSTI)

    Szanyi, Janos; Kwak, Ja Hun; Kim, Do Heui; Wang, Xianqin; Hanson, Jonathan; Chimentao, Ricardo J.; Peden, Charles HF

    2007-03-07

    Exposure of NO2-saturated BaO/?-Al2O3 NOx storage materials to H2O vapour results in the conversion of surface nitrates to Ba(NO3)2 crystallites, causing dramatic morphological changes in the Ba-containing phase, demonstrating a role for water in affecting the NOx storage/reduction properties of these materials.

  14. Information on the impact parameter dependence of the Ba + HI ---+ Bal(v = 8) + H reaction

    E-Print Network [OSTI]

    Zare, Richard N.

    velocity dependence of the reaction channel studied. Ifthe reaction probability is the same for allInformation on the impact parameter dependence of the Ba + HI ---+ Bal(v = 8) + H reaction Chifuru measured for the beam-gas reaction Ba + HI ---+ BaI(v = 8) + H. Owing to the highly constrained kinematics

  15. Comparative Analysis Of {sup 226}Ra Soil-To-Plant Transfer In Cabbage Grown In Various Regions

    SciTech Connect (OSTI)

    Madruga, M. J.; Carvalho, F. P.; Silva, L.; Gouveia, J. [Nuclear and Technological Institute/Department of Radiological Protection and Nuclear Safety E.N. 10, 2686-953 Sacavem (Portugal)

    2008-08-07

    The transfer of {sup 226}Ra from soil to cabbage was compared amongst regions, namely the surroundings of Urgeirica uranium milling tailings (GE), regions with past uranium mining activities (GN1), and regions with no uranium mining activities and no uranium deposits (GN2). Results show a slight increase of the concentration ratio values at low radium concentration in soils. Statistical analysis of the mean {sup 226}Ra activity concentrations in soil and cabbage for the three regions was carried out. The comparison of {sup 226}Ra activity concentrations in soils indicated no difference (p>0.05), between GE and GN2 and significant differences (p<0.05) between GE and GN1 and between GN1 and GN2. Similar statistical results were obtained for {sup 226}Ra activity concentrations in cabbage from the same regions. It was concluded that radium Concentration Ratio (CR) for cabbage grown in the region of the main uranium milling site (GE) is of the same order of magnitude of CR in cabagge grown in background regions (GN2). However, {sup 226}Ra CR was higher in cabagge from the region with past uranium mining activities (GN1)

  16. 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

    2008-01-29

    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.

  17. ENVIRONMENTAL SCIENCE & POLICY. BA Academic year 2014-2015

    E-Print Network [OSTI]

    1 ENVIRONMENTAL SCIENCE & POLICY. BA Academic year 2014-2015 College: Arts and Sciences Degree: B Environmental Science is the interdisciplinary study of environmental systems from a scientific perspective. Drawing principally from the areas of oceanography, geology, and meteorology, the Environmental Science

  18. FOUR YEAR B.A. DEGREE IN PHYSICS SAMPLE CURRICULUM

    E-Print Network [OSTI]

    Olszewski Jr., Edward A.

    FOUR YEAR B.A. DEGREE IN PHYSICS SAMPLE CURRICULUM FRESHMAN YEAR Fall Semester CH Spring Semester IN PHYSICS SAMPLE CURRICULUM FRESHMAN YEAR Fall Semester CH Spring Semester CH CHM 101 4 CHM 102 4 ENG 101 3 SAMPLE CURRICULUM YEAR ONE Fall Semester CH Spring Semester CH ENG 101 3 MAT 112 3 MAT 110 OR MAT 111 3

  19. History BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    History BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed InProgress Future Government (recommended) 3 DLS Social Sciences course in a second field other than history 3 One year of college level foreign language in sequence Language equivalency required by the history department

  20. History, Secondary Education BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    History, Secondary Education BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed equivalency required by the history department will be determined by the department of modern languages or the history department. 8 HIST 111/211 United States History 3 HIST 112/212 United States History 3 CID HIST

  1. MAJOR TO CAREER GUIDE B.A. Mathematics

    E-Print Network [OSTI]

    Walker, Lawrence R.

    MAJOR TO CAREER GUIDE B.A. Mathematics College of Sciences math.unlv.edu/ Mission of the College of Sciences The College of Sciences offers programs in life sciences, chemistry, geoscience, mathematical: MPE-A 130 www.unlv.edu/sciences/advising About the Mathematics Degree Mathematics is a powerful tool

  2. Structural phase transitions in BaPrO{sub 3}

    SciTech Connect (OSTI)

    Saines, Paul J.; Kennedy, Brendan J. Smith, Ronald I.

    2009-04-02

    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.

  3. 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

  4. 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

  5. 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

  6. 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

  7. BaBar Note 295 May 16th, 1996

    E-Print Network [OSTI]

    the heat exchange. Note the 2 HDIs on each pair of feet. between water and cooling walls has been made generated on the hybrid. We have realized that lateral walls of the channel help the heat exchange between and cooling system. Three types of hybrid will be used in BaBar SVT, di ering in the number of chips from 10

  8. Visual Art BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Visual Art BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed InProgress Future Survey of Western Art I 3 DLL Literature and Humanities 3-4 DLS Social Sciences course in a first field 3 DLS Social Sciences course in a second field 3 ART 107, 108 Art Foundations I and II 6 ART 109

  9. BA: Art (Liberal Arts) Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    BA: Art (Liberal Arts) Fall--First Year ART 127 New Major Seminar ART 101 Art Studio Foundations I Liberal Studies Program (LSP) coursework Fall--Second Year ART 190 Foundations Proficiency Review Major Studio I ART 222, 223, or 224 (Art History) Liberal Studies Program (LSP) coursework Fall

  10. 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, you will study the theory and ethics of journalism in a rapidly changing technological landscape

  11. Combined Honours BA Digital Journalism and Political Science

    E-Print Network [OSTI]

    Combined Honours BA Digital Journalism and Political Science Are you looking for a career combining-set? If so, the Combined Honours program in Digital Journalism and Political Science is for you. www in mainstream and alternative journalism, as well in as such fields as communications for business, government

  12. Communication Disorders: BA/BS Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    : The Speech Mechanism · CMDS 472: Audiology · Liberal Studies Program (LSP) coursework Fall--Fourth Year Program (LSP) coursework Spring--Fourth Year · CMDS 480: Clinical Practice (if not taken fall--fourth yearCommunication Disorders: BA/BS Fall--First Year · CMDS 200: Intro to Comm. Disorders · CMDS 101

  13. Music BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Music BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed In Progress Future ENGL Introduction to Music 3 DLL Literature and Humanities 3-4 DLS Social Sciences course in a first field 3 DLS Social Sciences course in a second field 3 MUS 119, 120, 219, 220 Materials of Music 12 MUS 121, 122 221

  14. Music BA Liberal Arts Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    Music ­ BA Liberal Arts Fall--First Year MUSI 130: Music Analysis I MUSI 132: Aural Skills in Music I MUSI 279: Concert and Recital Atten. MUSI 153: Keyboard Skills I Major Applied Area Major Ensemble Liberal Studies Program (LSP) coursework Fall--Second Year MUSI 230: Music Analysis III MUSI

  15. Communication BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Communication BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed In and Performing Arts 3 DLL Literature and Humanities 3-4 DLS COMM 101 Fundamentals of Communication 3 DLS Social Sciences course in a second field 3 Communication Arts - choose one from the following: COMM 131, COMM 211

  16. College of Arts & Sciences Communication, B.A.

    E-Print Network [OSTI]

    New Mexico, University of

    05/15/2008 College of Arts & Sciences Communication, B.A. Broad Learning Outcomes A. Design, coherent, cogent manner. C. Understand and appreciate culturally diverse ways of communicating. D. Critically analyze communication situations and messages from multiple theoretical perspectives. E

  17. B.A. DEGREE REQUIREMENTS FOR CHEMISTRY (BIOLOGICAL CHEMISTRY TRACK)

    E-Print Network [OSTI]

    Doyle, Robert

    B.A. DEGREE REQUIREMENTS FOR CHEMISTRY (BIOLOGICAL CHEMISTRY TRACK) Requirements include 21 credits from chemistry core courses, 6 credits from the list, (2) below, of approved biology/biochemistry core's course of study must include the following: 1.) Required Chemistry Core Courses CHE 106: General

  18. 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

  19. B.A. DEGREE REQUIREMENTS FOR CHEMISTRY (CHEMISTRY TRACK)

    E-Print Network [OSTI]

    Doyle, Robert

    B.A. DEGREE REQUIREMENTS FOR CHEMISTRY (CHEMISTRY TRACK) Requirements include 36 credits in chemistry core courses, 32 of which are taken in specific courses. Each student's course of study includes the following: 1.) Required Chemistry Core Courses CHE 106: General Chemistry Lecture I (3) CHE 116: General

  20. Economics BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Economics BA, 2015-2016 Name ID# Date Course Number and Title Credits Completed InProgress Future Intermediate Macroeconomics 3 CID ECON 421 Quantitative Methods in Economics 3 FF ECON 422 Econometrics 3 Upper-division economics courses 15 Upper-division mathematics, business, or environmental studies courses or social

  1. 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.; Ahn, C. H.

    2014-02-10

    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.

  2. Bio-corrosion and cytotoxicity studies on novel Zr55Co30Ti15 and Cu60Zr20Ti20 metallic glasses

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

    Vincent, S.; Daiwile, A.; Devi, S. S.; Kramer, M. J.; Besser, M. F.; Murty, B. S.; Bhatt, Jatin

    2014-09-26

    Metallic glasses are a potential and compatible implant candidate for biomedical applications. In the present investigation, a comparative study between novel Zr55Co30Ti15 and Cu60Zr20Ti20 metallic glasses is carried out to evaluate in vitro biocompatibility using simulated body fluids. The bio-corrosion behavior of Zr- and Cu-based metallic glasses in different types of artificial body fluids such as artificial saliva solution, phosphate-buffered saline solution, artificial blood plasma solution, and Hank’s balanced saline solution is evaluated using potentiodynamic polarization studies at a constant body temperature of 310.15 K (37 °C). Surface morphology of samples after bio-corrosion experiments was observed by scanning electron microscopy.more »In vitro cytotoxicity test on glassy alloys were performed using human osteosarcoma cell line as per 10993-5 guidelines from International Organization for Standardization. As a result, the comparative study between Zr- and Cu-based glassy alloys provides vital information about the effect of elemental composition on biocompatibility of metallic glasses.« less

  3. 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.; et al

    2015-05-06

    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.more »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.« less

  4. Experimental constraints on the $?$-ray strength function in $^{90}$Zr using partial cross sections of the $^{89}$Y(p,$?$)$^{90}$Zr reaction

    E-Print Network [OSTI]

    L. Netterdon; A. Endres; S. Goriely; J. Mayer; P. Scholz; M. Spieker; A. Zilges

    2015-04-20

    Partial cross sections of the $^{89}$Y(p,$\\gamma$)$^{90}$Zr reaction have been measured to investigate the $\\gamma$-ray strength function in the neutron-magic nucleus $^{90}$Zr. For five proton energies between $E_p=3.65$ MeV and $E_p=4.70$ MeV, partial cross sections for the population of seven discrete states in $^{90}$Zr have been determined by means of in-beam $\\gamma$-ray spectroscopy. Since these $\\gamma$-ray transitions are dominantly of $E1$ character, the present measurement allows an access to the low-lying dipole strength in $^{90}$Zr. A $\\gamma$-ray strength function based on the experimental data could be extracted, which is used to describe the total and partial cross sections of this reaction by Hauser-Feshbach calculations successfully. Significant differences with respect to previously measured strength functions from photoabsorption data point towards deviations from the Brink-Axel hypothesis relating the photo-excitation and de-excitation strength functions.

  5. Ferroelectric performances and crystal structures of (Pb, La)(Zr, Ti, Nb)O{sub 3}

    SciTech Connect (OSTI)

    Kitamura, Naoto [Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Division of Ecosystem Research, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Mizoguchi, Takuma [Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Itoh, Takanori [AGC Seimi Chemical Co., Ltd., 3-2-10 Chigasaki-City, Kanagawa 253-8585 (Japan); Idemoto, Yasushi, E-mail: idemoto@rs.noda.tus.ac.jp [Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Division of Ecosystem Research, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan)

    2014-02-15

    In this study, we focused on Nb and La substituted Pb(Zr, Ti)O{sub 3}: i.e., (Pb, La)(Zr, Ti, Nb)O{sub 3}. As for the samples, dependences of ferroelectric properties on La and Nb compositions were examined. In addition, the crystal structures were analyzed by the Rietveld method, and then a relationship between the metal compositions and the crystal structures were discussed. From P–E hysteresis loop measurements, it was found that the remanant polarization of Pb(Zr, Ti)O{sub 3} was increased by both the La and Nb substitutions although the heavy substitution of La had an undesirable effect. It was also indicated that the Curie temperature decreased with increasing La content. The Rietveld analysis using synchrotron X-ray diffraction patterns demonstrated that the structure distortion was relaxed by the La and Nb substitutions. Such a change in the crystals was well consistent with the harmful effects on the Curie temperature and the remanent polarization by the heavy La substitution. - Graphical abstract: Rietveld refinement pattern of 2 mol% PbSiO{sub 3}-added Pb{sub 0.95}La{sub 0.05}Zr{sub 0.50}Ti{sub 0.45}Nb{sub 0.05}O{sub 3} (synchrotron X-ray diffraction). Display Omitted - Highlights: • (Pb,La)(Zr,Ti,Nb)O{sub 3} were successfully synthesized. • Remanant polarization of Pb(Zr,Ti)O{sub 3} was improved by substitutions of La and Nb. • Crystal structures of (Pb,La)(Zr,Ti,Nb)O{sub 3} were refined and the distortions were estimated.

  6. Investigation of Interdiffusion Behavior in the Mo-Zr Binary System via Diffusion Couple Studies

    SciTech Connect (OSTI)

    A. Paz y Puente; J. Dickson; D.D. Keiser, Jr.; Y.H. Sohn

    2014-03-01

    Zirconium has recently garnered attention for use as a diffusion barrier between U–Mo metallic nuclear fuels and Al alloy cladding. In order to gain a fundamental understanding of the diffusional interactions, the interdiffusion behavior in the binary Mo–Zr system was investigated via solid-to-solid diffusion couples annealed in the temperature range of 750 to 1050 degrees C. A combination of scanning electron microscopy, X-ray energy dispersive spectroscopy, and electron probe microanalysis were used to examine the microstructure and concentration profiles across the interdiffusion zone. A large __-Zr (cI2) solid solution layer and a thin (approximately 1–2 um) layer of Mo2Zr (cF24) developed in all couples. Parabolic growth constants and concentration dependent interdiffusion coefficients were calculated for the Mo2Zr and Zr solid solution phases, respectively. The pre-exponential factor and activation energy for growth of the Mo2Zr phase were determined to be approximately 6.5 × 10- 15 m2/s and 90 kJ/mol, respectively. The interdiffusion coefficient in ___-Zr solid solution decreased with an increase in Mo concentration. Both the pre-exponential factors (2 × 10- 8 m2/s at 2 at.% Mo to near 5 × 10- 8 m2/s at 9 at.% Mo) and activation energies (140 kJ/mol at 2 at.% Mo to approximately 155 kJ/mol at 9 at.% Mo) of interdiffusion coefficients were determined to increase with an increase in Mo concentration.

  7. Energy and angular momentum control of the specific opacity functions in the Ba HI~BaI H reaction

    E-Print Network [OSTI]

    , as expected from energy conservation arguments. The nature of the kinematic constraints for this reaction vibrational level v. Detailed analysis of the collision energy dependence of the specific opacity functions the value of bmax . These two processes are identified as the mechanisms that control the Ba HI reaction

  8. The effects of zirconia morphology on methanol synthesis from COand H2 over Cu/ZrO2 catalysts: Part I -- Steady-State Studies

    SciTech Connect (OSTI)

    Rhodes, Michael J.; Bell, Alexis T.

    2005-03-21

    The effect of zirconia phase on the activity and selectivityof Cu/ZrO2 for the hydrogenation of CO has been investigated. Relativelypure t-ZrO2 and m-ZrO2 were prepared with high surface areas (~; 145m2/g). Copper was then deposited onto the surface of these materials byeither incipient-wetness impregnation or deposition-precipitation. For afixed Cu surface area, Cu/m-ZrO2 was tenfold more active for methanolsynthesis than Cu/t-ZrO2 from a feed of 3/1 H2/CO at 3.0 MPa andtemperatures between 473 and 523 K. Cu/m-ZrO2 also exhibited a higherselectivity to methanol. Increasing the Cu surface area on m-ZrO2resulted in further improvement in activity with minimal change inselectivity. Methanol productivity increased linearly for both Cu/t-ZrO2and Cu/m-ZrO2 with increasing Cu surface area. The difference in inherentactivity of each phase paralleled the stronger and larger CO adsorptioncapacity of the Cu/m-ZrO2 as quantified by CO-TPD. The higher COadsorption capacity of Cu/m-ZrO2 is attributed to the presence of a highconcentration of anionic vacancies on the surface of m-ZrO2. Suchvacancies expose cus-Zr4+ cations, which act as Lewis acid centers andenhance the Bronsted acidity of adjacent Zr-OH groups. The presence ofcus-Zr4+ sites and adjacent Bronsted acidic Zr-OH groups contributes tothe adsorption of CO as HCOO-Zr groups, which are the initial precursorsto methanol.

  9. ReaxFF Reactive Force Field for the Y-Doped BaZrO3 Proton Conductor with Applications to Diffusion Rates for Multigranular Systems

    E-Print Network [OSTI]

    Goddard III, William A.

    for a proton ceramic fuel cell (PCFC) that might permit much lower temperatures (from 400 to 600 °C). However of atomistic first principles predictions on models of a complete fuel cell. 1. Introduction Fuel cells provide operation (500-700 °C). Promising candidates for lower temperature fuel cell mem- branes include the family

  10. Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr

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

    Stefanini, A. M.; Montagnoli, G.; Esbensen, H.; Corradi, L.; Courtin, S.; Fioretto, E.; Goasduff, A.; Grebosz, J.; Haas, F.; Mazzocco, M.; et al

    2015-01-29

    The sub-barrier fusion excitation function of 40Ca + 96Zr has been measured down to cross sections ?2.4µb, i.e. two orders of magnitude smaller than obtained in the previous experiment, where the sub-barrier fusion of this system was found to be greatly enhanced with respect to 40Ca + 90Zr, and the need of coupling to transfer channels was suggested. The purpose of this work was to investigate the behavior of 40Ca + 96Zr fusion far below the barrier. The smooth trend of the excitation function has been found to continue, and the logarithmic slope increases very slowly. No indication of hindrancemore »shows up, and a comparison with 48Ca + 96Zr is very useful in this respect. A new CC analysis of the complete excitation function has been performed, including explicitly one- and two-nucleon Q >0 transfer channels. Such transfer couplings bring significant cross section enhancements, even at the level of a few µb. Locating the hindrance threshold, if any, in 40Ca + 96Zr would require challenging measurements of cross sections in the sub-µb range.« less

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

    SciTech Connect (OSTI)

    Uchida, T.; Hirooka, S.; Kato, M.; Morimoto, K.; Sugata, H.; Shibata, K.; Sato, D.

    2013-07-01

    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)

  12. 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

    , yet enrichment in water sources is most often not associated with anomalously high uranium or thorium Rift Valley: Enrichment, retardation, and mixing TAMAR MOISE, ABRAHAM STARINSKY, AMITAI KATZ surrounding rocks into the brine end member. 228 Ra/226 Ra ratios are exceptionally low 0.07 to 0.9, mostly

  13. 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.

    2007-01-01

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

  14. Irradiation-Enhanced Second-Phase Precipitation in Zr-Fe Nanocrystalline Thin Films , A. T. Motta1

    E-Print Network [OSTI]

    Motta, Arthur T.

    Irradiation-Enhanced Second-Phase Precipitation in Zr-Fe Nanocrystalline Thin Films D. Kaoumi1 , A with Fe. Heat treatment in the absence of irradiation was observed to cause precipitation of the Zr2Fe in the presence of ion irradiation. Samples were irradiated in-situ at the Intermediate Voltage Electron

  15. GALACTIC EVOLUTION OF Sr, Y, AND Zr: A MULTIPLICITY OF NUCLEOSYNTHETIC PROCESSES Claudia Travaglio,1,2

    E-Print Network [OSTI]

    Cowan, John

    GALACTIC EVOLUTION OF Sr, Y, AND Zr: A MULTIPLICITY OF NUCLEOSYNTHETIC PROCESSES Claudia Travaglio versus Eu, an almost pure r-process element. We present a detailed analysis of a large published database and Sr, Y, Zr all had the same r-process nucleosynthetic origin. We discuss our chemical evolution

  16. Aging behavior and precipitates analysis of the CuCrZrCe alloy Yi Zhang a,b,d,n

    E-Print Network [OSTI]

    Volinsky, Alex A.

    Aging behavior and precipitates analysis of the Cu­Cr­Zr­Ce alloy Yi Zhang a,b,d,n , Alex A October 2015 Keywords: Cu­Cr­Zr­Ce alloy Cold rolling Aging treatment Microstructure Physical properties rolling and aging for 16 h at 300 °C. Under the same aging conditions, without cold rolling, the hardness

  17. Study of Charm Baryons with the BaBar Experiment

    E-Print Network [OSTI]

    Brian Aa. Petersen

    2006-10-16

    We report on several studies of charm baryon production and decays by the BaBar collaboration. We confirm previous observations of the $\\Xi_c^{'0/+}$, $\\Xi_c(2980)^+$ and $\\Xi_c(3077)^+$ baryons, measure branching ratios for Cabibbo-suppressed $\\Lambda_c^+$ decays and use baryon decays to study the properties of the light-quark baryons, $\\Omega^-$ and $\\Xi(1690)^0$.

  18. Quarkonium Spectroscopy and New States from BaBar

    SciTech Connect (OSTI)

    Vitale, L.; /Trieste U. /INFN, Trieste

    2007-06-08

    We review results on charmonium and bottomonium spectroscopy by the BaBar experiment at the PEP-II e{sup +}e{sup -} collider at SLAC. More space is reserved to the new results like the observation of hadronic non-B{bar B} {Upsilon}(4S) decays and the investigation on the production and decay properties of the recently discovered charmonium-like states X(3872) and Y (4260). These results are preliminary, unless otherwise specified.

  19. Local laser induced rapid thermal oxidation of SOI substrates , R.A. Deutschmann, R. Neumann, K. Brunner, G. Abstreiter

    E-Print Network [OSTI]

    Deutschmann, Rainer

    Local laser induced rapid thermal oxidation of SOI substrates M. Huber* , R.A. Deutschmann, R by a focused laser beam. By focusing the cw light of an argon ion laser at a wavelength of 458 nm (514 nm) we achieve a diffraction limited laser spot of 315 nm (350 nm). The laser spot is scanned over the surface

  20. www.sciencesignaling.org/cgi/content/full/6/263/ra12/DC1 Supplementary Materials for

    E-Print Network [OSTI]

    Higgins, Darren

    .P.); perrimon@receptor.med.harvard.edu (N.P.) Published 19 February 2013, Sci. Signal. 6, ra12 (2013) DOI: 10 (blue). Purple line indicates zone 2 defined on the basis of its position at the junction of TC and SB at the junction with the transverse connective (TC) and in the spiracular abdominal histoblasts (SAH). (B) cut

  1. For assistance contact your Contract Administrator or the eRA Help Desk (5-6263). Office of Research Administration

    E-Print Network [OSTI]

    Hill, Wendell T.

    For assistance contact your Contract Administrator or the eRA Help Desk (5-6263). Office of Research Administration University of Maryland, College Park Fiscal Year 2015 Quick Reference Guide Administrator (http://ora.umd.edu/staff). Complete the Internal Routing Form http://ora.umd.edu/forms/umd Obtain

  2. 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

  3. PRECIPITATION The images above use daily precipitation statistics from NWS COOP, CoCoRaHS, and

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    PRECIPITATION The images above use daily precipitation statistics from NWS COOP, CoCoRaHS, and CoAgMet stations. From top to bottom, and left to right: most recent 7-days of accumulated precipitation in inches; current month-to-date accumulated precipitation in inches; last month's precipitation as a percent

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

    E-Print Network [OSTI]

    Wang, Yongge

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

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

    E-Print Network [OSTI]

    Wang, Yongge

    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

  6. 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]

    Wang, Yongge

    Page 1 | B.A. in Middle Grades Education | Academic Plan of Study Updated March 2014 B.A. in Middle Grades Education Academic Plan of Study College of Education Department of Middle, Secondary and K-12 Education education.uncc.edu/mdsk PROGRAM SUMMARY · Credit Hours: 120-128 · Concentrations: English

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

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Special Education ­ General Curriculum | Academic Plan of Study Updated October 2014 B.A. in Special Education (General Curriculum) Academic Plan of Study College of Education: 120 hours · Concentrations: General Curriculum · Declaring the Major: Minimum of 2.5 GPA requirement

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

    E-Print Network [OSTI]

    Wang, Yongge

    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

  9. 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

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

    SciTech Connect (OSTI)

    Zagar, K.; Recnik, A.; Sturm, S.; Gajovic, A.; Ceh, M.

    2011-03-15

    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.

  11. Photocatalytic studies of Ho–Zr–O nano-composite with controllable composition and defects

    SciTech Connect (OSTI)

    Du, Weimin, E-mail: duweimin75@gmail.com [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455000 (China); Zhao, Guoyan; Chang, Hongxun; Shi, Fei; Zhu, Zhaoqiang [College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan 455000 (China); Qian, Xuefeng [School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240 (China)

    2013-09-15

    With the help of sol–gel method assisted by melting salt, a series of Ho–Zr–O nano-composite with controllable composition and defects have been successfully prepared. Characterization results show that the positions, intensity, and width of the X-ray diffraction peaks of the products have a regular variation with the increase of zirconium element which implies the gradual changes of crystal spacing and product size. At the same time, the molar ratios between holmium and zirconium ions are consistent with the chemical formula and both of them are uniformly distributed in products further showing the perfect formation of targeted materials. Optical properties reveal that diversified defect forms of Ho–Zr–O nano-composite lead to the different absorptions of visible light. Photocatalytic experiments demonstrate Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals have excellent visible-light-responsive photocatalytic activities on some familiar dyes (e.g.: methylene blue and Rhodamine B) which results from the special defect structure, better absorption of visible light and larger specific surface area. It follows that Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals are a new kind of visible-light-responsive photocatalysts with better prospects in conversion and utilization of solar energy. Also, the present melting salt assisted route might be generalized to synthesize other AxByOz composite oxide nano-crystals with more complicated structures. - Highlights: • Ho–Zr–O nano-composite with controllable composition and defects has been obtained. • Diversified defect forms of products lead to the different visible light absorption. • Zr{sub 0.8}Ho{sub 0.2}O{sub 2??} nano-crystals have excellent photocatalytic activities.

  12. Mechanism of Vinylic and Allylic Carbon-Fluorine Bond Activation of Non-Perfluorinated Olefins Using Cp*2ZrH2

    E-Print Network [OSTI]

    Jones, William D.

    Using Cp*2ZrH2 Bradley M. Kraft and William D. Jones* Contribution from the Department of Chemistry, UniVersity of Rochester, Rochester, New York 14627 Received November 16, 2001 Abstract: Cp*2ZrH2 (1) (CpH10) to afford Cp*2ZrHF (2) and hydrodefluorinated products. Experimental evidence suggests

  13. 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)

    2014-07-14

    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.

  14. Search for spin-orbit-force reduction at {sup 106,108}Zr around r-process path

    SciTech Connect (OSTI)

    Sumikama, T.; Yoshinaga, K. [Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 (Japan); Watanabe, H. [RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); and others

    2012-11-12

    Shell gap at the magic number N= 82 is important to reproduce the 2nd peak of r-process abundance. If a spin-orbit force is reduced in a very neutron-rich region, a shell quenching at N= 82 and a new shell closure at N70 are predicted. A shell evolution by the spin-orbit-force reduction can be searched for through the shape evolution of Zr isotopes around an expected double magic nuclei, {sup 110}Zr(Z = 40,N = 70). We performed {beta}-{gamma} and isomer spectroscopy at RIBF to observe low-lying states in {sup 106,108}Zr. The present results indicate a well deformed shape for {sup 106,108}Zr. The drastic reduction of the spin-orbit force most likely does not occur around {sup 110}Zr on an r-process path.

  15. Ab-initio study of high temperature lattice dynamics of BCC zirconium (?-Zr) and uranium (?-U)

    SciTech Connect (OSTI)

    Ghosh, Partha S., E-mail: parthasarathi13@gmail.com; Arya, A., E-mail: parthasarathi13@gmail.com; Dey, G. K., E-mail: parthasarathi13@gmail.com [Materials Science Division, Bhabha Atomic Research Centre, Mumbai-400085 (India)

    2014-04-24

    Using self consistent ab-initio lattice dynamics calculations, we show that bcc structures of Zr and U phases become stable at high temperature by phonon-phonon interactions. The calculated temperature dependent phonon dispersion curve (PDC) of ?-Zr match excellently with experimental PDC. But the calculated PDC for ?-U shows negative phonon frequencies even at solid to liquid transition temperature. We show that this discrepancy is due to an overestimation of instability depth of bcc U phase which is removed by incorporation of spin-orbit coupling in the electronic structure calculations.

  16. Obtaining composite Zr-Al-O coating on the surface of zirconium by microplasma oxidation

    SciTech Connect (OSTI)

    Gubaidulina, Tatiana A. E-mail: ostk@mail2000ru; Kuzmin, Oleg S. E-mail: ostk@mail2000ru; Fedorischva, Marina V. E-mail: kmp1980@mail.ru; Kalashnikov, Mark P. E-mail: kmp1980@mail.ru; Sergeev, Viktor P.

    2014-11-14

    The paper describes the application of the microplasma oxidation for production of Zr-Al-O composition on the surface of zirconium. Certification of a new-type power supply for depositing oxide ceramic coatings by microplasma oxidation was also carried out. The growth rate of Zr-Al-O coating amounted around 0.2 nm/s, which around 10 times exceeds that for depositing similar coatings using the similar equipment. We have studied the change of surface morphology and the chemical composition of the formed ceramic coating by means of EVO 50 scanning electron microscope and X-ray spectral analysis.

  17. Electric characterization of (Sr, Sr-Ba, Ba) M-type ferrites by AC measurements[Alternating Current

    SciTech Connect (OSTI)

    Huanosta-Tera, A.; Lira-Hueso, R. de; Perez-Orta, O.; Palomares-Sanchez, S.A.; Ponce-Castaneda, S.; Mirabal-Garcia, M.

    2000-02-01

    Considering the electrical conductivity in ceramics, necessary reference should be given to dynamic processes occurring as a function of frequency and temperature. Although the most immediate interest in ferrites lies in their magnetic properties, technological applications require a wider knowledge of general physical properties as well. This is especially applicable when the materials are studied as a function of composition or when adding different modifiers. In this report, the authors present results of the ac and dc electric characteristics of a family of magneto-plumbite-type hexaferrites, where Ba gradually substitutes Sr in the Ba{sub x}Sr{sub 1{minus}x}Fe{sub 12}O{sub 19} compound (0 {le} x {le} 1). The results were determined over a wide range of frequencies and temperatures.

  18. InfoEd eRA Portal is maintained by the UConn Office of the Vice President for Research. For technical issues with the eRA system please email eRA-help@uconn.edu, call 860-486-7944, or visit http://training.research.uconn.edu.

    E-Print Network [OSTI]

    Alpay, S. Pamir

    InfoEd® eRA Portal is maintained by the UConn Office of the Vice President for Research functions within the InfoEd portal. The Web VPN service works best with Internet Explorer for Windows an agreement with InfoEd. Connect Via the Web 1. Go to http://sslvpn.uconn.edu/. 2. The UConn Web VPN Portal

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

    SciTech Connect (OSTI)

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

    2015-01-01

    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.

  20. Zr-Hf separation based on a molten salt/metal

    E-Print Network [OSTI]

    Langendoen, Koen

    Zr-Hf separation based on a molten salt/metal equilibrium )URP ROGIDVKLRQHG Ã?DVKEXOEV to newfangled. These involve complicated multistep batch processes. This new purification method is based on molten salt to raw zirconium and hafnium metal, so a molten metal stream can be achieved and tin chloride salts

  1. Transmission electron microscopy examination of oxide layers formed on Zr alloys

    E-Print Network [OSTI]

    Motta, Arthur T.

    Transmission electron microscopy examination of oxide layers formed on Zr alloys Aylin Yilmazbayhan, United States Received 14 July 2005; accepted 31 October 2005 Abstract A transmission electron microscopy. In this work, cross-sectional transmission electron microscopy was used to determine the morphology

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

    E-Print Network [OSTI]

    Bajaj, Saurabh

    2012-02-14

    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. Microfluxgate sensor with amorphous cobalt (Co-Nb-Zr) soft magnetic core for electronic compass

    SciTech Connect (OSTI)

    Na, Kyoung-Won; Yuan, Jingli; Ji, Joon-Ho; Choi, Sang-On [Nano Fabrication Center, Samsung Advanced Institute of Technology (SAIT) (Korea, Republic of); MEMS Laboratory, Samsung Advanced Institute of Technology (SAIT) (Korea, Republic of)

    2006-04-15

    A silicon based microfluxgate sensor with a cobalt based amorphous soft magnetic core for electronic compass is presented in this paper. A sputtered Co{sub 85}Nb{sub 12}Zr{sub 3} magnetic core having a rectangular ring shape is combined with microcopper solenoid coils for excitation and pickup, which were wound alternately around the core to increase the number of coil turns. The Co{sub 85}Nb{sub 12}Zr{sub 3} as a core material is adopted for improving properties of the magnetic core and easy integration with micromachining processes to achieve a small size of the sensor. The sputtered Co{sub 85}Nb{sub 12}Zr{sub 3} showed dc effective permeability of {approx}10 000 and an extremely low coercivity of {approx}0.03 Oe with the thickness of 1 {mu}m. The Co{sub 85}Nb{sub 12}Zr{sub 3} as a thin film core with high permeability and low coercivity was easily saturated by a low excitation magnetic field, enhancing the sensitivity and linearity of the microfluxgate sensor. Finally, the sensor showed excellent linearity response over the range of -300 to 300 {mu}T with sensitivity of 60 V/T at the excitation condition of 3.0 V{sub p-p} and 5.0 MHz square wave form. The sensor size excluding pad region is about 0.55x1.4 mm{sup 2}.

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

    E-Print Network [OSTI]

    Yildiz, Bilge

    of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge transport limits the oxidation kinetics. 1. INTRODUCTION Zirconia (ZrO2) is among the most important metal-6 Furthermore, zirconia is used in biomedical hip implants7 and dental restorations8 and recently

  5. Structural and microstructural changes in monoclinic ZrO{sub 2} during the ball-milling with stainless steel assembly

    SciTech Connect (OSTI)

    Stefanic, G. . E-mail: stefanic@irb.hr; Music, S.; Gajovic, A.

    2006-04-13

    High-energy ball-milling of monoclinic ZrO{sub 2} was performed in air using the planetary ball mill with a stainless steel milling assembly. Structural and microstructural changes during the ball-milling were monitored using X-ray powder diffraction, Raman spectroscopy, Moessbauer spectroscopy, field emission scanning electron microscopy and energy dispersive X-ray spectrometry. The results of line broadening analysis indicated a decrease in the crystallite size and an increase in the microstrains with the ball-milling time increased up to {approx}150 min. The results of quantitative phase analysis indicated the presence of a very small amount of tetragonal ZrO{sub 2} phase in this early stage of ball-milling. The onset of m-ZrO{sub 2} {sup {yields}} t-ZrO{sub 2} transition occurred between 10 and 15 h of ball-milling, which resulted in a complete transition after 20 h of ball-milling. Further ball-milling caused a decrease of the t-ZrO{sub 2} lattice parameters followed by a probable transition into c-ZrO{sub 2}. It was concluded that the stabilization of t- and c-ZrO{sub 2} polymorphs at RT can be attributed to the incorporation of aliovalent cations (Fe{sup 2+}, Fe{sup 3+} and Cr{sup 3+}) introduced into the sample due to the wear and oxidation of the milling media.

  6. 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)

    2014-07-28

    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.

  7. Glass formation in binary and ternary Zr based Fe and Ni bearing alloys

    SciTech Connect (OSTI)

    Savalia, R.T.; Tewari, R.; Banerjee, S.; Dey, G.K.

    1996-01-01

    Rapid solidification of the Zr{sub 76}Fe{sub 24-x}Ni{sub x} alloys (x - 0, 4, 8, 12, 16, 20 and 24) by melt spinning under different conditions has yielded fully amorphous as well as partially crystalline ribbons. The partially crystalline ribbons have been found to contain crystal aggregates comprising a core of the {beta}-Zr phase surrounded by peripheral crystals of the Zr{sub 3}(Fe,Ni) phase in alloys with x < 12. In alloys containing larger amount of Ni (x {ge} 12), both Zr{sub 2}Ni and Zr{sub 3}(Fe,Ni) crystals have been found to be present in the periphery. The nucleation of the core crystals and the peripheral crystals in the undercooled melt has been examined by considering transient and steady state homogeneous and heterogeneous nucleation. The transient nucleation time and the steady state nucleation rate of crystals have been evaluated. For this purpose, use has been made of molar free energy difference {Delta}G{sub c} between the liquid and the crystalline phases determined from experimentally evaluated quantities. The growth of the crystals in the undercooled melt has been examined taking into account recalescence and heat removal during melt spinning. The glass forming ability of the alloys has been evaluated on the basis of the avoidance of crystallization approach. A comparison has been made between the microstructures of the splat cooled and the melt spun alloys in order to understand the process of solidification and the nature of phase transformation during post solidification cooling.

  8. 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OFAMERICA'SHeavyAgency (IRENA)OptionsEquivalentBScirado Brasil LtdaSeeBA

  9. 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

    2012-05-15

    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.

  10. Structure and properties of nanocrystalline ZrN{sub x}O{sub y} thin films: Effect of the oxygen content and film thickness

    SciTech Connect (OSTI)

    Lan, Kuan-Che; Hunag, Jia-Hong; Ai, Chi-Fong; Yu, Ge-Ping [Department of Engineering and System Science, National Tsing Hua University, 101 Kuang Fu Rd., Sec. 2, Hsinchu, 300 Taiwan (China); Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, 325 Taiwan (China); Department of Engineering and System Science, National Tsing Hua University, 101 Kuang Fu Rd., Sec. 2, Hsinchu, 300 Taiwan (China) and Institute of Nuclear Engineering and Science, 101 Kuang Fu Rd., Sec. 2, Hsinchu, 300 Taiwan (China)

    2011-05-15

    The main objective of this study was to investigate the structure and properties of ZrN{sub x}O{sub y} thin films associated with oxygen content and film thickness. ZrN{sub x}O{sub y} thin films were deposited using hollow cathode discharge ion plating on Si (100) substrate. The thickness of ZrN{sub x}O{sub y} films increased with increasing oxygen flow rate, ranging from 143 to 894 nm. Phase separation from ZrN{sub x}O{sub y} to ZrN and monoclinic ZrO{sub 2} (m-ZrO{sub 2}) was observed by x-ray diffraction (XRD). The electrical and mechanical properties were influenced by the film thickness and the amount of separated phase, m-ZrO{sub 2}. ZrN{sub x}O{sub y} thin films with smaller thickness or deposited at higher O{sub 2} flow rate were found to have higher electrical resistivity. Hardness of the ZrN{sub x}O{sub y} thin films increased with increasing thickness, which could be related to microstructure change of the thin films. Residual stress of the ZrN phase in the ZrN{sub x}O{sub y} thin films, measured using the modified sin{sup 2} {psi} XRD method, decreased with increasing oxygen flow rate. The thickness dependence of the residual stress in ZrN was different with different oxygen flow rates. The average residual stress of the ZrN{sub x}O{sub y} thin films also decreased with increasing oxygen flow rate and the stress did not showed significant dependence on the film thickness.

  11. Effect of Zr on microstructures and mechanical properties of an Al-Mg-Si-Cu-Cr alloy prepared by low frequency electromagnetic casting

    SciTech Connect (OSTI)

    Meng, Yi, E-mail: yimonmy@sina.com; Cui, Jianzhong; Zhao, Zhihao; He, Lizi

    2014-06-01

    The Al-1.6Mg-1.2Si-1.1Cu-0.15Cr (all in wt. %) alloys with and without Zr addition prepared by low frequency electromagnetic casting process were investigated by using the optical microscope, scanning electron microscope and transmission electron microscope equipped with energy dispersive analytical X-ray. The effects of Al{sub 3}Zr phases on the microstructures and mechanical properties during solidification, homogenization, hot extrusion and solid solution were studied. The results show that Al{sub 3}Zr phases reduce the grain size by ? 29% and promote the formation of an equiaxed grain structure during solidification. Numerous spherical Al{sub 3}Zr dispersoids with 35–60 nm in diameters precipitate during homogenization, and these fine dispersoids change little during subsequent hot extrusion and solid solution. Adding 0.15 wt. % Zr results in no recrystallization after hot extrusion and partial recrystallization after solid solution, while the recrystallized grain size is 400–550 ?m in extrusion direction in the Zr-free alloy. In addition, adding 0.15 wt. % Zr can obviously promote Q? phase precipitation, while the ?? phases are predominant in the alloy without Zr. Adding 0.15 wt. % Zr, the ultimate tensile strength of the T6 treated alloy increases by 45 MPa, while the elongation remains about 16.7%. - Highlights: • Minor Zr can refine as-cast grains of the LFEC Al-Mg-Si-Cu-Cr alloy. • L1{sub 2} Al{sub 3}Zr phases with 35–60 nm in diameter precipitate during homogenization. • L1{sub 2} and DO{sub 22} Al{sub 3}Zr phases result in partial recrystallization after solid solution. • Minor Zr can promote the precipitation of Q? phases. • Mechanical properties of Al-Mg-Si-Cu-Cr-Zr alloy are higher than those of AA7005.

  12. The Concentrations of {sup 40}K, {sup 226}Ra and {sup 232}Th in Soil Sample in Osmaniye (Turkey)

    SciTech Connect (OSTI)

    Akkurt, I.; Guenoglu, K.; Kara, A.; Mavi, B.; Karaboerklue, S.

    2011-12-26

    The {sup 40}K, {sup 226}Ra and {sup 232}Th concentration is due to the magmatic structure of the earth and it can be varied from place to place. Osmaniye is located in the Eastern side of Mediteranean Region. It holds the climatic characteristics of the same region and arises with Middle Taurus Mountains from west to North and with Amonos Mounations in East and West-east parts and is situated between 35 deg. .52'-36 deg. .42' east longitudes and 36 deg. .57'-37 deg. .45' north latitudes. In this study, the natural radioactivity concentrations {sup 40}K, {sup 226}Ra and {sup 232}Th in some soil samples collected in Osmaniye have been investigated. The measurements have been performed using 3x3{sup ''} NaI(Tl) detector system.

  13. NOx Uptake Mechanism on Pt/BaO/Al2O3 Catalysts

    SciTech Connect (OSTI)

    Kwak, Ja Hun; Kim, Do Heui; Szailer, Tamas; Peden, Charles HF; Szanyi, Janos

    2006-11-01

    The NOx adsorption mechanism on Pt/BaO/Al2O3 catalysts was investigated by performing NOx storage/reduction cycles, NO2 adsorption and NO + O2 adsorption on 2%Pt/(x)BaO/Al2O3 (x = 2, 8 and 20 wt%) catalysts. NOx uptake profiles on 2%Pt/20%BaO/Al2O3 at 523 K show complete uptake behavior for almost 5 min, and then the NOx level starts gradually increasing with time and it reaches 75% of the inlet NOx concentration after 30 min time-on-stream. Although this catalyst shows fairly high NOx conversion at 523 K, only ~ 2.4 wt% out of 20 wt% BaO is converted to Ba(NO3)2. Adsorption studies by using NO2 and NO + O2 suggest two different NOx adsorption mechanisms. The NO2 uptake profile on 2%Pt/20%BaO/Al2O3 shows the absence of a complete NOx uptake period at the beginning of adsorption and the overall NOx uptake is controlled by the gas-solid equilibrium between NO2 and BaO/Ba(NO3)2 phase. When we use NO + O2, complete initial NOx uptake occurs and the time it takes to convert ~ 4 % of BaO to Ba(NO3)2 is independent of the NO concentration. These NOx uptake characteristics suggest that the NO + O2 reaction on the surface of Pt particles produces NO2 that is subsequently transferred to the neighboring BaO phase by spill over. At the beginning of the NOx uptake, this spill-over process is very fast and so it is able to provide complete NOx storage. However, the NOx uptake by this mechanism slows down as BaO in the vicinity of Pt particles are converted to Ba(NO3)2. The formation of Ba(NO3)2 around the Pt particles results in the development of a diffusion barrier for NO2, and increases the probability of NO2 desorption and consequently, the beginning of NOx slip. As NOx uptake by NO2 spill-over mechanism slows down due to the diffusion barrier formation, the rate and extent of NO2 uptake are determined by the diffusion rate of nitrate ions into the BaO bulk, which, in turn, is determined by the gas phase NO2 concentration.

  14. Aging Studies of 2nd Generation BaBar RPCs

    SciTech Connect (OSTI)

    Band, H.R.; /SLAC

    2007-09-25

    The BaBar detector, operating at the PEPII B factory of the Stanford Linear Accelerator Center (SLAC), installed over 200 2nd generation Resistive Plate Chambers (RPCs) in 2002. The streamer rates produced by backgrounds and signals from normal BaBar running vary considerably (0.1- >20 Hz/cm2) depending on the layer and position of the chambers, thus providing a broad spectrum test of RPC performance and aging. The lowest rate chambers have performed very well with stable efficiencies averaging 95%. Other chambers had rate-dependant inefficiencies due to Bakelite drying which were reversed by the introduction of humidified gases. RPC inefficiencies in the highest rate regions of the higher rate chambers have been observed and also found to be rate dependant. The inefficient regions grow with time and have not yet been reduced by operation with humidified input gas. Three of these chambers were converted to avalanche mode operation and display significantly improved efficiencies. The rate of production of HF in the RPC exhaust gases was measured in avalanche and streamer mode RPCs and found to be comparable despite the lower current of the avalanche mode RPCs.

  15. 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

  16. 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

  17. Zelftest chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb.etterbeek@vub.ac.be

    E-Print Network [OSTI]

    Einmahl, Uwe

    Zelftest chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb overzicht van de verwachte voorkennis chemie. 1. Elementaire chemie en chemisch rekenen 1.1 Grootheden en, keukenzout #12;Zelftest chemie voor 1 Ba Biologie Voor meer informatie: contacteer csb.etterbeek@vub.ac.be 1

  18. Zelftest chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb.etterbeek@vub.ac.be

    E-Print Network [OSTI]

    Einmahl, Uwe

    Zelftest chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb overzicht van de verwachte voorkennis chemie 1. Elementaire chemie en chemisch rekenen 1.1 Grootheden en voor: Cl, N, Ag, Pb #12;Zelftest chemie voor 1 Ba Geografie Voor meer informatie: contacteer csb

  19. Preparation of BaTiO3 nanoparticles by combustion spray pyrolysis Sangjin Leea

    E-Print Network [OSTI]

    Messing, Gary L.

    Preparation of BaTiO3 nanoparticles by combustion spray pyrolysis Sangjin Leea , Taehwan Sona were synthesized by combustion spray pyrolysis using a 1:1 molar ratio of oxidizer and fuel. To prepare. Keywords: BaTiO3; Nanomaterials; Spray pyrolysis; Combustion; Powder technology 1. Introduction Fine barium

  20. Chemical reactions between cold trapped Ba+ ions and neutral molecules in the gas phase

    E-Print Network [OSTI]

    Schiller, Stephan

    Chemical reactions between cold trapped Ba+ ions and neutral molecules in the gas phase B. Roth, D-cooled ion trapping apparatus, we have investigated laser-induced chemical reactions between cold trapped Ba is to investigate chemical reactions between cold atomic and molecular ions trapped in radio-frequency traps

  1. Filters for Spatial Point Processes Sumeetpal S. Singh, Ba-Ngu Vo, Adrian Baddeley

    E-Print Network [OSTI]

    Vo, Ba-Ngu

    Filters for Spatial Point Processes Sumeetpal S. Singh, Ba-Ngu Vo, Adrian Baddeley and Sergei Zuyev POINT PROCESSES SUMEETPAL S. SINGH, BA-NGU VO, ADRIAN BADDELEY, AND SERGEI ZUYEV§ Abstract. Let X and Y, University of Strathclyde, Glasgow, UK (sergei@stams.strath.ac.uk). 1 #12;2 S. SINGH, B.-N. VO, A. BADDELEY

  2. Phase transition behavior and high piezoelectric properties in lead-free BaTiO3CaTiO3BaHfO3 ceramics

    E-Print Network [OSTI]

    Cao, Wenwu

    ceramics Dali Wang · Zhaohua Jiang · Bin Yang · Shantao Zhang · Mingfu Zhang · Feifei Guo · Wenwu Cao of lead-free (1-x)Ba(Hf0.16Ti0.84)O3­x (Ba0.70Ca0.30)TiO3 (BCHT) ceramics fabricated by the conventional been proposed based on their dielectric behavior. It is found that BHCT ceramics undergo a complicated

  3. Stellar 30-keV neutron capture in 94,96Zr and the 90Zr(gamma,n)89Zr photonuclear reaction with a high-power liquid-lithium target

    E-Print Network [OSTI]

    Tessler, M; Arenshtam, A; Feinberg, G; Friedman, M; Halfon, S; Kijel, D; Weissman, L; Aviv, O; Berkovits, D; Eisen, Y; Eliyahu, I; Haquin, G; Kreisel, A; Mardor, I; Shimel, G; Shor, A; Silverman, I; Yungrais, Z

    2015-01-01

    A high-power Liquid-Lithium Target (LiLiT) was used for the first time for neutron production via the thick-target 7Li(p,n)7Be reaction and quantitative determination of neutron capture cross sections. Bombarded with a 1-2 mA proton beam at 1.92 MeV from the Soreq Applied Research Accelerator Facility (SARAF), the setup yields a 30-keV quasi-Maxwellian neutron spectrum with an intensity of 3-5e10 n/s, more than one order of magnitude larger than present near-threshold 7Li(p,n) neutron sources. The setup was used here to determine the 30-keV Maxwellian averaged cross section (MACS) of 94Zr and 96Zr as 28.0+-0.6 mb and 12.4+-0.5 mb respectively, based on activation measurements. The precision of the cross section determinations results both from the high neutron yield and from detailed simulations of the entire experimental setup. We plan to extend our experimental studies to low-abundance and radioactive targets. In addition, we show here that the setup yields intense high-energy (17.6 and 14.6 MeV) prompt cap...

  4. Dipole strength distributions in the stable Ba isotopes {sup 134-138}Ba: A study in the mass region of a nuclear shape transition

    SciTech Connect (OSTI)

    Scheck, M.; Garrel, H. von; Belic, D.; Kneissl, U.; Kohstall, C.; Nord, A.; Pitz, H.H.; Stedile, F.; Tsoneva, N.; Brentano, P. von; Fransen, C.; Gade, A.; Jolie, J.; Linnemann, A.; Pietralla, N.; Werner, V.; Stoyanov, C.

    2004-10-01

    The low-lying dipole strength distributions in the odd-mass isotopes {sup 135,137}Ba were studied in nuclear resonance fluorescence experiments (NRF) performed at the Stuttgart Dynamitron facility using bremsstrahlung beams with end point energies of 4.1, 3.1, and 2.5 MeV. Numerous excited states, most of them unknown so far, were observed in the excitation energy range up to 4 MeV. Detailed spectroscopic information has been obtained on excitation energies, decay widths, decay branching ratios, and transition probabilities. The results for {sup 137}Ba are compared with calculations in the framework of the Quasiparticle-Phonon Model. The new data for {sup 135,137}Ba complete the systematics of low-lying dipole excitations as observed for the even Ba isotopes {sup 134,136,138}Ba in previous NRF experiments in Stuttgart. The complete systematics within the Ba isotopic chain, exhibiting a nuclear shape transition, is discussed with respect to E1 two-phonon excitations, M1 scissors mode excitations, and in regard to the new critical point symmetries.

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

    E-Print Network [OSTI]

    Schoen, David Taylor

    2005-01-01

    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. ...

  6. 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)

    2014-04-21

    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.

  7. Lattice dynamics of BaFe2X3(X=S,Se) compounds

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

    Popovi?, Z. V.; Š?epanovi?, M.; Lazarevi?, N.; Opa?i?, M.; Radonji?, M. M.; Tanaskovi?, D.; Lei, Hechang; Petrovic, C.

    2015-02-27

    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

  8. 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

    2015-02-27

    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

  9. Reactive sputtering of ?-ZrH{sub 2} thin films by high power impulse magnetron sputtering and direct current magnetron sputtering

    SciTech Connect (OSTI)

    Högberg, Hans Tengdelius, Lina; Eriksson, Fredrik; Broitman, Esteban; Lu, Jun; Jensen, Jens; Hultman, Lars; Samuelsson, Mattias

    2014-07-01

    Reactive sputtering by high power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (DCMS) of a Zr target in Ar/H{sub 2} plasmas was employed to deposit Zr-H films on Si(100) substrates, and with H content up to 61 at.?% and O contents typically below 0.2 at.?% as determined by elastic recoil detection analysis. X-ray photoelectron spectroscopy reveals a chemical shift of ?0.7?eV to higher binding energies for the Zr-H films compared to pure Zr films, consistent with a charge transfer from Zr to H in a zirconium hydride. X-ray diffraction shows that the films are single-phase ?-ZrH{sub 2} (CaF{sub 2} type structure) at H content >?55 at.?% and pole figure measurements give a 111 preferred orientation for these films. Scanning electron microscopy cross-section images show a glasslike microstructure for the HiPIMS films, while the DCMS films are columnar. Nanoindentation yield hardness values of 5.5–7 GPa for the ?-ZrH{sub 2} films that is slightly harder than the ?5 GPa determined for Zr films and with coefficients of friction in the range of 0.12–0.18 to compare with the range of 0.4–0.6 obtained for Zr films. Wear resistance testing show that phase-pure ?-ZrH{sub 2} films deposited by HiPIMS exhibit up to 50 times lower wear rate compared to those containing a secondary Zr phase. Four-point probe measurements give resistivity values in the range of ?100–120 ?? cm for the ?-ZrH{sub 2} films, which is slightly higher compared to Zr films with values in the range 70–80 ?? cm.

  10. 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

    1994-01-01

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

  11. Thermal behavior of the amorphous precursors of the ZrO{sub 2}-SnO{sub 2} system

    SciTech Connect (OSTI)

    Stefanic, Goran Music, Svetozar; Ivanda, Mile

    2008-11-03

    Thermal behavior of the amorphous precursors of the ZrO{sub 2}-SnO{sub 2} system on the ZrO{sub 2}-rich side of the concentration range, prepared by co-precipitation from aqueous solutions of the corresponding salts, was monitored using differential thermal analysis, X-ray powder diffraction, Raman spectroscopy, field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometry (EDS). The crystallization temperature of the amorphous precursors increased with an increase in the SnO{sub 2} content, from 405 deg. C (0 mol% SnO{sub 2}) to 500 deg. C (40 mol% SnO{sub 2}). Maximum solubility of Sn{sup 4+} ions in the ZrO{sub 2} lattice ({approx}25 mol%) occurred in the metastable products obtained upon crystallization of the amorphous precursors. A precise determination of unit-cell parameters, using both Rietveld and Le Bail refinements of the powder diffraction patterns, shows that the incorporation of Sn{sup 4+} ions causes an asymmetric distortion of the monoclinic ZrO{sub 2} lattice. The results of phase analysis indicate that the incorporation of Sn{sup 4+} ions has no influence on the stabilization of cubic ZrO{sub 2} and negligible influence on the stabilization of tetragonal ZrO{sub 2}. Partial stabilization of tetragonal ZrO{sub 2} in products having a tin content above its solid-solubility limit was attributed to the influence of ZrO{sub 2}-SnO{sub 2} surface interactions. In addition to phases closely structurally related to cassiterite, monoclinic ZrO{sub 2} and tetragonal ZrO{sub 2}, a small amount of metastable ZrSnO{sub 4} phase appeared in the crystallization products of samples with 40 and 50 mol% of SnO{sub 2} calcined at 1000 deg. C. Further temperature treatments caused a decrease in and disappearance of metastable phases. The results of the micro-structural analysis show that the sinterability of the crystallization products significantly decreases with an increase in the SnO{sub 2} content.

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

    SciTech Connect (OSTI)

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

    2011-04-07

    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.

  13. A setup for Ba-ion extraction from high pressure Xe gas for double-beta decay studies with EXO

    E-Print Network [OSTI]

    Gratta, Giorgio

    . Efficient extraction and detection of Ba ions, the decay product of 136 Xe, would allow for a background of the decay product 136 Ba++ allows dif- ferentiation between bb decays and natural background and henceA setup for Ba-ion extraction from high pressure Xe gas for double-beta decay studies with EXO T

  14. Preparation of BaPbO3 functional ceramics from leaded waste Bin Li, Shen-Gen Zhang*, Kun Zhang,

    E-Print Network [OSTI]

    Volinsky, Alex A.

    Preparation of BaPbO3 functional ceramics from leaded waste Bin Li, Shen-Gen Zhang*, Kun Zhang, De conductive ceramics from leaded waste. The experimental results show that BaPbO3 powder syn- thesized at 700 in the air. Synthesized BaPbO3 ceramics have high Curie temperature and high-temperature positive temperature

  15. 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)

    2010-03-15

    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.

  16. The photoluminescence properties of Er{sup 3+}-doped ZrO{sub 2} nanotube arrays prepared by anodization

    SciTech Connect (OSTI)

    Wang, Xixin; Zhao, Jianling; Du, Peng; Guo, Limin; Xu, Xuewen; Tang, Chengchun

    2012-11-15

    Graphical abstract: Display Omitted Highlights: ? Er{sup 3+}-doped ZrO{sub 2} nanotube arrays were prepared by anodization of Zr–Er alloy. ? Small tetragonal zirconia crystallites are tended to be formed due to the doping of Er{sup 3+}. ? Under excitation at 317 nm, the ZrO{sub 2} nantube arrays have strongest photoluminescence intensity. -- Abstract: Er{sup 3+}-doped ZrO{sub 2} nanotube arrays were prepared by anodization of Zr–Er alloy which was obtained by melting zirconium with 1.0 wt% erbium. The morphology, structure and photoluminescence properties were studied through scanning electron microscope, transmission electron microscope, X-ray diffraction and photoluminescence analyzer. X-ray diffraction results indicate that doping of Er{sup 3+} affects the crystal structure and grain size obviously and the Er{sup 3+}-doped samples tend to form small tetragonal grains. Photoluminescence analyses show that when Er{sup 3+}-doped zirconia nanotube arrays are excited at 317 nm, there are two strong photoluminescence emission peaks at 373 nm and 415 nm. When the excitation wavelength is 257 nm, a photoluminescence emission peak appears at 363 nm. Under same measurement conditions, emission peaks of the undoped ZrO{sub 2} nanotube arrays are very weak.

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

    SciTech Connect (OSTI)

    Kalay, Ilkay

    2010-12-15

    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.

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

    SciTech Connect (OSTI)

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

    1987-09-01

    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.

  19. Separate effects identification via casting process modeling for experimental measurement of U–Pu–Zr alloys

    SciTech Connect (OSTI)

    J. Crapps; D. S. DeCroix; J. D. Galloway; D. A. Korzekwa; R. Aikin; R. Fielding; R. Kennedy; C. Unal

    2013-11-01

    Computational simulations of gravity casting processes for metallic U–Pu–Zr nuclear fuel rods have been performed using a design-of-experiments technique to determine the fluid flow, liquid heat transfer, and solid heat transfer parameters which most strongly influence the process solidification speed and fuel rod porosity. The results are used to make recommendations for the best investment of experimental time and effort to measure process parameters.

  20. Irradiation Induced Precipitation and Dissolution of Intermetallics in Zr Alloys Studied Using Synchrotron Radiation

    SciTech Connect (OSTI)

    Arthur T. Motta

    2004-09-21

    The overall aim of this project is to investigate the irradiation induced precipitation of alloying elements and dissolution of second phase particles in Zr alloys using a combination of (1) synchrotron radiation examination of bulk samples using the Advanced Photon Source (APS) at Argonne National Laboratory and (2) in-situ irradiation of model alloys using the IVEM/Tandem Facility also located at Argonne

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

    SciTech Connect (OSTI)

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

    2013-09-01

    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.

  2. Reactivity of Pt/BaO/Al?O? for NOx Storage/Reduction: Effects of Pt and Ba Loading

    SciTech Connect (OSTI)

    Kwak, Ja Hun; Kim, Do Heui; Szanyi, Janos; Szailer, Tamas; Peden, Charles HF

    2005-02-01

    The control of NOx (NO and NO?) emissions from combustion processes, including vehicle engines, remains a challenge particularly for systems operating at high air-to-fuel ratios (so-called ‘lean’ combustion). The current “3-way”, precious metal-based catalytic converters are unable to selectively reduce NOx with reductants (e.g., CO and residual unburned hydrocarbon) in the presence of excess O?. In the last few years, worldwide environmental regulations regarding NOx emissions from diesel engines (inherently operated ‘lean’) have become significantly more stringent resulting in considerable research efforts to reduce NOx under the highly oxidizing engine operation conditions. Urea selective catalytic reduction (SCR) and non-thermal plasma assisted NOx reduction have been explored as possible technologies. In recent years, alkaline and alkaline earth oxide-based NOx storage/reduction catalysts (especially BaO/Al?O?) have been developed, and have shown promising activities for lean-NOx reduction [1,2].

  3. Y-Ba-Cu-O films prepared by a paint-on method

    SciTech Connect (OSTI)

    Shih, I.; Qiu, C.X.

    1988-02-29

    Polycrystalline films of Y-Ba-Cu-O with a thickness of about 20--40 ..mu..m have been prepared on alumina substrates using a paint-on method. The liquid source used was obtained by mixing powder of Y/sub 2/O/sub 3/, BaCO/sub 3/, and CuO in liquid triethanolamine. Several Y-Ba-Cu-O films with an onset temperature of about 100 K and a zero resistance temperature of 85 K have been obtained after a short heat treatment at 1000 /sup 0/C in flowing O/sub 2/.

  4. Self-organization during growth of ZrN/SiN{sub x} multilayers by epitaxial lateral overgrowth

    SciTech Connect (OSTI)

    Fallqvist, A.; Fager, H.; Hultman, L.; Persson, P. O. Å.; Ghafoor, N.

    2013-12-14

    ZrN/SiN{sub x} nanoscale multilayers were deposited on ZrN seed layers grown on top of MgO(001) substrates by dc magnetron sputtering with a constant ZrN thickness of 40 Å and with an intended SiN{sub x} thickness of 2, 4, 6, 8, and 15 Å at a substrate temperature of 800 °C and 6 Å at 500 °C. The films were investigated by X-ray diffraction, high-resolution scanning transmission electron microscopy, and energy dispersive X-ray spectroscopy. The investigations show that the SiN{sub x} is amorphous and that the ZrN layers are crystalline. Growth of epitaxial cubic SiN{sub x}—known to take place on TiN(001)—on ZrN(001) is excluded to the monolayer resolution of this study. During the course of SiN{sub x} deposition, the material segregates to form surface precipitates in discontinuous layers for SiN{sub x} thicknesses ?6 Å that coalesce into continuous layers for 8 and 15 Å thickness at 800 °C, and for 6 Å at 500 °C. The SiN{sub x} precipitates are aligned vertically. The ZrN layers in turn grow by epitaxial lateral overgrowth on the discontinuous SiN{sub x} in samples deposited at 800 °C with up to 6 Å thick SiN{sub x} layers. Effectively a self-organized nanostructure can be grown consisting of strings of 1–3 nm large SiN{sub x} precipitates along apparent column boundaries in the epitaxial ZrN.

  5. 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)

    2013-10-15

    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.

  6. 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

  7. 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

  8. wissen. BaZ | Freitag, 10. Dezember 2010 | Seite 49 Organische Chemie im All

    E-Print Network [OSTI]

    Maier, John Paul

    wissen. BaZ | Freitag, 10. Dezember 2010 | Seite 49 Organische Chemie im All Basler Forscher haben zwischen den Sternen befindlichen organischen Chemie. Warum sollte uns interessieren, aus wieviel

  9. Ba{sub 2}TeO as an optoelectronic material: First-principles study

    SciTech Connect (OSTI)

    Sun, Jifeng; Shi, Hongliang; Du, Mao-Hua; Singh, David J.; Siegrist, Theo

    2015-05-21

    The band structure, optical, and defects properties of Ba{sub 2}TeO are systematically investigated using density functional theory with a view to understanding its potential as an optoelectronic or transparent conducting material. Ba{sub 2}TeO crystallizes with tetragonal structure (space group P4/nmm) and with a 2.93?eV optical bandgap [Besara et al., J. Solid State Chem. 222, 60 (2015)]. We find relatively modest band masses for both electrons and holes suggesting applications. Optical properties show infrared-red absorption when doped. This could potentially be useful for combining wavelength filtering and transparent conducting functions. Furthermore, our defect calculations show that Ba{sub 2}TeO is intrinsically p-type conducting under Ba-poor condition. However, the spontaneous formation of the donor defects may constrain the p-type transport properties and would need to be addressed to enable applications.

  10. High-lying collective rotational states in Ba nuclei: Search for Jacobi Shapes.

    E-Print Network [OSTI]

    Benzoni, Giovanna

    High-lying collective rotational states in Ba nuclei: Search for Jacobi Shapes. G.Benzoni1 , A as a function of spin and compared with the liquid drop predictions including the Jacobi phase transition. 1

  11. Dispersive magnetic excitations in the S=1 antiferromagnet Ba3Mn2O8

    SciTech Connect (OSTI)

    Stone, Matthew B [ORNL; Lumsden, Mark D [ORNL; Qiu, Y. [National Institute of Standards and Technology (NIST); Samulon, Eric C [Stanford University; Batista, C. D. [Los Alamos National Laboratory (LANL); Fisher, Ian R [Stanford University

    2008-01-01

    We present powder inelastic neutron scattering measurements of the $S=1$ dimerized antiferromagnet Ba$_3$Mn$_2$O$_8$. The $T=1.4$~K~magnetic spectrum exhibits a spin-gap of $\\Delta = 0.9$~meV and a dispersive spectrum with a bandwidth of approximately $1.74$~meV. Comparison to coupled dimer models describe the dispersion and scattering intensity accurately and determine the exchange constants in Ba$_3$Mn$_2$O$_8$. Interdimer exchange between triangular lattice dimer bilayers in Ba$_3$Mn$_2$O$_8$ is two orders of magnitude weaker than intradimer exchange. Ba$_3$Mn$_2$O$_8$ is thus a quasi-two-dimensional frustrated bilayer triangular lattice of $S=1$ dimers. The wave vector dependent scattering intensity confirms the proposed $S=1$ dimer bond. Temperature dependent measurements of the magnetic excitations indicate the presence of both singlet-triplet and thermally activated triplet-quintet excitations.

  12. Energy storage for long endurance AUVs G Griffiths, BA, MSc, CEng, MIEE

    E-Print Network [OSTI]

    Griffiths, Gwyn

    Centre, UK J Jamieson Subsea7 Ltd., UK S Mitchell BA Systems Engineering & Assessment Ltd., UK K of Subsea7 where he presently leads the AUV engineering team. His background is in underwater systems

  13. 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)

    2014-08-18

    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.

  14. Elastic and Inelastic-Scattering of Alpha-Particles from Ba-138 

    E-Print Network [OSTI]

    Barker, J. H.; Hiebert, John C.

    1972-01-01

    dist 'b ' srl utions for (n, n' Ba. lOIls FyG 5 138Ba(n, n'~ ~ q Ilg OWlIlg .24-Me V average 1798 J. H. BARKER AND J. C. HIEBERT EXPERIMENT THIS WORK THEORY 4.2419 3.9217 (a) (b) 4 2423 2,3,4 4,1668 2,3t4 4.0810 2 39354 2 3&220 (3,4)~800 2...

  15. Phase transition and dielectric properties of nanograin BaTiO3 ceramic under high pressure

    E-Print Network [OSTI]

    Cao, Wenwu

    Phase transition and dielectric properties of nanograin BaTiO3 ceramic under high pressure Jinlong Temperature dependence of the dielectric constant of nanograin BaTiO3 ceramic has been investigated under decreases with at a rate of dTC/d =-40.0 1.1 K/GPa for coarse-grain ceramic and -34.3 1.4 K/GPa for ceramic

  16. 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

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

    SciTech Connect (OSTI)

    Anand, V K; Quirinale, Dante G; Lee, Yongbin; Harmon, Bruce N; Furukawa, Yuji; Ogloblichev, V V; Huq, A; Abernathy, D L; Stephens, P W; McQueeney, Robert J; Kreyssig, Aandreas; Goldman, Alan I; Johnston, David C

    2014-08-01

    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.

  18. 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)

    2014-09-07

    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.

  19. Measurements of the CKM Angle Alpha at BaBar

    SciTech Connect (OSTI)

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

    2012-04-04

    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.

  20. 137 Ba Double Gamma Decay Measurement with GAMMASPHERE

    SciTech Connect (OSTI)

    Merchán, E.; Moran, K.; Lister, C. J.; Chowdhury, P.; McCutchan, E. A.; Greene, J. P.; Zhu, S.; Lauritsen, T.; Carpenter, M. P.; Shearman, R.

    2015-05-28

    The study of the electromagnetic moments (EM), and decay probability, provides detailed information about nuclear wave functions. The well-know properties of EM interactions are good for extracting information about the motion of nucleons. Higher order EM processes always occur, but are usually too weak to be measured. In the case of a 0+ ? 0+ transitions, where a single gamma transition is forbidden, the simultaneous emission of two ?-rays has been studied. An interesting opportunity to further investigate 2-photon emission phenomena is by using a standard 137Cs source populating, via ?-decay, the J? = 11/2- isomeric state at 662 keV in 137Ba. In this case, two photon process can have contributions from quadrupole-quadrupole or dipole-octupole multipolarities in direct competition with the high multipolarity M4 decay. Since the yield of the double gamma decay is around six orders of magnitude less than the first order transition, very good statistics are needed in order to observe the phenomena and great care must be taken to suppress the first-order decay. The Gammasphere array is ideal since its configuration allows a good coverage of the angular distribution and the Compton events can be suppressed. Nevertheless the process to understand and eliminate the Compton background is a challenge. Geant4 simulations were carried out to help understand and correct for those factors.

  1. 137 Ba Double Gamma Decay Measurement with GAMMASPHERE

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

    Merchán, E.; Moran, K.; Lister, C. J.; Chowdhury, P.; McCutchan, E. A.; Greene, J. P.; Zhu, S.; Lauritsen, T.; Carpenter, M. P.; Shearman, R.

    2015-05-28

    The study of the electromagnetic moments (EM), and decay probability, provides detailed information about nuclear wave functions. The well-know properties of EM interactions are good for extracting information about the motion of nucleons. Higher order EM processes always occur, but are usually too weak to be measured. In the case of a 0+ ? 0+ transitions, where a single gamma transition is forbidden, the simultaneous emission of two ?-rays has been studied. An interesting opportunity to further investigate 2-photon emission phenomena is by using a standard 137Cs source populating, via ?-decay, the J? = 11/2- isomeric state at 662 keVmore »in 137Ba. In this case, two photon process can have contributions from quadrupole-quadrupole or dipole-octupole multipolarities in direct competition with the high multipolarity M4 decay. Since the yield of the double gamma decay is around six orders of magnitude less than the first order transition, very good statistics are needed in order to observe the phenomena and great care must be taken to suppress the first-order decay. The Gammasphere array is ideal since its configuration allows a good coverage of the angular distribution and the Compton events can be suppressed. Nevertheless the process to understand and eliminate the Compton background is a challenge. Geant4 simulations were carried out to help understand and correct for those factors.« less

  2. Generation of Realistic Amorphous Al2O3 And ZrO2 Samples By Hybrid Classical and First-Principle Molecular Dynamics Simulations

    E-Print Network [OSTI]

    Kummel, Andrew C.

    Generation of Realistic Amorphous Al2O3 And ZrO2 Samples By Hybrid Classical and First-ZrO2 were generated by a hybrid classical and density functional theory (DFT) "melt and quench" molecular dynamics approach. The generated samples demonstrated good correlation with reference experimental

  3. Synthesis and hydration behavior of calcium zirconium aluminate (Ca{sub 7}ZrAl{sub 6}O{sub 18}) cement

    SciTech Connect (OSTI)

    Kang, Eun-Hee [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of)] [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of); Yoo, Jun-Sang [Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul 110-749 (Korea, Republic of)] [Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul 110-749 (Korea, Republic of); Kim, Bo-Hye; Choi, Sung-Woo [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of)] [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of); Hong, Seong-Hyeon, E-mail: shhong@snu.ac.kr [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of)] [Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744 (Korea, Republic of)

    2014-02-15

    Calcium zirconium aluminate (Ca{sub 7}ZrAl{sub 6}O{sub 18}) cements were prepared by solid state reaction and polymeric precursor methods, and their phase evolution, morphology, and hydration behavior were investigated. In polymeric precursor method, a nearly single phase Ca{sub 7}ZrAl{sub 6}O{sub 18} was obtained at relatively lower temperature (1200 °C) whereas in solid state reaction, a small amount of CaZrO{sub 3} coexisted with Ca{sub 7}ZrAl{sub 6}O{sub 18} even at higher temperature (1400 °C). Unexpectedly, Ca{sub 7}ZrAl{sub 6}O{sub 18} synthesized by polymeric precursor process was the large-sized and rough-shaped powder. The planetary ball milling was employed to control the particle size and shape. The hydration behavior of Ca{sub 7}ZrAl{sub 6}O{sub 18} was similar to that of Ca{sub 3}Al{sub 2}O{sub 6} (C3A), but the hydration products were Ca{sub 3}Al{sub 2}O{sub 6}·6H{sub 2}O (C3AH6) and several intermediate products. Thus, Zr (or ZrO{sub 2}) stabilized the intermediate hydration products of C3A.

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

    E-Print Network [OSTI]

    Evirgen, Alper

    2014-08-14

    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...

  5. A Novel Combustion Synthesis Preparation of CuO/ZnO/ZrO2/Pd for Oxidative Hydrogen Production from Methanol

    E-Print Network [OSTI]

    Mukasyan, Alexander

    , selectively forming hydrogen and carbon mon- oxide [5­8]. However, when palladium is prepared with ZnO or ZrO2A Novel Combustion Synthesis Preparation of CuO/ZnO/ZrO2/Pd for Oxidative Hydrogen Production from Abstract Complex catalysts containing combinations of copper, zinc, zirconium, and palladium oxides were

  6. SEM in situ MiniCantilever Beam Bending of U-10Mo/Zr/Al Fuel Elements

    SciTech Connect (OSTI)

    Mook, William; Baldwin, Jon K.; Martinez, Ricardo M.; Mara, Nathan A.

    2014-06-16

    In this work, the fracture behavior of Al/Zr and Zr/dU-10Mo interfaces was measured via the minicantilever bend technique. The energy dissipation rates were found to be approximately 3.7-5 mj/mm2 and 5.9 mj/mm2 for each interface, respectively. It was found that in order to test the Zr/U-10Mo interface, location of the hinge of the cantilever was a key parameter. While this test could be adapted to hot cell use through careful alignment fixturing and measurement of crack lengths with an optical microscope (as opposed to SEM, which was used here out of convenience), machining of the cantilevers via MiniMill in such a way as to locate the interfaces at the cantilever hinge, as well as proper placement of a femtosecond laser notch will continue to be key challenges in a hot cell environment.

  7. Modeling of constituent redistribution in U-Pu-Zr metallic fuel.

    SciTech Connect (OSTI)

    Kim, Y. S.; Hofman, G. L.; Hayes, S. L.; Yacout, A. M.; Nuclear Engineering Division; INL

    2006-12-01

    A computer model was developed to analyze constituent redistribution in U-Pu-Zr metallic nuclear fuels. Diffusion and thermochemical properties were parametrically determined to fit the postirradiation data from a fuel test performed in the Experimental Breeder Reactor II (EBR-II). The computer model was used to estimate redistribution profiles of fuels proposed for the conceptual designs of small modular fast reactors. The model results showed that the level of redistribution of the fuel constituents of the designs was similar to the measured data from EBR-II.

  8. Projected shell model study of neutron-rich deformed isotopes of Sr and Zr

    SciTech Connect (OSTI)

    Verma, Sonia; Dar, Parvaiz Ahmad; Devi, Rani [Department of Physics and Electronics, University of Jammu, Jammu-180006 (India)

    2008-02-15

    The projected shell model (PSM) study of {sup 98-102}Sr and {sup 100-104}Zr nuclei is carried out. The reliability of the ground-state wave function is checked by reproducing yrast spectra and electromagnetic properties. The mechanism for the onset of sudden and large deformation at N=60 is worked out. The present piece of research work has unified the two different, or conflicting, early explanations for the onset of deformation at N=60 by the spherical shell model and mean-field theory.

  9. 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; Krompholz, Hermann G.; Vela, Russell; Jorgenson, Roy Eberhardt; Timoshkin, Igor (University of Strathclyde, Glasgow, Scotland); Woodworth, Joseph Ray; Prestwich, Kenneth Randel (Voss Scientific, Albuquerque, NM); Krile, John; 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; 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; 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.; Feltz, Greg; 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)

    2007-03-01

    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.

  10. In situ observation of defect annihilation in Kr ion-irradiated bulk Fe/amorphous-Fe 2 Zr nanocomposite alloy

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

    Yu, K. Y.; Fan, Z.; Chen, Y.; Song, M.; Liu, Y.; Wang, H.; Kirk, M. A.; Li, M.; Zhang, X.

    2014-08-26

    Enhanced irradiation tolerance in crystalline multilayers has received significant attention lately. However, little is known on the irradiation response of crystal/amorphous nanolayers. We report on in situ Kr ion irradiation studies of a bulk Fe96Zr4 nanocomposite alloy. Irradiation resulted in amorphization of Fe2Zr and formed crystal/amorphous nanolayers. ?-Fe layers exhibited drastically lower defect density and size than those in large ?-Fe grains. In situ video revealed that mobile dislocation loops in ?-Fe layers were confined by the crystal/amorphous interfaces and kept migrating to annihilate other defects. This study provides new insights on the design of irradiation-tolerant crystal/amorphous nanocomposites.

  11. 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.

    1985-12-10

    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.

  12. 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

    2013-07-15

    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.

  13. Diffusional Interaction between U-10 wt.% Zr and Fe at 903K, 923K and 953K (630°C, 650°C, and 680°C)

    SciTech Connect (OSTI)

    Park, K Y.; Huang, K.; Paz y Puente, A.; Lee, H. S.; Sencer, B. H.; Kennedy, J. R.

    2014-04-15

    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, ?-U, ?-U, Zr-precipitates, ?, ? 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 ?, ? and ?-phases. The ?, ? 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.

  14. Non-thermal Plasma-Assisted Catalytic NOx Reduction over Ba-Y,FAU: The Effect of Catalyst Preparation

    SciTech Connect (OSTI)

    Kwak, Ja Hun; Szanyi, Janos; Peden, Charles HF

    2003-12-10

    The effects of catalyst preparation on the NOx reduction activity of a series of Ba-Y,FAU zeolites were investigated using a simulated exhaust gas mixture. The introduction of Ba²?ions into Na-Y,FAU results in a large increase in their non-thermal plasma-assisted NOx reduction activity. The NOx reduction activities of Ba-Y,FAU catalysts were found to increase with increasing Ba²? concentration in the aqueous ion exchange solutions, which translated into increased Ba²?/Na² ratios in the resulting materials. Consecutive ion exchange procedures at a given Ba²?concentration in the aqueous solution, however, did not improve the NOx reduction activities of Ba-Y,FAU catalysts, i.e. the activity of the four times ion exchanged material was the same as that of the one that was ion exchanged only once. The reaction profiles for all of these Ba-Y,FAU catalysts were the same. In contrast, a significant increase in NOx reduction activity was observed when a 773K calcination step was implemented after each solution ion exchange. The reaction profile was also altered as a result of the ion exchange/calcination cycles. Calcination that followed each ion exchange step seems to further increase the Ba²?/Na? ratio in the zeolite, and in turn increases the NOx reduction activities of the catalysts prepared this way. Key differences in Na-, and Ba-Y catalysts were found in NO? adsorption and TPD experiments. The amount of chemisorbed NO? is about twice as high in Ba-Y than in Na-Y, and Ba-Y holds NOx much stronger than Na-Y.

  15. Electronic and mechanical properties of Zr{sub 2}TiAl: A first principles study

    SciTech Connect (OSTI)

    Reddy, P. V. Sreenivasa, E-mail: kanchana@iith.ac.in; Kanchana, V., E-mail: kanchana@iith.ac.in [Department of Physics, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502205, Andhra Pradesh (India)

    2014-04-24

    First principles study of electronic and mechanical properties of ternary phase Zr{sub 2}TiAl intermetallic compound has been carried out by using full potential linear augmented plane wave (FP-LAPW) method. Our calculated lattice parameter is in good agreement with the experiment. We find the magnetic phase of the compound to be stable with a magnetic moment of 1.95 ?{sub B}. The major contribution to the total magnetic moment arises mainly from the Ti atom with the local magnetic moment of 1.22 ?{sub B}. From the density of states plots we find the Ti-d and Zr-d to dominate at the Fermi level (E{sub F}) with enhanced crystal field splitting and exchange splitting found in Ti. The mechanical stability of the compound is confirmed from the calculated elastic constants, and we find the compound to be ductile in nature from the calculated Pugh’s ratio and Cauchy’s pressure.

  16. Magnetic Force Microscopy Study of Zr2Co11 -Based Nanocrystalline Materials: Effect of Mo Addition

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

    Yue, Lanping; Jin, Yunlong; Zhang, Wenyong; Sellmyer, David J.

    2015-01-01

    The addition of Molybdenum was used to modify the nanostructure and enhance coercivity of rare-earth-free Zr2Co11-based nanocrystalline permanent magnets. The effect of Mo addition on magnetic domain structures of melt spun nanocrystalline Zr16Co84-xMox(x=0, 0.5, 1, 1.5, and 2.0) ribbons has been investigated. It was found that magnetic properties and local domain structures are strongly influenced by Mo doping. The coercivity of the samples increases with the increase in Mo content (x?1.5). The maximum energy product(BH)maxincreases with increasingxfrom 0.5?MGOe forx=0to a maximum value of 4.2?MGOe forx=1.5. The smallest domain size with a relativelymore »short magnetic correlation length of 128?nm and largest root-mean-square phase shift?rmsvalue of 0.66° are observed for thex=1.5. The optimal Mo addition promotes magnetic domain structure refinement and thus leads to a significant increase in coercivity and energy product in this sample.« less

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

    SciTech Connect (OSTI)

    Purandare, Yashodhan Ehiasarian, Arutiun; Hovsepian, Papken; Santana, Antonio

    2014-05-15

    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.

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

    SciTech Connect (OSTI)

    Cheng, J.Y. Shen, B.; Yu, F.X.

    2013-07-15

    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.

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

    SciTech Connect (OSTI)

    Agrawal, Sadhana E-mail: jsvikasdubey@gmail.com; Dubey, Vikas E-mail: jsvikasdubey@gmail.com

    2014-10-24

    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. 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

    2015-01-01

    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.

  1. Phase-field modeling of the beta to omega phase transformation in Zr–Nb alloys

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

    Yeddu, Hemantha Kumar; Lookman, Turab

    2015-05-01

    A three-dimensional elastoplastic phase-field model is developed, using the Finite Element Method (FEM), for modeling the athermal beta to omega phase transformation in Zr–Nb alloys by including plastic deformation and strain hardening of the material. The microstructure evolution during athermal transformation as well as under different stress states, e.g. uni-axial tensile and compressive, bi-axial tensile and compressive, shear and tri-axial loadings, is studied. The effects of plasticity, stress states and the stress loading direction on the microstructure evolution as well as on the mechanical properties are studied. The input data corresponding to a Zr – 8 at.% Nb alloy aremore »acquired from experimental studies as well as by using the CALPHAD method. Our simulations show that the four different omega variants grow as ellipsoidal shaped particles. Our results show that due to stress relaxation, the athermal phase transformation occurs slightly more readily in the presence of plasticity compared to that in its absence. The evolution of omega phase is different under different stress states, which leads to the differences in the mechanical properties of the material. The variant selection mechanism, i.e. formation of different variants under different stress loading directions, is also nicely captured by our model.« less

  2. Determination of the displacement energy of O, Si and Zr under electron beam irradiation

    SciTech Connect (OSTI)

    Edmondson, Philip D; Weber, William J; Namavar, Fereydoon; Zhang, Yanwen

    2012-01-01

    The response of nanocrystalline, stabilizer-free cubic zirconia thin films on a Si substrate to electron beam irradiation with energies of 4, 110 and 200 keV and fluences up to {approx}1.5 x 10{sup 22} e m{sup -2} has been studied to determine the displacement energies. The 110 and 200 keV irradiations were performed in situ using a transmission electron microscope; the 4 keV irradiations were performed ex situ using an electron gun. In all three irradiations, no structural modification of the zirconia was observed, despite the high fluxes and fluences. However the Si substrate on which the zirconia film was deposited was amorphized under the 200 keV electron irradiation. Examination of the electron-solid interactions reveals that the kinetic energy transfer from the 200 keV electrons to the silicon lattice is sufficient to cause atomic displacements, resulting in amorphization. The kinetic energy transfer from the 200 keV electrons to the oxygen sub-lattice of the zirconia may be sufficient to induce defect production, however, no evidence of defect production was observed. The displacement cross-section value of Zr was found to be {approx}400 times greater than that of O indicating that the O atoms are effectively screened from the electrons by the Zr atoms, and, therefore, the displacement of O is inefficient.

  3. Determination of the Displacement Energies of O, Si and Zr Under Electron Beam Irradiation

    SciTech Connect (OSTI)

    Edmondson, P. D.; Weber, William J.; Namavar, Fereydoon; Zhang, Yanwen

    2012-03-01

    The response of nanocrystalline, stabilizer-free cubic zirconia thin films on a Si substrate to electron beam irradiation with energies of 4, 110 and 200 keV and fluences up to ~1.5 x 10²²e m² has been studied to determine the displacement energies. The 110 and 200 keV irradiations were performed in situ using a transmission electron microscope; the 4 keV irradiations were performed ex situ using an electron gun. In all three irradiations, no structural modification of the zirconia was observed, despite the high fluxes and fluences. However the Si substrate on which the zirconia film was deposited was amorphized under the 200 keV electron irradiation. Examination of the electron–solid interactions reveals that the kinetic energy transfer from the 200 keV electrons to the silicon lattice is sufficient to cause atomic displacements, resulting in amorphization. The kinetic energy transfer from the 200 keV electrons to the oxygen sub-lattice of the zirconia may be sufficient to induce defect production, however, no evidence of defect production was observed. The displacement cross-section value of Zr was found to be ~400 times greater than that of O indicating that the O atoms are effectively screened from the electrons by the Zr atoms, and, therefore, the displacement of O is inefficient.

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

    SciTech Connect (OSTI)

    Machmudah, Siti Widiyastuti, W. Prastuti, Okky Putri Nurtono, Tantular Winardi, Sugeng; Wahyudiono,; Kanda, Hideki; Goto, Motonobu

    2014-02-24

    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.

  5. Ordered omega derivatives in (Zr{sub 3}Al)-Nb alloys

    SciTech Connect (OSTI)

    Tewari, R.; Dey, G.K.; Mukhopadhyay, P.; Banerjee, S.; Bendersky, L.A.

    1998-12-31

    Various kinds of phase transformation, viz., spinodal decomposition, omega transformation, precipitation reactions and martensitic transformation can be induced in ternary (Zr{sub 3}Al)-Nb alloys in conditions far removed from equilibrium. Transformation sequences in alloys containing 3% niobium are described and rationalized in terms of some basic tendencies such as phase separation and chemical ordering in the {beta} (bcc) phase and displacive omega and {beta} to {alpha} (hcp) transformations. Microstructures of rapidly solidified alloy showed a distribution of cuboidal (D8{sub 8} phase) particles in the {beta} matrix. The periodic arrangement of these particles along the <100>{sub {beta}} directions was indicative of a spinodal transformation which preceded their formation. The {beta} {r_arrow} D8{sub 8} transformation could be accomplished by the superimposition of three processes, namely, chemical ordering, lattice collapse akin to {omega} transformation and vacancy ordering. During isothermal aging the D8{sub 8} phase transformed into the B8{sub 2} phase. The observed lattice correspondence and transformation morphology suggested that the D8{sub 8} to B8{sub 2} structural change involved the replacement of structural vacancies in the former by zirconium atoms without any reconstitution of the lattice. The evolution of the equilibrium Zr{sub 3}Al (L1{sub 2} structure) phase during prolonged aging were also studied.

  6. 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

  7. 1. Use the Export function to download data from the RA forms in the RAE 2008 database into files. The Export function supports the following formats

    E-Print Network [OSTI]

    Abrahams, I. David

    1. Use the Export function to download data from the RA forms in the RAE 2008 database into files. The Export function supports the following formats: a. RAE 2008 XML file b. Microsoft Excel c. Microsoft. You can export data from several forms at a time into one file for each of the types a to c

  8. 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

    2015-01-01

    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.

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

    E-Print Network [OSTI]

    Hill, Jeffrey E.

    AE11 Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2 1 T. Place , Dean A greenhouse has one purpose: to provide and maintain the environment or maintain desirable temperature and other environmental conditions in a greenhouse during those periods when

  10. 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

  11. PRECIPITATION The images above use daily precipitation statistics fromNWS COOP, CoCoRaHS, and CoAgMet

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    PRECIPITATION The images above use daily precipitation statistics fromNWS COOP, CoCoRaHS, and CoAgMet stations. Fromtop to bottom, and left to right: most recent 7-days of accumulated precipitation in inches; current month-to-date accumulated precipitation in inches; last month's precipitation as a percent

  12. Colloidal synthesis of BaF2 nanoparticles and their application as fillers in polymer nanocomposites

    SciTech Connect (OSTI)

    Sathyamurthy, Srivatsan [ORNL; Tuncer, Enis [ORNL; More, Karren Leslie [ORNL; Gu, Baohua [ORNL; Sauers, Isidor [ORNL; Paranthaman, Mariappan Parans [ORNL

    2012-01-01

    Nanoparticles of pure and Eu-doped BaF2 have been prepared through sol-gel colloidal synthesis. In addition, BaF2 filled PMMA polymer nanocomposites were fabricated and dielectric properties were measured. The as-synthesized pure and Eu-doped BaF2 nanoparticles were analyzed by both X-ray diffraction and transmission electron microscopy and consisted of crystalline BaF2 particles with an average diameter of 13.6 nm with a standard deviation of about 2.4 nm. The photoluminescence properties of the pure and Eu-doped (2%, 4% and 8%) nanoparticles showed characteristic emission of Eu3+ (5D0 7FJ (J=1-4) transitions). We also measured significantly enhanced dielectric breakdown strength of up to 30% for BaF2 nanocomposites over the unfilled PMMA polymer. This study thus offers some promise of sol-gel synthesis of nanocomposite dielectrics with great potential for use as electrical insulation materials in cryogenic high voltage applications.

  13. Microstructure and Cs Behavior of Ba-Doped Aluminosilicate Pollucite Irradiated with F+ Ions

    SciTech Connect (OSTI)

    Jiang, Weilin; Kovarik, Libor; Zhu, Zihua; Varga, Tamas; Engelhard, Mark H.; Bowden, Mark E.; Nenoff, Tina M.; Garino, Terry

    2014-08-07

    Radionuclide 137Cs is one of the major fission products that dominate heat generation in spent fuels over the first 300 hundred years. A durable waste form for 137Cs that decays to 137Ba is needed to minimize its environmental impact. Aluminosilicate pollucite CsAlSi2O6 is selected as a model waste form to study the decay-induced structural effects. While Ba-containing precipitates are not present in charge-balanced Cs0.9Ba0.05AlSi2O6, they are found in Cs0.9Ba0.1AlSi2O6 and identified as monoclinic Ba2Si3O8. Pollucite is susceptible to electron irradiation induced amorphization. The threshold density of the electronic energy deposition for amorphization is determined to be ~235 keV/nm3. Pollucite can be readily amorphized under F+ ion irradiation at 673 K. A significant amount of Cs diffusion and release from the amorphized pollucite is observed during the irradiation. However, cesium is immobile in the crystalline structure under He+ ion irradiation at room temperature. The critical temperature for amorphization is not higher than 873 K under F+ ion irradiation. If kept at or above 873 K all the time, the pollucite structure is unlikely to be amorphized; Cs diffusion and release are improbable. A general discussion regarding pollucite as a potential waste form is provided in this report.

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

    SciTech Connect (OSTI)

    Li, Yueliang; Liao, Zhenyu; Fang, Fang; Zhu, Jing; Wang, Xiaohui; Li, Longtu

    2014-11-03

    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.

  15. Spin Glasses and Frustration Cynthia Olson, Chairman Transverse spin freezing in a-FexZr100x

    E-Print Network [OSTI]

    Ryan, Dominic

    Spin Glasses and Frustration Cynthia Olson, Chairman Transverse spin freezing in a-FexZr100x signatures of transverse spin freezing provides a clear confirmation of predictions from numerical models with random isotropic spin freezing and neither net magnetization nor long range order. At lower levels

  16. Stress-Induced Phase Transition in Pb(Zr1/2Ti1/2)O3

    E-Print Network [OSTI]

    Rappe, Andrew M.

    with available experimental data. Because many modern piezoelectric device applications involve longitudinal local density functional theory, the structural phase stability of the piezoelectric material Pb(Zr1/2Ti1/2)O3 (PZT) under finite applied uniaxial stress. Previous theoretical analyses of piezoelectric

  17. 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

  18. 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

  19. Structure of Zirconium-Exchanged H-ZSM5 Prepared by Vapor Exchange of ZrCl4

    E-Print Network [OSTI]

    Iglesia, Enrique

    Structure of Zirconium-Exchanged H-ZSM5 Prepared by Vapor Exchange of ZrCl4 Howard S. Lacheen phase. Zirconium silicates (ZrxSi1-xO2) have been reported to form for several zeolite structures

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

    E-Print Network [OSTI]

    Gubicza, Jenõ

    2008-01-01

    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

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

    SciTech Connect (OSTI)

    Smith, G J; Simonson, J W; Orvis, T; Marques, C; Grose, J E; Kistner-Morris, J J; Wu, L; Cho, Kyuil; Kim, Hyong june; Tanatar, Makariy A; Garlea, V O; Prozorov, Ruslan; Zhu, Y; Aronson, M C

    2014-09-17

    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.

  2. Multinucleon transfer reactions for the {sup 28}Si+{sup 90,94}Zr systems in the region below and near the Coulomb barrier

    SciTech Connect (OSTI)

    Kalkal, Sunil; Mandal, S.; Garg, Ritika; Saxena, Mansi; Goyal, Savi; Verma, S.; Kumar, Suresh; Singh, R. [Department of Physics and Astrophysics, University of Delhi, Delhi (India); Madhavan, N.; Jhingan, A.; Nath, S.; Gehlot, J.; Mohanto, Gayatri [Inter University Accelerator Centre, New Delhi (India); Prasad, E. [Department of Physics, Calicut University, Kerala (India); Sandal, Rohit; Behera, B. R. [Department of Physics, Panjab University, Chandigah (India); Pramanik, U. D. [Saha Institute of Nuclear Physics, Kolkata (India); Sinha, A. K. [UGC-DAE Consortium for Scientific Research, Kolkata (India)

    2011-05-15

    Measurements on multinucleon transfer reactions for {sup 28}Si+{sup 90,94}Zr systems were performed at sub- and near-barrier energies. The fact that {sup 90}Zr has a closed neutron shell (N = 50) and {sup 94}Zr has four neutrons outside the closed shell, allows us to investigate the effects of shell closure and pairing correlation on multinucleon transfer mechanism. The experiment was performed with pulsed {sup 28}Si beam using the Heavy Ion Reaction Analyzer (HIRA) at Inter University Accelerator Centre (IUAC), New Delhi. Based on the Q-value considerations, it turned out that pickup channels were neutron transfer whereas stripping channels were proton transfer. For the {sup 28}Si+{sup 90}Zr system, the values of the slope parameter for two-neutron pickup turned out to be less than that for one-neutron pickup. The values of the slope parameter were almost the same for two-, three-, and four-neutron pickup channels in the case of the {sup 28}Si+{sup 94}Zr system. The transfer probabilities in the case of the {sup 28}Si+{sup 94}Zr system were much larger than those for the {sup 28}Si+{sup 90}Zr system, further supporting the fact that there is a correlation between the transfer channels and sub-barrier fusion cross-section enhancement. An odd-even staggering was observed in the extracted transfer probabilities at the barrier radius implying the role of pairing correlation in transfer reactions.

  3. Microstructural evolutions in converting epitaxial Tl2Ba2CaCu2Ox thin films to epitaxial HgBa2CaCu2O6+delta thin films

    E-Print Network [OSTI]

    Wu, Judy; Siegal, M. P.; Xie, Y. Y.; Aytug, T.; Fang, L.

    2003-02-01

    Superconducting HgBa2CaCu2O6+delta (Hg-1212) thin films were obtained from Tl2Ba2CaCu2Ox (Tl-2212) precursor films using a cation-exchange process. In this process, Tl cations on the precursor lattice were thermally excited and then replaced with Hg...

  4. B.A / B.S in Chemistry and B.S. in Biochemistry Learning Outcomes Program B.A. / B.S. Chemistry and B.S. Biochemistry

    E-Print Network [OSTI]

    Hemmers, Oliver

    B.A / B.S in Chemistry and B.S. in Biochemistry Learning Outcomes Program B.A. / B.S. Chemistry and B.S. Biochemistry Department(s) Chemistry College Sciences 1. Student Learning Outcomes for the development of the professional skills needed to be an effective chemist. The B.S. program in Biochemistry

  5. The luminescence of BaF{sub 2} nanoparticles upon high-energy excitation

    SciTech Connect (OSTI)

    Vistovskyy, V. V. Zhyshkovych, A. V.; Halyatkin, O. O.; Voloshinovskii, A. S.; Mitina, N. E.; Zaichenko, A. S.; Rodnyi, P. A.; Vasil'ev, A. N.; Gektin, A. V.

    2014-08-07

    The dependence of X-ray excited luminescence intensity on BaF{sub 2} nanoparticle size was studied. A sharp decrease of self-trapped exciton luminescence intensity was observed when the nanoparticle size is less than 80?nm. The main mechanism of the luminescence quenching is caused by the escape of electrons from the nanoparticles. Escape of electrons from nanoparticles is confirmed by the considerable increase of luminescence intensity of the polystyrene scintillator with embedded BaF{sub 2} nanoparticles comparing with pure polystyrene scintillator.

  6. Deposition and characterization of zirconium nitride (ZrN) thin films by reactive magnetron sputtering with linear gas ion source and bias voltage

    SciTech Connect (OSTI)

    Kavitha, A.; Kannan, R. [Department of Physics, University College of Engineering, Anna University, Dindugal-624622 (India); Subramanian, N. Sankara [Department of Physics, Thiagarajar College of Engineering, Madurai -625015, Tamilnadu (India); Loganathan, S. [Ion Plating, Titan Industries Ltd., Hosur - 635126, Tamilnadu (India)

    2014-04-24

    Zirconium nitride thin films have been prepared on stainless steel substrate (304L grade) by reactive cylindrical magnetron sputtering method with Gas Ion Source (GIS) and bias voltage using optimized coating parameters. The structure and surface morphologies of the ZrN films were characterized using X-ray diffraction, atomic microscopy and scanning electron microscopy. The adhesion property of ZrN thin film has been increased due to the GIS. The coating exhibits better adhesion strength up to 10 N whereas the ZrN thin film with bias voltage exhibits adhesion up to 500 mN.

  7. Effect of cerium incorporation into zirconia on the activity ofCu/ZrO2 for methanol synthesis via CO hydrogenation

    SciTech Connect (OSTI)

    Pokrovski, Konstantin A.; Rhodes, Michael D.; Bell, Alexis T.

    2005-08-24

    The effects of Ce incorporation into ZrO2 on the catalyticperformance of Cu/ZrO2 for the hydrogenation of CO have beeninvestigated. A Ce0.3Zr0.7O2 solid solution was synthesized by forcedhydrolysis at low pH. After calcination at 873 K, XRD and Ramanspectroscopy characterization indicated that the Ce0.3Zr0.7O2 had a t''crystal structure. 1.2 wt percent Cu/Ce0.3Zr0.7O2 exhibited H2consumption peaks at low temperature (<473 K) during H2-TPRindicating a significant fraction (~; 70 percent) of Ce4+ is reduced toCe3+. 1.2 wt percent Cu/Ce0.3Zr0.7O2 is 2.7 times more active formethanol synthesis than 1.2 wt percent Cu/m-ZrO2 at 3.0 MPa attemperatures between 473 and 523 K and exhibits a higher selectivity tomethanol. In-situ infrared spectroscopy shows that, analogous toCu/m-ZrO2, the primary surface species on Cu/Ce0.3Zr0.7O2 during COhydrogenation are formate and methoxide species. A shift in the bandposition of the bridged methoxide species indicated that some of thesegroups were bonded to both Zr4+ and Ce3+ cations. For both catalysts, therate-limiting step for methanol synthesis is the reductive elimination ofmethoxide species. The higher rate of methanol synthesis onCu/Ce0.3Zr0.7O2 relative to Cu/m-ZrO2 was primarily due to a ~; 2.4 timeshigher apparent rate constant, kapp, for methoxide hydrogenation, whichis attributed to the higher surface concentration of H atoms on theformer catalyst. The increased capacity of the Ce-containing catalyst isattributed to interactions of H atoms with Ce-O pairs present at thesurface of the oxide phase.

  8. MICROSTRUCTURE STUDY AND CRYSTALLINE PHASE FORMATION ON Nb2O5-Ba9Ti2O20 MICROWAVE RESONATORS

    E-Print Network [OSTI]

    MICROSTRUCTURE STUDY AND CRYSTALLINE PHASE FORMATION ON Nb2O5-Ba9Ti2O20 MICROWAVE RESONATORS Maria: dielectric resonators, crystalline phases, microstructures, microwave measurements ABSTRACT We report on the development of barium nanotitanate (Ba2Ti9O20) dielectric resonators (DRs) for microwave applications

  9. UNT Core: English Composition & Rhetoric This requirement will be met by fulfilling the B.A. Biochemistry

    E-Print Network [OSTI]

    Mohanty, Saraju P.

    .A. Biochemistry English Composition & Rhetoric requirement (see next column). UNT Core: U.S. History UNT Core the B.A. Biochemistry major mathematics requirement (see next page). UNT Core: Natural Science This requirement will be met by fulfilling the B.A. Biochemistry major requirements (see next column). Courses

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

    E-Print Network [OSTI]

    Kunkle, Tom

    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

  11. 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

  12. The AMiBA Project Patrick KOCH, Pablo ALTAMIRANO, Chia-Hao CHANG, Shu-Hao CHANG, Su-Wei

    E-Print Network [OSTI]

    Koch, Patrick

    Cassegrain antennas in a compact configuration, Fig.1. Fig.1: The AMiBA hexapod and the first cluster of the AMiBA telescope are illustrated in Fig.2. A hexapod mount drives a 6m diameter reconfigurable platform made from carbon fibre reinforced plastic (CFRP). The #12;hexapod operating range is limited to 30

  13. Optical spectroscopy study of the three-dimensional Dirac semimetal ZrTe5

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

    Chen, R. Y.; Gu, G. D.; Zhang, S. J.; Schneeloch, J. A.; Zhang, C.; Li, Q.; Wang, N. L.

    2015-08-05

    Three-dimensional (3D) topological Dirac materials have been under intensive study recently. The layered compound ZrTe5 has been suggested to be one such material as a result of transport and angle-resolved photoemission spectroscopy experiments. Here, we perform infrared reflectivity measurements to investigate the underlying physics of this material. The derived optical conductivity increases linearly with frequency below normal interband transitions, which provides optical spectroscopic proof of a 3D Dirac semimetal. In addition, the plasma edge shifts dramatically to lower energy upon temperature cooling, which might be due to the shrinking of the lattice parameters. Additionally, an extremely sharp peak shows upmore »in the frequency-dependent optical conductivity, indicating the presence of a Van Hove singularity in the joint density of state.« less

  14. 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

    2013-01-01

    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.

  15. Thick Pb(Zr,Ti)O{sub 3} film without substrate

    SciTech Connect (OSTI)

    Lee, Jae-Wung; Park, Chee-Sung; Jo, Ji-Hoon; Kim, Hyoun-Ee [Department of Materials Science and Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of)

    2007-08-13

    In order to fabricate thick PbZr{sub x}Ti{sub 1-x}O{sub 3} (PZT) films for microelectromechanical system applications, the authors introduce a concept of freestanding film without a substrate. PZT films with a thickness of up to 20 {mu}m were deposited on a very thin Pt layer without a substrate by the rf-magnetron sputtering method using a single oxide target. The Pt layer (thickness <1 {mu}m) was obtained by sputtering the Pt on a Si substrate with a carbon layer between them, and subsequently removing the carbon layer by oxidation in air at 400 deg. C. Piezoelectric properties of the film were comparable to those of bulk PZT as a result of the removal of clamping effect of the substrate.

  16. LANL Experience Rolling Zr-Clad LEU-10Mo Foils for AFIP-7

    SciTech Connect (OSTI)

    Hammon, Duncan L.; Clarke, Kester D.; Alexander, David J.; Kennedy, Patrick K.; Edwards, Randall L.; Duffield, Andrew N.; Dombrowski, David E.

    2015-05-29

    The cleaning, canning, rolling and final trimming of Low Enriched Uranium-10 wt. pct. Molybdenum (LEU-10Mo) foils for ATR (Advanced Test Reactor) fuel plates to be used in the AFIP-7 (ATR Full Size Plate In Center Flux Trap Position) experiments are summarized. Six Zr-clad foils were produced from two LEU-10Mo castings supplied to Los Alamos National Laboratory (LANL) by Y-12 National Security Complex. Details of cleaning and canning procedures are provided. Hot- and cold-rolling results are presented, including rolling schedules, images of foils in-process, metallography and local compositions of regions of interest, and details of final foil dimensions and process yield. This report was compiled from the slides for the presentation of the same name given by Duncan Hammon on May 12, 2011 at the AFIP-7 Lessons Learned meeting in Salt Lake City, UT, with Los Alamos National Laboratory document number LA-UR 11-02898.

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

    SciTech Connect (OSTI)

    Din, Israf Ud E-mail: maizats@petronas.com.my; Shaharun, Maizatul S. E-mail: maizats@petronas.com.my; Subbarao, Duvvuri; Naeem, A.

    2014-10-24

    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.

  18. 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)

    1993-01-01

    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.

  19. 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.

    2007-03-01

    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.

  20. Interface control of ferroelectricity in LaNiO{sub 3}-BaTiO{sub 3} superlattices

    SciTech Connect (OSTI)

    Wu, Yin-Zhong, E-mail: yzwu@cslg.edu.cn [Jiangsu Laboratory of Advanced Functional Materials and Physics Department, Changshu Institute of Technology, Changshu 215500 (China); School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009 (China); Lu, Hai-Shuang; Cai, Tian-Yi; Ju, Sheng, E-mail: jusheng@suda.edu.cn [Department of Physics and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006 (China)

    2014-08-15

    LaNiO{sub 3}-BaTiO{sub 3} superlattices with different types of interfaces are studied from first-principles density-functional theory. It is revealed that the ferroelectricity in the superlattice with (NiO{sub 2}){sup ?}/(BaO){sup 0} interfaces is enhanced from that of the superlattice with (LaO){sup +}/(TiO{sub 2}){sup 0} interfaces. The origin lies at the polar discontinuity at the interface, which makes the holes localized within the (NiO{sub 2}){sup ?}/(BaO){sup 0} interface, but drives a penetration of electrons into BaTiO{sub 3} component near (LaO){sup +}/(TiO{sub 2}){sup 0} interface. Our calculations demonstrate an effective avenue to the robust ferroelectricity in BaTiO{sub 3} ultrathin films.

  1. Effect of annealing temperature on optical and electrical properties of ZrO{sub 2}?SnO{sub 2} based nanocomposite thin films

    SciTech Connect (OSTI)

    Anitha, V. S., E-mail: jolly2jolly@gmail.com; Lekshmy, S. Sujatha, E-mail: jolly2jolly@gmail.com; Berlin, I. John, E-mail: jolly2jolly@gmail.com; Joy, K., E-mail: jolly2jolly@gmail.com [Thin film Laboratory, Post Graduate and Research Department of Physics, Mar Ivanios College, Thiruvananthapuram 695 015 (India)

    2014-01-28

    Transparent nanocomposite ZrO{sub 2}?SnO{sub 2} thin films were prepared by sol-gel dip-coating technique. Films were annealed at 500°C, 800°C and 1200°C respectively. X-ray diffraction(XRD) spectra showed a mixture of three phases: tetragonal ZrO{sub 2} and SnO{sub 2} and orthorhombic ZrSnO{sub 4}. The grain size of all the three phases' increased with annealing temperature. An average transmittance greater than 85%(in UV-Visible region) is observed for all the films. The band gap for the films decreased from 4.79 eV to 4.62 eV with increase in annealing temperature from 500 to 1200 °C. The electrical resistivity increased with increase in annealing temperature. Such composite ZrO{sub 2}?SnO{sub 2} films can be used in many applications and in optoelectronic devices.

  2. Effect of cerium incorporation into zirconia on the activity of Cu/ZrO2 for methanol synthesis via CO hydrogenation

    E-Print Network [OSTI]

    Pokrovski, Konstantin A.; Rhodes, Michael D.; Bell, Alexis T.

    2005-01-01

    Cerium Incorporation into Zirconia on the Activity of Cu/ZrOhydrogenation to methanol [1-6]. Zirconia has proven to be aon the surface of zirconia to form formate species which

  3. 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

    2008-01-01

    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 ...

  4. 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)

    2014-06-16

    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.

  5. 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

  6. 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

  7. 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 CMPS 185 Technical Writing & Communication in Computer Science CMPS 115 Software Methodology CMPE 110) upper division Computer Science courses selected from all upper division CMPS courses except those

  8. 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 must complete 2 additional 5-unit (or more) upper division Computer Science courses selected from all on back for courses) 2. Receive a score of 600 or above on the GRE Computer Science Subject Test 3. Submit

  9. B.A. Master of Architecture Plan (173 credits) Year 1 (32-33 credits)

    E-Print Network [OSTI]

    B.A. ­ Master of Architecture Plan (173 credits) Year 1 (32-33 credits) Fall (16 credits) Spring (16-17 credits) ARCH 103 Introduction to Architecture (3) BDS 102 Thinking & Making Studio II (3) ARCH Culture of Building Technology (3) ARCH 630 Theory & Context (3) ARCH 530 Environmental Systems I (3

  10. 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

    2011-12-31

    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.

  11. History, Social Sciences, Secondary Education BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    History, Social Sciences, Secondary Education BA, 2015-2016 Name ID# Date Course Number and Title required by the History Department will be determined by the Department of World Languages or the History Department. 4 HIST 111/211 United States History 3 HIST 112/212 United States History 3 CID HIST 220 or HIST

  12. History of Art and Visual Culture BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    History of Art and Visual Culture BA, 2015-2016 Name ID# Date Course Number and Title Credits Foundations I and II 6 CID ART 298 Seminar 3 ARTHIST 102 Survey of Western Art II 3 ARTHIST 450 Art History Practicum 3 FF ARTHIST 452 Methods and Theory in Art History 3 ARTHIST 499 Art History Seminar 3 One Ancient

  13. A FIELD STUDY OF THE INDUSTRIAL MODELING B.A. Foss B. Lohmann W. Marquardt

    E-Print Network [OSTI]

    Foss, Bjarne A.

    A FIELD STUDY OF THE INDUSTRIAL MODELING PROCESS B.A. Foss B. Lohmann W. Marquardt Department the modeling process by means of a eld study in the chemical industries. A diversi ed set of experienced in the process industries were treated as well. The information has been summarized and presented in a structured

  14. 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

  15. 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

  16. 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

  17. 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

  18. Smart Golf Reservation iPhone App A. Rahimi, B.A. Shirazi, R. Makamson

    E-Print Network [OSTI]

    Collins, Gary S.

    Smart Golf Reservation iPhone App A. Rahimi, B.A. Shirazi, R. Makamson WSU REU 2011 ­ Electrical-0647705 Introduction This project is focused on creating a smart golf reservation iPhone app. After they book the tee time, the user will be redirected to the home page, and they will be sent

  19. Updated 1/2013 B.A. in Political Science Degree Requirements

    E-Print Network [OSTI]

    Fernandez, Eduardo

    Theory and Public Policy Course Title Course Number # of credits Issues in American Politics POS 3033 3 Environmental Politics and Politics INR 4350 3 Advanced Diplomacy INR 4503 3 Special Topics INR 4932 3 DirectedUpdated 1/2013 B.A. in Political Science Degree Requirements The Department of Political Science

  20. A Competition-Ba sed Explanation of Syntactic Attachment Preferences and Garden Path Phenomena

    E-Print Network [OSTI]

    A Competition-Ba sed Explanation of Syntactic Attachment Preferences and Garden Path Phenomena suzanne@cs.toronto.edu Abstract This paper presents a massively parallel parser that pre- dicts critical or revision strategies. The processing of a syntactic am- biguity is modeled as an active, distributed

  1. Approved December 12, 2003 Associate in Arts to BA in Art

    E-Print Network [OSTI]

    Gering, Jon C.

    Approved December 12, 2003 Associate in Arts to BA in Art Students will complete the following courses through their Associate in Arts Degree at Metropolitan: American Institutions--6 credits HIST 120-19 credits ART 110 Basic Drawing ­ 3 credits ART 101 Art Fundamentals II ­ 3 credits ART 150 History of Art I

  2. Biomagnetic monitoring of industry-derived particulate pollution R. Hansard a,*, B.A. Maher a

    E-Print Network [OSTI]

    Maher, Barbara

    Biomagnetic monitoring of industry-derived particulate pollution R. Hansard a,*, B.A. Maher a , R. Kinnersley b a Centre for Environmental Magnetism and Palaeomagnetism, Lancaster Environment Centre, University of Lancaster, Lancaster LA1 4YQ, UK b Evidence Directorate, Environment Agency, Olton Court, 10

  3. Combined Honours BA Digital Journalism and English Language, Literature and Creative Writing

    E-Print Network [OSTI]

    Combined Honours BA Digital Journalism and English Language, Literature and Creative Writing How do? A grassroots commentator with a laptop? www.uwindsor.ca/digitaljournalism In any format, journalism today has degree in English and a degree concentration in the specific professional skills of web-based journalism

  4. Music BA General Concentration Vocal, pre-MAE Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    Music ­ BA General Concentration ­ Vocal, pre-MAE Fall--First Year MUSI 130: Music Analysis I MUSI 132: Aural Skills in Music I MUSI 279: Concert and Recital Atten. MUSI 153: Keyboard Skills I Studies Program (LSP) coursework Fall--Second Year MUSI 230: Music Analysis III MUSI 232: Aural Skills

  5. BA / BME / BM Music Department of Music DOROTHY F. SCHMIDT COLLEGE OF ARTS &

    E-Print Network [OSTI]

    Fernandez, Eduardo

    BA / BME / BM Music Department of Music DOROTHY F. SCHMIDT COLLEGE OF ARTS & LETTERS Bachelor of Arts in Music Bachelor of Music with Major in Music: Performance Concentrations Bachelor of Music with Major in Commercial Music: Commercial Music Composition or Music Technology Track Bachelor of Music

  6. Music BA General Concentration Instrumental, pre-MAE Fall--First Year

    E-Print Network [OSTI]

    Gering, Jon C.

    Music ­ BA General Concentration ­ Instrumental, pre-MAE Fall--First Year MUSI 130: Music Analysis I MUSI 132: Aural Skills in Music I MUSI 279: Concert and Recital Atten. MUSI 153: Keyboard Liberal Studies Program (LSP) coursework Fall--Second Year MUSI 230: Music Analysis III MUSI 232: Aural

  7. 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

  8. 6/06/09 BA in General Biology Bachelor of Arts in General Biology

    E-Print Network [OSTI]

    6/06/09 BA in General Biology Bachelor of Arts in General Biology Department of Biology College of Science and Engineering Undergraduate Programs Students majoring in the General Biology degree program are required to complete 57 units in the major. In addition to the biological science courses, it includes

  9. 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 in major courses. --The Chemistry and Biochemistry Department requires the final 10 hours of required Biophysical Chemistry Chem 481M Biochemistry­Majors Chem 584 Biochemistry Lab/Proteins Or Chem 586

  10. 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 481M Biochemistry­Majors Chem 584 Biochemistry Lab/Proteins Or Chem 586 Biochemistry Lab/Nucleic Acids

  11. Communication BA, Public Communication Emphasis, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Communication BA, Public Communication Emphasis, 2015-2016 Name ID# Date Course Number and Title Fundamentals of Communication 3 DLS Social Sciences course in a second field 3 Communication Arts - choose one Communication Contexts - choose one from the following: COMM 221, COMM 341, COMM 351, COMM 356, COMM 361, COMM

  12. Communication BA, Relational and Organizational Studies Emphasis, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Communication BA, Relational and Organizational Studies Emphasis, 2015-2016 Name ID# Date Course-4 DLS COMM 101 Fundamentals of Communication 3 DLS Social Sciences course in a second field 3 Communication Arts - choose one from the following: COMM 131, COMM 211, COMM 231, COMM 268, COMM 269, COMM 273

  13. Communication BA, Journalism and Media Studies Emphasis, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Communication BA, Journalism and Media Studies Emphasis, 2015-2016 Name ID# Date Course Number 101 Fundamentals of Communication 3 DLS Social Sciences course in a second field 3 Communication Arts Communication Contexts - choose one from the following: COMM 221, COMM 341, COMM 351, COMM 356, COMM 361, COMM

  14. Communication BA, Media Production Emphasis, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Communication BA, Media Production Emphasis, 2015-2016 Name ID# Date Course Number and Title Fundamentals of Communication 3 DLS Social Sciences course in a second field 3 Communication Arts - choose one Communication Contexts - choose one from the following: COMM 221, COMM 341, COMM 351, COMM 356, COMM 361, COMM

  15. 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.

    2012-11-01

    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.

  16. ISABEL PATRICIA MONTAEZ Education: B.A. Geology (May 1981) Bryn Mawr College, Bryn Mawr, PA

    E-Print Network [OSTI]

    Montañez, Isabel Patricia

    ISABEL PATRICIA MONTAÑEZ Education: B.A. Geology (May 1981) Bryn Mawr College, Bryn Mawr, PA Ph.D. Geology (Dec. 1989) Virginia Polytechnic Institute, Blacksburg, VA Employment: Department of Geology, University of California, Davis Full Professor of Geology July 2000 to present Associate Professor of Geology

  17. Approved September 12, 2003 Associate in Arts to BA/BS in Psychology

    E-Print Network [OSTI]

    Gering, Jon C.

    Approved September 12, 2003 Associate in Arts to BA/BS in Psychology Students will complete Sciences--6 credits PSYC 140 General Psychology Complete one additional 3-credit course: #12;Approved Lifespan Development ­ 4 credits OR PSYC 250 Social Psychology ­ 3 credits No more than one

  18. For students starting in Fall 2014 BA Double Major Social Studies & Secondary Education

    E-Print Network [OSTI]

    ­ Intro. to Environmental Studies 3 EDU 102 ­ Philosophy of Education OR EDU 103 ­ History of Education 3For students starting in Fall 2014 BA Double Major Social Studies & Secondary Education Major in Social Studies ­ Discipline Courses Major in Secondary Education - Courses Practicum Requirements ESG 100

  19. 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.

    2008-01-01

    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 transition in (139)La...

  20. Economics, Social Science Secondary Education Emphasis BA, 2015-2016 Name ID# Date

    E-Print Network [OSTI]

    Barrash, Warren

    Economics, Social Science Secondary Education Emphasis BA, 2015-2016 Name ID# Date Course Number CID ECON 421 Quantitative Methods in Economics 3 FF ECON 422 Econometrics 3 Upper-division economics. 14 Social science field other than economics (history, political science, or sociology) 21 Electives

  1. 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

    2012-11-26

    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

  2. Roadmap: Geography -Geographic Information -Bachelor of Arts AS-BA-GEOG-GINF

    E-Print Network [OSTI]

    Khan, Javed I.

    Roadmap: Geography - Geographic Information - Bachelor of Arts AS-BA-GEOG-GINF College of Arts and Sciences Department of Geography Catalog Year: 2015-2016 Page 1 of 3 | Last Updated: 22-Apr-15/KJS Credits] ! GEOG 17063 World Geography or GEOG 17064 Geography of the United States and Canada 3 DG/KSS DD

  3. Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric

    E-Print Network [OSTI]

    Cao, Guozhong

    Hierarchically structured TiO2 for Ba-filled skutterudite with enhanced thermoelectric performance be considered. Thermoelectric (TE) materials are a very good candidate to achieve a more efficient usage performance of a thermoelectric material is governed by its power factor P ¼ S2 s. The challenge to develop

  4. Microstructural characterization of a thin film ZrN diffusion barrier in an As-fabricated U–7Mo/Al matrix dispersion fuel plate

    SciTech Connect (OSTI)

    Keiser, Dennis D.; Perez, Emmanuel; Wiencek, Tom; Leenaers, Ann; Van den Berghe, Sven

    2015-03-01

    The United States High Performance Research Reactor Fuel Development program is developing low enriched uranium fuels for application in research and test reactors. One concept utilizes U–7 wt.% Mo (U–7Mo) fuel particles dispersed in Al matrix, where the fuel particles are coated with a 1 ?m-thick ZrN coating. The ZrN serves as a diffusion barrier to eliminate a deleterious reaction that can occur between U–7Mo and Al when a dispersion fuel is irradiated under aggressive reactor conditions. To investigate the final microstructure of a physically-vapor-deposited ZrN coating in a dispersion fuel plate after it was fabricated using a rolling process, characterization samples were taken from a fuel plate that was fabricated at 500 °C using ZrN-coated U–7Mo particles, Al matrix and AA6061 cladding. Scanning electron and transmission electron microscopy analysis were performed. Data from these analyses will be used to support future microstructural examinations of irradiated fuel plates, in terms of understanding the effects of irradiation on the ZrN microstructure, and to determine the role of diffusion barrier microstructure in eliminating fuel/matrix interactions during irradiation. The as-fabricated coating was determined to be cubic-ZrN (cF8) phase. It exhibited a columnar microstructure comprised of nanometer-sized grains and a region of relatively high porosity, mainly near the Al matrix. Small impurity-containing phases were observed at the U–7Mo/ZrN interface, and no interaction zone was observed at the ZrN/Al interface. The bonding between the U–7Mo and ZrN appeared to be mechanical in nature. A relatively high level of oxygen was observed in the ZrN coating, extending from the Al matrix in the ZrN coating in decreasing concentration. The above microstructural characteristics are discussed in terms of what may be most optimal for a diffusion barrier in a dispersion fuel plate application.

  5. 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)

    2013-07-15

    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.

  6. Design of 7 wt.% Y2O3-ZrO2/Mullite Plasma-Sprayed Composite Coatings for Increased Creep Resistance

    E-Print Network [OSTI]

    Trice, Rodney W.

    Design of 7 wt.% Y2O3-ZrO2/Mullite Plasma-Sprayed Composite Coatings for Increased Creep Resistance of the American Ceramic Society #12;2 Abstract Plasma-sprayed stand-alone coatings of 7 wt.% Y2O3-ZrO2 (YSZ three coating types in the as-sprayed condition at stresses from 40-80 MPa and temperatures of 1000

  7. Preparation of Lead Zirconate Titanate (Pb(Zr0.52Ti0.48)O3) by Homogeneous Precipitation and Calcination

    E-Print Network [OSTI]

    Tas, A. Cuneyt

    University, Ankara 06531, Turkey Preparation of phase-pure PZT (Pb(Zr0.52Ti0.48)O3) pow- ders was achieved, Darmstadt, Germany), ZrOCl2 8H2O (99%, Merck, Darmstadt, Germany), and TiCl4 (98%, Merck, Darmstadt, Germany4N2O, 99.5%, Riedel-De Haen AG, Germany) was used as the precipitation agent. (1) Homogeneous

  8. The Department of Energy's Management of the Award of a $150 Million Recovery Act Grant to LG Chem Michigan Inc., OAS-RA-13-10

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11 SeptemberManagement

  9. The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the Commonwealth of Virginia, OAS-RA-11-14

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11RenewableUse

  10. The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of New York, OAS-RA-12-07

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11RenewableUse

  11. The Department of Energy's Weatherization Assistance Program Funded under the American Recovery and Reinvestment Act for the State of New York, OAS-RA-12-07

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11RenewableUse

  12. 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.

    2011-01-11

    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

  13. 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.

    2011-01-11

    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.

  14. Understanding ferromagnetism and optical absorption in 3d transition metal-doped cubic ZrO{sub 2} with the modified Becke-Johnson exchange-correlation functional

    SciTech Connect (OSTI)

    Boujnah, M.; Zaari, H.; El Kenz, A.; Labrim, H.; Benyoussef, A.; Mounkachi, O.

    2014-03-28

    The electronic structure, magnetic, and optical properties in cubic crystalline phase of Zr{sub 1?x}TM{sub x}O{sub 2} (TM?=?V, Mn, Fe, and Co) at x?=?6.25% are studied using density functional theory with the Generalized Gradient Approximation and the modified Becke-Johnson of the exchange-correlation energy and potential. In our calculations, the zirconia is a p-type semiconductor and has a large band gap. We evaluated the possibility of long-range magnetic order for transition metal ions substituting Zr. Our results show that ferromagnetism is the ground state in V, Mn, and Fe-doped ZrO{sub 2} and have a high value of energy in Mn-doped ZrO{sub 2}. However, in Co-doped ZrO{sub 2}, antiferromagnetic ordering is more stable than the ferromagnetic one. The exchange interaction mechanism has been discussed to explain the responsible of this stability. Moreover, it has been found that the V, Mn, and Fe transition metals provide half-metallic properties considered to be the leading cause, responsible for ferromagnetism. Furthermore, the optical absorption spectra in the TM -doped cubic ZrO{sub 2} are investigated.

  15. 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)

    2013-07-14

    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.

  16. Iron-stabilized nanocrystalline ZrO{sub 2} solid solutions: Synthesis by combustion and thermal stability

    SciTech Connect (OSTI)

    Legorreta Garcia, Felipe; Resende, Valdirene Gonzaga de; De Grave, Eddy; Peigney, Alain; Barnabe, Antoine; Laurent, Christophe

    2009-06-03

    The synthesis of Fe{sup 3+}-stabilized zirconia by the nitrate/urea combustion route was investigated. Using several characterization techniques, including X-ray diffraction, field-emission-gun scanning electron microscopy and notably Moessbauer spectroscopy, it was possible to determine the appropriate amount of urea that allows to obtain a totally stabilized Zr{sub 0.9}Fe{sub 0.1}O{sub 1.95} solid solution. The nanocrystalline zirconia solid solution is mostly tetragonal, but the presence of the cubic phase could not be ruled out. An in-depth study of the thermal stability in air showed that the Fe{sup 3+} solubility in the stabilized solid solution starts to decrease at about 875 deg. C which results in the formation of hematite (possibly containing some Zr{sup 4+}) at the surface of the zirconia grains and further provokes the progressive transformation into the monoclinic zirconia phase.

  17. Hole Trapping at Surfaces of m?ZrO2 and m?HfO2 Nanocrystals

    SciTech Connect (OSTI)

    Wolf, Matthew J.; Mckenna, Keith P.; Shlyuger, Alexander L.

    2012-12-03

    We investigate hole trapping at the most prevalent facets of monoclinic zirconia (m-ZrO2) and hafnia (m-HfO2) nanocrystals using first-principles methods. The localization of holes at surface oxygen ions is more favorable than in the bulk crystal by up to ?1 eV. This is caused mainly by the reduction of the absolute value of the electrostatic potential at the surface ions with respect to the bulk and by the significant surface distortion caused by the hole localization. The mobility of holes at surfaces is much lower than that found in the bulk and is fairly isotropic. Unlike in cubic oxides, such as MgO and CaO, we do not find a significant driving force for preferential trapping of holes at steps on the m-ZrO2 surface. These fundamental results are relevant to mechanisms of water oxidation, photocatalysis, contact charging, and photodesorption.

  18. Electron-Transport Properties of Amorphous (Zr0.64ni0.36)1-Xalx Alloys 

    E-Print Network [OSTI]

    BHATNAGAR, AK; PAN, R.; Naugle, Donald G.

    1989-01-01

    .06 ?~x=0.15 ?x=0. 1 0 x=0.20 C; 210- 1.04- OO x =0.25~ . . ::.- -? .~x=0.05 185 . 1.02-. x=0.0~ '- 160 0.1 0.2 0.3 FIG. 2. Room-temperature (300-K) resistivity p as a function of Al concentration x for amorphous (ZrQ 64NiQ 3{j), Al... coefficient 8& for amorphous (ZrQ 64NiQ 36) ) Al . 0 0.05 0.10 0.15 0.20 0.25 0.30 Tcryst (K) 679' 747" 718" 785" 764' 792' 800' T. (K) 2.54' 2.560' 2.68g 2.05' 2.33g 1.62' 1.810 pm (g/cm ) 7.25' 7.10' 6.96' 6.73' 6.53' 6...

  19. Synthesis, structural and magnetic characterisation of the fully fluorinated compound 6H-BaFeO{sub 2}F

    SciTech Connect (OSTI)

    Clemens, Oliver; Wright, Adrian J.; Berry, Frank J.; Smith, Ronald I.; Slater, Peter R.

    2013-02-15

    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.

  20. 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.

    2012-07-01

    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)

  1. Synthesis, structural and magnetic characterisation of the fluorinated compound 15R-BaFeO{sub 2}F

    SciTech Connect (OSTI)

    Clemens, Oliver; Berry, Frank J.; Bauer, Jessica; Wright, Adrian J.; Knight, Kevin S.; Slater, Peter R.

    2013-07-15

    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.

  2. 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

  3. Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study

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

    Zhang, Y.; Mendelev, M. I.; Wang, C. Z.; Ott, R.; Zhang, F.; Besser, M. F.; Ho, K. M.; Kramer, M. J.

    2014-11-03

    Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium-range order (MRO), remains difficult to describe. Specifically lacking is an understanding of how the MRO responds to deformation and the associated changes in atomic mobility. In this paper, we focus on the impact of deformation on MRO and associated effect on diffusion in a well-relaxed Cu64.5Zr35.5 MG by molecular dynamics simulations. The Cu-Zr MG exhibits a larger elastic limit of 0.035 and a yield stress of 3.5 GPa. The cluster alignment method was employed to characterize the icosahedral short-range order (ISRO) andmore »Bergman-type medium-range order (BMRO) in the models upon loading and unloading. From this analysis, we find the disruption of both ISRO and BMRO occurs as the strain reaches about 0.02, well below the elastic limit. Within the elastic limit, the total fractions of ISRO or BMRO can be fully recovered upon unloading. The diffusivity increases six to eight times in regions undergoing plastic deformation, which is due to the dramatic disruption of the ISRO and BMRO. As a result, by mapping the spatial distributions of the mobile atoms, we demonstrate the increase in atomic mobility is due to the extended regions of disrupted ISRO and more importantly BMRO.« less

  4. Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study

    SciTech Connect (OSTI)

    Zhang, Y.; Mendelev, M. I.; Wang, C. Z.; Ott, R.; Zhang, F.; Besser, M. F.; Ho, K. M.; Kramer, M. J.

    2014-11-03

    Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium-range order (MRO), remains difficult to describe. Specifically lacking is an understanding of how the MRO responds to deformation and the associated changes in atomic mobility. In this paper, we focus on the impact of deformation on MRO and associated effect on diffusion in a well-relaxed Cu64.5Zr35.5 MG by molecular dynamics simulations. The Cu-Zr MG exhibits a larger elastic limit of 0.035 and a yield stress of 3.5 GPa. The cluster alignment method was employed to characterize the icosahedral short-range order (ISRO) and Bergman-type medium-range order (BMRO) in the models upon loading and unloading. From this analysis, we find the disruption of both ISRO and BMRO occurs as the strain reaches about 0.02, well below the elastic limit. Within the elastic limit, the total fractions of ISRO or BMRO can be fully recovered upon unloading. The diffusivity increases six to eight times in regions undergoing plastic deformation, which is due to the dramatic disruption of the ISRO and BMRO. As a result, by mapping the spatial distributions of the mobile atoms, we demonstrate the increase in atomic mobility is due to the extended regions of disrupted ISRO and more importantly BMRO.

  5. Research on Pd film deposition rate calculation and simulation based on TiZrV/Pd film coating experiment

    E-Print Network [OSTI]

    Wang, Jie; Xu, Yanhui; Wang, Yong

    2015-01-01

    The vacuum chamber of accelerator storage ring need clean ultra-high vacuum environment. TiZrV getter film which was deposited on interior wall of vacuum chamber, can realize distributed pumping, effectively improve the vacuum degree and reduce the longitudinal gradient. But accumulation of pollutants such as N2, O2, will decrease the adsorption ability of non-evaporable getter (NEG), which leads to the reduction of NEG lifetime. Therefore, NEG thin film coated with a layer of Pd which has high diffusion rate and absorption ability for H2, can extend the service life of NEG, and improve the pumping rate of H2 at the same time. With argon as discharge gas, magnetron sputtering method was adopted to prepare TiZrV-Pd film in long straight pipe. According to the experimental results of the scanning electron microscope (SEM), deposition rates of TiZrV-Pd films were analyzed under different deposition parameters, the magnetic field strength, the gas flow rate, discharge current, discharge voltage and working pressu...

  6. Influence of annealing temperature on electronic and dielectric properties of ZrO{sub 2} thin films on Si

    SciTech Connect (OSTI)

    Uthanna, S.; Kondaiah, P.; Madhavi, V.; Rao, G. Mohan [Department of Physics, Sri Venkateswara University, Tirupati - 517 502 (India); Department of Instrumentation and Applied Physics, Indian Institute of Sciences, Bangalore - 560 012 (India)

    2012-06-25

    Zirconium oxide (ZrO{sub 2}) films were deposited on (100) silicon substrates by DC reactive magnetron sputtering of zirconium target at an oxygen partial pressure of 6 Multiplication-Sign 10{sup -2} Pa. The as-deposited films were annealed in air for 1 hour at different temperatures in the range 773 - 1173 K. The influence of annealing temperature on the structural properties of ZrO{sub 2} films and the electrical properties like Capacitance-Voltage and Current-Voltage of the capacitors of the type Al/ZrO{sub 2}/p-Si were studied. The capacitance and dielectric constant of the capacitors were found to increase with increase in annealing temperature from 773 to 973 K, however, with further increase in annealing temperature to 1173 K they were found to decrease. In addition, the leakage current density was decreased from 1 Multiplication-Sign 10{sup -6} to 4 Multiplication-Sign 10{sup -7} A/cm{sup 2} at 1V gate bias voltage and the electrical conduction mechanism was dominated by Schottky emission for all the films in lower electric fields.

  7. 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

  8. Crystal structure and physical properties of quaternary clathrates Ba{sub 8}Zn{sub x}Ge{sub 46-x-y}Si{sub y}, Ba{sub 8}(Zn,Cu){sub x}Ge{sub 46-x} and Ba{sub 8}(Zn,Pd){sub x}Ge{sub 46-x}

    SciTech Connect (OSTI)

    Nasir, Navida; Grytsiv, Andriy; Melnychenko-Koblyuk, Nataliya [Institute of Physical Chemistry, University of Vienna, A-1090 Wien (Austria); Rogl, Peter, E-mail: peter.franz.rogl@univie.ac.a [Institute of Physical Chemistry, University of Vienna, A-1090 Wien (Austria); Bednar, Ingeborg; Bauer, Ernst [Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien (Austria)

    2010-10-15

    Three series of vacancy-free quaternary clathrates of type I, Ba{sub 8}Zn{sub x}Ge{sub 46-x-y}Si{sub y}, Ba{sub 8}(Zn,Cu){sub x}Ge{sub 46-x}, and Ba{sub 8}(Zn,Pd){sub x}Ge{sub 46-x}, have been prepared by reactions of elemental ingots in vacuum sealed quartz at 800 {sup o}C. In all cases cubic primitive symmetry (space group Pm3n, a{approx}1.1 nm) was confirmed for the clathrate phase by X-ray powder diffraction and X-ray single crystal analyses. The lattice parameters show a linear increase with increase in Ge for Ba{sub 8}Zn{sub x}Ge{sub 46-x-y}Si{sub y}. M atoms (Zn, Pd, Cu) preferably occupy the 6d site in random mixtures. No defects were observed for the 6d site. Site preference of Ge and Si in Ba{sub 8}Zn{sub x}Ge{sub 46-x-y}Si{sub y} has been elucidated from X-ray refinement: Ge atoms linearly substitute Si in the 24k site whilst a significant deviation from linearity is observed for occupation of the 16i site. A connectivity scheme for the phase equilibria in the 'Ba{sub 8}Ge{sub 46}' corner at 800 {sup o}C has been derived and a three-dimensional isothermal section at 800 {sup o}C is presented for the Ba-Pd-Zn-Ge system. Studies of transport properties carried out for Ba{sub 8{l_brace}}Cu,Pd,Zn{r_brace}{sub x}Ge{sub 46-x} and Ba{sub 8}Zn{sub x}Si{sub y}Ge{sub 46-x-y} evidenced predominantly electrons as charge carriers and the closeness of the systems to a metal-to-insulator transition, fine-tuned by substitution and mechanical processing of starting material Ba{sub 8}Ge{sub 43}. A promising figure of merit, ZT {approx}0.45 at 750 K, has been derived for Ba{sub 8}Zn{sub 7.4}Ge{sub 19.8}Si{sub 18.8}, where pricey germanium is exchanged by reasonably cheap silicon. - Graphical abstract: Quaternary phase diagram of Ba-Pd-Zn-Ge system at 800 {sup o}C.

  9. Austronesians in Papua: Diversification and Change in South-Halmahera-West New Guinea

    E-Print Network [OSTI]

    Kamholz, David

    2014-01-01

    lightning’ (R) RA: Biga ba?ni ‘fly (insect)’ (R); Fiawat benyuw ‘fly (insect)’ (R) CB: Umar bar ‘ball’ (

  10. ANNUITY(RA) RETIREMENTANNUITY

    E-Print Network [OSTI]

    Subramanian, Venkat

    (SRA)/GROUP SUPPLEMENTAL RETIREMENTANNUITY (GSRA) Contributions accepted from . . . Your employer, employee salary reduction (pre-tax)*, and employee salary deduction (after-tax) Your employer, employee salary reduction (pre-tax)*, and employee salary deduction (after-tax) Additional employee salary reduction only Some

  11. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i nAand DOE SafetyofDepartment. " 21 ran

  12. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal GasAdministration Medal01 Sandia NationalSecurityNuclearH-canyon |I 14/%2A en DOE/NNSA

  13. Four-point-bending-fatigue behavior of the Zr-based Vitreloy 105 bulk metallic glass

    SciTech Connect (OSTI)

    Morrison, M. L. [University of Tennessee, Knoxville (UTK); Buchanan, R. A. [University of Tennessee, Knoxville (UTK); Liaw, Peter K [University of Tennessee, Knoxville (UTK); Green, B. A. [University of Tennessee, Knoxville (UTK); Wang, G Y [University of Tennessee, Knoxville (UTK); Liu, Chain T [ORNL; Horton Jr, Joe A [ORNL

    2007-01-01

    The purpose of this study was to make a direct comparison between four-point-bending and uniaxial fatigue tests with the Zr{sub 52.5}Cu{sub 17.9}Ni{sub 14.6}Al{sub 10.0}Ti{sub 5.0} (at.%) BMG alloy (Vitreloy 105). The fatigue lifetimes in four-point bending were found to be greater than those reported in uniaxial testing. However, the fatigue-endurance limit found in four-point bending was slightly less than that reported for uniaxial fatigue. Thus, the significant differences between fatigue studies in the literature are not likely due to this difference in testing geometry. On the contrary, the fatigue lifetimes were found to be highly dependent upon surface defects and material quality. The four-point-bending-fatigue performance of the Vit 105 alloy was found to be greater than most BMGs and similar to the 300 M high-strength steel and other crystalline alloys in spite of not being 'perfectly amorphous.' Due to the detrimental effects of these inhomogeneities and wear at the supporting pins, this fatigue behavior can be assumed to be a conservative estimate of the potential fatigue performance of a perfectly amorphous and homogeneous BMG.

  14. Wettability of brazing alloys on molybdenum and TZM (Mo-Ti-Zr alloy)

    SciTech Connect (OSTI)

    McDonald, M.M.; Keller, D.L.; Heiple, C.R.; Hofmann, W.E.

    1988-01-01

    Vacuum brazing studies have been performed on molybdenum and TZM (0.5Ti-0.08Zr-Mo). Wettability tests have been conducted for nineteen braze metal filler alloys on molybdenum and thirty-two braze metal filler alloys on TZM over a wide range of temperatures. A wetting index, which is a function of contact angle and braze alloy contact area, was determined for each filler alloy at each brazing temperature. The nature and extent of interaction between the brazing alloys and the base metals was analyzed by conventional metallography, scanning-electron microscopy, and electron microprobe analysis. A comparison is made between the behavior of filler alloys on molybdenum and TZM -- filler alloys consistently exhibited less wettability on TZM than on molybdenum. The lower wettability of TZM is believed to be due to a small amount of titanium in the surface oxide on TZM. Cracking was observed in the base metal under some of the high temperature braze deposits. The cracking is shown to arise from liquid metal embrittlement from nickel in the high temperature braze alloys. 7 refs., 11 figs., 2 tabs.

  15. Origin of high Li? conduction in doped Li?La?Zr?O?? garnets

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

    Chen, Yan; Rangasamy, Ezhiylmurugan; Liang, Chengdu; An, Ke

    2015-08-06

    Substitution of a native ion in the crystals with a foreign ion that differs in valence (aliovalent doping) has been widely attempted to upgrade solid-state ionic conductors for various charge carriers including O²?, H?, Li?, Na?, etc. The doping helps promote the high-conductive framework and dredge the tunnel for fast ion transport. The garnet-type Li?La?Zr?O?? (LLZO) is a fast Li? solid conductor, which received much attention as an electrolyte candidate for all-solid-state lithium ion batteries, showing great potential to offer high energy density and minimize battery safety concerns to meet extensive applications in large energy storage systems such as thosemore »for electric vehicles and aerospace. In the Li-stuffed garnet framework of LLZO, the 3D pathway formed by the incompletely occupied tetrahedral sites bridged by a single octahedron enables the superior Li? conductivity. For optimal performance, many aliovalent-doping efforts have been made throughout metal elements (Al³?, Ta??) and metalloid elements (Ga³?, Te??) in the periodic table with various valences to stabilize the high-conductive phase and increase the Li vacancy concentration.« less

  16. Stress-corrosion fatigue-crack growth in a Zr-based bulk amorphousmetal

    SciTech Connect (OSTI)

    Schroeder, V.; Ritchie, R.O.

    2005-09-21

    Electrochemical and mechanical experiments were conducted to analyze the environmentally-influenced cracking behavior of a bulk amorphous metal, Zr41.2Ti13.8Cu12.5Ni10Be22.5. This study was motivated by a scientific interest in mechanisms of fatigue-crack propagation in an amorphous metal, and by a practical interest in the use of this amorphous metal in applications that take advantage of its unique properties, including high specific strength, large elastic strains and low damping. The objective of the work was to determine the rate and mechanisms of subcritical crack growth in this metallic glass in an aggressive environment. Specifically, fatigue-crack propagation behavior was investigated at a range of stress intensities in air and aqueous salt solutions by examining the effects of loading cycle, stress-intensity range, solution concentration, anion identity, solution de-aeration, and bulk electrochemical potential. Results indicate that crack growth in aqueous solution in this alloy is driven by a stress-assisted anodic reaction at the crack tip. Rate-determining steps for such behavior are reasoned to be electrochemical, stress-dependent reaction at near-threshold levels, and mass transport at higher (steady-state) growth rates.

  17. Origin of high Li? conduction in doped Li?La?Zr?O?? garnets

    SciTech Connect (OSTI)

    Chen, Yan [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rangasamy, Ezhiylmurugan [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Liang, Chengdu [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); An, Ke [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2015-01-01

    Substituting a native ion in the crystals with a foreign ion that has a difference in valence, termed as aliovalent doping, has been widely attempted to upgrade solid-state ionic conductors for various charge carriers including O²?, H?, Li?, Na?, and so forth.(1-4) The doping aids to promote the high-conductive framework and dredge the tunnel for fast ion transport. The garnet-type Li?La?Zr?O?? (LLZO) is a fast Li? solid conductor, which received vast attention as an electrolyte candidate for all-solid-state lithium ion batteries, showing great potential to offer high energy density and minimize battery safety concerns to meet extensive applications in large energy storage systems such as electric vehicles and aerospace.(5-8) In the Li-stuffed garnet framework of LLZO, the 3D pathway formed through the incompletely occupied tetrahedral sites bridged by a single octahedron enables the superior Li? conductivity.(9, 10) For the purpose of optimal performance, many efforts of aliovalent doping have been made throughout metal elements (Al³?, Ta??) and metalloid elements (Ga³?, Te??) in the periodic table with various valences(11-14) to stabilize the high-conductive phase and increase the Li vacancy concentration.(7, 10, 15)

  18. Formation of a shock deformation induced {omega} phase in Zr 20 Nb alloy

    SciTech Connect (OSTI)

    Dey, G.K.; Tewari, R.; Banerjee, S. . E-mail: sbanerji@magnum.barc.ernet.in; Jyoti, G.; Gupta, S.C.; Joshi, K.D.; Sikka, S.K.

    2004-10-18

    The formation of a plate shaped {omega} phase in Zr-Nb alloy after shock deformation has been studied with a view to ascertaining the nature of this transformation. The orientation relationship between the {beta} and the {omega} lattices was {l_brace}111{r_brace}{sub {beta}}//(0001){sub {omega}} and <11-bar 0>{beta}//<112-bar 0>{omega} which is identical to that seen in case of {omega} phase forming in this alloy on thermal treatment. The experimentally determined habit plane of the plate shaped {omega} phase has been compared with that predicted from the phenomenological theory of martensite formation. A mechanism of transformation involving shear on the <112> planes has been considered. The importance of mechanical instability of the {beta} phase in bringing about this transformation has been investigated. The mechanism of initiation of {omega} transformation has been ascertained by high resolution electron microscopy (HREM) of the {beta} lattice and compared with that happening during {omega} formation in the same alloy by thermal treatment.

  19. Data:3dfe9516-886e-413a-baed-ae8390939e0b | Open Energy Information

    Open Energy Info (EERE)

    dfe9516-886e-413a-baed-ae8390939e0b No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading......

  20. 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.; Sohn, Egon; Hoon Kim, Kee

    2014-01-13

    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.

  1. Synthesis, crystal structure, and properties of the rhombohedral modification of the thiospinel CuZr{sub 1.86(1)}S{sub 4}

    SciTech Connect (OSTI)

    Dong, Yongkwan; McGuire, Michael A.; Yun, Hoseop; DiSalvo, Francis J.

    2010-03-15

    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}-R3-barm (no. 166, a=7.3552(2) A, c=35.832(2) A, V=1678.76(13) A{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. - Graphical abstract: The projected view of the rhombohedral modification, CuZr{sub 1.86(1)}S{sub 4}, down the [100] direction. Large letters denote the packing sequence of the S atoms (yellow circles) along the c axis. Zr (black circles) and Cu (red circles) atoms occupy the octahedral and tetrahedral holes, respectively, between close packed S layers.

  2. Optical properties of Pr-doped BaY{sub 2}F{sub 8}

    SciTech Connect (OSTI)

    Andrade, Adriano B. Mello, Ana C. S. de; Valerio, Mário E. G.; Rezende, Marcos V. dos S.; Baldochi, Sonia L.

    2014-08-07

    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.

  3. Platform Deformation Refined Pointing and Phase Correction for the AMiBA Hexapod Telescope

    E-Print Network [OSTI]

    Koch, Patrick M; Chang, Yu-Yen; Huang, Yau-De; Raffin, Philippe; Chen, Ke-Yung; Chereau, Guillaume; Chen, Ming-Tang; Ho, Paul T P; Huang, Chih-Wie; Ibanez-Romano, Fabiola; Jiang, Homin; Liao, Yu-Wei; Lin, Kai-Yang; Liu, Guo-Chin; Molnar, Sandor M; Nishioka, Hiroaki; Umetsu, Keiichi; Wang, Fu-Cheng; Wu, Jiun-Huei Proty; Altamirano, Pablo; Chang, Chia-Hao; Chang, Shu-Hao; Chang, Su-Wei; Han, Chi-Chiang; Kubo, Derek; Li, Chao-Te; Martin-Cocher, Pierre; Oshiro, Peter

    2009-01-01

    The Array for Microwave Background Anisotropy (AMiBA) is a radio interferometer for research in cosmology, currently operating 7 0.6m diameter antennas co-mounted on a 6m diameter platform driven by a hexapod mount. AMiBA is currently the largest hexapod telescope. We briefly summarize the hexapod operation with the current pointing error model. We then focus on the upcoming 13-element expansion with its potential difficulties and solutions. Photogrammetry measurements of the platform reveal deformations at a level which can affect the optical pointing and the receiver radio phase. In order to prepare for the 13-element upgrade, two optical telescopes are installed on the platform to correlate optical pointing tests. Being mounted on different locations, the residuals of the two sets of pointing errors show a characteristic phase and amplitude difference as a function of the platform deformation pattern. These results depend on the telescope's azimuth, elevation and polarization position. An analytical model ...

  4. Structural consideration on the emission properties of Eu²?-doped Ba(Sr, Ca)?MgSi?O?

    SciTech Connect (OSTI)

    Yonesaki, Yoshinori, E-mail: yonesaki@yamanashi.ac.jp [Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae 7-32, Kofu 400-8511 (Japan)

    2013-05-01

    Emission properties of Eu²?-doped Ba(Sr, Ca)?MgSi?O? are discussed in terms of the crystal structure refined by Rietveld method. Ba(Sr, Ca)?MgSi?O? has glaserite-type layered structure. In response to Sr/(Sr+Ca) ratio, the layer-framework build up by corner-sharing of MgO? octahedra and SiO? tetrahedra twists around C? axes to match the size of B-site cation (Sr²?/Ca²?). This twist significantly affects the unit cell size and the coordination environment around B-site. Eu²?-doped Ba(Sr, Ca)?MgSi?O? exhibited blue emission under ultraviolet irradiation. The emission spectra have been characterized by two emission components derived from Eu²? ions occupying A- and B-site. Both components showed similar wavelength shift for different Sr/(Sr+Ca), in response to Si–O? polarization and to the structural change. - Graphical abstract: Emission properties of Eu²?-doped Ba(Sr, Ca)?MgSi?O? are discussed in terms of the crystal structure refined by Rietveld method. Highlights: • Glaserite-type Ba(Sr, Ca)?MgS?O? has been prepared by a solid state reaction. • Ba(Sr, Ca)?MgSi?O? changes the crystal structure, depending on Sr/(Sr+Ca) ratio. • Eu²?-doped Ba(Sr, Ca)?MgSi?O? exhibits blue emission under ultraviolet irradiation. • Emission from Ba(Sr, Ca)?MgSi?O? is characterized by two Eu²? emission components. • The two emissions show wavelength shift in a similar manner against Sr/(Sr+Ca)

  5. Two- and Three-Body Charmless B Decays at BaBar

    SciTech Connect (OSTI)

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

    2012-04-05

    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. Dielectric investigations in nanostructured tetragonal BaTiO{sub 3} ceramics

    SciTech Connect (OSTI)

    Silveira, L.G.D.; Alves, M.F.S.; Cótica, L.F.; Gotardo, R.A.M.; Nascimento, W.J.; Garcia, D.; Eiras, J.A.; Santos, I.A.

    2013-05-15

    Highlights: ? Nanostructured BaTiO{sub 3} ceramics processed by an innovative protocol. ? Dielectric relaxations related to strains and vacancies. ? Dielectric and ferroelectric properties enhanced by strain. - Abstract: In this paper, structural and dielectric properties of BaTiO{sub 3} ceramics obtained under extreme conditions were investigated. The temperature dependent dielectric investigations revealed that the phase transition temperatures of the BaTiO{sub 3} ceramics were raised as a function of residual strains associated to the nanostructuration, while structural characterizations showed a tetragonal arrangement at room temperature. From the frequency dependence analyses of the imaginary parts of dielectric permittivity, impedance and modulus function, three relaxation processes were identified. Two of them exhibit activation energies of 0.45 and 0.63 eV, and were attributed to single and double-ionization of oxygen vacancies. The whole set of results also indicated that the electrons resulting from the ionization of oxygen vacancies are trapped and do not contribute to the electrical conductivity, while the physical properties of the analyzed samples were enhanced by retaining a strained microstructure.

  7. Growth and self-assembly of BaTiO{sub 3} nanocubes for resistive switching memory cells

    SciTech Connect (OSTI)

    Chu, Dewei, E-mail: D.Chu@unsw.edu.au [School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW (Australia); Lin, Xi; Younis, Adnan [School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW (Australia); Li, Chang Ming [Chongqing Key Lab for Advanced Materials and Clean Energies of Techonologies Dean, Institute for Clean Energy and Advanced Materials, Southwest University, Chongqing (China); Dang, Feng [Research Center for Materials Back Casting Technology (MBT Center), Nagoya University, Nagoya 464-8603 (Japan); Li, Sean [School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW (Australia)

    2014-06-01

    In this work, the self-assembled BaTiO{sub 3} nanocubes based resistive switching memory capacitors are fabricated with hydrothermal and drop-coating approaches. The device exhibits excellent bipolar resistance switching characteristics with ON/OFF ratio of 58–70, better reliability and stability over various polycrystalline BaTiO{sub 3} nanostructures. It is believed that the inter cube junctions is responsible for such a switching behaviour and it can be described by the filament model. The effect of film thickness on switching ratio (ON/OFF) was also investigated in details. - Graphical abstract: This work describes a novel resistive switching memory cell based on self-assembled BaTiO{sub 3} nanocubes. - Highlights: • BaTiO{sub 3} nanocubes were prepared by one step facile hydrothermal method. • Self-assembled BaTiO{sub 3} nanocubes thin films were obtained by drop-coating approach. • The BaTiO{sub 3} nanocubes show excellent resistive switching properties for memory applications.

  8. Grid of theoretical NLTE equivalent widths of four Ba II lines and barium abundance in cool stars

    E-Print Network [OSTI]

    Korotin, S A; Hansen, C J; Caffau, E; Bonifacio, P; Spite, M; Spite, F; Francois, P

    2015-01-01

    We present a grid of computed non-local thermodynamic equilibrium (NLTE) equivalent widths (EW) and NLTE abundance corrections for four Ba II lines: 4554, 5853, 6141, and 6496 A. The grid can be useful in deriving the NLTE barium abundance in stars having parameters in the following ranges: effective temperature from 4000 K to 6500 K, surface gravity log g from 0 to 5, microturbulent velocity 0 km s^-1 to 3 km s^-1, metallicity [Fe/H] from -2 to +0.5, and [Ba/Fe] from -0.4 to +0.6. The NLTE abundance can be either derived by EW interpolation (using the observed Ba II line EW) or by using the NLTE correction applied to a previously determined LTE abundance. Ba II line equivalent widths and the NLTE corrections were calculated using the updated MULTI code and the Ba II atomic model that was previously applied to determine the NLTE barium abundance in different types of stars. The grid is available on-line through the web, and we find that the grid Ba NLTE corrections are almost as accurate as direct NLTE profil...

  9. Synthesis, Crystal Structure, and Properties of the Rhomboheral Modification of the Thiospinel CuZr1.86(1)S4

    SciTech Connect (OSTI)

    Dong, Yongkwan; McGuire, Michael A; Hoseop, Yun; DiSalvo, Francis J.

    2009-01-01

    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.

  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)

    2013-12-15

    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. 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; Roehr, Caroline

    2012-12-15

    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.

  12. The Department of Energy's Weatherization Assistance Program under the American Recovery and Reinvestment Act in the State of Missouri (OAS-RA-11-11)

    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 on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState of Pennsylvania OAS-RA-L-11-11RenewableUseU.S.Missouri

  13. Analysis of wear track and debris of stir cast LM13/Zr composite at elevated temperatures

    SciTech Connect (OSTI)

    Panwar, Ranvir Singh, E-mail: ranvir.panwar@thapar.edu; Pandey, O.P., E-mail: oppandey@thapar.edu

    2013-01-15

    Particulate reinforced aluminum metal matrix composite is in high demand in automobile industry where the operational conditions vary from low to high temperature. In order to understand the wear mode at elevated temperature, this study was planned. For this purpose we developed a metal matrix composite containing aluminum alloy (LM13) as matrix and zircon sand as particulate reinforcement by stir casting process. Different amounts of zircon sand (5, 10, 15 and 20 wt.%) were incorporated in the matrix to study the effect of reinforcement on the wear resistance. Dispersion of zircon sand particles in the matrix was confirmed by using optical microscopy. Sliding wear tests were done to study the durability of the composite with respect to the base alloy. The effects of load and temperature on wear behavior from room temperature to 300 Degree-Sign C were studied to understand the wear mechanism deeply. Surface morphology of the worn surfaces after the wear tests as well as wear debris was observed under scanning electron microscope. Mild to severe wear transition was noticed in tests at high temperature and high load. However, there is interesting change in wear behavior of the composite near the critical temperature of the composite. All the observed behavior has been explained with reference to the observed microstructure of the wear track and debris. - Highlights: Black-Right-Pointing-Pointer Good interfacial bonding between zircon sand particles and Al matrix was observed. Black-Right-Pointing-Pointer The effect of temperature on the wear behavior of LM13/Zr composites was studied. Black-Right-Pointing-Pointer Wear resistance of the composite was improved with addition of zircon sand. Black-Right-Pointing-Pointer Transition temperature from mild to severe wear also improved in composite. Black-Right-Pointing-Pointer SEM analysis of the tracks and debris was done to establish wear mechanism.

  14. 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)

    2005-12-16

    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.

  15. Germanium-induced stabilization of a very high-k zirconia phase in ZrO{sub 2}/GeO{sub 2} gate stacks

    SciTech Connect (OSTI)

    Tsipas, P.; Volkos, S. N.; Sotiropoulos, A.; Galata, S. F.; Mavrou, G.; Tsoutsou, D.; Panayiotatos, Y.; Dimoulas, A.; Marchiori, C.; Fompeyrine, J.

    2008-08-25

    Electrical data on ZrO{sub 2}/GeO{sub 2} stacks prepared by atomic oxygen beam deposition on Ge at 225 deg. C reveal a relatively weak dependence of the stack equivalent oxide thickness upon the ZrO{sub 2} thickness. This trend points to a very high zirconia dielectric permittivity (k) value which is estimated to be around 44. This is indicative of zirconia crystallization into a tetragonal phase which is also supported by x-ray diffraction data. X-ray photoelectron spectroscopy analysis is in line with the assumption that due to a finite GeO{sub 2} decomposition, Ge is incorporated into the growing ZrO{sub 2}, thus, stabilizing the high-k tetragonal phase.

  16. Improved Figure of Merit of (Ba,Sr)TiO3-Based Ceramics by Sn Substitution Jong-Yoon Ha, Liwei Lin, Dae-Yong Jeong1

    E-Print Network [OSTI]

    Lin, Liwei

    Improved Figure of Merit of (Ba,Sr)TiO3-Based Ceramics by Sn Substitution Jong-Yoon Ha, Liwei Lin properties of (Ba0:6Sr0:4)(Ti1Àx Snx )O3 (0 x 0:3) ceramics were investigated. Single-phase specimens having for Ti4þ , up to 30 mol %, on ferroelectric properties and dielectric tunability of ceramics in the Ba0

  17. 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)

    2008-08-07

    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.

  18. Reaction dynamics and photochemistry of divalent systems. [Reaction of Ba with NO sub 2 , H sub 2 O, methanol, ClO sub 2 , O sub 3; photodissociation of NO sub 3 radical and OClO

    SciTech Connect (OSTI)

    Davis, H.F.

    1992-05-01

    Results are presented of molecular beam studies of bimolecular and unimolecular reactions of Ba. Chapter 1 discusses the reaction Ba + NO{sub 2}. Formation of the dominant BaO({sup 1}{Sigma}) + NO products resulted primarily from decay of long-lived Ba{sup +}NO{sub 2}{sup {minus}} collision complexes. Secondary mechanisms led to formation of forward scattered, internally excited BaO, and BaNO + O. D{sub o}(Ba-NO) = 65{plus minus}20 kcal/mol. Reactions of ground state and electronically excited Ba with water and alcohols are examined in Chapter 2. Reaction of Ba({sup 1}S) + H{sup 2}O led to BaO + H{sub 2}, whereas excited state Ba({sup 1}D) + H{sub 2}O reacted to form BaOH + H. Collisions between Ba and CH{sub 3}OH led to BaOCH{sub 3} + H. Radical channels involve H-atom migration and are promoted by excitation of the incident Ba atom. In Chapter 3, reactions of Ba({sup 1}S) with ClO{sub 2}2 and O{sub 3} are discussed. Again, direct and complex mechanisms were observed. Formation of BaCl + O{sub 2} from decomposition of Ba{sup +}ClO{sub 2}{sup {minus}} accounted for 10% of total reaction crass section. Although Ba + O{sub 3} {yields} BaO + 0{sub 2} occurs primarily by direct reaction mechanisms, the secondary channel Ba + 0{sub 3} {yields} BaO{sub 2} + 0 involved decay of long lived Ba{sup +}O{sub 3}{sup {minus}} intermediates. D{sub o}(Ba{minus}O{sub 2}) = 120 {plus minus}20 kcal/mol. Photodissociation dynamics of NO{sub 3} is explored in chapter 4. Visible excitation leads to formation of NO + 0{sub 2} and NO{sub 2} + O. Wavelength dependence of branching ratios is investigated. D{sub o}(O-NO{sub 2}) = 48.55 kcal/mole ;and calculate {Delta}H{sub f}(NO{sub 3}) = 17.75 kcal/mole (298K). Chapter 5 discusses the photodissociation of OClO in a molecular beam. Although ClO({sup 2}II) + O({sup 3}P) is dominant, Cl({sup 2}P) + O{sub 2} also forms, with a max yield of 3.9{plus minus}0.8% near 404nm.

  19. Facile synthesis of Ba1-xKxFe?As? superconductors via hydride route

    SciTech Connect (OSTI)

    Zaikina, Julia V. [Univ. of California at Davis, Davis, CA (United States); Batuk, Maria [Univ. of Antwerp, Antwerp (Belgium); Abakumov, Artem M. [Univ. of Antwerp, Antwerp (Belgium); Navrotsky, Alexandra [Univ. of California at Davis, Davis, CA (United States); Kauzlarich, Susan M. [Univ. of California at Davis, Davis, CA (United States)

    2014-12-03

    We have developed a fast, easy, and scalable synthesis method for Ba1-xKxFe?As? (0 ? x ? 1) superconductors using hydrides BaH? and KH as a source of barium and potassium metals. Synthesis from hydrides provides better mixing and easier handling of the starting materials, consequently leading to faster reactions and/or lower synthesis temperatures. The reducing atmosphere provided by the evolved hydrogen facilitates preparation of oxygen-free powders. By a combination of methods we have shown that Ba1-xKxFe?As? obtained via hydride route has the same characteristics as when it is prepared by traditional solid-state synthesis. Refinement from synchrotron powder X-ray diffraction data confirms a linear dependence of unit cell parameters upon K content as well as the tetragonal to orthorhombic transition at low temperatures for compositions with x < 0.2. Magnetic measurements revealed dome-like dependence of superconducting transition temperature Tc upon K content with a maximum of 38 K for x close to 0.4. Electron diffraction and high-resolution high-angle annular dark-field scanning transmission electron microscopy indicates an absence of Ba/K ordering, while local inhomogeneity in the Ba/K distribution takes place at a scale of several angstroms along [110] crystallographic direction.

  20. PIN Photodiodes for Radiation Monitoring and Protection in the BaBar Silicon Vertex Tracker

    E-Print Network [OSTI]

    Babar Collaboration; T. I. Meyer

    2000-10-23

    We discuss the design, implementation and performance of the radiation monitoring and protection system used by the Silicon Vertex Tracker (SVT) in the BaBar detector. Using 12 reverse-biased PIN photodiodes mounted around the beampipe near the IP, we are able to provide instantaneous radiation dose rates, absorbed dose integrals, and active protection that aborts the circulating beams in the PEP-II storage ring when radiation levels exceed user-defined thresholds. The system has reliably protected the SVT from excessive radiation damage and has also served as a key diagnostic tool in understanding radiation backgrounds at PEP-II.

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

    E-Print Network [OSTI]

    Hegg, Turi

    1989-01-01

    -Cu ? 0 Febr. 1988 Jan. 1988 Febr. 1987 80 liquid N2 80 40 20 Pb Hg La-Sr ? Cu ? 0 NbaGe Nb- Al- Ge NbN Nb0 NQSn Nb Jan. 1987 (under pressure) Dec. 1988 April 1986 ~ La-Ba-Cu-0 Jan. 1988 0 1910 1930 1950 1970 1990 Figure 7... time temperature transforma- tion (TTT) diagram in air, as shown in Figure 14, which shape suggests that / / ORTHORHOMBIC g / E IZ + 10' cc n. Z X 0 X = 6. 8 / TETRAGONAL 0 P ~ / / / / 10 2 6. 6/ 66 64 63 62 I 0 OM I 6. 1 500 600...

  2. Test of internal-conversion theory with measurements in Cs-134 and Ba-137 

    E-Print Network [OSTI]

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

    2007-01-01

    REVIEW C 75, 024308 (2007) Test of internal-conversion theory with measurements in 134Cs and 137Ba N. Nica,* J. C. Hardy, V. E. Iacob, and W. E. Rockwell? Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA M. B... interfering activity after activation. We tested three pure chemicals as candidates for our neutron-activation sample: CsCl (99.999%+), CsNO3 (99.999%), and Cs2CO3 (99.995%). We placed 0.05-ml drops of aqueous solutions of a weighed quantity of each...

  3. A reliable method for recycling (RE)-Ba-Cu-O (RE: Sm, Gd, Y) bulk superconductors

    E-Print Network [OSTI]

    Shi, Yunhua; Namburi, Devendra Kumar; Wang, Miao; Durrell, John; Dennis, Anthony; Cardwell, David

    2015-06-10

    for recycling any failed (RE)BCO sample by replenishing the liquid phase lost during the primary growth process without first reprocessing the failed samples into powders. To date, we have successfully recycled 58 bulk (RE)-Ba-Cu-O (RE: Sm, Gd, Y) samples... failed, (RE)BCO-Ag bulk samples using an infiltration growth strategy without the need to first reprocess the failed samples into powder form. We believe that the technique relies on the provision of replacement liquid phase to the failed YBCO samples...

  4. B Decays to Hadronic States with Charm/Charmonium in BaBar

    E-Print Network [OSTI]

    Vuagnin, G

    2003-01-01

    In this paper the studies of three different B decays to hadronic states are presented. These results are based on 1999-2003 dataset collected by the BaBar experiment at the PEP-II e+e- storage ring at the Stanford Linear Accelerator Center. The measurements are the hadronic branching fraction of B+ -> J/psi p Lambda-bar, B0 -> J/psi p p-bar, B0 -> D*+D-, and the direct CP-asymmetry in B0 -> D0(CP) K- channels.

  5. Charm Mixing from BaBar (Conference) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing Bacteria (TechnicalTransmission,TextitSciTech ConnectCharm Mixing from BaBar

  6. Charm Mixing, CP Violation and Rare D**0 Decays at BaBar (Conference) |

    Office of Scientific and Technical Information (OSTI)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing Bacteria (TechnicalTransmission,TextitSciTech ConnectCharm Mixing from BaBarSciTech

  7. Laser shock peening on Zr-based bulk metallic glass and its effect on plasticity: Experiment and modeling

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

    Cao, Yunfeng; Xie, Xie; Antonaglia, James; Winiarski, Bartlomiej; Wang, Gongyao; Shin, Yung C.; Withers, Philip J.; Dahmen, Karin A.; Liaw, Peter K.

    2015-05-20

    The Zr-based bulk metallic glasses (BMGs) are a new family of attractive materials with good glass-forming ability and excellent mechanical properties, such as high strength and excellent wear resistance, which make them candidates for structural and biomedical materials. Although the mechanical behavior of BMGs has been widely investigated, their deformation mechanisms are still poorly understood. In particular, their poor ductility significantly impedes their industrial application. In the present work, we show that the ductility of Zr-based BMGs with nearly zero plasticity is improved by a laser shock peening technique. Moreover, we map the distribution of laser-induced residual stresses via themore »micro-slot cutting method, and then predict them using a three dimensional finite-element method coupled with a confined plasma model. Reasonable agreement is achieved between the experimental and modeling results. The analysis of serrated flow reveals plentiful and useful information of the underlying deformation process. As a result, our work provides an easy and effective way to extend the ductility of intrinsically-brittle BMGs, opening up wider applications of these materials.« less

  8. Electron-stimulated desorption from polished and vacuum fired 316LN stainless steel coated with Ti-Zr-Hf-V

    SciTech Connect (OSTI)

    Malyshev, Oleg B. Valizadeh, Reza; Hogan, Benjamin T.; Hannah, Adrian N.

    2014-11-01

    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.

  9. 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; Norberg, Stefan T.; Ahmed, Istaq; Eriksson, Sten G.; Mohn, Chris E.

    2011-11-15

    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.

  10. Long-range magnetic ordering in Ba{sub 2}CoS{sub 3}: A neutron diffraction study

    SciTech Connect (OSTI)

    Headspith, D.A. [Department of Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX (United Kingdom); Battle, P.D. [Inorganic Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QR (United Kingdom); Francesconi, M.G. [Department of Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX (United Kingdom)], E-mail: m.g.francesconi@hull.ac.uk

    2007-10-15

    Neutron powder diffraction has been used to determine the magnetic structure of the quasi-one-dimensional compound Ba{sub 2}CoS{sub 3}, which contains linear [001] chains of vertex-sharing CoS{sub 4} tetrahedra, spaced apart by Ba{sup 2+} cations. At 1.5 K the Co{sup 2+} cations in the chains are antiferromagnetically ordered with an ordered magnetic moment of 1.97(4) {mu}{sub B} per cation aligned along [100]. Each Co{sup 2+} cation is ferromagnetically aligned with four cation in neighbouring chains and antiferromagnetically aligned with two others. - Graphical abstract: Neutron powder diffraction has been used to prove that Ba{sub 2}CoS{sub 3} shows long-range antiferromagnetic order at low temperatures, despite the quasi-one-dimensional arrangement of the CoS{sub 4} tetrahedra in the crystal structure.

  11. Structural and magnetic phase transitions near optimal superconductivity in BaFe2(As1-xPx)2

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

    Hu, Ding; Lu, Xingye; Zhang, Wenliang; Luo, Huiqian; Li, Shiliang; Wang, Peipei; Chen, Genfu; Han, Fei; Banjara, Shree R.; Sapkota, A.; et al

    2015-04-17

    We use nuclear magnetic resonance (NMR), high-resolution x-ray and neutron scattering to study structural and magnetic phase transitions in phosphorus-doped BaFe2(As1-xPx)2. Thus, previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at x = 0.3. However, we show that the tetragonal-to-orthorhombic structural (Ts) and paramagnetic to antiferromagnetic (AF, TN ) transitions in BaFe2(As1-xPx)2 are always coupled and approach to TN ? Ts ? Tc (? 29 K) for x = 0.29 before vanishing abruptly for x ? 0.3. These results suggest that AFmore »order in BaFe2(As1-xPx)2 disappears in a weakly first order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.« less

  12. Reversible Electrochemical Insertion of Lithium into Type I Ba8AlySi46-y Clathrate

    SciTech Connect (OSTI)

    Li, Ying [Arizona State University; Raghavan, Rahul [Arizona State University; Wagner, Nicholas [Arizona State University; Davidowski, Stephen [Arizona State University; Baggetto, Loic [ORNL; Zhao, Ran [Arizona State University; Cheng, Qian [Arizona State University; Holland, Gregory p [Arizona State University; Yarger, Jeffery L [Arizona State University; Veith, Gabriel M [ORNL; Ellis-Terrell, Carol [Southwest Research Institute, San Antonio; Miller, Michael A [Southwest Research Institute, San Antonio; Chan, Kwai [Southwest Research Institute, San Antonio; Chan, Candace [Arizona State University

    2015-01-01

    Silicon clathrates contain cage-like structures that can encapsulate various guest atoms or molecules. Here we present an electrochemical evaluation of type I silicon clathrates based on Ba8AlySi46-y for the anode material in lithium-ion batteries. Post-cycling characterization with NMR and XRD show no discernible structural or volume changes even after electrochemical insertion of 44 Li into the clathrate structure. The observed properties are in stark contrast with lithiation of other silicon anodes, which become amorphous and suffer from larger volume changes. The lithiation/delithiation processes are proposed to occur in single phase reactions at approximately 0.2 and 0.4 V vs. Li/Li+, respectively, distinct from other diamond cubic or amorphous silicon anodes. Reversible capacities as high as 499 mAh g-1 at a 5 mA g-1 rate were observed for silicon clathrate with composition Ba8Al8.54Si37.46, corresponding to Li:Si of 1.18:1. The results show that silicon clathrates could be promising durable anodes for lithium-ion batteries.

  13. 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.; Tucker, Matthew G.; Evans, Ivana Radosavljevi?

    2013-09-15

    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.

  14. PHYSICAL REVIEW B 86, 144109 (2012) Intrinsic point-defect equilibria in tetragonal ZrO2: Density functional theory analysis

    E-Print Network [OSTI]

    Yildiz, Bilge

    2012-01-01

    on the technologically important tetragonal zirconium oxide, T-ZrO2. We showed that phonon free energy and electronic) belongs to the list of the most important metal oxides due to its wide usage in different technological for Electrochemical Interfaces, Department of Nuclear Science and Engineering, Massachusetts Institute of Technology

  15. Surface Passivation of Nanoporous TiO2 via Atomic Layer Deposition of ZrO2 for Solid-State Dye-Sensitized Solar Cell Applications

    E-Print Network [OSTI]

    Surface Passivation of Nanoporous TiO2 via Atomic Layer Deposition of ZrO2 for Solid-State Dye; ReVised Manuscript ReceiVed: August 22, 2009 We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO2 nanoparticles for solid-state dye

  16. Density functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100)

    E-Print Network [OSTI]

    Kummel, Andrew C.

    in this manuscript), usually grown by atomic layer deposition (ALD). These oxides, under normal Ge process- ingDensity functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100) T.J. Grassman

  17. Stress Relaxation of Compression Loaded Plasma-Sprayed 7 Wt% Y2O3ZrO2 Stand-Alone Coatings

    E-Print Network [OSTI]

    Trice, Rodney W.

    -temperature environments such as gas-turbine engines.1­4 TBCs typically consist of a metallic substrate coated with an B100Stress Relaxation of Compression Loaded Plasma-Sprayed 7 Wt% Y2O3­ZrO2 Stand-Alone Coatings Graeme R. Dickinson, Chris Petorak, Keith Bowman, and Rodney W. Tricew School of Materials Engineering

  18. Comment on “Correlation and relativistic effects in U metal and U-Zr alloy: Validation of ab initio approaches”

    SciTech Connect (OSTI)

    Söderlind, P. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Landa, A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Turchi, P. E. A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2014-10-01

    In a recent paper, Xie et al. [Phys. Rev. B 88, 235128 (2013)], report that the density-functional theory (DFT) with the so-called DFT plus Hubbard U (DFT+U) modification improves energetics, volumes, and formation enthalpies over the standard form of DFT for uranium metal and U-Zr alloys. Also, spin-orbit coupling (SOC) was argued to advance the aforementioned properties in these systems. We demonstrate, contrarily, that neither the Hubbard U approach nor SOC is necessary for a correct description of uranium metal and U-Zr alloys. We further illustrate that the combination of DFT+U and SOC in the projector augmented-wave calculations by Xie et al. results in unrealistically large volume expansions, particularly for ?-U, in stark contrast to all previous calculations for elemental uranium. This in turn may also explain why the DFT+U with SOC model predicts negative enthalpy of mixing in the U-Zr alloy system contradicting conventional DFT as well as one of the main features of the experimental U-Zr phase diagram. The assertion by Xie et al. that DFT+U is an improvement over DFT for these systems is illustrated to be incorrect.

  19. Giant dielectric response in Pb,,Zr,Ti...O3Pb2Ru2O6.5 all-ceramic percolative composite

    E-Print Network [OSTI]

    Bobnar, Vid

    Giant dielectric response in Pb,,Zr,Ti...O3­Pb2Ru2O6.5 all-ceramic percolative composite Vid Bobnar response of a composite comprising a conductive filler embedded in a dielectric matrix--the effective­9 and inorganic composites comprising metal particles dis- persed in a dielectric matrix10­14 have been developed

  20. 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

  1. Preparation and Characterization of Au-ZrO2-SiO2 Nanocomposite Spheres and Their Application in Enrichment and Detection of Organophosphorus Agents

    SciTech Connect (OSTI)

    Yang, Yuqi; Tu, Haiyang; Zhang, Aidong; Du, Dan; Lin, Yuehe

    2012-03-01

    Au-ZrO{sub 2}-SiO{sub 2} nanocomposite spheres were synthesized and used as selective sorbents for the solid-phase extraction (SPE) of orananophosphorous agents. A non-enzymatic electrochemical sensor based on an Au-ZrO{sub 2}-SiO{sub 2} modified electrode was developed for selective detection of orananophosphorous pesticides (OPs). The Au-ZrO{sub 2}-SiO{sub 2} nanocomposite spheres were synthesized by hydrolysis and condensation of zirconia n-butoxide (TBOZ) on the surface of SiO{sub 2} spheres and then introduction of gold nanoparticles on the surface. Transmission electron microscope and X-ray photoelectron spectroscopy were performed to characterize the formation of the nanocomposite sphere. Fast extraction of OP was achieved by Au-ZrO{sub 2}-SiO{sub 2} modified electrode within 5 min via the specific affinity between zirconia and phosphoric group. The assay yields a broad concentration range of paraoxon-ethyl from 1.0 to 500 ng/mL{sup -1} with a detection limit 0.5 ng/mL{sup -1}. This selective and sensitive method holds great promise for the enrichment and detection of OPs.

  2. Electrical and dielectric properties of ZnO and CeO{sub 2} doped ZrTi{sub 2}O{sub 6} ceramic

    SciTech Connect (OSTI)

    George, Aneesh; Thomas, Jijimon K.; John, Annamma [Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015 (India); Solomon, Sam, E-mail: samdmrl@yahoo.com [Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India and Department of Physics, St. John's College, Anchal, Kollam 691306 (India)

    2014-01-28

    Zirconium oxide (ZrO{sub 2}) and titanium dioxide (TiO{sub 2}) are the important catalyst supports, since it has acidic and basic properties. The intermediate phase zirconium titanate ZrTi{sub 2}O{sub 6}, which is a solid solution with Zr:Ti ratio 1:2 has outstanding dielectric properties. The effects of doping of ZnO and CeO{sub 2} on the dielectric and electrical properties of ZrTi{sub 2}O{sub 6} ceramic are investigated. On adding 0.5 wt% ZnO, the dielectric constant is increased but, on adding CeO{sub 2}, the dielectric constant is decreased. The bulk density of pure sample sintered at 1530 °C is 91% of theoretical density while that of the doped samples sintered at 1450 °C is more than 94% of theoretical density. Scanning electron micrographs reveal that the samples are well sintered with minimum porosity. The semicircle behavior in the Cole-Cole plots at room temperature reveals that the samples are good ionic conductor. The induced impedance is reduced for doped samples and this can be used as a material for electrolyte in Solid Oxide Fuel Cell.

  3. PHYSICAL REVIEW B 85, 155202 (2012) Structural, electronic, and hyperfine properties of pure and Ta-doped m-ZrO2

    E-Print Network [OSTI]

    Svane, Axel Torstein

    2012-01-01

    , in refractory materials, solid oxide fuel cell electrolytes, catalyst substrates, protective coatings Zirconium dioxide (zirconia) is one of the most important compounds in materials science and technology and (sometimes) with the addition of small amounts of impurities, ZrO2 has applications, for example

  4. Characterization and oxidation states of Cu and Pd in Pd?CuO/ZnO/ZrO[subscript 2] catalysts for hydrogen production by methanol partial oxidation

    SciTech Connect (OSTI)

    Schuyten, S.; Guerrero, S.; Miller, J.T.; Shibatae, T.; Wolf, E.E.

    2009-01-30

    Copper and zinc oxide based catalysts prepared by coprecipitation were promoted with palladium and ZrO{sub 2}, and their activity and selectivity for methanol oxidative reforming was measured and characterized by N{sub 2}O decomposition, X-ray absorption spectroscopy, BET, X-ray photoelectron spectroscopy, X-ray diffraction, and temperature programmed reduction. Addition of ZrO{sub 2} increased copper dispersion and surface area, with little effect on activity, while palladium promotion significantly enhanced activity with little change of the catalytic structure. A catalyst promoted with both ZrO{sub 2} and palladium yielded hydrogen below 150 C. EXAFS results under reaction conditions showed that the oxidation state of copper was influenced by palladium in the catalyst bulk. A palladium promoted catalyst contained 90% Cu{sup 0}, while the copper in an unpromoted catalyst was 100% Cu{sup 1+} at the same temperature. Palladium preferentially forms an unstable alloy with copper instead of zinc during reduction, which persists during reaction regardless of copper oxidation state. A 100-h time on stream activity measurement showed growth in copper crystallites and change in copper oxidation state resulting in decreasing activity and selectivity. A kinetic model of the reaction pathway showed that palladium and ZrO{sub 2} promoters lower the activation energy of methanol combustion and steam reforming reactions.

  5. Unit-cell thick BaTiO{sub 3} blocks octahedral tilt propagation across oxide heterointerface

    SciTech Connect (OSTI)

    Kan, Daisuke Aso, Ryotaro; Kurata, Hiroki; Shimakawa, Yuichi

    2014-05-14

    We fabricated SrRuO{sub 3}/BaTiO{sub 3}/GdScO{sub 3} heterostructures in which the BaTiO{sub 3} layer is one unit cell thick by pulsed laser deposition and elucidated how the BaTiO{sub 3} layer influences structural and magneto-transport properties of the SrRuO{sub 3} layer through octahedral connections across the heterointerface. Our X-ray-diffraction-based structural characterizations show that while an epitaxial SrRuO{sub 3} layer grown directly on a GdScO{sub 3} substrate is in the monoclinic phase with RuO{sub 6} octahedral tilts, a one-unit-cell-thick BaTiO{sub 3} layer inserted between SrRuO{sub 3} and GdScO{sub 3} stabilizes the tetragonal SrRuO{sub 3} layer with largely reduced RuO{sub 6} tilts. Our high-angle annular dark-field and annular bright-field scanning transmission electron microscopy observations provide an atomic-level view of the octahedral connections across the heterostructure and reveal that the BaTiO{sub 3} layer only one unit cell thick is thick enough to stabilize the RuO{sub 6}-TiO{sub 6} octahedral connections with negligible in-plane oxygen atomic displacements. This results in no octahedral tilts propagating into the SrRuO{sub 3} layer and leads to the formation of a tetragonal SrRuO{sub 3} layer. The magneto-transport property characterizations also reveal a strong impact of the octahedral connections modified by the inserted BaTiO{sub 3} layer on the spin-orbit interaction of the SrRuO{sub 3} layer. The SrRuO{sub 3} layer on BaTiO{sub 3}/ GdScO{sub 3} has in-plane magnetic anisotropy. This is in contrast to the magnetic anisotropy of the monoclinic SrRuO{sub 3} films on the GdScO{sub 3} substrate, in which the easy axis is ?45° to the film surface normal. Our results demonstrate that the one-unit-cell-thick layer of BaTiO{sub 3} can control and manipulate the interfacial octahedral connection closely linked to the structure-property relationship of heterostructures.

  6. Spin liquid ground state in the frustrated J1-J2 zigzag chain system BaTb2O4

    SciTech Connect (OSTI)

    Aczel, Adam A [ORNL; Li, Ling [University of Tennessee, Knoxville (UTK); Garlea, Vasile O [ORNL; Yan, Jiaqiang [ORNL; Weickert, Franziska [Los Alamos National Laboratory (LANL); Zapf, Vivien [National High Magnetic Field Laboratory, Los Alamos National Lab, Los Alamos; Movshovich, R [Los Alamos National Laboratory (LANL); Jaime, M. [Los Alamos National Laboratory (LANL); Baker, Peter J. [ISIS Facility, Rutherford Appleton Laboratory (ISIS); Keppens, V. [University of Tennessee, Knoxville (UTK); Mandrus, D. [University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL)

    2015-01-01

    We have investigated polycrystalline samples of the zigzag chain system BaTb2O4 with magnetic susceptibility, heat capacity, neutron powder diffraction, and muon spin relaxation measurements. No magnetic transitions are observed in the bulk measurements, while neutron diffraction reveals the presence of low-temperature, short-range, intrachain magnetic correlations between Tb3+ ions. muSR indicates that these correlations are dynamic, as no signatures of static magnetism are detected by the technique down to 0.095 K. These combined findings provide strong evidence for a spin liquid ground state in BaTb2O4.

  7. Page 1 | B.A. in Special Education (General Curriculum) and Elementary Education (K-6) Dual Major | Academic Plan of Study

    E-Print Network [OSTI]

    Wang, Yongge

    Page 1 | B.A. in Special Education (General Curriculum) and Elementary Education (K-6) Dual Major | Academic Plan of Study Updated October 2014 B.A. in Special Education (General Curriculum) and Elementary Education (K-6) Dual Program Academic Plan of Study College of Education Department of Special Education

  8. Temperature dependent blue second harmonic generation in Ba5Li2Ti2Nb8O30 microcrystals embedded in TeO2 glassmatrix

    E-Print Network [OSTI]

    Gopalan, Venkatraman

    Temperature dependent blue second harmonic generation in Ba5Li2Ti2Nb8O30 microcrystals embedded of the polar phase Ba5Li2Ti2Nb8O30 (BLTN). Blue (400 nm) second harmonic generation (SHG) was observed in transmission mode when 800 nm laser light was allowed to pass through the individual crystallites. The blue SHG

  9. Zelftest chemie voor 1 Ba Bio-ir, Chemie, Fysica en sterrenkunde Voor meer informatie: contacteer csb.etterbeek@vub.ac.be

    E-Print Network [OSTI]

    Einmahl, Uwe

    Zelftest chemie voor 1 Ba Bio-ir, Chemie, Fysica en sterrenkunde Voor meer informatie: contacteer opgenomen in het bijhorend overzicht van de verwachte voorkennis chemie. 1. Elementaire chemie en chemisch, whisky, fruitsap met pulp, keukenzout #12;Zelftest chemie voor 1 Ba Bio-ir, Chemie, Fysica en

  10. 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

  11. 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)

    2013-02-15

    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.

  12. 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)

    2006-06-28

    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.

  13. Alternation of the Pd Lattice in Nano-Sized-Pd/ZrO2 Composite during Hydrogen Absorption

    SciTech Connect (OSTI)

    Arachi, Yoshinori; Asai, Takeshi; Emura, Shuichi; Omura, Akira; Nunogaki, Masanobu; Yamaura, Shunichi; Inoue, Akihisa; Arata, Yoshiaki

    2007-02-02

    Structural analysis of high Deuterium absorbed 5 nm Pd particles in dispersed ZrO2 has been carried out using XAFS techniques. X-ray absorption spectra around the Pd K-absorption edge were observed and analyzed. The Pd-Pd bonding distance in the fcc Pd lattice was enlarged by 0.08 {approx} 0.09 A during absorption of deuterium, and it completely reverted to its original state with the release of deuterium while maintaining the crystal lattice symmetry. These changes provide evidence that deuterium locates not on the surface of the Pd particle, but rather within the Pd crystal lattice. XANES spectra clearly indicate that any change in the oxidation state of Pd are not observed, resulting in no reaction of the absorbed Deuterium atoms with Pd atoms. This paper reports the alternation of Pd lattice in nano-sized composite during hydrogen absorption. The possible models of deuterium position in the Pd lattice are also discussed.

  14. 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

    2012-01-01

    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

  15. Music BA Curriculum (37 credits + 3) Rev. 5-1-08 Freshman Year Prerequisite course: 2nd semester credits 3

    E-Print Network [OSTI]

    Sibille, Etienne

    Music BA Curriculum (37 credits + 3) Rev. 5-1-08 Freshman Year ­ Prerequisite course: 2nd semester credits 3 MUS 0100 Fundamentals of Western Music 3 Sample Course Sequence Year 1 1st semester credits 2nd lessons 1 Ensemble 1 Year 3 1st semester credits 2nd semester credits 8 MUS 1904 Senior Seminar 3 Senior

  16. Design of efficient lens ducts Rulian Fu, Guangjun Wang, Zhaoqi Wang, Enxu Ba, Guoguang Mu, and Xin-Hua Hu

    E-Print Network [OSTI]

    Design of efficient lens ducts Rulian Fu, Guangjun Wang, Zhaoqi Wang, Enxu Ba, Guoguang Mu, and Xin-Hua Hu Lens ducts have the potential to couple the output from a laser diode array efficiently- tigate different design approaches of lens ducts and demonstrate the possibility to obtain an output beam

  17. Dielectric and viscoelastic properties of KNbO3 doped BaTiO3 Liang Dong,1

    E-Print Network [OSTI]

    Lakes, Roderic

    titanate ce- ramic shed a light on both electrical and mechanical applica- tions. This paper deals with electrical and mechanical properties of BaTiO3 doped with KNbO3 and their relation to compositionPrep, Metuchen, NJ). The 3644 Ultrabind binder (SPEX CertiPrep PrepAid, Metuchen, NJ) was

  18. 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

  19. 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

  20. Production of highly-enriched 134Ba for a reference material for isotope dilution mass spectrometry measurements

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

    Horkley, J. J.; Carney, K. P.; Gantz, E. M.; Davies, J. E.; Lewis, R. R.; Crow, J. P.; Poole, C. A.; Grimes, T. S.; Giglio, J. J.

    2015-03-17

    Isotope dilution mass spectrometry (IDMS) is an analytical technique capable of providing accurate and precise quantitation of trace isotope abundance and assay providing measurement uncertainties below 1 %. To achieve these low uncertainties, the IDMS method ideally utilizes chemically pure “spike” solutions that consist of a single highly enriched isotope that is well-characterized relating to the abundance of companion isotopes and concentration in solution. To address a current demand for accurate 137Cs/137Ba ratio measurements for “age” determination of radioactive 137Cs sources, Idaho National Laboratory (INL) is producing enriched 134Ba isotopes that are tobe used for IDMS spikes to accurately determinemore »137Ba accumulation from the decay of 137Cs. The final objective of this work it to provide a homogenous set of reference materials that the National Institute of Standards and Technology can certify as standard reference materials used for IDMS. The process that was developed at INL for the separation and isolation of Ba isotopes, chemical purification of the isotopes in solution, and the encapsulation of the materials will be described.« less