Powered by Deep Web Technologies
Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Lead-free piezoelectric ceramics with composition of (0.97?x)Na1/2Bi1/2TiO3-0.03NaNbO3-xBaTiO3  

Science Journals Connector (OSTI)

Compositions in (Na1/2Bi1/2)TiO3 based ternary system, (0.97 ? x) (Na1/2Bi1/2)TiO3-0.03NaNbO3-xBaTiO3 (x = 0, 0.01, 0.02, 0.04, 0.05, 0.06, 0.08) are synthesized using conventional solid state reaction method. In...

Yugong Wu; Huili Zhang; Yue Zhang; Jinyi Ma; Daohua Xie

2

Thermodynamic and kinetic analyses of the CO2 chemisorption mechanism on Na2TiO3: Experimental and theoretical evidences  

SciTech Connect

ABSTRACT: Sodium metatitanate (Na2TiO3) was successfully synthesized via a solid-state reaction. The Na2TiO3 structure and microstructure were characterized using X-ray diffraction, scanning and transmission electron microscopy, and N2 adsorption. Then, the CO2 chemisorption mechanism on Na2TiO3 was systematically analyzed to determine the influence of temperature. The CO2 chemisorption capacity of Na2TiO3 was evaluated both dynamically and isothermally, and the products were reanalyzed to elucidate the Na2TiO3?CO2 reaction mechanism. Different chemical species (Na2CO3, Na2O, and Na4Ti5O12 or Na16Ti10O28) were identified during the CO2 capture process in Na2TiO3. In addition, some CO2 chemisorption kinetic parameters were determined. The ?H? was found to be 140.9 kJ/mol, to the Na2TiO3?CO2 system, between 600 and 780 °C. Results evidenced that CO2 chemisorption on Na2TiO3 highly depends on the reaction temperature. Furthermore, the experiments were theoretically supported by different thermodynamic calculations. The calculated thermodynamic properties of CO2 capture reactions by (Na2TiO3, Na4Ti5O12, and Na16Ti10O28) sodium titanates were fully investigated.

Duan, Yuhua [U.S. DOE

2014-01-01T23:59:59.000Z

3

Catalytic Effect of Ti for Hydrogen Cycling in NaAlH4  

NLE Websites -- All DOE Office Websites (Extended Search)

Effect of Ti for Effect of Ti for Hydrogen Cycling in NaAlH 4 Mei-Yin Chou School of Physics Georgia Institute of Technology (DE-FG02-05ER46229) Acknowledgment: Yan Wang, Roland Stumpf Why is NaAlH 4 interesting? A viable candidate for hydrogen-storage material: High theoretical weight-percent hydrogen content of 5.55% and low cost But (before 1997) Dehydrogenation occurs at high temperature; rehydrogenation is difficult. Bogdanovic and Schwickardi, 1997 Hydrogen can be reversibly absorbed and desorbed from NaAlH 4 under moderate conditions by the addition of catalysts (compounds containing Ti, Zr, etc.) High Hydrogen Contents in Complex Hydrides Hydride wt% Hydride wt% Be(BH 4 ) 2 20.8 Mg(AlH 4 ) 2 9.3 LiBH 4 18.2 Ca(AlH 4 ) 2 7.9 Mg(BH 4 ) 2 14.9 KBH 4 7.5 Ca(BH 4 ) 2 11.6 NaAlH 4 7.5 NaBH4 10.7 Ga(AlH

4

Improved Hydrogen Storage Kinetics of Nanoconfined NaAlH4 Catalyzed with TiCl3 Nanoparticles  

Science Journals Connector (OSTI)

Improved Hydrogen Storage Kinetics of Nanoconfined NaAlH4 Catalyzed with TiCl3 Nanoparticles ... We demonstrate that NaAlH4 confined within the nanopores of a titanium-functionalized metal–organic framework (MOF) template MOF-74(Mg) can reversibly store hydrogen with minimal loss of capacity. ...

Thomas K. Nielsen; Marek Polanski; Dariusz Zasada; Payam Javadian; Flemming Besenbacher; Jerzy Bystrzycki; Jørgen Skibsted; Torben R. Jensen

2011-03-29T23:59:59.000Z

5

Direct measurement of the spin gap in a quasi-one-dimensional clinopyroxene: NaTiSi2O6  

Science Journals Connector (OSTI)

True inorganic spin-Peierls materials are extremely rare, but NaTiSi2O6 was at one time considered to be an ideal candidate owing to its well separated chains of edge-sharing TiO6 octahedra. At low temperatures, this material undergoes a phase transition from C2/c to P1¯ symmetry, where Ti3+?Ti3+ dimers begin to form within the chains. However, it was quickly realized with magnetic susceptibility that simple spin fluctuations do not progress to the point of enabling such a transition. Since then, considerable experimental and theoretical endeavors have been undertaken to find the true ground state of this system and explain how it manifests. Here, we employ the use of x-ray diffraction, neutron spectroscopy, and magnetic susceptibility to directly and simultaneously measure the symmetry loss, spin singlet-triplet gap, and phonon modes. A gap of 53(3) meV was observed, fit to the magnetic susceptibility, and compared to previous theoretical models to unambiguously assign NaTiSi2O6 as having an orbital-assisted Peierls ground state.

Harlyn J. Silverstein; Alison E. Smith; Cole Mauws; Douglas L. Abernathy; Haidong Zhou; Zhiling Dun; Johan van Lierop; Christopher R. Wiebe

2014-10-13T23:59:59.000Z

6

Influence of ultraviolet light irradiation on corrosion behavior of weathering steel with and without TiO2-coating in 3 mass% NaCl solution  

Science Journals Connector (OSTI)

In this study the influence of ultraviolet (UV) light on the corrosion behavior of weathering steel with and without TiO2 coating has been investigated in 3% NaCl solution, using anodic polarization, dipping and dropping tests. In polarization tests a large negative shift of corrosion potential appeared for the TiO2-coated specimen in UV light. The weight loss of the steels with and without TiO2 film increased under UV light in the dipping test, while they decreased in the dropping test. The rust formed on the weathering steel showed a semiconductor like behavior, similar to that shown by TiO2 film.

Manal G. Mahmoud; Rongguang Wang; Masahiko Kato; Keijiro Nakasa

2005-01-01T23:59:59.000Z

7

Early-type stars observed in the ESO UVES Paranal Observatory Project: I -- Interstellar Na I UV, Ti II and Ca II K observations  

E-Print Network (OSTI)

We present an analysis of interstellar Na I (lambda=3302.37\\AA, 3302.98\\AA), Ti II (lambda=3383.76\\AA) and Ca II K (lambda=3933.66\\AA) absorption features for 74 sightlines towards O- and B-type stars in the Galactic disc. The data were obtained from the UVES Paranal Observatory Project, at a spectral resolution of 3.75km/s and with mean signal to noise ratios per pixel of 260, 300 and 430 for the Na I, Ti II and Ca II observations, respectively. Interstellar features were detected in all but one of the Ti II sightlines and all of the Ca II sightlines. The dependence of the column density of these three species with distance, height relative to the Galactic plane, H I column density, reddening and depletion relative to the solar abundance has been investigated. We also examine the accuracy of using the Na I column density as an indicator of that for H I. In general we find similar strong correlations for both Ti and Ca, and weaker correlations for Na. Our results confirm the general belief that Ti and Ca occur in the same regions of the interstellar medium and also that the Ti II/Ca II ratio is constant over all parameters. We hence conclude that the absorption properties of Ti and Ca are essentially constant under the general interstellar medium conditions of the Galactic disc.

I. Hunter; J. V. Smoker; F. P. Keenan; C. Ledoux; E. Jehin; R. Cabanac; C. Melo; S. Bagnulo

2006-01-17T23:59:59.000Z

8

Catalytic Effect of Ti for Hydrogen Cycling in NaAlH4  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

+ 2AlH 3 3 NaAlH 4 M. Mamula et al., Coll. Czechoslov. Chem. Commun. 32, 884 (1967). Atomic Hydrogen Interacting with Al Surfaces "H adsorption and the formation of alane...

9

TiO2 nanoparticles for Li-ion battery anodes: Mitigation of growth and irreversible capacity using LiOH and NaOH  

Science Journals Connector (OSTI)

TiO2 anatase and rutile nanoparticles with various sizes and morphologies have been synthesized by very facile and scalable methods. A post-treatment including addition of LiOH or NaOH to the particles followed by heating at 180°C in air or autoclave ...

Martin Søndergaard; Yanbin Shen; Aref Mamakhel; Mario Marinaro; Margret Wohlfahrt-Mehrens; Karen Wonsyld; Søren Dahl; Bo B. Iversen

2014-12-04T23:59:59.000Z

10

Origin of giant permittivity and high-temperature dielectric anomaly behavior in Na{sub 0.5}Y{sub 0.5}Cu{sub 3}Ti{sub 4}O{sub 12} ceramics  

SciTech Connect

Na{sub 0.5}Y{sub 0.5}Cu{sub 3}Ti{sub 4}O{sub 12} ceramics prepared by the conventional solid-state reaction method under various sintering conditions were found to exhibit a giant dielectric constant over 10 000 around room temperature. Two electrical responses were observed in the combined modulus and impedance plots, indicating the presence of Maxwell-Wagner relaxation. The contributions of semiconducting grains and insulating grain boundaries (corresponding to high-frequency and low-frequency electrical response, respectively) played important roles in the dielectric properties of Na{sub 0.5}Y{sub 0.5}Cu{sub 3}Ti{sub 4}O{sub 12} ceramics. The correlations between grain boundaries resistance and low frequency dielectric loss, grains resistance and the position of dielectric loss peak were addressed. Mixed-valent structures of Cu{sup 2+}/Cu{sup 3+} and Ti{sup 3+}/Ti{sup 4+} had been determined using X-ray photoelectron spectroscopy. Electron hopping between Cu{sup 2+} and Cu{sup 3+} and electron transport in Ti{sup 3+}-O-Ti{sup 4+} paths were proposed as the origin of the semiconducting nature of Na{sub 0.5}Y{sub 0.5}Cu{sub 3}Ti{sub 4}O{sub 12} ceramics. In particular, high-temperature dielectric anomaly behavior was investigated in detail. A dielectric peak exhibiting relaxor-like behavior was observed around 200 Degree-Sign C, which was linked with the formation of oxygen vacancies. Based on the electric modulus results, this behavior was explored in the light of the defect formation and explained in terms of a competition process depending on the combinational contribution to polarization between n- and p-type carriers rather than a relaxation process.

Liang, Pengfei; Li, Yanyan; Wei, Lingling; Yang, Zupei [Key Laboratory for Macromolecular Science of Shaanxi Province School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi (China)] [Key Laboratory for Macromolecular Science of Shaanxi Province School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi (China); Zhao, Yuqing [Department of Chemistry, School of Science, Hong Kong Baptist University (Hong Kong)] [Department of Chemistry, School of Science, Hong Kong Baptist University (Hong Kong)

2013-06-14T23:59:59.000Z

11

Ti Plasmid  

NLE Websites -- All DOE Office Websites (Extended Search)

Ti Plasmid Ti Plasmid Name: Dixenia Location: N/A Country: N/A Date: N/A Question: What can you tell me about the Ti Plasmid? Replies: This plasmid is named for a plasmid found in a bacteria called Agrobacter tumefaciens. It causes "plant cancer" or what are known as galls. They are little tumors in which the bacteria can grow and live in the plant. Ti stands for tumor inducing. The bacterium gets into the plant through some kind of wound, ie. a scratch. It injects its plasmid into a plant cell and the plasmid inserts its DNA into the plant's DNA. Then the DNA directs the plant to make a hollow tumor where the bacteria can live. Scientists have taken advantage of this plant's ability to insert foreign DNA into a plant. They take the genes out of the plasmid that cause galls, and insert genes of interest, ie. genes for pest resistance and let the plasmid carry those genes into the plant. The plant will start making the product you want. You may have seen a picture of a tobacco plant glowing because firefly genes for glowing were inserted into the plant. They did this so they could know if the gene had made it into the plant. Once they are sure the gene they want has made it into the plant, they clone the plant cells. By the way, plant tissue culture is a procedure that is very common and has been done for years, this is not the same as cloning animals.

12

Unification of the negative electrocaloric effect in Bi{sub 1/2}Na{sub 1/2}TiO{sub 3}-BaTiO{sub 3} solid solutions by Ba{sub 1/2}Sr{sub 1/2}TiO{sub 3} doping  

SciTech Connect

The microscopic mechanisms of the negative electrocaloric effect (ECE) of the single-phase (1?x)(0.94Bi{sub 1/2}Na{sub 1/2}TiO{sub 3}-0.06BaTiO{sub 3})-xBa{sub 1/2}Sr{sub 1/2}TiO{sub 3} (BNT-BT-BST) perovskite solid solutions fabricated via the sol-gel technique are explored in this study. Dielectric and mechanical relaxation analyses are employed to investigate the ferroelectric and structural transitions of the samples. The electrocaloric properties of the samples were measured by thermodynamics Maxwell relations. The difference between the depolarization temperature (T{sub d}) and the maximum dielectric constant temperature (T{sub m}) was found to decrease with increasing BST content. Doping with BST stabilized the ferroelectric phase along with unifying the EC temperature changes (?T) to only negative values. The origin of the uniform negative ECE of BNT-BT-BST is discussed.

Uddin, Sarir [Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon (Hong Kong); Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120 (Pakistan); Zheng, Guang-Ping, E-mail: mmzheng@polyu.edu.hk [Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon (Hong Kong); School of Materials Science and Engineering, The University of Shanghai for Science and Technology, Shanghai (China); Iqbal, Yaseen [Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120 (Pakistan); Ubic, Rick [Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725-2090 (United States); Yang, Junhe [School of Materials Science and Engineering, The University of Shanghai for Science and Technology, Shanghai (China)

2013-12-07T23:59:59.000Z

13

Numerical model to determine the composition of H2ONaClCaCl2 fluid inclusions based on  

E-Print Network (OSTI)

Numerical model to determine the composition of H2O­NaCl­CaCl2 fluid inclusions based 2010 Abstract Natural fluids approximated by the H2O­NaCl­CaCl2 system are common in a wide range the compositions of fluid inclusions in the H2O­NaCl­CaCl2 sys- tem based on microthermometric and microanalytical

Bodnar, Robert J.

14

Determination of crystallographic orientation of lead-free piezoelectric (K,Na)NbO{sub 3} epitaxial thin films grown on SrTiO{sub 3} (100) surfaces  

SciTech Connect

Crystallographic structure of sol-gel-processed lead-free (K,Na)NbO{sub 3} (KNN) epitaxial films on [100]-cut SrTiO{sub 3} single-crystalline substrates was investigated for a deeper understanding of its piezoelectric response. Lattice parameter measurement by high-resolution X-ray diffraction and transmission electron microscopy revealed that the orthorhombic KNN films on SrTiO{sub 3} (100) surfaces are [010] oriented (b-axis-oriented) rather than commonly identified c-axis orientation. Based on the crystallographic orientation and corresponding ferroelectric domain structure investigated by piezoresponse force microscopy, the superior piezoelectric property along b-axis of epitaxial KNN films than other orientations can be explained.

Yu, Qi; Zhu, Fang-Yuan; Cheng, Li-Qian; Wang, Ke; Li, Jing-Feng, E-mail: jingfeng@mail.tsinghua.edu.cn [State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing (China)] [State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing (China)

2014-03-10T23:59:59.000Z

15

Long ranged structural modulation in the pre-morphotropic phase boundary cubic-like state of the lead-free piezoelectric Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-BaTiO{sub 3}  

SciTech Connect

The nature of the pre-morphotropic phase boundary (MPB) cubic-like state in the lead-free piezoelectric ceramics (1?x)Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-(x)BaTiO{sub 3} at x???0.06 has been examined in detail by electric field and temperature dependent neutron diffraction, x-ray diffraction, dielectric and ferroelectric characterization. The superlattice reflections in the neutron diffraction patterns cannot be explained with the tetragonal P4bm and the rhombohedral (R3c) phase coexistence model. The cubic like state is rather a result of long ranged modulated complex octahedral tilt. This modulated structure exhibits anomalously large dielectric dispersion. The modulated structure transforms to a MPB state on poling. The field-stabilized MPB state is destroyed and the modulated structure is restored on heating the poled specimen above the Vogel-Fulcher freezing temperature. The results show the predominant role of competing octahedral tilts in determining the nature of structural and polar states in Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-based ferroelectrics.

Garg, Rohini; Narayana Rao, Badari; Ranjan, Rajeev, E-mail: rajeev@materials.iisc.ernet.in [Department of Materials Engineering, Indian Institute of Science, Bangalore 560012 (India); Senyshyn, Anatoliy [Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Lichtenbergestrasse 1, D-85747 Garching b. München (Germany)

2013-12-21T23:59:59.000Z

16

The electronic properties and lattice dynamics of (Na{sub 0.5}Bi{sub 0.5})TiO{sub 3}: From cubic to tetragonal and rhombohedral phases  

SciTech Connect

The structural, electronic and dynamical properties of the cubic, tetragonal and rhombohedral phases of a lead-free ferroelectrics, (Na{sub 0.5}Bi{sub 0.5})TiO{sub 3} (NBT), have been studied with a density functional formalism. The direct band gap is determined to be 2?3?eV for three phases, suggesting them to be good optical material. The equilibrium structures were given, and the importance of Bi atom in the low-symmetry ferroelectric phases were investigated with the electron localization functions analysis. The vibration modes at the ? point were calculated to provide a basis for analyzing the Raman and IR spectra. Soft modes were found in both the cubic and the tetragonal phases, providing a clue in understanding the ferroelectric phase transition in NBT.

Lü, Hongfeng [Department of Applied Physics, College of Science, China Agricultural University, Beijing 100083 (China); Wang, Shanying [Department of Physics, Tsinghua University, Beijing 100084 (China); Wang, Xiaosu, E-mail: xiaosuwang@cau.edu.cn [Department of Applied Physics, College of Science, China Agricultural University, Beijing 100083 (China); Department of Physics, Tsinghua University, Beijing 100084 (China)

2014-03-28T23:59:59.000Z

17

Synthesis and characterization of alkali-metal titanium alkoxide compounds MTi(O-i-Pr) sub 5 (M = Li, Na, K): Single-crystal x-ray diffraction structure of (LiTi(O-i-Pr) sub 5 ) sub 2  

SciTech Connect

The series (MTi(O-iPr){sub 5}), M = Li, Na, or K, has been prepared by the reaction of MO-i-Pr with Ti(O-i-Pr){sub 4}. A single-crystal x-ray diffraction study revealed that (LiTi(O-i-Pr){sub 5}) crystallizes from toluene at {minus}30{degree}C in the monoclinic space group P2{sub 1}/n, with unit cell dimensions a = 11.440 (8) {angstrom}, b = 16.396 (13) {angstrom}, c = 11.838 (8) {angstrom}, {beta} = 92.59 (5){degree}, and Z = 4, as a dimer containing two approximately trigonal-bipyramidal titanium centers linked by lithium bridges. In benzene solution, all three compounds are dimeric, as revealed by cryoscopic molecular weight determination, and all three undergo an alkoxide ligand exchange process that is rapid on the {sup 1}H NMR time scale at room temperature. The positions of {nu}(M-O) are assigned based on the low-energy shifts observed upon deuteriation of the isopropoxide ligands. 23 refs., 3 figs., 3 tabs.

Hampden-Smith, M.J.; Williams, D.S. (Univ. of New Mexico, Albuquerque (USA)); Rheingold, A.L. (Univ. of Delaware, Newark (USA))

1990-10-03T23:59:59.000Z

18

Synthesis of na-doped lithium metatitanate and its absorption for carbon dioxide  

Science Journals Connector (OSTI)

Na-doped lithium metatitanate (Na-doped Li2TiO3) absorbent was doped with Na2CO3 and lithium metatitanate (Li2TiO3) was prepared by a solid-state reaction method from mixture of TiO2 ...

Liu Zhirong, Zhang Huan, Wang Yun, Zhan Xinxing

2014-01-01T23:59:59.000Z

19

MODELS FOR METAL-POOR STARS WITH ENHANCED ABUNDANCES OF C, N, O, Ne, Na, Mg, Si, S, Ca, AND Ti, IN TURN, AT CONSTANT HELIUM AND IRON ABUNDANCES  

SciTech Connect

Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/Fe] ratios at similar [Fe/H] values. In order to investigate the implications of variations in the abundances of these and other metals for H-R diagrams and predicted ages, grids of evolutionary sequences have been computed for scaled solar and enhanced {alpha}-element metal abundances, and for mixtures in which the assumed [m/Fe] value for each of the metals C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti has been increased, in turn, by 0.4 dex at constant [Fe/H]. These tracks, together with isochrones for ages from Almost-Equal-To 5 to 14 Gyr, have been computed for -3.0 {<=} [Fe/H] {<=}-0.6, with helium abundances Y = 0.25, 0.29, and 0.33 at each [Fe/H] value, using upgraded versions of the Victoria stellar structure program and the Regina interpolation code, respectively. Turnoff luminosity versus age relations from isochrones are found to depend almost entirely on the importance of the CNO cycle, and thereby mainly on the abundance of oxygen. Since C, N, and O, as well as Ne and S, do not contribute significantly to the opacities at low temperatures and densities, variations in their abundances do not impact the predicted T{sub eff} scale of red giants. The latter is a strong function of the abundances of only Mg and Si (and Fe, possibly to a lesser extent) because they are so abundant and because they are strong sources of opacity at low temperatures. For these reasons, Mg and Si also have important effects on the temperatures of main-sequence stars. Due to their low abundances, Na, Ca, and Ti are of little consequence for stellar models. The effects of varying the adopted solar metals mixture and the helium abundance at a fixed [Fe/H] are also briefly discussed.

VandenBerg, Don A.; Dotter, Aaron [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, B.C. V8W 3P6 (Canada); Bergbusch, Peter A. [Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2 (Canada); Ferguson, Jason W. [Department of Physics, Wichita State University, Wichita, KS 67260-0032 (United States); Michaud, Georges; Richer, Jacques [Departement de Physique, Universite de Montreal, Montreal, Quebec H3C 3J7 (Canada); Proffitt, Charles R., E-mail: vandenbe@uvic.ca, E-mail: Aaron.Dotter@gmail.com, E-mail: pbergbusch@accesscomm.ca, E-mail: proffitt@stsci.edu, E-mail: Jason.Ferguson@wichita.edu, E-mail: michaudg@astro.umontreal.ca, E-mail: jacques.richer@umontreal.ca [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2012-08-10T23:59:59.000Z

20

EPR study of Ti3+ ions formed under beta irradiation in silicate  

E-Print Network (OSTI)

1 EPR study of Ti3+ ions formed under beta irradiation in silicate glasses P. Lombard1* , N. Ollier in various silicate glasses have been studied by EPR spectroscopy at 20 K. Different parameters like the [Na of the Ti3+ ion EPR spectra in different Ti-doped silicate glasses has shown three different Ti3

Boyer, Edmond

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Photovoltaic effect of a bilayer thin film with (Na0.5Bi0.5)1?xBaxTiO3/BiFeO3 heterostructure  

Science Journals Connector (OSTI)

A bilayer film containing (Na0.5Bi0.5)1?xBaxTiO3 (NBT–BT)/BiFeO3(BFO) heterostructure was produced by chemical solution deposition. An enhancement of photovoltaic performance of the bilayer film was discovered. It leads to a short circuit current density of 18.9 µA cm?2 and an open circuit voltage of 0.5 V, these values are much higher than that of BFO film. When transparent indium tin oxide (ITO) was used to substitute gold (Au) as top electrode, the photovoltaic voltage and photocurrent density, respectively, improved to ~0.71 V and ~45 µA cm?2. A theoretical band diagram model considering the ferroelectric polarization, heterostructure on the interface, and energy band bending effect was constructed to depict the mechanism of photovoltaic enhancement of the bilayer film. Temperature-dependent I–V measurements were carried out to explore the barrier height of the Au/BFO/NBT–BT/FTO heterostructure, and a total barrier height of 0.54 eV was obtained. Our work opens up a promising new method that has the potential for enhancing the photovoltaic performance for ferroelectric thin film, and provides deeper understanding of the photovoltaic mechanism of ferroelectric films.

Fen Wu; Yiping Guo; Bing Guo; Yangyang Zhang; Hua Li; Hezhou Liu

2013-01-01T23:59:59.000Z

22

Solubilities of corundum, wollastonite and quartz in H2ONaCl solutions at 800 C and 10 kbar: Interaction of simple minerals  

E-Print Network (OSTI)

to halite saturation by weight-loss methods. Additional data on quartz solubility at a single Na and then leveling off to a max- imum of $0.015 at halite saturation (XNaCl % 0.58, where X is mole fraction.15 and then declines towards halite saturation. Quenched fluids have neutral pH at 25 °C. Wollastonite has low

Manning, Craig

23

Temperature dependent near infrared ultraviolet range dielectric functions of nanocrystalline (Na{sub 0.5}Bi{sub 0.5}){sub 1?x}Ce{sub x}(Ti{sub 0.99}Fe{sub 0.01})O{sub 3} films  

SciTech Connect

Optical properties and phase transition of Ce-modified (Na{sub 0.5}Bi{sub 0.5})(Ti{sub 0.99}Fe{sub 0.01})O{sub 3} nanocrystalline films have been investigated by spectroscopic ellipsometry from ?70 to 500?°C. Temperature dependent dielectric functions in the photon energy range of 0.6–6.4?eV can be derived by the Tauc-Lorentz model. It was found that the features in dielectric function (?) showed an abrupt variation near 200 and 340?°C, respectively. The phenomena can be explained by the appearance and/or reversal of polarization. It indicates that ferroelectric (rhombohedral) to paraelectric (tetragonal) phase transition is related to electronic band variation, which is observed by this technique.

Zhang, S.; Zhang, J. Z.; Han, M. J.; Li, Y. W.; Hu, Z.G., E-mail: zghu@ee.ecnu.edu.cn; Chu, J. H. [Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241 (China)

2014-01-27T23:59:59.000Z

24

Um novo paradigma na medicina DESENVOLVEU UMA METODOLOGIA DISRUPTIVA BASEADA NA INTEGRAO DE AVANADAS TECNOLOGIAS  

E-Print Network (OSTI)

Um novo paradigma na medicina do coração DESENVOLVEU UMA METODOLOGIA DISRUPTIVA BASEADA NA M�DICOS A MELHORAR DIAGN�STICOS NA MEDICINA DO CORA��O. #12;Depois do aperfeiçoamento das tecnologias pa medicina. A utilização dos resultados da genéti- ca como meio auxiliar de diagnóstico clínico é já uma

Instituto de Sistemas e Robotica

25

An analysis of lead-free (Bi{sub 0.5}Na{sub 0.5}){sub 0.915}-(Bi{sub 0.5}K{sub 0.5}){sub 0.05}Ba{sub 0.02}Sr{sub 0.015}TiO{sub 3} ceramic for efficient refrigeration and thermal energy harvesting  

SciTech Connect

This article demonstrates the colossal energy harvesting capability of a lead-free (Bi{sub 0.5}Na{sub 0.5}){sub 0.915}-(Bi{sub 0.5}K{sub 0.5}){sub 0.05}Ba{sub 0.02}Sr{sub 0.015}TiO{sub 3} ceramic using the Olsen cycle. The maximum harvestable energy density estimated for this system is found to be 1523?J/L (1523?kJ/m{sup 3}) where the results are presented for extreme ambient conditions of 20–160?°C and electric fields of 0.1–4 MV/m. This estimated energy density is 1.7 times higher than the maximum reported to date for the lanthanum-doped lead zirconate titanate (thin film) system. Moreover, this study introduces a generalized and effective solid state refrigeration cycle in contrast to the ferroelectric Ericson refrigeration cycle. The cycle is based on a temperature induced polarization change on application of an unipolar electric field to ferroelectric ceramics.

Vats, Gaurav; Vaish, Rahul, E-mail: rahul@iitmandi.ac.in [School of Engineering, Indian Institute of Technology Mandi, Himachal Pradesh 175 001 (India); Bowen, Chris R. [Department of Mechanical Engineering, Materials Research Centre, University of Bath, Bath BA2 7AY (United Kingdom)

2014-01-07T23:59:59.000Z

26

Investigation of phase transitions for the hydrothermal formation of TiO2 in the presence of F? ions  

Science Journals Connector (OSTI)

The hydrothermal phase transition of ammonium titanate into TiO2 in aqueous ammonia media was investigated in the presence of F? ions by adding various kinds of electrolytes such as NaCl, NH4Cl, NaF, and NH4F. The phase composition and the morphologies of the products were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). With the assistance of F? ions, pure brookite TiO2 can be hydrothermally prepared with a wide range of Na+ ion concentrations from 0.25 M to 1.5 M in just 24 h, which has obvious advantages over the previous NaCl scheme [1,2]. Moreover, photocatalytic degradation of MO shows that both anatase and brookite prepared in the presence of F? ions show superior photocatalytic activities than those prepared in the absence of F? ions. The phase transition mechanism from ammonium titanate into TiO2 was also proposed. Besides the introduction of Na+ ions that benefits the phase transition from titanate to brookite, F? ions are suggested to play two key roles during the hydrothermal process: catalyzing the condensation reaction of TiOH to produce TiOTi linkages by forming TiF and regulating the intercalation and the de-intercalation of Na+ ions by counteracting the electrostatic interaction between the Na+ ions and the titanate layers.

Hongyun Yang; Feng Chen; Yanchao Jiao; Jinlong Zhang

2013-01-01T23:59:59.000Z

27

Effects of Point Defects and Impurities on Kinetics in NaAlH4  

Energy.gov (U.S. Department of Energy (DOE))

A presentation showing that point defects play an important role in the kinetics of NaAlH4 including vacancies and interstitials consistent with observed effects of Ti.

28

Preparation of narrow band gap V2O5/TiO2 composite films by micro-arc oxidation  

Science Journals Connector (OSTI)

V2O5/TiO2...composite films were prepared on pure titanium substrates via micro-arc oxidation (MAO) in electrolytes consisting of NaVO3. Their morphology and elements were characterized by scanning electron micro...

Qiang Luo; Xin-wei Li; Qi-zhou Cai…

2012-11-01T23:59:59.000Z

29

Solubility of grossular, Ca3Al2Si3O12, in H2ONaCl solutions at 800 C and 10 kbar, and the stability of garnet in  

E-Print Network (OSTI)

Solubility of grossular, Ca3Al2Si3O12, in H2O­NaCl solutions at 800 °C and 10 kbar, and the stability of garnet in the system CaSiO3­Al2O3­H2O­NaCl Robert C. Newton, Craig E. Manning * Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095-1567, USA Received

Manning, Craig

30

In situ carbonation of peridotite for CO2 storage  

Science Journals Connector (OSTI)

...Gottschalk M ( 1997 ) Internally consistent thermodynamic data for rock-forming minerals in the system SiO2-TiO2-Al2O3-Fe2O3-CaO-MgO-FeO-K2O-Na2O-H2O-CO2 . Eur J Mineral 9 : 175 – 223 . 37 Blackwell DD ( 1971 ) in The Structure and Physical...

Peter B. Kelemen; Jürg Matter

2008-01-01T23:59:59.000Z

31

Adsorption of L-aspartate to rutile (a-TiO2): Experimental and theoretical surface complexation studies  

E-Print Network (OSTI)

Adsorption of L-aspartate to rutile (a-TiO2): Experimental and theoretical surface complexation the adsorption of L-aspartate on the surface of rutile (a-TiO2, pHPPZC = 5.4) in NaCl(aq) over a wide range of pH, ligand-to-solid ratio and ionic strength, using potentiometric titrations and batch adsorption

Sverjensky, Dimitri A.

32

Fabrication of functionally graded TiC/Ti composites by Laser Engineered Net Shaping  

E-Print Network (OSTI)

engineered net shaping (LENS), with compositions changing from pure Ti to approximately 95 vol% TiC; Microstructure; TiC carbide 1. Introduction Functionally graded materials (FGMs) are a class of advanced

DuPont, John N.

33

3d X 3d X SrTiO3Ti 2p 3d  

E-Print Network (OSTI)

XX 3d X 3d X X XX X XX SrTiO3Ti 2p 3d SrTiO3Ti 2p 3d 2p 2p SrTiO3 ts) 2p3/2 (t2g) 2p3/2 (e ) 2p1/2 (eg)2p SrTiO3 3d unit (t2g) (eg) (eg)2p1/2 (t2g)3d (Ti Fe Cu) arb. ( 2g) (Ti, Fe, Cu) y(ansitynten 3d In 3d 468464460456 · Photon Energy (e

Katsumoto, Shingo

34

Surface characterization and mechanical property of TiN/Ti-coated NiTi alloy by PIIID  

E-Print Network (OSTI)

significantly reduces the friction coefficient and improves wear resistance of the NiTi alloy. © 2006 Elsevier B prosthesis, heart valve replacement and biosensors [6,7]. TiN surface coating has also been found

Zheng, Yufeng

35

Rare earth doped TiO2-CdS and TiO2-CdS composites with improvement of photocatalytic hydrogen evolution under visible light irradiation  

Science Journals Connector (OSTI)

In this paper, we report the obtention of a series of rare earth doped composite Pt/RE/TiO2-CdS (RE=La3+, Eu3+, Er3+, Gd3+) and TiO2-CdS photocatalysts prepared by a simple mechanical mixed method. The photocatalysts properties were studied by means of ultraviolet-visible spectroscopy, photoluminiscence spectra, X-ray diffraction, transmission electron microscopy, specific surface areas and the electrochemistry method. Photocatalytic hydrogen evolution using Na2S/Na2SO3 as electron donor was investigated under visible-light (??420 nm) irradiation. The rare earth doping enhances the activities of Pt/RE/TiO2-CdS samples (with 1.0 wt% deposited Pt). Under optimum conditions, the activities of La3+, Eu3+, Er3+, Gd3+ doped composite Pt/RE/TiO2-CdS increase by 62.0%, 40.4%, 34.7% and 30.0% respectively, when compared to that of Pt/TiO2-CdS, due to the prevention of electron–hole recombination and the flat-band potential of the conduction of TiO2 shifting negatively by the doping.

Shaoqin Peng; Yahui Huang; Yuexiang Li

2013-01-01T23:59:59.000Z

36

Characterization of TiN, TiC and TiCN coatings on Ti50.6 at.% Ni alloy deposited by PIII and deposition technique  

E-Print Network (OSTI)

high content of nickel [1]. In addition, its wear resistance is expected to be improved by transition-metal as nitride, carbide and carbonitride, respectively. Based on the electrochemical measurement and ion carbides and nitrides coatings at a rather broad composition range, such as TiN, TiC and TiC1-xNx (0bÃ?b1

Zheng, Yufeng

37

Report from NA49  

E-Print Network (OSTI)

The signatures of the onset of deconfinement, found by the NA49 experiment at low SPS energies, are confronted with new results from the Beam Energy Scan (BES) program at BNL RHIC and CERN LHC results. Additionally, new NA49 results on chemical (particle ratio) fluctuations, azimuthal angle fluctuations, intermittency of di-pions, etc. are presented.

Katarzyna Grebieszkow; for the NA49 Collaboration

2011-12-04T23:59:59.000Z

38

Observation of TiH5 and TiH7 in Bulk-Phase TiH3 Gels for Kubas-Type Hydrogen Storage  

Science Journals Connector (OSTI)

Observation of TiH5 and TiH7 in Bulk-Phase TiH3 Gels for Kubas-Type Hydrogen Storage ... Table T2 provides the formulas and C, H, and Ti percentages of the hydrogenated materials in addition to those of representative stoichiometric compounds, including pure TiH3 and the starting material. ... In the TiH3 structure, the hydride ligands are a lightweight structural feature as opposed to a source of stored hydrogen, and additional hydrogen can bind via the Kubas interaction to access TiH5 and TiH7 species. ...

Tuan K. A. Hoang; Leah Morris; Daniel Reed; David Book; Michel L. Trudeau; David M. Antonelli

2013-11-14T23:59:59.000Z

39

Induction of Cytotoxicity by Photoexcited TiO2 Particles  

Science Journals Connector (OSTI)

...TiO2 in the suspension was measured with combustion analysis. The TiO2 aqueous suspension...photoexcited TiO2 particles. it did not produce heat at the irradiated site. Since TiO2 alone...Heterogeneous photocatalytic oxidation of hydrocarbons on platinized TiO2 powders. J. Phys...

Ruxiong Cai; Yoshinobu Kubota; Taro Shuin; Hideki Sakai; Kazuhito Hashimoto; and Akira Fujishima

1992-04-15T23:59:59.000Z

40

Electrochemistry properties of multilayer TiN/Ti coatings on NiTi alloy for cardiac occluder application  

E-Print Network (OSTI)

-elasticity, thermal shape memory, high corrosion and fatigue resistance, make NiTi alloy especially suitableTi alloy is a subject of numerous recent studies to improve the material's corrosion resistance as well,b , D.Y. Zhang e a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced

Zheng, Yufeng

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Highly uniform bipolar resistive switching characteristics in TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2} multilayer  

SciTech Connect

Nanoscale multilayer structure TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2} has been fabricated on Pt/Ti/SiO{sub 2}/Si substrate by chemical solution deposition method. Highly uniform bipolar resistive switching (BRS) characteristics have been observed in Pt/TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2}/Pt cells. Analysis of the current-voltage relationship demonstrates that the space-charge-limited current conduction controlled by the localized oxygen vacancies should be important to the resistive switching behavior. X-ray photoelectron spectroscopy results indicated that oxygen vacancies in TiO{sub 2} play a crucial role in the resistive switching phenomenon and the introduced TiO{sub 2}/BaTiO{sub 3} interfaces result in the high uniformity of bipolar resistive switching characteristics.

Ma, W. J.; Zhang, X. Y.; Wang, Ying; Zheng, Yue, E-mail: zhengy35@mail.sysu.edu.cn, E-mail: wangbiao@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China) [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Lin, S. P. [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China) [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Sino-French Institute of Nuclear Engineering and Technology, Zhuhai Campus, Sun Yat-Sen University, Zhuhai 519082 (China); Luo, J. M.; Wang, B., E-mail: zhengy35@mail.sysu.edu.cn, E-mail: wangbiao@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Li, Z. X. [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China)] [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China)

2013-12-23T23:59:59.000Z

42

? decay of 40Ti and 41Ti and implication for solar-neutrino detection  

Science Journals Connector (OSTI)

The ? decay of 40Ti and 41Ti was studied by measuring the ?-delayed proton and ? emission. The half-lives for 40Ti and 41Ti were determined to be 54(2) and 82(3) ms, respectively. The experimental ?-decay strengths are compared with shell-model calculations and results from other measurements. The integrated Gamow-Teller strengths for 40Ti and 41Ti were found to be quenched, compared to the calculations, by factors of 0.79(3) and 0.93(3), respectively. Based on the experimental 40Ti??-decay strength, the neutrino absorption cross section and induced neutrino event rates for 40Ar were determined to be 14.3(3)×10-43?cm2 and 9.4±0.2(stat)-1.6+1.3(syst) SNU, respectively.

W. Liu; M. Hellström; R. Collatz; J. Benlliure; L. Chulkov; D. Cortina Gil; F. Farget; H. Grawe; Z. Hu; N. Iwasa; M. Pfützner; A. Piechaczek; R. Raabe; I. Reusen; E. Roeckl; G. Vancraeynest; A. Wöhr

1998-11-01T23:59:59.000Z

43

Performance Degradation of TiN-and TiC-deposited AISI316 bipolar plates for proton exchange membrane fuel cells  

Science Journals Connector (OSTI)

TiN and TiC were deposited on AISI316 bipolar plates for proton exchange membrane fuel cells (PEMFCs) and their effects on the corrosion resistance and overall cell performance were investigated. TiN with a Ti...

Hee Yeol Lee; Jae Woong Choi; Gil Ho Hwang…

2006-04-01T23:59:59.000Z

44

Ti-based composite coatings with gradient TiC x reinforcements on TC4 titanium alloy prepared by laser cladding  

Science Journals Connector (OSTI)

TiC x -NiTi2/Ti cermet composite coatings C1 and C2 with gradient TiC x ...reinforcements were prepared on TC4 titanium alloy by laser cladding ...

ShuNv Liu; ZongDe Liu; Yang Wang; Peng Yue

2014-07-01T23:59:59.000Z

45

Corrosion resistance and friction of sintered NdFeB coated with Ti/TiN multilayers  

E-Print Network (OSTI)

Corrosion resistance and friction of sintered NdFeB coated with Ti/TiN multilayers Yuanyuan Cheng Polarization Fretting corrosion Ti/TiN multilayers were deposited on sintered NdFeB by radio frequency magnetron sputtering. The film grain size decreased with the number of multilayers in the stack. Corrosion

Volinsky, Alex A.

46

Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation  

Science Journals Connector (OSTI)

A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na 3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2 which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.

Li Wan; Jian-feng Li; Jia-you Feng; Wei Sun; Zong-qiang Mao

2008-01-01T23:59:59.000Z

47

E-Print Network 3.0 - algorithm na ordenacao Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Historic Houses College of Charleston Summary: Related Deaths 90 Wentworth Street-House 0 0 NA NA NA NA NA NA 92 Wentworth Street-House 0 0 NA NA... NA NA NA NA...

48

Calculator Tips for TI-30XA  

E-Print Network (OSTI)

TI-30XA Calculator Tips. Calculator Memory. - To use the memory function, hit the STO key to store a number in either memory 1, 2, or 3. o To store the product of ...

Owen Davis

2013-01-04T23:59:59.000Z

49

TiO2 Nanotubes/MWCNTs Nanocomposite Photocatalysts: Synthesis, Characterization and Photocatalytic Hydrogen Evolution Under UV-Vis Light Illumination  

SciTech Connect

Nanocomposite of TiO2 nanotubes (TiO2NTs) and multiwalled carbon nanotubes (MWCNTs) has been synthesized by a hydrothermal method and firstly used in photocatalytic hydrogen production. The obtained TiO2 NTs/MWCNTs composites were characterized by X-ray diffraction, transmission electron microscopy, Raman spectrum and ultraviolet-visible diffuse reflectance spectroscopy. The experimental results revealed that the MWCNTs were decorated with well dispersed anatase TiO2 nanotubes with a diameter of 8-15 nm. A slight blue shift and weak symmetry was observed for the strongest Raman peak which resulted from strain gradients originating from interface integration between TiO2 nanotubes and MWCNTs. The photocatalytic activity of the as-prepared samples was evaluated by hydrogen evolution from water splitting using Na2S and Na2SO3 as sacrificial reagents under UV-vis light irradiation. Enhanced photocatalytic activity compared with P25 has been observed for the resulted samples. The nanocomposite with optimized MWCNTs content of 1% displayed a hydrogen production rate of 161 u mol/h/g. Good photocatalytic stability of the as-synthesized samples was observed as well.

Li, Hao-Peng; Zhang, Xiao-Yan; Cui, Xiao-Li; Lin, Yuehe

2012-03-01T23:59:59.000Z

50

E-Print Network 3.0 - avastart ti traumade Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

University of South Carolina Collection: Mathematics 15 Characterization of TiN, TiC and TiCN coatings on Ti50.6 at.% Ni alloy deposited by PIII and deposition technique...

51

E-Print Network 3.0 - amorphous ni-ti alloys Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

044103 (6pp) doi:10.10881748-604134044103 Summary: .10881748-604134044103 Ti-TiC-TiCDLC gradient nano-composite film on a biomedical NiTi alloy Yufeng Zheng1,2, Dong...

52

Aluminium alloy based hydrogen storage tank operated with sodium aluminium hexahydride Na3AlH6  

Science Journals Connector (OSTI)

Abstract Here we present the development of an aluminium alloy based hydrogen storage tank, charged with Ti-doped sodium aluminium hexahydride Na3AlH6. This hydride has a theoretical hydrogen storage capacity of 3 mass-% and can be operated at lower pressure compared to sodium alanate NaAlH4. The tank was made of aluminium alloy EN AW 6082 T6. The heat transfer was realised through an oil flow in a bayonet heat exchanger, manufactured by extrusion moulding from aluminium alloy EN AW 6060 T6. Na3AlH6 is prepared from 4 mol-% TiCl3 doped sodium aluminium tetrahydride NaAlH4 by addition of two moles of sodium hydride NaH in ball milling process. The hydrogen storage tank was filled with 213 g of doped Na3AlH6 in dehydrogenated state. Maximum of 3.6 g (1.7 mass-% of the hydride mass) of hydrogen was released from the hydride at approximately 450 K and the same hydrogen mass was consumed at 2.5 MPa hydrogenation pressure. 45 cycle tests (rehydrogenation and dehydrogenation) were carried out without any failure of the tank or its components. Operation of the tank under real conditions indicated the possibility for applications with stationary HT-PEM fuel cell systems.

R. Urbanczyk; K. Peinecke; M. Felderhoff; K. Hauschild; W. Kersten; S. Peil; D. Bathen

2014-01-01T23:59:59.000Z

53

The effect of NaCl salinity on bell pepper photosynthesis  

E-Print Network (OSTI)

THE EFFECT OF NACL SALINITY ON BELL PEPPER PHOTOSYNTHESIS A Thesis by PAUL CARL BETHKE Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1989 Major Sub]ect& Plant Physiology THE EFFECT OF NACL SALINITY ON BELL PEPPER PHOTOSYNTHESIS A Thesis by PAUL CARL BETHKE Approved as to style and content by: co m rew ( Chair of Committee) ona ewton ( Member) war un ouser ( Member...

Bethke, Paul Carl

2012-06-07T23:59:59.000Z

54

Structure, Magnetism and Conductivity in Epitaxial Ti-doped ...  

NLE Websites -- All DOE Office Websites (Extended Search)

Magnetism and Conductivity in Epitaxial Ti-doped -Fe2O3 Hematite: Experiment and density functional theory Structure, Magnetism and Conductivity in Epitaxial Ti-doped -Fe2O3...

55

Oxygen Vacancies and Ferromagnetism in CoxTi–x–y...  

NLE Websites -- All DOE Office Websites (Extended Search)

Vacancies and Ferromagnetism in CoxTi–x–y. Oxygen Vacancies and Ferromagnetism in CoxTi–x–y. Abstract: Abstract: Cobalt-doped titanium dioxide, or CTO, has...

56

Asymmetry of radiation damage properties in Al-Ti nanolayers...  

NLE Websites -- All DOE Office Websites (Extended Search)

reveal significant and important asymmetries in defect production with sim60% of vacancies created in Al layers compared to Ti layers within the Al-Ti multilayer system. The...

57

TiSol | Open Energy Information  

Open Energy Info (EERE)

TiSol TiSol Jump to: navigation, search Name TiSol Place Pasadena, California Sector Solar Product California-based start up focused on the production of dye sensitized solar cells. Coordinates 29.690847°, -95.196308° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":29.690847,"lon":-95.196308,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

58

Morphology, deformation, and defect structures of TiCr{sub 2} in Ti-Cr alloys  

SciTech Connect

The morphologies and defect structures of TiCr{sub 2} in several Ti-Cr alloys have been examined by optical metallography, x-ray diffraction, and transmission electron microscopy (TEM), in order to explore the room-temperature deformability of the Laves phase TiCr{sub 2}. The morphology of the Laves phase was found to be dependent upon alloy composition and annealing temperature. Samples deformed by compression have also been studied using TEM. Comparisons of microstructures before and after deformation suggest an increase in twin, stacking fault, and dislocation density within the Laves phase, indicating some but not extensive room-temperature deformability.

Chen, K.C.; Allen, S.M.; Livingston, J.D.

1992-12-31T23:59:59.000Z

59

Dampfdruckmessungen und Protonenresonanzuntersuchung an Hydriden der intermetallischen Phasen Ti2(Ni, Co) und Ti2(Ni, Fe)  

Science Journals Connector (OSTI)

NMR and hydrogen equilibrium pressure measurements were performed on hydrides of the intermetallic compounds Ti2(Ni, Co) and Ti2(Ni, Fe). The following values of enthalpy ?H and entropy ?S for the formation of th...

Engelbert Tuscher; Kurt Hiebl; Helmut Bittner

1981-02-01T23:59:59.000Z

60

Synthesis of Ti-based electrodes using Ti-salt flocculated sludge and their application in lithium-ion batteries  

SciTech Connect

We report a simple strategy to synthesize the nanostructured TiO{sub 2} samples by a solid state reaction using Ti-salt flocculated sludge. The structure and morphology of the Ti-salt flocculated sludge, nanostructured TiO{sub 2} samples and pure commercial Aldrich TiO{sub 2} powder were characterized by powder X-ray diffraction and field emission scanning electron microscopy (FE-SEM). The electrochemical performances were evaluated in coin type cells. Nanostructured TiO{sub 2} samples, obtained by Ti-salt flocculated sludge shows a higher capacity and better cycling performances than pure commercial Aldrich TiO{sub 2} powder at the cutoff of 1.0–2.5 V especially at high current rate. The enhanced cycling performance can be attributed to the facts that their high crystallinity and uniform nano-sized distribution.

Kang, Jungwon; Rai, Alok Kumar; Kim, Sungjin; Choi, Eunseok; Yoo, Insun [Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of)] [Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of); Kim, Jongho [School of Applied Chemical Engineering and the Research Institute for Catalysis, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of)] [School of Applied Chemical Engineering and the Research Institute for Catalysis, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of); Kim, Jaekook, E-mail: jaekook@chonnam.ac.kr [Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of)] [Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757 (Korea, Republic of)

2012-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Band Offsets at the Epitaxial Anatase TiO2/n-SrTiO3(001) Interface...  

NLE Websites -- All DOE Office Websites (Extended Search)

to measure valence band offsets at the epitaxial anatase TiO2(002)n-SrTiO3(001) heterojunction prepared by molecular beam epitaxy, Within experimental error, the valance band...

62

Carrier-Controlled Ferromagnetism in SrTiO3  

Magnetotransport and superconducting properties are investigated for uniformly La-doped SrTiO3 films and GdTiO3/SrTiO3 heterostructures, respectively. GdTiO3/SrTiO3 interfaces exhibit a high-density 2D electron gas on the SrTiO3 side of the interface, while, for the SrTiO3 films, carriers are provided by the dopant atoms. Both types of samples exhibit ferromagnetism at low temperatures, as evidenced by a hysteresis in the magnetoresistance. For the uniformly doped SrTiO3 films, the Curie temperature is found to increase with doping and to coexist with superconductivity for carrier concentrations on the high-density side of the superconducting dome. The Curie temperature of the GdTiO3/SrTiO3 heterostructures scales with the thickness of the SrTiO3 quantum well. The results are used to construct a stability diagram for the ferromagnetic and superconducting phases of SrTiO3.

Moetakef, Pouya; Williams, James R.; Ouellette, Daniel G.; Kajdos, Adam P.; Goldhaber-Gordon, David; Allen, S. James; Stemmer, Susanne

2012-06-01T23:59:59.000Z

63

Ab initio Molecular Dynamics and Elastic Properties of TiC and TiN Nanoparticles A. V. Postnikov and P. Entel  

E-Print Network (OSTI)

Ab initio Molecular Dynamics and Elastic Properties of TiC and TiN Nanoparticles A. V. Postnikov composition and compared to frozen phonon and molecular dynamics calculations for crystalline TiC and Ti range of frequencies, including the phonon band gap of pure crystalline TiC (near 15 THz). Similar

Entel, P.

64

Original article Soybean impairs Na  

E-Print Network (OSTI)

flour (HSF), or ethanol heat-treated soybean protein concentrate (SPC). The Na+ -dependent glucose co. In conclusion, soybean contains ethanol-sensitive heat-insensitive compounds impairing Na+ -dependent glucose absorption in the jejunum and ileum, and ethanol- and heat-insensitive compounds causing an acute impairment

Boyer, Edmond

65

Combustion synthesis/quasi-isostatic pressing of TiC0.7NiTi cermets: microstructure and transformation characteristics  

E-Print Network (OSTI)

Combustion synthesis/quasi-isostatic pressing of TiC0.7­NiTi cermets: microstructure Abstract TiC0.7­NiTi cermets were produced by com- bustion synthesis followed by quasi-isostatic consolidation while the reaction products were still hot and ductile. The TiC0.7­NiTi cermets were characterized

Meyers, Marc A.

66

N NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG  

NLE Websites -- All DOE Office Websites (Extended Search)

NE NE EX XT T G GE EN NE ER RA AT TI IO ON N S SA AF FE EG GU UA AR RD DS S I IN NI IT TI IA AT TI IV VE E ( (N NG GS SI I) ) O OP PP PO OR RT TU UN NI IT TI IE ES S F FO OR R S ST TU UD DE EN NT TS S A AN ND D Y YO OU UN NG G P PR RO OF FE ES SS SI IO ON NA AL LS S I IN NT TE ER RE ES ST TE ED D I IN N S SA AF FE EG GU UA AR RD DS S/ /N NO ON NP PR RO OL LI IF FE ER RA AT TI IO ON N The Next Generation Safeguards Initiative (NGSI) was launched by the National Nuclear Security Administration (NNSA) in FY 2008 to develop the policies, concepts, technologies, expertise, and infrastructure necessary to strengthen and sustain the international safeguards system as it evolves to meet new challenges over the next 25 years. NGSI's Human Capital Development subprogram 1 aims to revitalize and expand the international safeguards human capital base in the United States by attracting, educating, training, and retaining

67

Upper critical field of Ti and ?-TiAl alloys: Evidence of an intrinsic type-II superconductivity in pure Ti  

Science Journals Connector (OSTI)

The upper critical field Hc2 of ?-Ti1-xAlx(0Fermi velocity obtained here is substantially lower than predicted by band calculation. The present work gives clear evidence that pure Ti is an intrinsic type-II superconducting element due to its very low renormalized Fermi velocity.

Liu Shumei; Zhang Dianlin; Jing Xiunian; Lu Li; Li Shanlin; Kang Ning; Wu Xiaosong; J. J. Lin

2000-10-01T23:59:59.000Z

68

Structure and ductility of TiAl  

SciTech Connect

The effect of structural factors (grain size and grain boundary structure) and strain rate on the deformation mechanism and ductility of TiAl in the temperature range of brittle-to-ductile transition and at room temperature was systematically investigated. It has been established that it is possible to substantially affect the deformation mechanism and ductility of this intermetallic by controlling structural factors, particularly the grain size, and varying the strain rate.

Imayev, R.; Salishchev, G.; Imayev, V.; Shagiev, M.; Kuznetzov, A. [Inst. for Metals Superplasticity Problems, Ufa (Russian Federation)

1995-12-31T23:59:59.000Z

69

Photocatalytic H2 production from ethanol over Au/TiO2 and Ag/TiO2  

Science Journals Connector (OSTI)

This paper compares the photocatalytic activities of Au/TiO2 (Au loadings 0-4 wt.%) and Ag/TiO2 photocatalysts (Ag loadings 0-4 wt.%) for H2 production from ethanol-water mixtures under UV irradiation. Au and Ag nanoparticles were deposited on commercially available Degussa P25 TiO2 (85% anatase, 15% rutile) using deposition-precipitation and liquid impregnation methods, respectively. TEM analyses showed the average noble metal nanoparticle size to be ~5 nm for the Au/TiO2 photocatalysts and ~3 nm for the Ag/TiO2 photocatalysts. Au/TiO2 photocatalysts showed a strong localised surface plasmon resonance (LSPR) at 570 nm characteristic for nanocrystalline Au. Complementary XRD studies confirmed that Au and Ag nanoparticles were present in metallic form. Photoluminescence measurements revealed that Au and Ag nanoparticles effectively suppress electron-hole recombination in TiO2, thereby enhancing the photocatalytic activity of TiO2 for hydrogen production. Au/TiO2 photocatalysts were far more active for H2 production from ethanol-water mixtures than Ag/TiO2 photocatalysts. A 1 wt.% Au/TiO2 photocatalyst yielded the highest H2 production rate (34 mmol g?1 h?1). Amongst the Ag/TiO2 photocatalysts, the 2 wt.% Ag/TiO2 sample was the most active (3.7 mmol g?1 h?1). Results are rationalised in terms of differences in the electronic properties of supported Au and Ag nanoparticles, with the former being near ideal for H2 production.

Vedran Jovic; Pei-Huan Hsieh; Wan-Ting Chen; Dongxiao Sun-Waterhouse; Tilo Söhnel; Geoffrey I.N. Waterhouse

2014-01-01T23:59:59.000Z

70

Effects of TiCl4 Purity on the Sinterability of Armstrong-Processed Ti Powder  

SciTech Connect

A series of high purity and low purity powders were synthesized from TiCl4 by the Armstrong process. While both powders displayed swelling when consolidated and sintered, the lower purity powder exhibited this phenomenon in significantly lower degree. The improvement is attributed to the increase in the onset of sintering temperature, which mitigates the entrapment of volatile impurities that would otherwise lead to pore formation and growth. The net effect is that the use of a lower purity TiCl4 may beneficial in two ways: (1) it is a potentially lower cost precursor to Ti powder production and (2) the trace impurities allow higher density components to be fabricated via a typical low-cost press and sinter approach.

Weil, K. Scott; Hovanski, Yuri; Lavender, Curt A.

2009-04-03T23:59:59.000Z

71

Molecular Hydrogen Formation from Proximal Glycol Pairs on TiO2...  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Formation from Proximal Glycol Pairs on TiO2(110). Molecular Hydrogen Formation from Proximal Glycol Pairs on TiO2(110). Abstract: Understanding hydrogen formation on TiO2...

72

Microstructure and mechanical properties of Ni-based composite coatings reinforced by in situ synthesized TiB2 + TiC by laser cladding  

Science Journals Connector (OSTI)

A Ni-based composite coating reinforced by in situ synthesized TiB2...and TiC particles was fabricated on Ti6Al4V by laser cladding. An attempt was made to correlate the...2, flower-like or equiaxial TiC, and fin...

Jun Li; Xuan-jun Zhang; Hui-ping Wang…

2013-01-01T23:59:59.000Z

73

A New Method of Low Cost Production of Ti Alloys to Reduce Energy...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

or otherwise restricted information. Project Objective Develop a novel low cost method for manufacturing Ti Demonstrate the mechanical properties of Ti using the...

74

Film Coating Process Research and Characterization of TiN Coated Racetrack-type Ceramic Pipe  

E-Print Network (OSTI)

TiN film was coated on the internal face of racetrack-type ceramic pipe by three different methods: radio-frequency sputtering, DC sputtering and DC magnetron sputtering. The deposition rates of TiN film under different coating methods were compared. According to the AFM, SEM, XPS test results,these properties were analyzed, such as TiN film roughness and surface morphology. At the same time, the deposition rates were studied under two types' cathode, Ti wires and Ti plate. According to the SEM test results, Ti plate cathode can improve the TiN/Ti film deposition rate obviously.

Wang, Jie; Zhang, Bo; Wei, Wei; Fan, Le; Pei, Xiangtao; Hong, Yuanzhi; Wang, Yong

2015-01-01T23:59:59.000Z

75

Tetraoxygen on Reduced Ti02(110): Oxygen Adsorption and Reactions...  

NLE Websites -- All DOE Office Websites (Extended Search)

Tetraoxygen on Reduced Ti02(110): Oxygen Adsorption and Reactions with Oxygen Vacancies. Tetraoxygen on Reduced Ti02(110): Oxygen Adsorption and Reactions with Oxygen Vacancies....

76

Understanding the effect of halide poisoning in CO oxidation over Au/TiO[subscript 2  

SciTech Connect

The effect of halide poisoning of Au/TiO{sub 2} catalysts in low temperature CO oxidation was investigated using bromide as the poison and a combination of X-ray absorption spectroscopy (XANES and EXAFS), quantitative CO adsorption, and catalytic measurements. It was found that halide prevented full reduction of cationic Au by displacing oxyhydroxy ligands and remaining bound to Au during low temperature reduction, causing a reduction in catalytic activity. On reduced Au samples, bromide (likely as NaBr molecule) was preferentially adsorbed on Au and not on TiO{sub 2}, and suppressed both the adsorption of CO and the catalytic activity. At low Br contents, each adsorbed Br suppressed adsorption of three CO, suggesting that Br was adsorbed on three-fold sites but the effect decreased with increasing Br content possibly due to crowding of adsorbed Br. When 5--10% of the Au was bound to Br, the catalytic activity was completely blocked, although {approx}35% of the original CO adsorption capacity remained. The data suggest that not all CO adsorption sites are catalytic active sites, and are consistent with the perimeter Au atoms at/near the particle-support interface (perimeter) being active sites.

Oxford, S.M.; Henao, J.D.; Yang, J.H.; Kung, M.C.; Kung, H.H. (NWU)

2008-07-08T23:59:59.000Z

77

O Ti-tE LOVE  

Office of Legacy Management (LM)

' ItqQtJulRl' IICt' O Ti-tE LOVE ~t?Al. . . At2D Al.CLkTED IChTTEtt~ . ' . . . : . ' . i I . . . . .mr TttE HOt\' ORAULE~ STANLEY FItZl:; SFCAKER ' . : ,J WE\J i' ORti STATE ASSH' rtrLY l r . . isay 29,.1980 Consultant to the Kew York ' , .' .I, " ..' . ,"' ! -. . . : . . . I.. . . . . ~. ,:- 9.. :. .' , * Ill . ,.. , ,i / All . ' %: : . : . . -. ;:. * :... . _ -. .' . . . I . ' J n' f armed. ?%c firtdingo and backup documentatiin embodied in thi preliminafy report compel the Task Yorao to call trprm ym; thr: . . I SpcnXer, to cwthorim crnd ompowcr the Assemly Sta?ding,CozmiCte I ' . : ,. . ..: .I' .,' :. .~.. ,:. :,-"'. ; ..d ::. . . .~~ ' .,' .' . : ' , ' ..,, -. . -. . . : : ? :. . . . .; *. . 1 ,.' .i. . . : \. .- :. " ' . . . c. : . I ! .'

78

Electron energy loss study of TiC[111].  

SciTech Connect

The electron energy loss (EEL) spectra of TiC (111) were measured over a wide range of electron primary energies. The electron energy losses below 16 eV were analyzed using the theoretical band calculations of Price and Cooper [11]. The volume and surface plasma excitations were identified from their electron primary energy dependence. Energy losses due to core electrons autoinization effects were identified above 35 eV. We observed a difference in the electronic structure of the surface vs. the bulk of TiC. The temperature dependence of the EEL spectra was studied between 300 to 1250 K. The reaction of the TiC surface with ethylene and oxygen was also investigated. The ethylene bonding to the TiC surface was found to be very weak. There is evidence of the formation of surface defects on the TiC (111) surface at high temperatures.

Chan, Y.; Lee, S. W.; Liao, D.; Cooper, B. R.; Montano, P. A.; Materials Science Division; Brooklyn Coll. of City Univ. of New York; West Virginia Univ.

1992-01-01T23:59:59.000Z

79

Nanolayered CrAlTiN and multilayered CrAlTiN–AlTiN coatings for solid particle erosion protection  

Science Journals Connector (OSTI)

Abstract Applying hard coatings on airfoil surfaces is proven to be an effective approach to mitigating erosion damage to engine components. Nanolayered or multilayered coatings, because of their capability of tailoring hardness and toughness through modifications in the chemistry and architecture of layer constituents, have been explored as potential candidates for this specific application. In this study, nanolayered CrAlTiN (CrN/AlTiN) coatings with different modulation periods, along with multilayered CrAlTiN–AlTiN coatings having different number of layers and different thickness of individual layers, were fabricated, characterized and evaluated. All the coatings significantly outperformed the CrN baseline in erosion resistance, and their performance was strongly affected by the bilayer period of the nanolayered coatings or the layer architectural characteristics of multilayered coatings.

Q. Yang; R. McKellar

2015-01-01T23:59:59.000Z

80

Thermodynamics of the solid solution of hydrogen in ?-titanium alloys: ?-TiMo and ?-TiRe  

Science Journals Connector (OSTI)

The solid solution of hydrogen has been investigated in a series of random ?-TiMo alloys ranging from 0–65 atom % Mo via determination of pressure-composition-temperature relationships; additionally, one (?-TiRe alloy (Ti37 atom % Re) was investigated. The thermodynamic parameters of hydrogen solution were generated from the p-c-T data. The relative partial molar enthalpy at infinite dilution, ?H?Ho, exhibited by ?-TiMo alloys were adjusted to conditions of fixed volume, that of pure ?-Ti. It was found that variations in the resulting ?E?Ho correlated roughly with variations in the electron density of states at the Fermi level. The relative partial molar entropy at infinite dilution was found to vary linearly with Mo content and it is suggested that this trend reflects a blocking of potentially available interstitial sites to hydrogen occupation by Mo atoms at small hydrogen contents. Examination of the excess free energy vs hydrogen content relationships indicates that effects resulting from accommodation of hydrogen electrons by the metal conduction band are significant even at small hydrogen contents in the TiMo alloys; thus, explicit determination of the H-H interaction is not possible in the alloys. By contrast, electronic effects in pure ?-Ti are negligible at small HM and under fixed volume conditions, the H-H interactions in ?-Ti are attractive.

J.F. Lynch; J. Tanaka

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

LABORATRIOS NA RUA 26 de Novembro, segunda  

E-Print Network (OSTI)

LABORAT�RIOS NA RUA 26 de Novembro, segunda IST Alameda ­ Anfiteatro do Complexo Interdisciplinar ORGANIZA��O �MBITO LABORAT�RIOS NA RUA ­ IST Breve apresentação dos Laboratórios na Rua ­ uma plataforma universitária, sem fins lucrativos, de voluntariado e intervenção social LABORAT�RIOS NA RUA ­ IST Exemplos de

Instituto de Sistemas e Robotica

82

Phase equilibria, formation, crystal and electronic structure of ternary compounds in Ti-Ni-Sn and Ti-Ni-Sb ternary systems  

SciTech Connect

The phase equilibria of the Ti-Ni-Sn and Ti-Ni-Sb ternary systems have been studied in the whole concentration range by means of X-ray and EPM analyses at 1073 K and 873 K, respectively. Four ternary intermetallic compounds TiNiSn (MgAgAs-type), TiNi{sub 2-x}Sn (MnCu{sub 2}Al-type), Ti{sub 2}Ni{sub 2}Sn (U{sub 2}Pt{sub 2}Sn-type), and Ti{sub 5}NiSn{sub 3} (Hf{sub 5}CuSn{sub 3}-type) are formed in Ti-Ni-Sn system at 1073 K. The TiNi{sub 2}Sn stannide is characterized by homogeneity in the range of 50-47 at% of Ni. The Ti-Ni-Sb ternary system at 873 K is characterized by formation of three ternary intermetallic compounds, Ti{sub 0.8}NiSb (MgAgAs-type), Ti{sub 5}Ni{sub 0.45}Sb{sub 2.55} (W{sub 5}Si{sub 3}-type), and Ti{sub 5}NiSb{sub 3} (Hf{sub 5}CuSn{sub 3}-type). The solubility of Ni in Ti{sub 0.8}NiSb decreases number of vacancies in Ti site up to Ti{sub 0.91}Ni{sub 1.1}Sb composition. - Graphical abstract: Isothermal section of the Ti-Ni-Sn phase diagram and DOS distribution in hypothetical TiNi{sub 1+x}Sn solid solution. Highlights: Black-Right-Pointing-Pointer Ti-Ni-Sn phase diagram was constructed at 1073 K. Black-Right-Pointing-Pointer Four ternary compounds are formed: TiNiSn, TiNi{sub 2-x}Sn, Ti{sub 2}Ni{sub 2}Sn, and Ti{sub 5}NiSn{sub 3}. Black-Right-Pointing-Pointer Three ternary compounds exist in Ti-Ni-Sb system at 873 K. Black-Right-Pointing-Pointer The TiNi{sub 2}Sb compound is absent.

Romaka, V.V., E-mail: romakav@yahoo.com [Department of Materials Engineering and Applied Physics, Lviv Polytechnic National University, Ustyyanovycha Str. 5, 79013 Lviv (Ukraine); Rogl, P. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Romaka, L.; Stadnyk, Yu. [Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodiya Str. 6, 79005 Lviv (Ukraine); Melnychenko, N.; Grytsiv, A.; Falmbigl, M. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Skryabina, N. [Perm State University, Bukireva Str. 15, 614990 Perm (Russian Federation)

2013-01-15T23:59:59.000Z

83

Measurement of neutron capture on 50Ti at thermonuclear energies  

E-Print Network (OSTI)

At the Karlsruhe and Tuebingen 3.75 MV Van de Graaff accelerators the thermonuclear 50Ti(n,gamma)51Ti(5.8 min) cross section was measured by the fast cyclic activation technique via the 320.852 and 928.65 keV gamma-ray lines of the 51Ti-decay. Metallic Ti samples of natural isotopic composition and samples of TiO2 enriched in 50Ti by 67.53 % were irradiated between two gold foils which served as capture standards. The capture cross-section was measured at the neutron energies 25, 30, 52, and 145 keV, respectively. The direct capture cross section was determined to be 0.387 +/- 0.011 mbarn at 30 keV. We found evidence for a bound state s-wave resonance with an estimated radiative width of 0.34 eV which destructively interfers with direct capture. The strength of a suggested s-wave resonance at 146.8 keV was determined. The present data served to calculate, in addition to the directly measured Maxwellian averaged capture cross sections at 25 and 52 keV, an improved stellar 50Ti(n,gamma)51Ti rate in the thermonuclear energy region from 1 to 250 keV. The new stellar rate leads at low temperatures to much higher values than the previously recommended rate, e.g., at kT=8 keV the increase amounts to about 50 %. The new reaction rate therefore reduces the abundance of 50Ti due to s-processing in AGB stars.

P. V. Sedyshev; P. Mohr; H. Beer; H. Oberhummer; Yu. P. Popov; W. Rochow

1999-07-28T23:59:59.000Z

84

Characterization and catalytic performance of vanadium supported on sulfated Ti-PILC catalysts issued from different Ti-precursors in selective catalytic reduction of nitrogen oxide by ammonia  

Science Journals Connector (OSTI)

Vanadium supported on sulfated Ti-pillared clay catalysts (STi-PILCs) issued from different Ti-precursors were investigated for selective catalytic reduction (SCR) of NO by NH3 in the presence of O2. The STi-PILC...

J. Arfaoui; L. Khalfallah Boudali; A. Ghorbel; G. Delahay

2009-12-01T23:59:59.000Z

85

??e¦ia e e ¡et ??? oa¦0 to 3i5¦ontinBoB5 Pie¦eFi5e Hinea ¢tiTiUation ...  

E-Print Network (OSTI)

Pie¦eFi5e Hinea ¢tiTiUation. I.R. de Farias JR., M. ?hao, and H. ?hao. State University of New York at jumalo. {defariasy m|haoy |hon??ia}@??ffalo.ed?.

86

Nature of Transactions (TI) Code | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Nature of Transactions (TI) Code | National Nuclear Security Administration Nature of Transactions (TI) Code | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nature of Transactions (TI) Code Home > About Us > Our Programs > Nuclear Security > Nuclear Materials Management & Safeguards System > NMMSS Information, Reports & Forms > Code Tables > Nature of Transactions (TI) Code

87

TI--CR--AL--O thin film resistors  

DOE Patents (OSTI)

Thin films of Ti--Cr--Al--O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti--Cr--Al--O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti--Cr--Al--O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti--Cr--Al--O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solana Beach, CA)

2000-01-01T23:59:59.000Z

88

Low thermal expansion behavior and thermal durability of ZrTiO4Al2TiO5Fe2O3 ceramics between 750 and 1400  

E-Print Network (OSTI)

2002 Abstract The thermal-shock-resistant materials in the system Al2TiO5­ZrTiO4 (ZAT) were synthesized Aluminum titanate (Al2TiO5) is well-known as an excellent thermal shock-resistant material, resulting from. All rights reserved. Keywords: Al2TiO5; Thermal expansion; Thermal shock resistance 1. Introduction

Cao, Guozhong

89

Dynamic recrystallization and superplasticity in TiAl  

SciTech Connect

The effect of structural factors (grain size, grain boundary structure and fraction of the second phase) on dynamic recrystallization and superplasticity in the TiAl intermetallic alloy was studied. The possibilities of the formation of submicrocrystalline structure and the abrupt decrease of the superplastic temperature were shown. It was established that the occurrence of dynamic recrystallization and superplastic flow led to the formation of homogeneous microstructure and the improvement of low-temperature ductility in TiAl.

Salishchev, G.; Imayev, R.; Imayev, V.; Shagiev, M. [Inst. for Metals Superplasticity Problems, Ufa (Russian Federation)

1995-12-31T23:59:59.000Z

90

Carbide precipitation in gamma-TiAl alloys  

SciTech Connect

Carbide precipitation in gamma-TiAl is observed and found to involve the formation of coherent, rod-shaped perovskite precipitates as a metastable transition phase. At temperatures above 750 deg C, the formation of plate-shaped H-phase particles on dislocations and grain boundaries is accompanied by dissolution of the perovskite precipitate dispersions. This temperature regime includes possible service temperatures for gamma-TiAl-based alloys. 10 refs.

Chen, S.; Beaven, P.A.; Wagner, R. (GKSS-Forschungszentrum Geesthacht GmbH, (Germany))

1992-04-01T23:59:59.000Z

91

Superhydrophilic TiO2 surface without photocatalytic activation  

NLE Websites -- All DOE Office Websites (Extended Search)

Superhydrophilic TiO2 surface without photocatalytic activation Superhydrophilic TiO2 surface without photocatalytic activation Title Superhydrophilic TiO2 surface without photocatalytic activation Publication Type Journal Article Year of Publication 2010 Authors Zormpa, Vasileia, Xiaobo Chen, and Samuel S. Mao Journal Applied Physics Letter Volume 96 Issue 9 Date Published 12/2009 Abstract Since the discovery of extreme surface wetting phenomenon induced by ultraviolet photocatalysis, TiO2 has become the material of choice for environmental friendly applications such as self-cleaning coatings. Nevertheless, it remains a significant challenge to realize surfaces exhibiting persistent superhydrophilicity but without the need of external stimuli. We report a bioinspired TiO2 nanostructure that shows extreme superhydrophilicity without the need of light activation, and with stability against successive wetting-dewetting cycles. This ultimate TiO2 wetting surface exhibits high transmittance from near ultraviolet to the infrared, thus enabling practical antifogging technologies where transparency is critical.

92

Weldability and toughness assessment of Ti-microalloyed offshore steel  

SciTech Connect

The present study has been carried out to investigate the coarse-grained heat-affected zone (CGHAZ) microstructure and crack tip opening displacement (CTOD) toughness of grade StE 355 Ti-microalloyed offshore steels. Three parent plates (40-mm thick) were studied, two of which had Ti microalloying with either Nb + V or Nb also present. As a third steel, conventional StE 355 steel without Ti addition was welded for comparison purposes. Multipass tandem submerged arc weld (SAW) and manual metal arc weld (SMAW) welds were produced. Different heat-affected zone (HAZ) microstructures were simulated to ascertain the detrimental effect of welding on toughness. All HAZ microstructures were examined using optical and electron microscopy. It can be concluded that Ti addition with appropriate steel processing, which disperses fine TiN precipitates uniformly, with a fine balance of other microalloying elements and with a Ti/N weight ratio of about 2.2, is beneficial for HAZ properties of StE 355 grade steel.

Rak, I.; Gliha, V. [Univ. of Maribor (Slovenia). Faculty of Mechanical Engineering; Kocak, M. [GKSS Research Center Geesthacht (Germany)

1997-01-01T23:59:59.000Z

93

Shape memory behavior of ultrafine grained NiTi and TiNiPd shape memory alloys  

E-Print Network (OSTI)

The cyclic instability in shape memory characteristics of NiTi-based shape memory alloys (SMAs), such as transformation temperatures, transformation and irrecoverable strains and transformation hysteresis upon thermal and mechanical cycling limits...

Kockar, Benat

2009-05-15T23:59:59.000Z

94

Laser Cladding of TiAl Intermetallic Alloy on Ti6Al4V -Process Optimization and Properties  

Science Journals Connector (OSTI)

Abstract In order to improve Ti6Al4V high-temperature resistance and its tribological properties, the deposition of TiAl intermetallic (Ti-48Al-2Cr-2Nb) coating on a Ti6Al4V substrate by coaxial laser cladding has been investigated. Laser cladding by powder injection is an emerging laser material processing technique that allows the deposition of thick protective coatings on substrates,using a high power laser beam as heat source. Laser cladding is a multiple-parameter-dependent process. The main process parameters involved (laser power, powder feeding rate, scanning speed and preheating temperature) has been optimized. The microstructure and geometrical quantities (clad area and dilution) of the coating was characterized by optical microscopy and scanning electron microscopy (SEM). In addition the cooling rate of the clad during the process was measured by a dual-color pyrometer. This result has been related to defectology and mechanical coating properties.

B. Cárcel; A. Serrano; J. Zambrano; V. Amigó; A.C. Cárcel

2014-01-01T23:59:59.000Z

95

Investigation of the reaction zone between TiAl and Mo  

SciTech Connect

Pure Mo was incorporated in TiAl matrix via two different routes: (1) hot pressing of alternately sandwiched Ti-Al sheets and Mo foils; and (2) coextrusion and heat treatment of Ti-Al green compact and Mo rod. The reaction zone between TiAl and Mo is found to contain two intermetallic phases: {beta}-(Mo,Ti)Al and {rho}-(Mo,Ti){sub 3}Al. The {beta}-{rho} boundary is incoherent, whereas the TiAl-{beta} and {rho}-Mo boundaries are semicoherent. The reaction zone grows with increasing heat-treatment time in a parabolic form. The incorporated Mo exhibits lower hardness than the TiAl matrix, implying that ductilizing and toughening of TiAl by introducing Mo as a ductile reinforcement are possible.

Hsu, F.Y.; Klaar, H.J. [Aachen Univ. of Technology (Germany); Wang, G.X. [Zhejiang Univ., Hangzhou (China). Dept. of Materials Science and Engineering; Pirwitz, F. [GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research

1996-08-01T23:59:59.000Z

96

The Allende meteorite: evidence for a new cosmothermometer based on Ti3+/Ti4+  

Science Journals Connector (OSTI)

... 1,765 Perovskite CaTiO3 1,647 1,393 Melilite Ca2Al2SiO7- 1,625 1,450 Ca2MgSi2O7 Spinel MgAl2O4 1,513 1,362 Metallic iron Fe(Fe-Ni) 1,473 Diopside CaMgSi2O6 ... rhonite and fassaite compositions are for rhonites that have decomposed to fassaite + perovskite + spinel. Open circles represent intra-crystalline fassaites. The dashed line marked ALL-4 is the ...

Stephen E. Haggerty

1978-11-16T23:59:59.000Z

97

Visible-Light Responsive Photocatalytic Fuel Cell Based on Ag/TiO2-NTs Photoanode and Cu2O/TiO2 Photocathode for Simultaneous Wastewater Treatment and Electricity Generation  

Science Journals Connector (OSTI)

A visible-light driven photocatalytic fuel cell (PFC) system comprised of Ag/TiO2-NTs photoanode and Cu2O/TiO2/Ti photocathode was established for providing a self-sustained and...

Liao, Wenjuan

98

PrOfeSSiOnaL certificate in SuStainaBiLityfOr  

E-Print Network (OSTI)

Examines environmental sustainability at a global and national level. Studies the Green Building movement and the development of the building rating systems. Provides core/foundational knowledge in Sustainability an increasingly significant core concept for the building industry. Green initiatives and practices continue

99

Magneto-transport in LaTi{sub 1?x}Mn{sub x}O{sub 3}/SrTiO{sub 3} oxide heterostructures  

SciTech Connect

We report the growth of ultrathin film of Mn doped LaTiO{sub 3} on TiO{sub 2} terminated SrTiO{sub 3} (001) substrate by pulsed laser deposition (PLD) and their electrical transport characteristics including magnetoresistance (MR). Though the replacement of Mn in LaTiO{sub 3} at the Ti site in dilute limit does not affect the metallic behaviour of films but variation in resistance is observed. Normalised resistance behaviour is explained on the basis of variation in charge carriers and increased interaction between Mn atoms in the system under investigation.

Kumar, Pramod, E-mail: pramodnpl2011@gmail.com; Dogra, Anjana, E-mail: pramodnpl2011@gmail.com; Budhani, R. C., E-mail: pramodnpl2011@gmail.com [Quantum Phenomena and Applications Division, National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, New Delhi-110012 (India)

2014-04-24T23:59:59.000Z

100

Hexaferrite M (Co, Ti) magnetic properties optimization  

SciTech Connect

Barium hexaferrites are anisotropic iron oxides which can present high values of permeability. We have studied Ba (Co, Ti){sub x}Fe{sub 12-2x}O{sub 19} compositions. Powders are synthesized using the ceramic method: stoichiometric amounts of basic components are ground and fired at high temperature (1170{degrees}C) to obtain the desired phase. The powders are then ground for 6 hours in order to reduce the particle size. The slurry is cast in a plaster matrix. This matrix is rotated between the poles of a stationary electromagnet. Fields of approximately 500 Oe are used for the orientation procedure. Samples are then sintered for different temperatures between 1200 and 1300{degrees}C. We present results (magnetization, permeability, permittivity, orientation rate) obtained for diverse compositions (1.1

Autissier, D.; Rousselle, D.; Podembski, A. [CEA-DAM, Bruyeres-le-Chatel (France)

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

2012 Annual Workforce Analysis and Staffing Plan Report - NNSA NA-00 and NA-10  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Last printed 1/24/2013 10:50:00 AM Page 1 of 12 Last printed 1/24/2013 10:50:00 AM Page 1 of 12 Part 1. NA-00/NA-10/NA-15 Input Annual Workforce Analysis and Staffing Plan Report As of December 31, 2012 Reporting Offices: NNSA NA-10 HQ (including NA-15 inputs) and NA-00 (while transitioning to new organizational structure) Section One: Current Mission(s) of the Organization and Potential Changes NNSA Mission: To strengthen United States security through the military application of nuclear energy. NNSA Vision: To be an integrated nuclear security enterprise operating an efficient and agile nuclear weapons complex, recognized as preeminent in technical leadership and program management. Organizational Changes: NNSA is in the final phase of another re-organization that will split NA- 10 and establish an independent office, NA-00, to oversee the NNSA sites and other non-weapons-

102

New Improved Equations For Na-K, Na-Li And Sio2 Geothermometers By Outlier  

Open Energy Info (EERE)

Improved Equations For Na-K, Na-Li And Sio2 Geothermometers By Outlier Improved Equations For Na-K, Na-Li And Sio2 Geothermometers By Outlier Detection And Rejection Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: New Improved Equations For Na-K, Na-Li And Sio2 Geothermometers By Outlier Detection And Rejection Details Activities (1) Areas (1) Regions (0) Abstract: We present new improved equations for three still widely used Na/K, Na/Li and SiO2 geothermometers (obtained by statistical treatment of the data and application of outlier detection and rejection as well as theory of error propagation) and compare them with those by Fournier and others. New equations are also developed for estimating errors associated with the use of these new geothermometric equations and comparing them with the performance of the original equations. The errors in the use of the new

103

Correlation between Microstructure and Mechanical Properties of TiC Films Produced by Vacuum arc Deposition and Reactive Magnetron Sputtering  

E-Print Network (OSTI)

and mechanical properties of TiC films produced by vacuumstudied the synthesis of TiC films by vacuum arc depositionproduced a broad range of TiC x film compositions. In both

Monteiro, O.R.; Delplancke-Ogletree, M.P.; Winand, R.; Brown, I.G.

1999-01-01T23:59:59.000Z

104

The Influence of Ni-Coated TiC on Laser-Deposited IN625 Metal Matrix Composites  

E-Print Network (OSTI)

The In?uence of Ni-Coated TiC on Laser-Deposited IN625 Metalwith Ni-coated and uncoated TiC reinforcement particles toand spatial distribution of TiC particles in the deposited

2010-01-01T23:59:59.000Z

105

E-Print Network 3.0 - akot ti alloy Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

666670 Phase transformation and precipitation in aged TiNiHf Summary: in aged Ti-Ni-Hf high-temperature shape memory alloys X.L. Meng, W. Cai, Y.F. Zheng, L.C. Zhao...

106

The Synthesis of Ag-Doped Mesoporous TiO2 . | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

The Synthesis of Ag-Doped Mesoporous TiO2 . The Synthesis of Ag-Doped Mesoporous TiO2 . Abstract: Ag-doped mesoporous titanium oxide was prepared using non-ionic surfactants and...

107

The Synthesis of Cadmium Doped Mesoporous TiO2. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

The Synthesis of Cadmium Doped Mesoporous TiO2. The Synthesis of Cadmium Doped Mesoporous TiO2. Abstract: Cd doped mesoporous titanium oxide was prepared using non-ionic...

108

Synthesis of Room-Temperature Ferromagnetic Cr-doped TiO(110...  

NLE Websites -- All DOE Office Websites (Extended Search)

Ferromagnetic Cr-doped TiO(110) Rutile Single Crystals using Ion Implantation. Synthesis of Room-Temperature Ferromagnetic Cr-doped TiO(110) Rutile Single Crystals using Ion...

109

Self-assembled TiO2-Graphene Hybrid Nanostructures for Enhanced...  

NLE Websites -- All DOE Office Websites (Extended Search)

TiO2-Graphene Hybrid Nanostructures for Enhanced Li-ion Insertion . Self-assembled TiO2-Graphene Hybrid Nanostructures for Enhanced Li-ion Insertion . Abstract: We used anionic...

110

Thermal stability and oxidation resistance of TiCrAlYO coatings...  

NLE Websites -- All DOE Office Websites (Extended Search)

stability and oxidation resistance of TiCrAlYO coatings on SS430 for solid oxide fuel cell interconnect applications. Thermal stability and oxidation resistance of TiCrAlYO...

111

NICKEL-FREE Fe-12Mn-0.2Ti ALLOY STEEL FOR CRYOGENIC APPLICATIONS  

E-Print Network (OSTI)

O. 2Ti ALLOY STEEL FOR CRYOGENIC APPLICATIONS S'. Hwang, S.0.2Ti ALLOY STEEL FOR CRYOGENIC APPLICATIONS by S. Hwang, S.was investigated for cryogenic applications. The systematic

Hwang, S.

2010-01-01T23:59:59.000Z

112

Formaldehyde Polymerization on (WO3)3/TiO2(110) Model Catalyst...  

NLE Websites -- All DOE Office Websites (Extended Search)

Formaldehyde Polymerization on (WO3)3TiO2(110) Model Catalyst. Formaldehyde Polymerization on (WO3)3TiO2(110) Model Catalyst. Abstract: Polymerization of formaldehyde, H2CO, was...

113

Irradiation behavior of SrTiO3 at temperatures close to the critical...  

NLE Websites -- All DOE Office Websites (Extended Search)

for amorphization. Abstract: Damage accumulation on both the Sr and Ti sublattices in strontium titanate (SrTiO3) has been investigated under 1.0 MeV Au+ irradiation at 360 and 400...

114

Structure, magnetic properties and magnetoelastic anisotropy in epitaxial Sr(Ti???Co?)O? films  

E-Print Network (OSTI)

We report the structure, magnetic properties and magnetoelastic anisotropy of epitaxial Sr(Ti???Co?)O? films grown on LaAlO? (001) and SrTiO? (001) substrates by pulsed laser deposition. Room temperature ferromagnetism was ...

Bi, Lei

115

Imaging Adsorbate O-H Bond Cleavage: Methanol on TiO2(110). ...  

NLE Websites -- All DOE Office Websites (Extended Search)

Adsorbate O-H Bond Cleavage: Methanol on TiO2(110). Imaging Adsorbate O-H Bond Cleavage: Methanol on TiO2(110). Abstract: We investigated methanol adsorption and dissociation on...

116

BaTiO? based materials for piezoelectric and electro-optic applications  

E-Print Network (OSTI)

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 ...

Avrahami, Ytshak, 1969-

2003-01-01T23:59:59.000Z

117

Co-doped Anatase TiO Heteroepitaxy on Si(001). | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

layer, followed by deposition of a thin SrTiO&8323; buffer layer. Using ½ ML Sr metal to form the silicide allowed the deposition of 10 ML SrTiO&8323; without oxidation...

118

Phase constitution, Mechanical Property and Corrosion Resistance of the Ti-Nb Alloys  

E-Print Network (OSTI)

the Ti-Ni alloy in the dental application. In the non-oral condition, the Ti-52Nb alloy may be preferable, dentistry and interventional radiology because of their superior shape memory effect and superelasticity [1

Zheng, Yufeng

119

E-Print Network 3.0 - ar ti cr Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Cu films were deposited on a steel substrate with thickness range of 200 - 2000... of TiC14, N2, HZ and Ar a t 520'C. The adhesion strength of TiN films was investigated by...

120

Scanning tunneling microscopy investigation of the TiO2 anatase ,,101... surface Wilhelm Hebenstreit,1  

E-Print Network (OSTI)

of tunneling sites in STM. Titanium dioxide (TiO2) is a versatile material that finds uses as a promoter. Fourfold-coordinated Ti atoms at step edges are preferred adsorption sites and allow the identification

Diebold, Ulrike

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Design, optimization, and applications of few-cycle Ti:Sapphire lasers  

E-Print Network (OSTI)

Ti:Sapphire mode-locked lasers are a unique technology that enables a wide variety of applications. Owing to the ultrabroadband nature of the Ti:sapphire crystal and the invention of precisely engineered dispersion-compensating ...

880-01 Chen, Li jin

2012-01-01T23:59:59.000Z

122

Thermodynamics of the Magnetite-Ulvöspinel (Fe3O4-Fe2TiO4...  

NLE Websites -- All DOE Office Websites (Extended Search)

the Magnetite-Ulvöspinel (Fe3O4-Fe2TiO4) Solid Solution. Thermodynamics of the Magnetite-Ulvöspinel (Fe3O4-Fe2TiO4) Solid Solution. Abstract: The thermodynamics of mixing...

123

TiO2 Nanoparticles as a Soft X-ray Molecular Probe  

E-Print Network (OSTI)

Figure 1. TEM image of PAA coated TiO 2 nanoparticles .TOPO with polyacrylic acid (PAA) . Preparation of TiO 2 -TOPO with polyacrylic acid (PAA) 2 . A solution of 0.1 g PAA

Ashcroft, Jared M.

2008-01-01T23:59:59.000Z

124

Growth of Cr-doped TiO Films in the Rutile and Anatase Structures...  

NLE Websites -- All DOE Office Websites (Extended Search)

of Cr-doped TiO Films in the Rutile and Anatase Structures by Oxygen Plasma Assisted Molecular Beam Epitaxy . Growth of Cr-doped TiO Films in the Rutile and Anatase Structures by...

125

Chemical Reactivity of Reduced TiO2(110): The dominant role of...  

NLE Websites -- All DOE Office Websites (Extended Search)

Reactivity of Reduced TiO2(110): The dominant role of surface defects in oxygen chemisorption. Chemical Reactivity of Reduced TiO2(110): The dominant role of surface defects in...

126

Acetone Chemistry on Oxidized and Reduced TiO2(110). | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Acetone Chemistry on Oxidized and Reduced TiO2(110). Acetone Chemistry on Oxidized and Reduced TiO2(110). Abstract: The chemistry of acetone on the oxidized and reduced surfaces of...

127

Methylene Bromide Chemistry and Photochemistry on Rutile TiO2...  

NLE Websites -- All DOE Office Websites (Extended Search)

Methylene Bromide Chemistry and Photochemistry on Rutile TiO2(110). Methylene Bromide Chemistry and Photochemistry on Rutile TiO2(110). Abstract: The chemistry and photochemistry...

128

Alcohol Chemistry on Rutile TiO2(110): The Influence of Alkyl...  

NLE Websites -- All DOE Office Websites (Extended Search)

Alcohol Chemistry on Rutile TiO2(110): The Influence of Alkyl Substituents on Reactivity and Selectivity. Alcohol Chemistry on Rutile TiO2(110): The Influence of Alkyl Substituents...

129

Surface Chemistry of 2-Propanol on TiO2(110): Low and High Temperature...  

NLE Websites -- All DOE Office Websites (Extended Search)

Chemistry of 2-Propanol on TiO2(110): Low and High Temperature Dehydration, Isotope Effects, and Influence of Local Surface Chemistry of 2-Propanol on TiO2(110): Low and High...

130

Role of polaron hopping in leakage current behavior of a SrTiO3 ...  

E-Print Network (OSTI)

Dec 10, 2013 ... zirconate titanite (PZT), strontium titanite (SrTiO3), and bar- ium titanite (BaTiO3), have been widely utilized in various electronic devices such ...

2014-03-14T23:59:59.000Z

131

Electrochemical modification of the passive oxide layer on a Ti film observed by in situ neutron reflectometry  

SciTech Connect

Anodization and the effect of subsequently applying cathodic potential to a thin-film Ti electrode in an aqueous NaCl solution have been studied with in situ neutron reflectometry. This new technique provides further insight into the processes underlying anodic oxide formation and hydrogen absorption under cathodic polarization. The results (Pilling-Bedworth ratio, anodization ratio, the onset of fluctuations in electrode current under cathodic potential, etc.) are generally in agreement with the literature, but this new technique provides further insight into the electrochemical processes. The anodized oxide is observed to be not porous, and has the density of the rutile structure for its entire thickness. However, it comprises two distinct regions: an inner region similar in thickness and composition to the original air-grown oxide, and an outer region containing a significant amount of hydrogen. The similarity of the inner region to the original oxide suggests that the underlying oxide growth mechanism for Ti is the point-defect model. Under applied cathodic potentials the overall oxide thickness remains constant, but the inner region is gradually converted to a material similar in hydrogen content to the outer region. The onset of massive hydrogen penetration seems to occur when the conversion is complete, or when the inner region has been reduced to only a few atomic layers.

Tun, Z. [National Research Council, Chalk River, Ontario (Canada). Chalk River Labs.] [National Research Council, Chalk River, Ontario (Canada). Chalk River Labs.; Noeel, J.J.; Shoesmith, D.W. [Atomic Energy of Canada Limited, Pinawa, Manitoba (Canada). Whiteshell Labs.] [Atomic Energy of Canada Limited, Pinawa, Manitoba (Canada). Whiteshell Labs.

1999-03-01T23:59:59.000Z

132

Compton Profile Study of Intermetallic Ti{sub 3}Al  

SciTech Connect

The Compton scattering measurement on intermetallic alloy Ti{sub 3}Al is reported in this work. The measurement is made using 59.54 keV gamma-rays from Am{sup 241} source. Theoretical calculation of Compton profile is also performed employing CRYSTAL code within the framework of density functional theory to compare with the measurement. The theoretical profile of the alloy is also synthesized following the superposition model taking the published Compton profiles of elemental solids from the APW method. The experimental study of charge transfer in the alloys has also been done by performing the experimental Compton profile measurements on Ti and Al following the superposition model and charge transfer from Al to Ti is clearly seen on the alloy formation.

Vyas, V.; Sharma, G. [Department of Physics, Banasthali University, Banasthali-304022 (India); Mishra, M. C.; Sharma, B. K. [Department of Physics, University of Rajasthan, Jaipur-302004 (India); Joshi, K. B. [Department of Physics, University College of Science, M.L.Sukhadia University, Udaipur-313 002 (India)

2011-10-20T23:59:59.000Z

133

Corrosion behavior of newly developed TiAgFe dental alloys in neutral saline solution  

E-Print Network (OSTI)

Corrosion behavior of newly developed Ti­Ag­Fe dental alloys in neutral saline solution B. B. Zhang, B. L. Wang, L. Li and Y. F. Zheng* The corrosion behavior of Ti­5Ag­xFe alloys (x ¼ 1, 2.5, 5 wt) Ti,Ti­ 5Ag­xFe alloys exhibited higher corrosion potentials, lower current densities, and larger

Zheng, Yufeng

134

Optical and electrical characterization of the electron beam gun evaporated TiO2 lm  

E-Print Network (OSTI)

Optical and electrical characterization of the electron beam gun evaporated TiO2 ®lm V of TiO2 ®lms obtained by electron beam gun evaporation and annealed in an oxygen environment. A negative with TiO2 insulator ®lms deposited by electron beam gun evaporator. P-type Si wafers (1 0 0 orientation

Eisenstein, Gadi

135

Structure and Dynamics of CO2 on Rutile TiO2(110)-1×1....  

NLE Websites -- All DOE Office Websites (Extended Search)

CO2 on Rutile TiO2(110)-1×1. Structure and Dynamics of CO2 on Rutile TiO2(110)-1×1. Abstract: Adsorption, binding, and diffusion of CO2 molecules on rutile TiO2(110)...

136

Site-Dependent Activity of Atomic Ti Catalysts in Al-Based Hydrogen Storage Materials  

E-Print Network (OSTI)

Site-Dependent Activity of Atomic Ti Catalysts in Al-Based Hydrogen Storage Materials Abdullah Al storage processes. Here we analyze the role of atomic Ti catalysts in the hydrogenation of Al-based hydrogen storage materials. We show that Ti atoms near the Al surface activate gas-phase H2, a key step

Ciobanu, Cristian

137

A UV light enhanced TiO2/graphene device for oxygen sensing at room temperature  

E-Print Network (OSTI)

A UV light enhanced TiO2/graphene device for oxygen sensing at room temperature Jia Zhang,ab Chao temperature oxygen sensor based on TiO2/graphene device was developed with an enhanced sensing performance­hole pairs in the TiO2 film and the photogenerated electrons were scavenged by graphene and percolated

Cao, Wenwu

138

Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles  

Science Journals Connector (OSTI)

Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles ... Comment on “Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles” ... Comment on “Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles” ...

Toshiyuki Abe; Eiji Suzuki; Kentaro Nagoshi; Kohichi Miyashita; Masao Kaneko:

2000-03-24T23:59:59.000Z

139

Textures and plastic anisotropy in gamma-TiAl  

SciTech Connect

Specimens of a Ti-36 wt pct Al alloy consisting primarily of gamma TiAl were deformed in compression at 450 C and in rolling at 1050 C. The textures of the deformed specimens were measured and analyzed in terms of orientation distribution functions. After hot rolling, the texture is strongly influenced by recrystallization and shows a cube-like component with an alignment of the c-axis with the transverse direction. The measured compression textures are compared with those simulated on the basis of the Taylor theory of polycrystal deformation. 36 refs.

Hartig, C.H.; Fang, X.F.; Mecking, H.; Dahms, M. (Hamburg, Technische Universitaet, (Germany) GKSS-Forschungszentrum Geesthacht GmbH, (Germany))

1992-08-01T23:59:59.000Z

140

Preparation, characterization and applications of novel carbon and nitrogen codoped TiO{sub 2} nanoparticles from annealing TiN under CO atmosphere  

SciTech Connect

Graphical abstract: Carbon and nitrogen codoped TiO{sub 2} nanoparticles were firstly fabricated by calcining TiN powder under CO atmosphere at different temperatures between 400 and 600 °C, both the improved photocatalytic activity for degradation of methylene blue and enhanced photovoltaic performance for dye sensitized solar cells were demonstrated. - Highlights: • CN-codoped TiO{sub 2} nanoparticles were prepared by calcining TiN under CO atmosphere. • More visible light response was confirmed by UV–vis DRS and photocatalytic results. • Enhanced conversion efficiency was observed for the DSSCs from CN-TiO{sub 2} photoanode. • CN-codoping played an important role to improve the photocatalytic performance. - Abstract: Carbon and nitrogen codoped titania (CN-TiO{sub 2}) nanoparticles were fabricated by calcining titanium nitride (TiN) nanoparticles under carbon monoxide (CO) atmosphere at four different temperatures in a range of 400–600 °C. The as-prepared samples were characterized with X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS). Enhanced light absorption in both the UV and visible light region was observed for the resulted CN-TiO{sub 2} nanoparticles in ultraviolet-visible diffuse reflectance spectroscopy (UV–vis DRS). Improved photocatalytic activity toward the degradation of methylene blue by the CN-TiO{sub 2} nanoparticles was demonstrated under UV and visible light, respectively. The highest degradation rate was achieved for CN-TiO{sub 2} nanoparticles (13%) compared to N-TiO{sub 2} (10%) and the commercial P25 (5%) under visible light illumination for 40 min. Furthermore, the improved photocatalytic activity of CN-TiO{sub 2} was also confirmed by the degradation of colorless resorcinol under UV–vis light irradiation. Dye-sensitized solar cells (DSSCs) were fabricated using P25, N-TiO{sub 2} and CN-TiO{sub 2} photoanodes, respectively. The highest conversion efficiency of 3.31% was achieved by the DSSCs based on the CN-TiO{sub 2} photoanodes in comparison with the commercial P25 (1.61%) and N-TiO{sub 2} (2.44%) photoanodes. This work demonstrates that thermal treatment of TiN nanoparticles under CO atmosphere has shown to be a rapid, direct and clean approach to synthesize photocatalysts with enhanced photocatalytic and photovoltaic performance.

Sun, Mingxuan; Song, Peng; Li, Jing; Cui, Xiaoli, E-mail: xiaolicui@fudan.edu.cn

2013-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

A novel hierarchical homogeneous nanoarchitecture of TiO2 nanosheets branched TiO2 nanosheet arrays for high efficiency dye-sensitized solar cells  

Science Journals Connector (OSTI)

Abstract We report a novel hierarchical homogeneous nanoarchitecture of TiO2 nanosheets branched TiO2 nanosheet arrays, which is formed directly on transparent conductive fluorine-doped tin oxide (FTO) glass substrate through a one-step facile hydrothermal reaction without the use of a seed layer. The hierarchical homogeneous nanoarchitecture is composed of long TiO2 nanosheet trunks grafted with a large number of TiO2 nanosheet branches, which is an effective structure to improve the charge transport with the increase of the specific surface area. Dye-sensitized solar cell (DSSC) based on TiO2 nanosheets branched TiO2 nanosheet arrays can achieve an outstanding power conversion efficiency of 6.66%, which is attributed to the specific performances such as higher specific surface area for adsorbing more dye molecules, superior light scattering capacity for boosting the light-harvesting efficiency and faster charge transport for efficient charge collection.

Bing-Xin Lei; Xiao-Feng Zheng; He-kang Qiao; Yi Li; Shu-Nuo Wang; Guo-Lei Huang; Zhen-Fan Sun

2014-01-01T23:59:59.000Z

142

Topotaxial growth of Ti{sub 2}AlN by solid state reaction in AlN/Ti(0001) multilayer thin films  

SciTech Connect

The formation of Ti{sub 2}AlN by solid state reaction between layers of wurtzite-AlN and {alpha}-Ti was characterized by in situ x-ray scattering. The sequential deposition of these layers by dual magnetron sputtering onto Al{sub 2}O{sub 3}(0001) at 200 deg. C yielded smooth, heteroepitaxial (0001) oriented films, with abrupt AlN/Ti interfaces as shown by x-ray reflectivity and Rutherford backscattering spectroscopy. Annealing at 400 deg. C led to AlN decomposition and diffusion of released Al and N into the Ti layers, with formation of Ti{sub 3}AlN. Further annealing at 500 deg. C resulted in a phase transformation into Ti{sub 2}AlN(0001) after only 5 min.

Hoeglund, C.; Beckers, M.; Schell, N.; Borany, J. v.; Birch, J.; Hultman, L. [Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linkoeping University, S-581 83 Linkoeping (Sweden); GKSS Research Center Geesthacht, Max-Planck-Str. 1, D-21502 Geesthacht (Germany); Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, P.O. Box 510119, D-01314 Dresden (Germany); Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linkoeping University, S-581 83 Linkoeping (Sweden)

2007-04-23T23:59:59.000Z

143

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

SciTech Connect

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.

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

2014-02-10T23:59:59.000Z

144

cONNEcTiONS SPriNG 2015  

E-Print Network (OSTI)

curricular cONNEcTiONS GuiDE SPriNG 2015 Aquila Theatre Wuthering Heights Photo Credit: Richard Termine (top) Susan Brandeis Design Class at the Gregg Museum Photo Credit: Matthew Gay (bottom) #12G) is a great way to integrate the arts into academic work, to foster a well-rounded education where art

Velev, Orlin D.

145

Ni-Pt Silicide Formation Through Ti Mediating Layers  

SciTech Connect

With Ni1-xPtxSi, the variation in queue time between the final surface cleaning and Ni-Pt deposition represents a significant manufacturability issue. A short queue time is often difficult to maintain, leading to the formation of an oxide layer on the Si substrate prior to Ni-Pt deposition that can affect the formation of Ni1-xPtxSi and its texture. In this manuscript, it will be shown that an extended queue time prior to Ni-Pt deposition leads to morphological changes in the Ni1-xPtxSi formation sequence. A layer of Ti deposited between Ni-Pt and Si reduces the native oxide and may facilitate Ni1-xPtxSi formation. With increasing Ti thickness, the presence of metal-rich phases is gradually reduced and the formation temperature of Ni1-xPtxSi increases, suggesting a direct formation of Ni1-xPtxSi from Ni-Pt. In the presence of an interfacial oxide, an increase in formation temperature is also observed with increasing Ti interlayer thickness. When the Ti layer is sufficiently thick, the phase formation sequence becomes relatively insensitive to the presence of an interfacial oxide or extended queue time.

Besser,P.; Lavoie, C.; Ozcan, A.; Murray, C.; Strane, J.; Wong, K.; Gribelyuk, M.; Wang, Y.; Parks, C.; Jordan-Sweet, J.

2007-01-01T23:59:59.000Z

146

A Study of Oxygen Vacancy Formation and Annihilation in Submonolayer Coverages of TiO2 Dispersed on MCM-48  

E-Print Network (OSTI)

A Study of Oxygen Vacancy Formation and Annihilation in Submonolayer Coverages of TiO2 Dispersed.932), suggesting the formation of oxygen vacancies. The fraction of Ti that could be reduced increased with TiO2 the TiO2 overlayer as the size of the titania patches increases. The amount of oxygen removed during

Bell, Alexis

147

Probing photochemical transformations at TiO{sub 2}/Pt and TiO{sub 2}/Ir interfaces using x-ray absorption spectroscopy  

SciTech Connect

Structural transformations at the TiO{sub 2}/Pt and TiO{sub 2}/Ir interfaces during UV-irradiation have been probed by X-ray absorption spectroscopy. Oxidation by the photogenerated holes results in the intercalation of Pt and Ir into the Titania matrix. The structural transformations observed with Pt and Ir nanoparticles anchored on TiO{sub 2} is different than the clustering of gold atoms observed in the TiO{sub 2}/Au system. Implications of such structural transformations on the photocatalytic activity of semiconductor photocatalyts are discussed.

Lahiri, Debdutta; Subramanian, V.; Bunker, Bruce A.; Kamat, Prashant V. [Synchrotron Radiation Section, Physics Group, Bhabha Atomic Research Centre, Mumbai 400085 (India); Department of Chemical Engineering, University of Illinois at Urbana-Champaign, Illinois 61801 (United States); Department of Physics, University of Notre Dame, Indiana 46556 (United States); Radiation Laboratory, University of Notre Dame, Indiana 46556 (United States)

2006-05-28T23:59:59.000Z

148

Intrinsic metastability of orthorhombic HfTiO{sub 4} in thin film hafnia-titania  

SciTech Connect

Orthorhombic (o) HfTiO{sub 4} is crystallized when sputter deposited hafnia-titania nanolaminates with ultrathin layers and bilayer (HfO{sub 2}){sub 0.5}(TiO{sub 2}){sub 0.5} composition are annealed between 573 and 1173 K. However, o-HfTiO{sub 4} demixes after annealing at 1273 K, a result not predicted from bulk thermodynamics. X-ray diffraction and Raman microscopy are used here to study structural changes as o-HfTiO{sub 4} demixes upon long-term annealing at 1273 K into Ti-doped monoclinic HfO{sub 2} and Hf-doped rutile TiO{sub 2}. We conclude that o-HfTiO{sub 4} crystallized at low temperature is intrinsically metastable. A space group symmetry analysis shows that demixing can be accomplished by a continuous phase transition chain.

Cisneros-Morales, Massiel Cristina; Aita, Carolyn Rubin [Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201 (United States)

2011-01-31T23:59:59.000Z

149

Interaction of TiO{sub 2}{sup ?} with water: Photoelectron spectroscopy and density functional calculations  

SciTech Connect

The interactions of titania with water molecules were studied via photoelectron spectroscopy and density functional calculations of TiO(OH){sub 2}{sup ?} and Ti(OH){sub 4}(H{sub 2}O){sub n}{sup ?} (n = 0–5) clusters which are corresponding to the TiO{sub 2}(H{sub 2}O){sup ?} and TiO{sub 2}(H{sub 2}O){sub n+2}{sup ?} (n = 0–5) systems, respectively. Experimental observation and theoretical calculations confirmed that TiO(OH){sub 2}{sup ?} was produced when TiO{sub 2}{sup ?} interacts with one water molecule, and Ti(OH){sub 4}(H{sub 2}O){sub n}{sup ?} (n = 0–5) were produced successively when TiO{sub 2}{sup ?} interacts with two or more water molecules. The structures of Ti(OH){sub 4}(H{sub 2}O){sub n}{sup ?} with n = 4, 5 are slightly different from those of n = 1–3. The structures of Ti(OH){sub 4}(H{sub 2}O){sub 1-3}{sup ?} can be viewed as the water molecules interacting with the Ti(OH){sub 4}{sup ?} core through hydrogen bonds; however, in Ti(OH){sub 4}(H{sub 2}O){sub 4,5}{sup ?}, one of the water molecules interacts directly with the Ti atom via its oxygen atom instead of a hydrogen bond and distorted the Ti(OH){sub 4}{sup ?} core.

Li, Ren-Zhong [College of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048 (China) [College of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048 (China); Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China); Xu, Hong-Guang; Cao, Guo-Jin; Xu, Xi-Ling; Zheng, Wei-Jun, E-mail: zhengwj@iccas.ac.cn [Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)] [Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)

2013-11-14T23:59:59.000Z

150

Photocatalytic effects of wool fibers modified with solely TiO2 nanoparticles and N-doped TiO2 nanoparticles by using hydrothermal method  

Science Journals Connector (OSTI)

Abstract The surfaces of wool fibers are modified with N-doped TiO2 nanoparticles by treating the fibers with tetrabutyl titanate and ammonium chloride under low temperature hydrothermal conditions to obtain wool fibers with photocatalytic functions in the visible light spectrum. The effects of nitrogen and sulfur in amino acids in keratin on the photocatalytic activity of TiO2 particle coated wool fibers are investigated. Changes of various fiber properties such as tensile strength, photocatalytic activity, and self-cleaning performance of untreated, TiO2 coated and N-doped TiO2 coated wool fibers are studied. It is found that N-doped anatase TiO2 nanoparticles with an average grain size of 11.2 nm are synthesized and simultaneously grafted onto the wool fibers. After treatments, the crystallization index of the wool fibers is slightly reduced. The capability to protect against ultraviolet radiation is much enhanced. The performances of photocatalytic degradation of methylene blue dye and self-cleaning of red wine under both UV and visible light irradiation are endowed. It is also found that wool fibers coated with TiO2 particles without being doped by nitrogen still have apparent photocatalytic reactions and self-cleaning effects under visible light irradiation due to the formation of C-Ti3+, O-Ti3+, and N-Ti3+ bonds between TiO2 and wool keratin on the wool fiber surfaces. Thus wool fabrics might not need to be coated with N-doped TiO2 nanoparticles to realize its self-cleaning effect under visible light. Such important conclusions would provide wool materials with wide applications in clothing and technical products such as wastewater treatment.

Hui Zhang; Zhenwei Yang; Xingtao Zhang; Ningtao Mao

2014-01-01T23:59:59.000Z

151

Au/PO43-/TiO2 and PO43-/Au/TiO2 catalysts for CO oxidation: effect of synthesis details on catalytic performance  

SciTech Connect

Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO{sub 2} synthesized via two routes. In route I, Au/PO{sub 4}{sup 3-}/TiO{sub 2} catalysts were prepared by treating TiO{sub 2} (Degussa P25) with diluted H{sub 3}PO{sub 4}, followed by loading gold via deposition-precipitation. In route II, PO{sub 4}{sup 3-}/Au/TiO{sub 2} catalysts were prepared by treating H{sub 2}-reduced Au/TiO{sub 2} with diluted H{sub 3}PO{sub 4}. These catalysts were systematically pretreated at 200 or 500 C before reaction testing. The overall CO conversion on 200 C-pretreated Au/PO43-/TiO2 or PO43-/Au/TiO2 was always lower than that on 200 C-pretreated Au/TiO2. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO43-/TiO2 and PO43-/Au/TiO2 pretreated at 500 C retained significant activities at room temperature, whereas 500 C-pretreated Au/TiO2 lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.

Ma, Zhen [ORNL; Overbury, Steven {Steve} H [ORNL; Dai, Sheng [ORNL

2007-01-01T23:59:59.000Z

152

Application Of Ti-Based Self-Formation Barrier Layers To Cu Dual-Damascene Interconnects  

SciTech Connect

Cu interconnects have been used extensively in ULSI devices. However, large resistance-capacitance delay and poor device reliability have been critical issues as the device feature size has reduced to nanometer scale. In order to achieve low resistance and high reliability of Cu interconnects, we have applied a thin Ti-based self-formed barrier (SFB) using Cu(Ti) alloy seed to 45nm-node dual damascene interconnects and evaluated its performance. The line resistance and via resistance decreased significantly, compared with those of conventional Ta/TaN barriers. The stress migration performance was also drastically improved using the SFB process. A performance of time dependent dielectric breakdown revealed superior endurance. These results suggest that the Ti-based SFB process is one of the most promising candidates for advanced Cu interconnects. TEM and X-ray photoelectron spectroscopy observations for characterization of the Ti-based SFB structure were also performed. The Ti-based SFB consisted of mainly amorphous Ti oxides. Amorphous or crystalline Ti compounds such as TiC, TiN, and TiSi formed beneath Cu alloy films, and the formation varied with dielectric.

Ito, Kazuhiro; Kohama, Kazuyuki [Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501 (Japan); Ohmori, Kazuyuki; Mori, Kenichi; Maekawa, Kazuyoshi; Asai, Koyu [Process Technology Div., Renesas Electronics Corporation, Hitachinaka, Ibaraki 312-8504 (Japan); Murakami, Masanori [The Ritsumeikan Trust, Nakagyo-ku, Kyoto 604-8520 (Japan)

2010-11-24T23:59:59.000Z

153

Na double-edge magneto-optic filter for Na lidar profiling of wind and temperature in the  

E-Print Network (OSTI)

proposed by one of the authors (Williams), originating from the Na magneto-optic filter in solar-edge magneto-optic fil- ter (Na-DEMOF). It has advantages over the FPIs and iodine filters because of its magnetic field across the Na cell causes the Zeeman splitting of Na energy levels, which shifts

Chu, Xinzhao

154

Preparation of K2Ti6O13/TiO2 bio-ceramic on titanium substrate by micro-arc oxidation  

Science Journals Connector (OSTI)

K2Ti6O13/TiO2 bio-ceramic coatings are prepared successfully by micro-arc oxidation on titanium substrate in pure KOH electrolyte...2) and in KOH electrolyte with different concentrations (0.5–1.2 mol/L). The com...

Zhongwei Zhao; Xingyu Chen; Ailiang Chen; Guangsheng Huo…

2009-12-01T23:59:59.000Z

155

low Si p+-n junctions fabricated by focused ion beam Ga+ implantation through thin Ti and TiSi2 layers  

E-Print Network (OSTI)

metals and silicide layers, in conjunction with rapid thermal annealing (RTA) to complete metal silicides and it forms uniform thin films on Si. Most of the current research involving salicide+ implantation through Ti metal (ITM) and TiSi, (ITS) layers, followed by rapid thermal annealing (RTA), has been

Steckl, Andrew J.

156

Shape and strain-induced magnetization reorientation and magnetic anisotropy in thin film Ti/CoCrPt/Ti lines and rings  

E-Print Network (OSTI)

The contributions to the magnetic anisotropy of thin-film rings and lines of width 50 nm and above made from Ti(5?nm)/Co[subscript 0.66]Cr[subscript 0.22]Pt[subscript 0.12] (10 and 20 nm)/Ti (3 nm) with a perpendicular ...

Velazquez, D.

157

Investigation on the delaminated-pillared structure of TiO2-PILC synthesized by TiCl4 hydrolysis method  

Science Journals Connector (OSTI)

TiO2-PILCs were synthesized by the reaction between montmorillonite and acidic solutions of hydrolyzed TiCl4. Unlike commonly reported microporous pillared structure, a meso–microporous delaminated structure containing pillared fragments was observed in the resulting TiO2-PILC, based on the combined analyses of powder X-ray diffraction (XRD), nitrogen adsorption–desorption isotherms, chemical analysis, thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses. Air-drying after ethanol extraction (EAD) is shown to be more effective than air-drying (AD) in preserving the delaminated structure in the resultant Ti-clay. A broad XRD peak at low 2? angle with a high d-spacing of ?6.6 nm was firstly reported and it was proposed to be correlated with the mesoporous delaminated structure rather than the (0 0 1) reflection of intercalated/pillared periodic structure. The resulting TiO2-PILC exhibits a good thermal stability as indicated by its surface area after calcination at 600 °C. Moreover, calcination above 300 °C results in the formation of nanocrystalline anatase in the TiO2-PILC, and the grain size of anatase increases with the increment of calcination temperature. However, no phase transformation from anatase to rutile was observed even under calcination at 1000 °C. These fundamental results provide new insights about the structure of TiO2-PILC synthesized by TiCl4 hydrolysis method.

Peng Yuan; Xiaoling Yin; Hongping He; Dan Yang; Linjiang Wang; Jianxi Zhu

2006-01-01T23:59:59.000Z

158

Wettability of Ti3SiC2 by Ag-Cu and Ag-Cu-Ti O. Dezellus,a*  

E-Print Network (OSTI)

ternary ceramics Mn+1AXn (where M corresponds to an early transition metal, A is an A-group element, and X of metals and ceramic properties [1]. Among these compounds, titanium silicon carbide (Ti3SiC2) has gained, the ternary carbide Ti3SiC2 has gained much attention due to its unique characteristics combining

Boyer, Edmond

159

Preparation of Highly Transparent TiO2-based Thin Film Photocatalysts by an Ion Engineering Method: Ionized Cluster Beam Deposition  

Science Journals Connector (OSTI)

Highly transparent TiO2 and TiO2-based binary oxide (TiO2/SiO2 and TiO2/B2O3) thin films of different TiO2 contents were successfully prepared by using an ion engineering technique as a dry process. These transpa...

Masato Takeuchi; Masakazu Anpo

2010-01-01T23:59:59.000Z

160

Interlaboratory Comparisons of NbTi Critical Current Measurements  

SciTech Connect

We report on a multi-institute comparison of critical current data measured on a modern NbTi wire for the Large Hadron Collider (LHC), which has shown a standard deviation below 1% in critical current density spread in more than 1500 measurements. Interlaboratory comparisons on Nb{sub 3}Sn wires have shown ambiguities that could be attributable to strain related differences in critical current density, originating from differences in sample handling, reaction, and mounting techniques, or also to differences in the magnetic field and current calibrations between the institutes. A round robin test of a well characterized NbTi wire provides a baseline variance in critical current results that is presumed to be attributable only to differences in the characterization systems. Systematic differences on the order of 3.5% are found in the comparison. The most likely cause for the observed differences is a small diameter holder that brings the wire into a strain regime in which strain effects can no longer be ignored. A NbTi round robin test, when performed properly, will separate system differences from sample specific differences and provide laboratories with an opportunity to calibrate equipment against a standard measurement.

Godeke, A.; Turrioni, D.; Boutboul, T.; Cheggour, N.; Goodrich, L.F.; Ghosh, A.; Den Ouden, A.; Meinesz, M.

2009-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Second Sound in NaF  

Science Journals Connector (OSTI)

Propagation of heat pulses in NaF has been studied to higher temperatures in a purer crystal than studied by McNelly et al. At the highest temperatures the second-sound velocity fails to level off at the theoretically predicted limiting value.

Howard E. Jackson; Charles T. Walker; Thomas F. McNelly

1970-07-06T23:59:59.000Z

162

master's degree NaNotechNology  

E-Print Network (OSTI)

master's degree NaNotechNology When choosing a Master's programme, it is wise to look one step topical, incorporating the latest developments in applied physics, nanotechnology, chemical engineering projects will be carried out at the MESA+ institute for nanotechnology, or the MIRA institute

Twente, Universiteit

163

DIFFUSION OF Na AND Cs IN MONTMORILLONITE  

Science Journals Connector (OSTI)

...Na-montmorillonite, is used to backfill emplacement tunnels (Nagra...the low permeability of the backfill material inhibits the advective...are retained in the bentonite buffer long enough to let radioactive...minerals. Pp. 19-68 in: Handbook of Clay Science (F. Bergaya...

Georg Kosakowski; Sergey V. Churakov; Tres Thoenen

164

Ann bay lodyans 7 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network (OSTI)

pou I pase akote. Ti djab la bare I: "Kwa kwa kwa! Ala chans m genyen jodi a. Mwen chita chita m, epi yon vyann vin jwenn mwen. Ki kote ou prale, ti neg?" Dyedone komanse tranble. Men li C^*M pran kouraj li ak 2 men, li pran chante pou ti djab... m pito pa vann." 2 Wa a karese Malis, li pwomet li tout pwoteksyon. Alafen, li louvri men Malis, li depoze san dola ladann. Le msye we bel fey lajan, li dako pou ba Wa a ti lanp la. Epi, nan denmen, Malis al achte yon vye bourik ak kob la...

Freeman, Bryant C., ed.

2000-01-01T23:59:59.000Z

165

Photoelectrochemical Water Splitting of Nitrogen and Hydrogen Treated P25 TiO2 Films  

E-Print Network (OSTI)

CdS and CdSe have been successfully employed in the sensitization of TiO 2 . Although sensitization and doping

Zavodivker, Liat Shari

2014-01-01T23:59:59.000Z

166

Oxygen-Isotope Exchange between CO2 and Solid Ti18O2  

Science Journals Connector (OSTI)

Oxygen-Isotope Exchange between CO2 and Solid Ti18O2 ... Analysis of the isotopic composition of the gases produced has revealed ... ...

Svatopluk Civis?; Martin Ferus; Pavel Kuba?t; Marke?ta Zukalova?; Ladislav Kavan

2011-05-17T23:59:59.000Z

167

Phase separation and charge localization in UHV-lithiated anatase TiO{sub 2} nanoparticles  

SciTech Connect

The insertion of lithium in anatase TiO{sub 2} nanoparticles under ultrahigh vacuum (UHV) conditions is studied using x-ray absorption spectroscopy (XAS) and resonant photoelectron spectroscopy (RPES) at the Ti L{sub 2,3} edge. It is demonstrated that XAS can be used to monitor the separation into an anatase phase and a lithium titanate phase of formal stoichiometry Li{sub 0.5}TiO{sub 2}. The initial state properties of the Ti 3d states of the lithium titanate phase are investigated using ab initio electronic structure calculations. The calculations show a correlation driven separation of Ti 3d states from the conduction band in agreement with previous studies. It is shown that Ti in different oxidation states (Ti{sup 3+} and Ti{sup 4+}) is formed as a direct consequence of the electron-electron interaction. RPES and XAS spectra confirm the presence of electronically inequivalent Ti sites. The site-sensitivity of the RPES spectra at selected electron binding energies is found to be consistent with the calculations.

Richter, J.H.; Henningsson, A.; Sanyal, B.; Karlsson, P.G.; Siegbahn, H.; Eriksson, O.; Sandell, A. [Department of Physics, Uppsala University, P.O. Box 530, S-751 21 Uppsala (Sweden); Andersson, M. P.; Uvdal, P. [Chemical Physics, Department of Chemistry, Lund University, P.O. Box 124, S-221 00 Lund (Sweden)

2005-06-15T23:59:59.000Z

168

Adsorption and Oxidation of Elemental Mercury over Ce-MnOx/Ti-PILCs  

Science Journals Connector (OSTI)

A series of innovative Ce–Mn/Ti-pillared-clay (Ce–Mn/Ti-PILC) catalysts combining the advantages of PILCs and Ce–Mn were investigated for elemental mercury (Hg0) capture at 100–350 °C in the absence of HCl in the flue gas. ... The catalyst characterization indicated that the 6%Ce-6%MnOx/Ti-PILC catalyst possessed a large specific surface area and high dispersion of Ce and Mn on the surface. ... The experimental results indicated that the 6%Ce-6%MnOx/Ti-PILC catalyst exhibited high Hg0 capture (>90%) at 100–350 °C. ...

Chuan He; Boxiong Shen; Jianhong Chen; Ji Cai

2014-06-23T23:59:59.000Z

169

Structure of epitaxial (Fe,N) codoped rutile TiO2 thin films...  

NLE Websites -- All DOE Office Websites (Extended Search)

No evidence of structural disorder associated with a high concentration of oxygen vacancies is observed. Substitution of Fe for Ti could not be confirmed, although secondary...

170

Ultraviolet and Visible Photochemistry of Methanol at 3D Mesoporous Networks: TiO2 and Au–TiO2  

Science Journals Connector (OSTI)

A higher excited-state electron density arises for UV-irradiated TiO2 aerogel relative to commercial nanoparticulate TiO2, indicating that 3D networked TiO2 more efficiently separates electron–hole pairs. ... For both UV and visible irradiation, the same light source was employed: a high-pressure 350-W mercury arc lamp (Oriel Corp.) equipped with a water filter to remove IR radiation. ... For visible irradiation, three bandpass filters (70 nm full-width at half-maximum transmission profile) were used with peak transmissions centered at 400, 500, or 550 nm. ...

Dimitar A. Panayotov; Paul A. DeSario; Jeremy J. Pietron; Todd H. Brintlinger; Lindsey C. Szymczak; Debra R. Rolison; John R. Morris

2013-05-23T23:59:59.000Z

171

An application of Ti-K X-ray absorption edges and fine structures to the study of substoichiometric titanium carbide TiC1-x  

E-Print Network (OSTI)

of substoichiometric titanium carbide TiC1-x V. Moisy-Maurice and C. H. de Novion C.E.A./IRDI/DMECN/DTech, Laboratoire des échantillons de TiC1-x, (0,5 ~ 1 - x ~ 0,97). Quand la teneur x en lacunes de carbone augmente, (i 4p du titane (situé à 10-15 eV au-dessus du niveau de Fermi EF dans TiC0,97) se déplace

Paris-Sud XI, Université de

172

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti from radioactive waste  

E-Print Network (OSTI)

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti from radioactive waste

Murphy, A; Davinson, T; Dressler, R; Fallis, J; Kankainen, A; Laird, A; Murphy, C; Seiffert, C; Schumann, D; Stowasser, T; Stora, T; Wang, C; Woods, P

2014-01-01T23:59:59.000Z

173

Effect of TiO2 Content on Ethanol Electrooxidation in Alkaline Media Using Pt Nanoparticles Supported on Physical Mixtures of Carbon and TiO2 as Electrocatalysts  

Science Journals Connector (OSTI)

Pt nanoparticles supported on physical mixtures of carbon and TiO2 (Pt/(C?+?TiO2) electrocatalyst) were tested for ethanol electrooxidation in alkaline media. The electrocatalysts were...2 mass ratios using boroh...

R. F. B. De Souza; G. S. Buzzo; J. C. M. Silva; E. V. Spinacé…

2014-04-01T23:59:59.000Z

174

Lattice Dynamics of NaF  

Science Journals Connector (OSTI)

The results of an extended calculation of the normal modes of the NaF lattice are presented. Three models have been considered: a "rigid-ion" (RI) model, a "deformation-dipole" model with central F--F- short-range interactions (DDNNN), and a "deformation-dipole" model including both central F--F- interactions and a noncentral component in the first-neighbor, short-range interactions [DDNNN(NC)]. For each of these models we have derived frequency spectra for both 300 and 0°K input parameters, the associated dispersion curves for symmetry directions, Debye characteristic temperatures ?D, moment functions ?D(n), and the Na+ and F- Debye-Waller parameters B1 and B2 and their ratio B1B2. Of the three models, the two DD variations give good agreement with the observed dispersion curves, the DDNNN models being slightly better and giving somewhat closer agreement with the observed B values.

Arnold M. Karo and John R. Hardy

1969-05-15T23:59:59.000Z

175

2011 Annual Planning Summary for Defense Nuclear Nonproliferation (NA-20)  

Energy.gov (U.S. Department of Energy (DOE))

The ongoing and projected Environmental Assessments and Environmental Impact Statements for 2011 and 2012 within Defense Nuclear Nonproliferation (NA-20).

176

Technical Design Report, CERN NA63  

E-Print Network (OSTI)

We summarize the status and plans for the 2015 run for the CERN NA63 collaboration. First, we review the motivation for our proposed experiments with the scheduled Ar18+ beam of Feb/Mar 2015. We also show some slightly updated versions of our calculations that better reflect the experimental situation. Then we turn to a detailed description of the detector setup, focusing on the deployment of the MIMOSA detectors.

Mikkelsen, RE; Wistisen, TN

2014-01-01T23:59:59.000Z

177

Multiphonon Optical Spectrum of NaF  

Science Journals Connector (OSTI)

The high-frequency exponential wing of the reststrahlen band of NaF is decomposed into a number of N-phonon absorption spectra (N=2,3,4,5) by means of a temperature analysis. Overall agreement of the individual spectra with recent theoretical predictions is good, except for a fairly pronounced structure which indicates particularly strong contributions from certain frequencies of the TO and LO phonon branches.

Thomas F. McNelly and Dieter W. Pohl

1974-06-10T23:59:59.000Z

178

Gua para a Sustentabilidade Ambiental na UDC  

E-Print Network (OSTI)

#12;#12;#12;Guía para a Sustentabilidade Ambiental na UDC #12;Redacción Dolores Árias Vázquez Juan Introdución 23 Indicadores de sustentabilidade 27 O contorno natural e humanizado 35 Caracterización dos Ambientalización curricular 101 Outros servizos da udC relacionados coa sustentabilidade 105 O medio ambiente

Fraguela, Basilio B.

179

Simply AlF3-treated Li4Ti5O12 composite anode materials for stable...  

NLE Websites -- All DOE Office Websites (Extended Search)

Li4Ti5O12 composite anode materials for stable and ultrahigh power lithium-ion batteries. Simply AlF3-treated Li4Ti5O12 composite anode materials for stable and ultrahigh...

180

Advanced Visible-Light-Driven Self-Cleaning Cotton by Au/TiO2/SiO2 Photocatalysts  

Science Journals Connector (OSTI)

Synergy of Low-Energy {101} and High-Energy {001} TiO2 Crystal Facets for Enhanced Photocatalysis ... Synergy of Low-Energy {101} and High-Energy {001} TiO2 Crystal Facets for Enhanced Photocatalysis ...

RongHua Wang; XiaoWen Wang; John H. Xin

2009-10-29T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning...  

NLE Websites -- All DOE Office Websites (Extended Search)

Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning tunneling microscopy study. Preparation of TiO2(110)-(1x1) Surface via UHV Cleavage: An scanning tunneling...

182

TiO2 nanoparticles on nitrogen-doped graphene as anode material for lithium ion batteries  

Science Journals Connector (OSTI)

Anatase TiO2...nanoparticles in situ grown on nitrogen-doped, reduced graphene oxide (rGO) have been successfully synthesized ... as an anode material for the lithium ion battery. The nanosized TiO2 particles wer...

Dan Li; Dongqi Shi; Zongwen Liu; Huakun Liu…

2013-04-01T23:59:59.000Z

183

Characteristics of V2O5/Ti-PILC catalyst for the reduction of NO by NH3  

Science Journals Connector (OSTI)

Titania-pillared clay (Ti-PILC) as a catalyst support exhibited peculiar physicochemical characteristics compared to that of titania for the reduction of NO by NH3. The morphological variation of Ti-PILC was examined with respect to the preparation method. For the freeze-dried Ti-PILC, the development of needle-like crystallites, which may reveal the formation of a “house-of-cards” structure by delamination of Ti-PILC, has been observed. Ti-PILC catalyst contains high surface acidity examined by NH3 TPD. Without the impregnation of WO3 and MoO3 on V2O5/Ti-PILC catalyst as a promoter, the catalyst exhibits competitive NO removal performance to a commercial V2O5-WO3/TiO2 catalyst. In addition, Ti-PILC catalyst also exhibits the strong sulfur tolerance mainly attributed to the unique pore structure of the catalyst.

Ho Jeong Chae; In-Sik Nam; Young Gul Kim; Hee Sung Yang; Hyun Chul Choi{rk; Seok Lyong Song{rk

1999-01-01T23:59:59.000Z

184

Atomic Layer Deposition of TiO2 on Aerogel Templates: New Photoanodes for Dye-Sensitized Solar Cells  

Science Journals Connector (OSTI)

Atomic layer deposition was employed to coat the aerogel template conformally with various thicknesses of TiO2 with subnanometer precision. ... The TiO2-coated aerogel membranes were incorporated as photoanodes in dye-sensitized solar cells. ...

Thomas W. Hamann; Alex B. F. Martinson; Jeffrey W. Elam; Michael J. Pellin; Joseph T. Hupp

2008-06-18T23:59:59.000Z

185

E-Print Network 3.0 - arteriais na cirurgia Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

na Universidade de Braslia: Prof. Dr. Csar Augusto... na UnB: Ailson Aristarco de Sousa - Secretrio de Recursos Humanos Adlia Betty Ludovico de Almeida... Corporativa na...

186

E-Print Network 3.0 - antimicrobiana na cirurgia Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

na Universidade de Braslia: Prof. Dr. Csar Augusto... na UnB: Ailson Aristarco de Sousa - Secretrio de Recursos Humanos Adlia Betty Ludovico de Almeida... Corporativa na...

187

E-Print Network 3.0 - autogeno na cirurgia Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

na Universidade de Braslia: Prof. Dr. Csar Augusto... na UnB: Ailson Aristarco de Sousa - Secretrio de Recursos Humanos Adlia Betty Ludovico de Almeida... Corporativa na...

188

The effect of Na+ montmorillonite (NaMMT) nanoclay on thermal properties of medium density fiberboard (MDF)  

Science Journals Connector (OSTI)

In this study, the potential use of nanotechnology was evaluated to improve the thermal properties of medium density fiberboard (MDF). For this, Na+ montmorillonite (NaMMT) nanoclay was added to urea formaldehyde...

Reza Zahedsheijani; Mehdi Faezipour…

2012-09-01T23:59:59.000Z

189

Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires  

Science Journals Connector (OSTI)

The current investigation proposes a novel method for simultaneous assessment of the electrochemical and structural fatigue properties of nickel-titanium shape memory alloy (NiTi SMA) wires. The design and layout of an in situ electrochemical cell in a custom-made bending rotation fatigue (BRF) test rig is presented. This newly designed test rig allows performing a wide spectrum of experiments for studying the influence of fatigue on corrosion and vice versa. This can be achieved by performing ex situ and/or in situ measurements. The versatility of the combined electrochemical/mechanical test rig is demonstrated by studying the electrochemical behavior of NiTi SMA wires in 0.9% NaCl electrolyte under load. The ex situ measurements allow addressing various issues for example the influence of pre-fatigue on the localized corrosion resistance or the influence of hydrogen on fatigue life. Ex situ experiments showed that a pre-fatigued wire is more susceptible to localized corrosion. The synergetic effect can be concluded from the polarization studies and specifically from an in situ study of the open circuit potential (OCP) transients which sensitively react to the elementary repassivation events related to the local failure of the oxide layer. It can also be used as an indicator for identifying the onset of the fatigue failure.

Jenni Kristin Zglinski; Matthias Frotscher

2013-01-01T23:59:59.000Z

190

Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires  

SciTech Connect

The current investigation proposes a novel method for simultaneous assessment of the electrochemical and structural fatigue properties of nickel-titanium shape memory alloy (NiTi SMA) wires. The design and layout of an in situ electrochemical cell in a custom-made bending rotation fatigue (BRF) test rig is presented. This newly designed test rig allows performing a wide spectrum of experiments for studying the influence of fatigue on corrosion and vice versa. This can be achieved by performing ex situ and/or in situ measurements. The versatility of the combined electrochemical/mechanical test rig is demonstrated by studying the electrochemical behavior of NiTi SMA wires in 0.9% NaCl electrolyte under load. The ex situ measurements allow addressing various issues, for example, the influence of pre-fatigue on the localized corrosion resistance, or the influence of hydrogen on fatigue life. Ex situ experiments showed that a pre-fatigued wire is more susceptible to localized corrosion. The synergetic effect can be concluded from the polarization studies and specifically from an in situ study of the open circuit potential (OCP) transients, which sensitively react to the elementary repassivation events related to the local failure of the oxide layer. It can also be used as an indicator for identifying the onset of the fatigue failure.

Neelakantan, Lakshman [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600 036 Chennai (India); Zglinski, Jenni Kristin; Eggeler, Gunther [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); Frotscher, Matthias [Ruhr-Universitaet Bochum, Institute for Materials, 44801 Bochum (Germany); CORTRONIK GmbH, 18119 Rostock-Warnemuende (Germany)

2013-03-15T23:59:59.000Z

191

On elongated stacking fault loops in TiAl  

SciTech Connect

Depending upon strain, load orientation, alloy composition and test temperature, the deformation microstructure of TiAl contains a varied density of stacking faults ribbons. The presence of these ribbons is correlated with that of superdislocations with 1/2{l_angle}112[square bracket] Burgers vector. They are elongated along any of the {l_angle}011[square bracket] directions. The present paper focuses on their formation mechanism, especially on the reasons which make that such dipolar defects, though intrinsically unstable, tend to exhibit a reasonably constant width.

Hug, G.; Veyssiere, P. [CNRS-ONERA, Chatillon (France)

1995-12-31T23:59:59.000Z

192

Stable atomic structure of NiTi austenite  

SciTech Connect

Nitinol (NiTi), the most widely used shape-memory alloy, exhibits an austenite phase that has yet to be identified. The usually assumed austenitic structure is cubic B2, which has imaginary phonon modes, hence it is unstable. We suggest a stable austenitic structure that “on average” has B2 symmetry (observed by x-ray and neutron diffraction), but it exhibits finite atomic displacements from the ideal B2 sites. The proposed structure has a phonon spectrum that agrees with that from neutron scattering, has diffraction spectra in agreement with x-ray diffraction, and has an energy relative to the ground state that agrees with calorimetry data.

Zarkevich, Nikolai A [Ames Laboratory; Johnson, Duane D [Ames Laboratory

2014-08-01T23:59:59.000Z

193

Effect of WC/TiC grain size ratio on microstructure and mechanical properties of WCTiCCo cemented carbides  

E-Print Network (OSTI)

of TiC powder as 1 lm. The microstructures of sintered WC­TiC­10 wt%Co cemented carbides were than that expected by modified Hall­Petch type equation. Transverse rupture strength of WC­20TiC­10 wt for decades [1]. Generally, cemented carbides are based on the WC­Co and some cubic carbide such as TiC, Ta

Hong, Soon Hyung

194

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal structures  

E-Print Network (OSTI)

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal-04843 (Metals Program) and Praveen Sinha Fund for Physics Research. L12 DO22 DO23 Cu3Au Al3Ti Al3Zr #12;Outline · Indium was doped in samples of Al3V and Al3Ti (Al3Ti structure) and Al3Zr (Al3Zr structure) by arc

Collins, Gary S.

195

Holographically Defined TiO2 Electrodes for Dye-Sensitized Solar Cells  

Science Journals Connector (OSTI)

Holographically Defined TiO2 Electrodes for Dye-Sensitized Solar Cells ... We analyze the morphological features of the h-TiO2 electrodes and consider their applicability to dye-sensitized solar cells (DSSCs). ... holographic lithography; solar cells ...

Woo-Min Jin; Ju-Hwan Shin; Chang-Yeol Cho; Ji-Hwan Kang; Jong Hyeok Park; Jun Hyuk Moon

2010-10-27T23:59:59.000Z

196

Prediction of a Dirac state in monolayer TiB2  

Science Journals Connector (OSTI)

We predict the existence of a Dirac state in a monolayer TiB2 sheet (m?TiB2), a two-dimensional metal diboride, based on first-principles calculations. The band structure of m?TiB2 is found to be characterized with anisotropic Dirac cones with the largest Fermi velocity of 0.57×106 m/s, which is about one-half of that of graphene. The Dirac point is located at the Fermi level between the K and ? points, with the Dirac states arising primarily from the d orbitals of Ti. Freestanding m?TiB2 exhibits a bending instability, so that a planar m?TiB2 needs to be stabilized on a substrate. The calculation of m?TiB2 on a h-BN substrate reveals a negligible influence of the h-BN substrate on the electronic properties of m?TiB2. Our findings extend the Dirac materials to metal diborides.

L. Z. Zhang; Z. F. Wang; S. X. Du; H.-J. Gao; Feng Liu

2014-10-03T23:59:59.000Z

197

Solar Energy Materials & Solar Cells 71 (2002) 261271 Photoelectric behavior of nanocrystalline TiO2  

E-Print Network (OSTI)

Solar Energy Materials & Solar Cells 71 (2002) 261­271 Photoelectric behavior of nanocrystalline Ti 100101, People's Republic of China e Synchrotron Radiation Laboratory at Institute of High Energy Physics. A sandwich-type solar cell fabricated by this dye-sensitized nanocrystalline TiO2 film generated 6:1 mA cm�2

Huang, Yanyi

198

A Low Noise NbTiN-based 850 GHz SIS Receiver for the  

E-Print Network (OSTI)

the 350 micron atmospheric window. This frequency band lies entirely above the energy gap of niobium (700 that consists of two Nb/AlN/NbTiN tunnel junctions, NbTiN thin-film microstrip tuning elements, and a Nb window was deployed at the CSO. It used a novel 1 µm thick Silicon Nitride membrane which support an all

199

Interaction of CO2 with Oxygen Adatoms on Rutile TiO2(110). ...  

NLE Websites -- All DOE Office Websites (Extended Search)

CO2 with Oxygen Adatoms on Rutile TiO2(110). Interaction of CO2 with Oxygen Adatoms on Rutile TiO2(110). Abstract: The interactions of CO2 with oxygen adatoms (Oa’s) on...

200

Carbon monoxide annealed TiO2 nanotube array electrodes for efficient biosensor applications  

E-Print Network (OSTI)

Carbon monoxide annealed TiO2 nanotube array electrodes for efficient biosensor applications by anodic oxidation of titanium foil followed with O2 and CO annealing were employed as matrices consisted of Ti3+ defects with carbon-doping and exhibited well defined quasi-reversible cyclic voltammetric

Cao, Guozhong

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Highly ordered TiO2 macropore arrays as transparent photocatalysts  

Science Journals Connector (OSTI)

Highly ordered transparent TiO2 macropore arrays were synthesized via a simple glass-clamping method at room temperature. The as-synthesized TiO2 macropore arrays show high transmittance in the visible light region and can be used ...

Yuan Dong; Junfeng Chao; Zhong Xie; Xin Xu; Zhuoran Wang; Di Chen

2012-01-01T23:59:59.000Z

202

Non-linear Damage Accumulation in Au-irradiated SrTiO3. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

Damage Accumulation in Au-irradiated SrTiO3. Abstract: Ion-induced damage in strontium titanate (SrTiO3) has been investigated using 1.0 MeV Au ions at 150 K and room...

203

Surface studies of nitrogen implanted TiO2 Matthias Batzill a,*, Erie H. Morales b  

E-Print Network (OSTI)

.V. All rights reserved. Keywords: Titanium dioxide; Doping; Nitrogen; Surface science 1. IntroductionSurface studies of nitrogen implanted TiO2 Matthias Batzill a,*, Erie H. Morales b , Ulrike Diebold Available online 3 August 2007 Abstract Rutile TiO2(110) single crystals have been doped by nitrogen

Diebold, Ulrike

204

E-Print Network 3.0 - as-cast zr ti Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

page cl-733 Summary: par ajout de ZrOz(Y20,) e t de matdriaux monoxydes t e l s que Sic, Tic, TiN e t B4C. Un renforcement... 304 344 247 344 Composite A120,-ZrO,OY-TiN...

205

Preparation of BaTiO3 nanoparticles by combustion spray pyrolysis Sangjin Leea  

E-Print Network (OSTI)

], hydrothermal [6], and spray pyrolysis [7­9] have been developed to prepare stoichiometric, ultra- fine BaTiO3 process. Hydrothermal BaTiO3 powders [6] are usually a paraelectric cubic phase, which needs additional freedom from hydrocarbon-based chem- icals, and thus avoiding carbon-contamination problems. As a result

Messing, Gary L.

206

Surface Structure of TiO2011-2 1 T. J. Beck,1  

E-Print Network (OSTI)

.43.Bc, 68.47.Gh Titanium dioxide is a promising photocatalyst for the remediation of pollutants of metal oxides [9,10]. In bulk TiO2 the titanium atoms are surrounded by octahedra of six oxygen atoms of the model in Fig. 1.) Such undercoordinated Ti(5) atoms are preferred adsorption sites for a variety

Diebold, Ulrike

207

Li4Ti5O12 heattreated under nitrogen ambient with outstanding rate capabilities  

Science Journals Connector (OSTI)

The powders of spinel Li4Ti5O12 were prepared by heat treating the mixture of rutile TiO2 and Li acetate at 800°C for 3 h under a nitrogen atmosphere and, for comparison, under air as well. The powders ...

Rui Xu; Junrong Li; Zilong Tang; Zhongtai Zhang

2011-01-01T23:59:59.000Z

208

Candidato Situao/Financ. Regime Thiago Marques Toledo Aceito com bolsa de fomento TI  

E-Print Network (OSTI)

/Rec. Prop. TI Diogo Guimarães Rocha Aceito/Rec. Prop. TP Taissa Abdala Filgueiras de Sousa Aceito TI Michele Marcelo de Medeiros Soares Aceito/Rec. Prop. TP Sergio Luiz Rodrigues da Cunha Aceito/Rec. Prop. TP Antônio Francisco da Silva Junior Aceito/Rec. Prop. TP Carlos Lima Dias Aceito/Rec. Prop. TP Fabio da

Rodriguez, Noemi

209

Modulation of over 10{sup 14}?cm{sup ?2} electrons in SrTiO{sub 3}/GdTiO{sub 3} heterostructures  

SciTech Connect

We demonstrate charge modulation of over 10{sup 14}?cm{sup ?2} electrons in a two-dimensional electron gas formed in SrTiO{sub 3}/GdTiO{sub 3} inverted heterostructure field-effect transistors. Increased charge modulation was achieved by reducing the effect of interfacial region capacitances through thick SrTiO{sub 3} cap layers. Transport and device characteristics of the heterostructure field-effect transistors were found to match a long channel field effect transistor model. SrTiO{sub 3} impurity doped metal–semiconductor field effect transistors were also demonstrated with excellent pinch-off and current density exceeding prior reports. The work reported here provides a path towards oxide-based electronics with extreme charge modulation exceeding 10{sup 14}?cm{sup ?2}.

Boucherit, M.; Shoron, O.; Polchinski, C. [Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210 (United States); Jackson, C. A.; Cain, T. A.; Buffon, M. L. C.; Stemmer, S. [Materials Department, University of California, Santa Barbara, California 93106-5050 (United States); Rajan, S. [Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210 (United States); Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 (United States)

2014-05-05T23:59:59.000Z

210

Comparative studies of etching mechanisms of CR-39 in NaOH/H2O and NaOH/ethanol  

E-Print Network (OSTI)

Comparative studies of etching mechanisms of CR-39 in NaOH/H2O and NaOH/ethanol K.C.C. Tse, D Avenue, Kowloon Tong, Hong Kong Available online 13 May 2007 Abstract The bulk etch rate for CR-39 in NaOH/ethanol accumulates on the surface of CR-39 detector during etching in NaOH/ethanol, which is absent during etching

Yu, K.N.

211

Partial Pressure of Saturated Sodium Nitrite Vapor over the System NaNO2-NaNO3  

Science Journals Connector (OSTI)

The partial pressure of sodium nitrite was measured in the system NaNO2-NaNO3...at temperatures of 798, 823, and 848 K and the logarithm of the NaNO2 pressure was obtained as a function of inverse temperature. Th...

V. I. Glazov; G. P. Dukhanin; M. Kh. Dkhaibe…

2004-02-01T23:59:59.000Z

212

Gamow-Teller strength in Na23(n,p) and a comparison to Na23(?-,?)  

Science Journals Connector (OSTI)

We report measurements of the Na23(n,p) differential cross section at an incident energy of 198 MeV and angles from 0° to 24° using the TRIUMF Charge Exchange Facility. From these data we determine Gamow-Teller (GT) transition probabilities to low lying 1/2+, 3/2+, and 5/2+ Ne23 states and the GT+ strength distribution up to 25 MeV excitation energy. The values of BGT+ to discrete states, and the GT+ strength below 10 MeV, are found to be in reasonable agreement with a full 1s-0d shell model calculation with a normalization factor of about 0.74. The GT+ strength above 10 MeV suggests the removal of strength from lower to higher excitation energies. We also compare the Na23(n,p) data with Na23(?-,?) data and find agreement between the values of BGT+ to discrete levels extracted from the (n,p) and (?-,?) reactions. The general consistency of the (n,p) and (?-,?) data, and the full 1s-0d shell model calculation, give confidence in a recent extraction of the weak pseudoscalar coupling from ?- capture on Na23. Finally, using both ?--decay and ?- capture data, we obtain unit cross sections from the Na23(n,p) measurement.

B. Siebels; T. P. Gorringe; W. P. Alford; J. Bauer; J. Evans; S. El-Kateb; K. P. Jackson; A. Trudel; S. Yen

1995-09-01T23:59:59.000Z

213

CdS quantum dot sensitized nanocrystalline Gd-doped TiO2 thin films for photoelectrochemical solar cells  

Science Journals Connector (OSTI)

CdS quantum dot sensitized Gd-doped TiO2 nanocrystalline thin films have been prepared by chemical method. X-ray diffraction analysis reveals that TiO2 and Gd-doped TiO2...nanocrystalline thin films are of anatas...

A. Ranjitha; N. Muthukumarasamy…

2013-08-01T23:59:59.000Z

214

Preparation of Al2O3/TiO2-containing Coating on Aluminium Alloys by Micro-arc Oxidation  

Science Journals Connector (OSTI)

TiO2-containing ceramic coatings were deposited on the surface of aluminium alloys by micro-arc oxidition. Surface and cross-section topograph of ceramic coating were observed using scanning electron microscopy (SEM). The phase composition of ceramic ... Keywords: Micro-arc oxidation, TiO2 additive, Al2O3/TiO2 phase, antiwear behavior

Cheng Gao; Jinyong Xu; Yusheng Lan; Yonghui Ma; Weixiang Su; Yajuan Liu

2010-03-01T23:59:59.000Z

215

Characterization for strontium titinateFe3O4 and TiNFe3O4 interfaces A. Lussiera)  

E-Print Network (OSTI)

Characterization for strontium titinateÃ?Fe3O4 and TiNÃ?Fe3O4 interfaces A. Lussiera) and Y. U The interface formation between different thicknesses of strontium titanate (SrTiO3) or titanium nitride Ti

Idzerda, Yves

216

Modelling the coarsening behaviour of TiC precipitates in high-strength, low-alloy steels  

E-Print Network (OSTI)

Modelling the coarsening behaviour of TiC precipitates in high-strength, low-alloy steels Jae Hoon­sheet steels rely on a dispersion of fine precipitates based on TiC, generated during the major phase changes of the stoichiometry of titanium and carbon. The purpose was to assess the influences of interface energy and Ti/C

Cambridge, University of

217

Hydrothermal Synthesis of Dy-Doped BaTiO3 Powders ERSIN E. OREN and A. CUNEYT TAS  

E-Print Network (OSTI)

. Hydrothermal processing sis method used and temperature, may exhibit four different of BaTiO3 powders has) are "ferroelectric." hydrothermal processing required a pH 12 in the aqueous BaTiO3 is of the tetragonal symmetryHydrothermal Synthesis of Dy-Doped BaTiO3 Powders ERSIN E. OREN and A. CUNEYT TAS Submicron

Tas, A. Cuneyt

218

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy study  

E-Print Network (OSTI)

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy, Texas 77843-3255 Received 14 October 1997; accepted 6 April 1998 Al clusters supported on TiO2(110) have been investigated using scanning tunneling microscopy. Al interacts strongly with the TiO2(110) surface

Goodman, Wayne

219

Comparative study on the corrosion behavior of TiNb and TMA alloys for dental application in various artificial solutions  

E-Print Network (OSTI)

Comparative study on the corrosion behavior of Ti­Nb and TMA alloys for dental application 2011 Keywords: Ti­Nb alloy TMA Corrosion Fluoride Artificial saliva The corrosion behavior of Ti the corrosion resistance of experimental alloys, with the corroded surface being further characterized

Zheng, Yufeng

220

Short-range order of low-coverage Ti/Al,,111...: Implications for hydrogen storage in complex metal hydrides  

E-Print Network (OSTI)

Short-range order of low-coverage Ti/Al,,111...: Implications for hydrogen storage in complex metal-coverage Ti atoms on Al 111 as a model surface system for transition metal doped alanate hydrogen storage the dissociative chemisorption of hydrogen in Ti-doped alanate storage materials. © 2007 American Institute

Ciobanu, Cristian

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Comment on “Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles”  

Science Journals Connector (OSTI)

Comment on “Electron Source in Photoinduced Hydrogen Production on Pt-Supported TiO2 Particles” ... We can suggest at least three more likely (than Ti4+) sources for their mysterious electron donor:? (1) an overlooked inorganic species, (2) Ti3+, and/or (3) organic impurities. ...

Craig L. Perkins; Michael A. Henderson; David E. McCready; Greg S. Herman

2000-12-05T23:59:59.000Z

222

On the remarkable optical and structural transformations in Mg-Ti-H thin  

NLE Websites -- All DOE Office Websites (Extended Search)

On the remarkable optical and structural transformations in Mg-Ti-H thin On the remarkable optical and structural transformations in Mg-Ti-H thin films Speaker(s): Dana Borsa Date: October 16, 2006 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Venkat Srinivasan In searching for battery electrode materials, Mg-Ti-H thin films triggered much interest with its hydrogen storage capacity of approx. 4 times larger than that of conventional NiMH batteries [1]. Besides this, the same system has also absolutely remarkable optical properties [2]. Highly reflective in the metallic state, the films become highly absorbing upon hydrogen absorption. Mg0.80Ti0.20Hx thin films combine a high absorption (87% of the solar spectrum) with a low thermal emissivity (only 10%), while after removal of hydrogen Mg0.80Ti0.20 absorbs no more than 1/3 of the solar

223

The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis  

E-Print Network (OSTI)

The 44Ti(t1/2 = 59 y) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in the laboratory the major 44Ti production reaction, 40Ca(alpha,gamma)44Ti (E_cm = 0.6-1.2 MeV/u), by direct off- line counting of 44Ti nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova 44Ti yield by a factor ~2 over previous estimates and bringing it closer to Cas A observations.

H. Nassar; M. Paul; I. Ahmad; Y. Ben-Dov; J. Caggiano; S. Ghelberg; S. Goriely; J. P. Greene; M. Hass; A. Heger; A. Heinz; D. J. Henderson; R. V. F. Janssens; C. L. Jiang; Y. Kashiv; B. S. Nara Singh; A. Ofan; R. C. Pardo; T. Pennington; K. E. Rehm; G. Savard; R. Scott; R. Vondrasek

2006-01-11T23:59:59.000Z

224

Influence of Si content on microstructure of TiAl alloys  

SciTech Connect

A systematic study of four ternary TiAl-based alloys with constant Ti content of 52.2 at. % and variable Si content ranging from 0.3 to 2.7 at. % (Al in balance) was conducted. The alloys were prepared from elemental powders via a route including powder mixing, precompaction, cold extrusion, and reactive hot-isostatic pressing. All investigated alloys contain the intermetallic compounds {gamma}-TiAl, {alpha}{sub 2}-Ti{sub 3}Al, and {zeta}-Ti{sub 5}(Si,Al){sub 3}. The microstructure can be described as a duplex structure (i.e., lamella {gamma}/{alpha}{sub 2} regions distributed in a {gamma} matrix) containing {zeta} precipitates. With increasing Si content, the number of primary {zeta} precipitates increased and the {gamma} grain size became finer while the lamellar volume fraction decreased slightly.

Hsu, F.Y.; Klaar, H.J. [Aachen Univ. of Technology (Germany). Central Lab. of Electron Microscopy] [Aachen Univ. of Technology (Germany). Central Lab. of Electron Microscopy; Wang, G.X. [Zhejiang Univ., Hangzhou (China)] [Zhejiang Univ., Hangzhou (China); Dahms, M. [GKSS Research Center, Geesthacht (Germany)] [GKSS Research Center, Geesthacht (Germany)

1996-04-01T23:59:59.000Z

225

Workforce Statistics - NA-30 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

NA-30 | National Nuclear Security Administration NA-30 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Workforce Statistics - NA-30 Home > About Us > Our Operations > Management and Budget > Office of Civil Rights > Workforce Statistics > Workforce Statistics - NA-30 Workforce Statistics - NA-30 Workforce Statistics - Naval Reactors

226

Workforce Statistics - NA 1 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

| National Nuclear Security Administration | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Workforce Statistics - NA 1 Home > About Us > Our Operations > Management and Budget > Office of Civil Rights > Workforce Statistics > Workforce Statistics - NA 1 Workforce Statistics - NA 1 NA 1 FY12 NA 1 Semi Annual Report

227

R ES0 L U TI(it; 1  

NLE Websites -- All DOE Office Websites (Extended Search)

ES0 L U TI(it; 1\ (;. ______ ES0 L U TI(it; 1\ (;. ______ lH T the i\£ '-'yor of tl,e Ctty of AmarHlo i.lli hE'rretr\ IHlthortzeti ~.nd directed to execute on oot~lf of the City ci:~ n,l!lnllo a contract between the Vnited :3rates o.f j\ ITJerica, reoresented by the l:"nited. Statf'8 p, tomie Ener~y CommiluJion. Amari.no .f~rea (,(fice, and dest!5nsted as Contract '1 (2~)-2) 224.9 ar"d the Citj Dr /\r:rarillo. Te:k.1ll8. authorilol.n'l the use of certain oroperty located a.t the .Amarino ,,\ir J'o:rc. Base by the Atorr,ic J~n~r~.v Co.n.lmiesion of the United Staws.. .). .. ~ 1/ . * 13.' .. ·If? . Contract AT(29-2)2249 CONTRACT This CONTRACT, entered into effective as hereinafter provided, by and between THE UNITED STATES OF AMERICA (hereinafter called the "Government

228

Superplastic foaming of titanium and Ti-6Al-4V  

SciTech Connect

Solid-state foaming of metals can be achieved by hot-isostatic pressing of powders in presence of argon followed by expansion of the resulting high-pressure argon bubbles at ambient pressure and elevated temperature. This foaming technique was first demonstrated by Kearns et al. for Ti-6Al-4V, but is limited by its low creep rate and ductility, which lead to early cell wall fracture. The authors address these issues by performing the foaming step under superplastic conditions. Rather than using microstructural superplasticity (requiring fine grains which are difficult to achieve in porous powder-metallurgy materials), they used transformation superplasticity, which occurs at all grain sizes by biasing with a deviatoric stress (from the pore pressure) of internal stresses (from the allotropic mismatch during thermal cycling about the allotropic temperature range). As compared to control experiments performed under isothermal creep conditions, superplastic foaming under temperature cycling of unalloyed titanium and alloyed Ti-6Al-4V led to a significantly higher pore volume fraction and higher foaming rate.

Dunand, D.C. [Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering; Teisen, J. [Swiss Federal Inst. of Tech., Zuerich (Switzerland). Dept. of Materials

1998-12-31T23:59:59.000Z

229

" East North Central",751,"NA",539,650,639,792.21608  

U.S. Energy Information Administration (EIA) Indexed Site

" 60 Years or More","NA","NA",451,554,570,655.17061 "Race of Householder1" " White",723,"NA",547,647,670,787.95276 " Black ",869,"NA",579,695,655,735.14449 " Other...

230

" East North Central",627,"NA",550,553,574,585.28553  

U.S. Energy Information Administration (EIA) Indexed Site

" 60 Years or More","NA","NA",460,466,495,493.22529 "Race of Householder1" " White",610,"NA",556,546,581,592.79398 " Black ",734,"NA",581,578,564,564.24899 " Other...

231

Thermodynamics of TiO{sub x} in blast furnace-type slags  

SciTech Connect

Equilibrium studies between CaO-SiO{sub 2}-10 pct MgO-Al{sub 2}O{sub 3}-TiO{sub 1.5}-TiO{sub 2} slags, carbon-saturated iron, and a carbon monoxide atmosphere were performed at 1773 K to determine the activities of TiO{sub 1.5} and TiO{sub 2} in the slag. These thermodynamic parameters are required to predict the formation of titanium carbonitride in the blast furnace. In order to calculate the activity of titanium oxide, the activity coefficient of titanium in carbon-saturated iron-carbon-titanium alloys was determined by measuring the solubility of titanium in carbon-saturated iron in equilibrium with titanium carbide. The solubility and the activity coefficient of titanium obtained were 1.3 pct and 0.023 relative to 1 wt pct titanium in liquid iron or 0.0013 relative to pure solid titanium at 1773 K, respectively. Over the concentration range studied, the effect of the TiO{sub x} content on its activity coefficient is small. In the slag system studied containing 35 to 50 pct CaO, 25 to 45 pct SiO{sub 2}, 7 to 22 pct Al{sub 2}O{sub 3}, and 10 pct MgO, the activity coefficients of TiO{sub 1.5} and TiO{sub 2} relative to pure solid standard states range from 2.3 to 8.8 and from 0.1 to 0.3, respectively. Using thermodynamic data obtained, the prediction of the formation of titanium carbonitride was made. Assuming hypothetical TiO{sub 2}, i.e., total titanium in the slag expressed as TiO{sub 2}, and using the values of the activity coefficients of TiO{sub 1.5} and TiO{sub 2} determined, the equilibrium distribution of titanium between blast furnace-type slags and carbon-saturated iron was computed. The value of [pct Ti]/(pct TiO{sub 2}) ranges from 0.1 to 0.2.

Morizane, Y.; Ozturk, B.; Fruehan, R.J. [Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering

1999-02-01T23:59:59.000Z

232

Neutron halos in the Na isotopes  

Science Journals Connector (OSTI)

The neutron and proton density distributions of the Na isotopes out to the proton and neutron drip lines are calculated in the spherical Hartree-Fock model with a wide variety of density-dependent Skyrme interactions. The results are compared to recent experimental data for the interaction cross sections and for the rms radii. We discuss the role of the deformed intruder states and the problems associated with predicting the location of the neutron drip line for this mass region. © 1996 The American Physical Society.

B. A. Brown and W. A. Richter

1996-08-01T23:59:59.000Z

233

Multiphonon Absorption in NaF  

Science Journals Connector (OSTI)

The infrared absorption in NaF at the two CO2 laser wavelengths 10.6 and 9.3 ?m was measured between 4 and 400 K. The results complement the previously measured absorption for higher temperatures, and allow for a detailed comparison with theoretical predictions. The experimental temperature dependence at 10.6 ?m can be excellently fitted by a curve expected for three-phonon processes in the whole temperature range; the absorption at 9.3 ?m fits a mixture of three- and four-phonon processes.

Dieter W. Pohl and Peter F. Meier

1974-01-14T23:59:59.000Z

234

Consolidation Process in Near Net Shape Manufacturing of Armstrong CP-Ti/Ti-6Al-4V Powders  

SciTech Connect

This paper summarizes our recent efforts to develop the manufacturing technologies of consolidated net-shape components by using new low-cost commercially pure titanium (CP-Ti) and Ti-6Al-4V alloy powders made by the Armstrong process. Fabrication processes of net shape/ near net shape components, such as uniaxial die-pressing, cold isostatic pressing (CIP), sintering, roll compaction and stamping, have been evaluated. The press-and-sinter processing of the powders were systematically investigated in terms of theoretical density and microstructure as a function of time, pressure, and temperature. Up to 96.4% theoretical density has been achieved with the press-and-sinter technology. Tensile properties of the consolidated samples exhibit good ductility as well as equivalent yield/ultimate tensile strengths to those of fully consolidate materials, even with the presence of a certain amount of porosity. A consolidation model is also under development to interpret the powder deformation during processing. Net shape components made of the Armstrong powder can successfully be fabricated with clearer surface details by using press-and-sinter processing.

Yamamoto, Yukinori [ORNL; Kiggans, Jim [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Sabau, Adrian S [ORNL; Peter, William H [ORNL

2010-01-01T23:59:59.000Z

235

High-Resolution Soft X-Ray Spectral Analysis in the CK Region of Titanium Carbide (TiC) using the DV-X alpha Molecular Orbital Method  

E-Print Network (OSTI)

1 XRD pattern of the measured TiC powder sample. Figure 2XAS. Intensity (arb. units) TiC X-ray: Cu K? voltage: 40 kVintensity (arb. units) CK-XES TiC b a c HOPG e f CK-XAS TiC

Shimomura, Kenta

2010-01-01T23:59:59.000Z

236

Influence of the Operating Parameters on the Selective Catalytic Reduction of NO with Hydrocarbons Using Cu-Ion-Exchanged Titanium-Pillared Interlayer Clays (Ti-PILCs)  

Science Journals Connector (OSTI)

General Ti-PILC Characterization. Figure 1 shows the XRD patterns of the parent Ti-PILC calcined at different temperatures and of the original clay. ... Figure 1 X-ray diffraction (XRD) patterns for the Ti-PILC catalyst calcined at different temperatures. ... Figure 2 N2 adsorption?desorption isotherms for the Ti-PILC catalyst and the original clay. ...

José L. Valverde; Antonio de Lucas; Fernando Dorado; Amaya Romero; Prado B. García

2005-03-18T23:59:59.000Z

237

Developing TiAIN Coatings for Intermediate Temperature-Solid Oxide Fuel Cell Interconnect Applications  

SciTech Connect

TiN-type coatings have potential to be used as SOFC interconnect coatings SOFC because of their low resistance and high temperature stability. In this research, various (Ti,Al)N coatings were deposited on stainless steels by filtered-arc method. ASR and XRD tests were conducted on these coatings, and SEM/EDAX analysis were conducted after ASR and XRD tests. SEM/EDAX analyses show that (Ti,Al)N remains stable at temperature up to 700°C. It is also indicated that Al has beneficial effect on the stability of TiN type coatings. At 900°C, (Ti-30Al)N is fully oxidized and some of (Ti-50Al)N coating still remains as nitride. The analyses on cross-sectional samples show that these coatings are effective barrier to the Cr migration. In summary, (Ti.Al)N coatings are good candidates for the SOFC interconnect applications at 700°C. The future directions of this research are to improve the stability of these coatings by alloy-doping and to develop multi-layer coatings.

Liu, X. (West Virginia University); Johnson, C.D.; Li, C. (West Virginia University); Xu, J. (West Virginia University); Cross, C.

2007-02-01T23:59:59.000Z

238

TiB2/Ni coatings on surface of copper alloy electrode prepared by electrospark deposition  

Science Journals Connector (OSTI)

In order to improve the lifespan of spot-welding electrodes used for welding zinc coated steel sheets, titanium diboride was deposited onto their surface after precoating nickel as an intermediate layer. The microstructures and phase compositions of TiB2 and Ni coatings were characterized by SEM and XRD. The coating hardness was measured using a microhardness tester. The results indicate that a satisfactory TiB2 coating is obtained as a result of the intermediate nickel layer acting as a good binder between the TiB2 coating and the copper alloy substrate. Owing to its capacity of deforming, the precoated nickel layer is dense and crack free, while cracks and pores are observed in the TiB2 coating. The hardness of the TiB2/Ni coating decreases with the increase of voltage and capacitance because of the diffusion of copper and nickel and the oxidation of the coating materials. Because of the good thermal and electrical conductivities and high hardness properties of TiB2, the deformation of the electrode with TiB2/Ni coating is reduced and its spot-welding life is by far prolonged than that of the uncoated one.

Cheng LUO; Xiang XIONG; Shi-jie DONG

2011-01-01T23:59:59.000Z

239

Transition metal atoms pathways on rutile TiO{sub 2} (110) surface: Distribution of Ti{sup 3+} states and evidence of enhanced peripheral charge accumulation  

SciTech Connect

Charge transfer between metal nanoparticles and the supported TiO{sub 2} surface is primarily important for catalytic applications as it greatly affects the catalytic activity and the thermal stability of the deposited nanoparticles on the surface. Herein, systematic spin-polarized density functional and HSE06 calculations are performed to evaluate the adsorption, diffusion, and charge state of several transition metal monomers on both stoichiometric and reduced rutile TiO{sub 2} (110) surface. Although the presence of oxygen vacancy (O{sub v}) increases the binding of Au, Pt and Pd on the surface, it weakens the interaction thus enhancing the diffusion for Fe, Co, Ni, Ag, and Cu adatoms on the surface. For pristine reduced surface, only a small portion (around 5%) of the excess electrons occupy the topmost surface, which are mainly delocalized at the second nearest and third nearest fivefold coordinated Ti (Ti{sub 5c}) atoms. Excess electrons populating at the Ti{sub 5c} atoms on the basal plane can be transferred to strongly electronegative adsorbates like Au and Pt thus enabling a moderate adsorption at this site, whereas no stable adsorption is found for other less electronegative transition metal adatoms (Ag, Cu, Fe, Co, Ni, and Pd) on the reduced surface and for all the adatoms on stoichiometric surface. This result clarifies the origin of the experimental observation of the adsorption of O{sub 2} and CO molecules at Ti{sub 5c} sites in connection with charge transfer. In addition, the spatial redistribution of the excess electrons around the O{sub v} upon the adsorption of the monomers is thoroughly examined. Our finding of an accumulation of excess electrons at the Ti{sub 5c} sites around the monomers explains the critical role of the perimeter interface of the deposited nanoparticles in promoting the adsorption and activation of reactants observed in experiments.

Cai Yongqing; Bai Zhaoqiang; Chintalapati, Sandhya; Feng Yuanping [Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Zeng Qingfeng [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072 (China)

2013-04-21T23:59:59.000Z

240

Effect of crystal phases of titanium dioxide on adsorption performance of H2TiO3-lithium adsorbent  

Science Journals Connector (OSTI)

Abstract Different crystal phases of TiO2 were produced by calcinations of metatitanic acid at various temperatures. H2TiO3-lithium adsorbent was obtained from the acid-modified adsorbent precursor Li2TiO3 which was synthesized by a solid-phase reaction between TiO2 and LiOH·H2O. Effects of crystal phases of TiO2 on the pull-out rate of Li+ from Li2TiO3 and adsorption properties of lithium adsorbent were studied. The results indicate that anatase structure rather than rutile reacted with LiOH·H2O aids the extraction of Li+ and the adsorption performance of lithium adsorbent. The maximum Li+ drawn out ratio from Li2TiO3 reaches 98.69%, and the maximum saturated adsorptive capacity comes up to 39.2 mg g?1.

Liyuan Zhang; Dali Zhou; Gang He; Fanhou Wang; Jiabei Zhou

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Novel Au-TiC Catalysts for CO Oxidation and Desulfurization Processes  

SciTech Connect

Recent articles dealing with the physical and chemical properties of novel Au-TiC catalysts are reviewed. High-resolution photoemission, scanning tunneling microscopy and first-principles periodic density-functional calculations were used to study the deposition of gold on a TiC(0 0 1) surface. Gold grows forming two-dimensional (very low coverage) and three-dimensional (medium and large coverage) islands on the carbide substrate. A positive shift in the binding energy of the C 1s core level is observed after the deposition of Au on TiC(0 0 1). The results of the density-functional calculations corroborate the formation of Au-C bonds. In general, the bond between Au and the TiC(0 0 1) surface exhibits very little ionic character, but there is a substantial polarization of electrons around Au that facilitates bonding of the adatoms with electron-acceptor molecules (CO, O{sub 2}, C{sub 2}H{sub 4}, SO{sub 2}, thiophene, etc.). Experimental measurements indicate that Au/TiC(0 0 1) is a very good catalysts for the oxidation of CO, the destruction of SO{sub 2} and the hydrodesulfurization of thiophene. At temperatures below 200 K, Au/TiC(0 0 1) is able to perform the 2CO + O{sub 2} {yields} 2CO{sub 2} reaction and the full decomposition of SO{sub 2}. Furthermore, in spite of the very poor hydrodesulfurization performance of TiC(0 0 1) or Au(1 1 1), a Au/TiC(0 0 1) surface displays a hydrodesulfurization activity higher than that of conventional Ni/MoS{sub x} catalysts. Metal carbides are excellent supports for enhancing the chemical reactivity of gold. The Au/TiC system is more chemically active than systems generated by depositing Au nanoparticles on oxide surfaces.

J Rodriguez; P Liu; Y Takahashi; F Vines; L Feria; E Florez; K Nakamura

2011-12-31T23:59:59.000Z

242

Formation of Ti-B surface alloys by excimer laser mixing  

SciTech Connect

We have formed a surface Ti-B alloy by excimer laser mixing of a single B layer on a Ti-6Al-4V alloy substrate. Rutherford backscattering spectroscopy indicates a uniform B:Ti ratio of approximately 0.7 in the surface layer. A Boron layer 60 nm thick resulted in an alloy layer approximately 200 nm thick. There is little indication, by either Auger electron spectroscopy or nuclear reaction analysis, of substantial oxygen incorporation in the surface alloy despite the fact that the processing was done in air. Transmission electron microscopy of the surface alloy shows a completely amorphous surface layer underlain by a martensitic structure.

Jervis, T.R.; Nastasi, M.; Hirvonen, J.P.; Zocco, T.G.

1990-01-01T23:59:59.000Z

243

Initial reactions in Ti{endash}Si bilayers: New indications from in situ measurements  

SciTech Connect

The interactions occurring in a Ti{endash}Si bilayer have been investigated by in situ resistance measurements and the reaction products have been analyzed by complementary techniques, such as x-ray diffraction, Auger electron spectroscopy, and MeV {sup 4}He{sup +} Rutherford backscattering. The measurements were performed by heating the samples at a constant rate in the 5{endash}425{degree}C/min range. The samples are 60 nm of titanium sputter deposited on 250 nm of a silicon film deposited by chemical vapor technique; the bilayers were placed on 650 nm of SiO{sub 2}, thermally grown on p-type {l_angle}100{r_angle} silicon wafers. Samples were also prepared by reactively depositing 25 nm of TiN on the Ti film. The TiN cap, deposited without breaking the vacuum, protects the metal films from contaminants, namely oxygen, during handling and heat treatments. It has been shown that, at temperatures around 400{degree}C and before any massive Ti{endash}Si interaction, the resistance increases. This effect, attributed in the literature to the silicon diffusion in the metal film, is due to oxygen, generally contained in the annealing ambient, which diffuses in the Ti film. The Ti{endash}Si reaction produces a decrease in the value of resistance; the first decrease, generally attributed to the formation of a C49{endash}TiSi{sub 2} phase, is due to the growth of an amorphous compound having a graded in-depth composition between Ti{sub 5}Si{sub 3} and TiSi. The activation energy for such formation is 2.8{+-}0.1 eV. At higher temperatures C49{endash}TiSi{sub 2} starts to form, more likely between the silicon and the amorphous layer. The formation of silicide induces a segregation of oxygen in the unreacted Ti film, thus slowing down the growth of silicide. {copyright} 2001 American Institute of Physics.

Cocchi, R.; Giubertoni, D.; Ottaviani, G.; Marangon, T.; Mastracchio, G.; Queirolo, G.; Sabbadini, A.

2001-06-01T23:59:59.000Z

244

Development and scale-up of the low density core process for Ti-64  

SciTech Connect

The Low Density Core (LDC) process is a method for making metallic structures with solid surfaces covering a porous core. The development of the LDC process for making Ti-64 sheet based structures is described. Sheets {approximately}2000 x 1200 x 4 mm{sup 3} have been made with {approximately}40 vol.% core porosity levels, and several forming techniques have been demonstrated. The LDC billet breakdown and forming behavior was found to be similar to conventional Ti-64 processes, so LDC Ti-64 sheet has the advantage that it can be fabricated into structures using well-established methods.

Schwartz, D.S.; Shih, D.S.; Lederich, R.J.; Martin, R.L.; Deuser, D.A. [Boeing Co., St. Louis, MO (United States)

1998-12-31T23:59:59.000Z

245

Electron Source in Photoinduced Hydrogen Production on Pt-supported TiO2 Particles  

Science Journals Connector (OSTI)

Electron Source in Photoinduced Hydrogen Production on Pt-supported TiO2 Particles ... After recovering the TiO2/Pt particles used in the long-term reaction, they were reused in a photocatalytic H+ reduction by adding methanol as an electron donor, but no H2 production was observed showing that the TiO2/Pt particles have lost their photocatalytic activity after the long-term reaction. ... A 100 W high-pressure Hg lamp was used as a light source. ...

Toshiyuki Abe; Eiji Suzuki; Kentaro Nagoshi; Kohichi Miyashita; Masao Kaneko

1999-02-04T23:59:59.000Z

246

Fabrication of TiO{sub 2} nanocrystallized glass  

SciTech Connect

Nanocrystallization of rutile and anatase was observed in a CaO-B{sub 2}O{sub 3}-Bi{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} crystallized glass. The color of the present crystallized glass was changed by the heat-treatment temperature, and x-ray diffraction (XRD) patterns of the crystallized glass show that the apparent color change is correlated with the formation of titania nanocrystallites. The particle size of crystallites observed in the transmission electron microscope image is comparable to that measured by XRD pattern. In addition, a large change of refractive index between the rutile particles and glass matrix, 0.8 or larger, was obtained. The present titania crystallized glass will be not only a photocatalytic material but also a promising candidate for random lasing devices.

Masai, Hirokazu; Fujiwara, Takumi; Mori, Hiroshi; Komatsu, Takayuki [Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Sendai 980-8579 (Japan); Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188 (Japan)

2007-02-19T23:59:59.000Z

247

Text na web Zprva esitele o vsledcch esen projektu  

E-Print Network (OSTI)

Text na web Zpr�va esitele o v�sledc�ch esen� projektu ,,Digitalizace a zvysov�n� kvality v�ch pep�nac. 1 #12;Text na web 6. Financn� prostedky pl�novan� na rozs�en� on-line p�stupu do studijn Web of Knowledge, ACM Digital Library, AMS Books Online, MathSciNet, SpringerLink eBooks atd.), kter

Cerveny, Vlastislav

248

Crnica: "A horta na cidade" (Primavera Ambiental 2013)  

E-Print Network (OSTI)

Crónica: "A horta na cidade" (Primavera Ambiental 2013) O pasado mércores 10 de abril tivo lugar na con ADEGA. A actividade que leva por título "A horta na cidade" consistiu nunha conferencia a cargo de, Isabel Barrio explicounos os pros e contras dos diferentes tipos de hortas urbanas, dende as máis básicas

Fraguela, Basilio B.

249

Molecular beam epitaxial growth and characterization of mixed (Ti,Nb)O{sub 2} rutile films on TiO{sub 2}(100)  

SciTech Connect

Epitaxial films of mixed (Nb,Ti)O{sub 2} rutile have been grown on TiO{sub 2}(100) rutile at 600{degree}C by molecular beam epitaxy. These films grow in a laminar fashion for Nb mole fractions up to {approximately}0.10. In addition, reflection high-energy and low-energy electron diffraction, along with x-ray photoelectron diffraction and Rutherford backscattering reveal that the overlayers possess excellent long- and short-range structure order up to 10 at.{percent}. However, strain-induced disorder becomes prevalent for higher Nb mole fractions, and the surfaces roughen and become defected accordingly. X-ray photoelectron diffraction and Rutherford backscattering reveal that Nb atoms substitutionally incorporate at cation sites in the rutile lattice for all Nb mole fractions investigated, leading to a mixed rutile Nb{sub {ital x}}Ti{sub 1{minus}{ital x}}O{sub 2} phase. Analysis of Nb 3{ital d} and Ti 2{ital p} core-level binding energies reveals that the oxidation state of both Ti and Nb is +4. {copyright} {ital 1996 American Vacuum Society}

Chambers, S.A.; Gao, Y.; Thevuthasan, S.; Liang, Y. [Environmental Molecular Sciences Laboratory, Pacific Northwest Laboratory, Richland, Washington 99352 (United States)] [Environmental Molecular Sciences Laboratory, Pacific Northwest Laboratory, Richland, Washington 99352 (United States); Shivaparan, N.R.; Smith, R.J. [Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)] [Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)

1996-05-01T23:59:59.000Z

250

The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders  

SciTech Connect

This paper investigated the die-pressing and sintering behavior of the low-cost CP-Ti and Ti-6Al- 4V powders made by the Armstrong Process . The Armstrong powders have an irregular coral like, dendritic morphology, with a dendrite size of approximately 2-5 m. As-received as well as milled powders were uniaxially pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. In the studied pressure range, an empirical powder compaction equation was applied to linearize the green density pressure relationship, and powder compaction parameters were obtained. The Armstrong Ti-64 powder exhibited a significantly higher sinterability than the CP-Ti powder. This was explained to be due to the higher diffusivity of V at the sintering temperature. The Ti-64 samples with a green density of 71.0% increased to 99.6% after sintering at 1300oC for 1 hour. An ex-situ technique was used to track the powder morphology change before and after sintering.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Muth, Thomas R [ORNL; Blue, Craig A [ORNL; Williams, James C [Ohio State University; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2012-01-01T23:59:59.000Z

251

Stoichiometry-driven metal-to-insulator transition in NdTiO{sub 3}/SrTiO{sub 3} heterostructures  

SciTech Connect

By controlling stoichiometry via a hybrid molecular beam epitaxy approach, we report on the study of thin film growth and the electronic transport properties of phase-pure, epitaxial NdTiO{sub 3}/SrTiO{sub 3} heterostructures grown on (001) (La{sub 0.3}Sr{sub 0.7})(Al{sub 0.65}Ta{sub 0.35})O{sub 3} (LSAT) substrates as a function of cation stoichiometry in NdTiO{sub 3}. Despite the symmetry mismatch between bulk NdTiO{sub 3} and the substrate, NdTiO{sub 3} films grew in an atomic layer-by-layer fashion over a range of cation stoichiometry; however amorphous films resulted in cases of extreme cation non-stoichiometry. Temperature-dependent sheet resistance measurements were consistent with Fermi-liquid metallic behavior over a wide temperature range, but revealed a remarkable crossover from metal-to-insulator (M-I) type behavior at low temperatures for all compositions. A direct correlation between cation stoichiometry, transport behavior, and the temperature of M-I transition is established.

Xu, Peng; Phelan, Daniel; Seok Jeong, Jong; Andre Mkhoyan, K.; Jalan, Bharat, E-mail: bjalan@umn.edu [Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

2014-02-24T23:59:59.000Z

252

Experimentally determined dissolution kinetics of Na-rich borosilicate...  

NLE Websites -- All DOE Office Websites (Extended Search)

Experimentally determined dissolution kinetics of Na-rich borosilicate glass at far from equilibrium conditions: Implications Experimentally determined dissolution kinetics of...

253

Crnica I Encontro Solar na UDC O pasado mrcores 24 de abril tivo lugar na Praza da Fraga (Campus da  

E-Print Network (OSTI)

Crónica I Encontro Solar na UDC O pasado mércores 24 de abril tivo lugar na Praza da Fraga (Campus da Zapateira) a primeira edición do Encontro Solar na UDC. Esta era a terceira das actividades exposición de aparellos solares, un obradoiro de gastronomía solar, un Roteiro solar pola UDC e un mercadiño

Fraguela, Basilio B.

254

Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles New developments in nanotechnology offer the creation of chemical-biological hybrid nanocomposites, which can be introduced into cells to initiate intracellular processes or biochemical reactions. Researchers from Northwestern University Medical Center (Chicago, IL) and Argonne National Laboratory synthesized TiO2-oligonucleotide nanocomposites made of DNA oligonucleotides attached to 45-Å TiO2 nanoparticles and tested them by using the 2-ID-E x-ray beamline at the X-ray Operations and Research sector 2 of the APS. A key benefit of nanocomposites is that they could advance medical biotechnology and open new doors in chemistry and materials sciences. Scan of a 21 x 21-m area with a single nucleus containing 3.6 x 106 nanoparticles.

255

Benefits and technological challenges in the implementation of TiO2-based  

NLE Websites -- All DOE Office Websites (Extended Search)

Benefits and technological challenges in the implementation of TiO2-based Benefits and technological challenges in the implementation of TiO2-based ultraviolet photocatalytic oxidation (UVPCO) air cleaners Title Benefits and technological challenges in the implementation of TiO2-based ultraviolet photocatalytic oxidation (UVPCO) air cleaners Publication Type Conference Proceedings Year of Publication 2008 Authors Hodgson, Alfred T., Hugo Destaillats, Toshifumi Hotchi, and William J. Fisk Conference Name Indoor Air 2008 Pagination 17-22 Date Published August 2008 Publisher Indoor Air, Paper ID: 297 Conference Location Copenhagen, Denmark Abstract Indoor air cleaners based on TiO2 photocatalytic oxidation of organic pollutants are a promising technology to improve or maintain indoor air quality while reducing ventilation energy costs. We evaluated the performance of a pilot scale UVPCO air cleaner under realistic conditions in single pass and recirculation modes

256

Imaging Water Dissociation on TiO2(110): Evidence for Inequivalent...  

NLE Websites -- All DOE Office Websites (Extended Search)

OH Groups. Abstract: Identical regions of partially reduced TiO2(110) surfaces with bridge-bonded oxygen vacancy (BBOV) concentrations of 10 % ML (1 ML 5.2×1014 cm-2)...

257

Stacking-velocity inversion with borehole constraints for tilted TI media Xiaoxiang Wang1  

E-Print Network (OSTI)

- ing an accurate anisotropic velocity model remains a challenging problem. For TI models, transverse isotropy with a tilted symmetry axis TTI is an ap- propriate model for dipping shale layers near

Tsvankin, Ilya

258

Fabrication and characterization of porous NiTi Shape Memory Alloy by elevated pressure sintering  

E-Print Network (OSTI)

have not been adequately developed. Currently, three methods are commonly used for producing porous NiTi SMAs from elemental powders. These methods include conventional sintering, Self-propagating High-temperature Synthesis (SHS), and sintering...

Vandygriff, Eric Layton

2012-06-07T23:59:59.000Z

259

Thermomechanical Cyclic Response of TiNiPd High-Temperature Shape Memory Alloys  

E-Print Network (OSTI)

TiNiPd high-temperature shape memory alloys (HTSMAs) have attracted considerable attention as potential solid-state actuators capable of operating at temperatures up to 500 °C, exhibiting excellent corrosion resistance, adequate ductility levels...

Atli, Kadri

2012-10-19T23:59:59.000Z

260

Effect of Aging Heat Treatments on Ni52Ti48 Shape Memory Alloy  

E-Print Network (OSTI)

Ni-rich NiTi shape memory alloys (SMAs) are capable of attaining a wide range of transformation temperatures depending on the heat treatment conditions and superior thermo-mechanical cycling stability, which are desired for repeated solid...

Akin, Erhan

2011-10-21T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Neutron generation induced by laser fusion by using a 10TW femtosecond Ti:Sapphire laser  

Science Journals Connector (OSTI)

A 10TW Ti:Sapphire laser is used to generate DD fusion neutrons and the characteristics of plasma has been investigated. Neutrons are generated from deuterium clusters which are formed...

Nam, Sungmo; Han, Jaemin; Rhee, Yongjoo; Lee, Yongwoo; Cha, Yong-Ho; Cha, Hyung Ki

262

TiO2 Nanoparticles as a Soft X-ray Molecular Probe  

SciTech Connect

With the emergence of soft x-ray techniques for imaging cells, there is a pressing need to develop protein localization probes that can be unambiguously identified within the region of x-ray spectrum used for imaging. TiO2 nanocrystal colloids, which have a strong absorption cross-section within the "water-window" region of x-rays, areideally suited as soft x-ray microscopy probes. To demonstrate their efficacy, TiO2-streptavidin nanoconjugates were prepared and subsequently labeled microtubules polymerized from biotinylated tubulin. The microtubules were imaged using scanning transmission x-ray microscopy (STXM), and the TiO2 nanoparticle tags were specifically identified using x-ray absorption near edge spectroscopy (XANES). These experiments demonstrate that TiO2 nanoparticles are potential probes for protein localization analyses using soft x-ray microscopy.

Larabell, Carolyn; Ashcroft, Jared M.; Gu, Weiwei; Zhang, Tierui; Hughes, Steven M.; Hartman, Keith B.; Hofmann, Cristina; Kanaras, Antonios G.; Kilcoyne, David A.; Le Gros, Mark; Yin, Yadong; Alivisatos, A. Paul; Larabell, Carolyn A.

2007-06-30T23:59:59.000Z

263

Molecular Hydrogen Formation from Proximal Glycol Pairs on TiO2(110)  

SciTech Connect

Understanding hydrogen formation on TiO2 surfaces is of great importance as it could provide fundamental insight into water splitting for hydrogen production using solar energy. In this work, hydrogen formation from glycols having different numbers of methyl end-groups have been studied using temperature pro-grammed desorption on reduced, hydroxylated, and oxidized TiO2(110) surfaces. The results from OD-labeled glycols demon-strate that gas-phase molecular hydrogen originates exclusively from glycol hydroxyl groups. The yield is controlled by a combi-nation of glycol coverage, steric hindrance, TiO2(110) order and the amount of subsurface charge. Combined, these results show that proximal pairs of hydroxyl aligned glycol molecules and subsurface charge are required to maximize the yield of this redox reaction. These findings highlight the importance of geometric and electronic effects in hydrogen formation from adsorbates on TiO2(110).

Chen, Long; Li, Zhenjun; Smith, R. Scott; Kay, Bruce D.; Dohnalek, Zdenek

2014-04-16T23:59:59.000Z

264

Anodic CaO-TiO2 nanotubes composite film for low temperature CO2 adsorption  

Science Journals Connector (OSTI)

A novel one-dimensional anodic CaO-TiO2 nanotubes composite film was prepared using a rapid-anodic oxidation electrochemical anodization technique for low temperature CO2 absorption application. This study aims to determine the ...

Chin Wei Lai

2014-01-01T23:59:59.000Z

265

Atomic Structure of the Anatase TiO2(001) Surface  

SciTech Connect

Understanding the structure of well-defined anatase TiO2 surfaces is critical for deciphering site-specific thermal and photo- reaction mechanisms on anatase TiO2. Using UHV scanning tunneling microscopy (STM), we have studied the atomic structure of anatase TiO2(001) epitaxial thin films grown by oxygen plasma assisted molecular beam epitaxy. Bright rows of the (1×4) reconstructed surface are resolved as three types of features with different sizes. High-resolution STM images taken from the same area at different bias voltages show that these individual features are originated from combinations of two basic atomic building blocks. We propose a modified added molecule model for the anatase TiO2 (001) surface structure.

Xia, Yaobiao; Zhu, Ke; Kaspar, Tiffany C.; Du, Yingge; Birmingham, Blake; Park, Kenneth T.; Zhang, Zhenrong

2013-08-16T23:59:59.000Z

266

Three-Dimensional Imaging of Individual Dopant Atoms in SrTiO3  

E-Print Network (OSTI)

for a specific 3D dopant atom configuration. The methodto have more than 2 Gd atoms in a column is still less thanImaging of Individual Dopant Atoms in SrTiO 3 Jinwoo Hwang,

Hwang, Jinwoo; Zhang, Jack Y; D’Alfonso, Adrian J; Allen, Leslie J; Stemmer, Susanne

2013-01-01T23:59:59.000Z

267

Atomic Structure of the Anatase TiO2(001) Surface. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

deciphering site-specific thermal and photo- reaction mechanisms on anatase TiO2. Using UHV scanning tunneling microscopy (STM), we have studied the atomic structure of anatase...

268

Two Pathways for Water Interaction with Oxygen Adatoms on TiO2...  

NLE Websites -- All DOE Office Websites (Extended Search)

tunneling microscopy and density functional theory studies show that oxygen adatoms (Oa), produced during O2 exposure of reduced TiO2(110) surfaces, alter the water dissociation...

269

E-Print Network 3.0 - al si ti Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

and SiC. Internal grains of SiC and kamaciteiron silicide are also found independent of TiC. The grain... by volume. V and Si were also present in ... Source: Washington...

270

TiO2/graphene nanocomposites as anode materials for high rate lithium-ion batteries  

Science Journals Connector (OSTI)

A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets (GNS) as anode materials for lithium-ion batteries was reported. The morphology and crystal structure...2/GNS electrode ...

Yi-ping Tang ???; Shi-ming Wang ???; Xiao-xu Tan ???…

2014-05-01T23:59:59.000Z

271

Flat panel display using Ti-Cr-Al-O thin film  

DOE Patents (OSTI)

Thin films of Ti--Cr--Al--O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti--Cr--Al--O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti--Cr--Al--O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti--Cr--Al--O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solan Beach, CA)

2002-01-01T23:59:59.000Z

272

TiO2-based photocatalytic process for purification of polluted water: bridging fundamentals to applications  

Science Journals Connector (OSTI)

Recent years have witnessed a rapid accumulation of investigations on TiO2-based photocatalysis, which poses as a greatly promising advanced oxidation technology for water purification. As the ability of this advanced oxidation process is ...

Chuan Wang; Hong Liu; Yanzhen Qu

2013-01-01T23:59:59.000Z

273

The progress of TiO2 nanocrystals doped with rare earth ions  

Science Journals Connector (OSTI)

In the past decades, TiO2 nanocrystals (NCs) have been widely studied in the fields of photoelectric devices, optical communication, and environment for their stability in aqueous solution, being nontoxic, cheapness, and so on. Among the three ...

Hai Liu; Lixin Yu; Weifan Chen; Yingyi Li

2012-01-01T23:59:59.000Z

274

Synthesis and photocatalytic activity of ZnO/TiO2 nanoparticle  

Science Journals Connector (OSTI)

ZnO/TiO2 photocatalysts were synthesised via wet-chemical techniques. These can subsequently be used as efficient photocatalysts which can effectively degrade organic contaminants. Photocatalysts prepared with these techniques were characterised with X-ray diffraction (XRD), infrared (FTIR) spectrophotometer, UV-visible spectroscopy and photo luminescence. XRD confirmed the formation of ZnO/TiO2 nanoparticle. UV-visible spectroscopy showed significant difference in the optical absorption. Enhancement in optical absorption of ZnO/TiO2 indicated that it can be used as an efficient photocatalyst under UV irradiation. The photo-reduction activities of photocatalysts were evaluated using methyl orange as organic contaminant. The experiment demonstrated that the photo-degradation value of ZnO/TiO2 was significantly higher than that of ZnO.

R. Parimaladevi; K. Sumathi

2014-01-01T23:59:59.000Z

275

Comparison of Nb/sub 3/Sn and NbTi superconductor magnet ITER devices  

SciTech Connect

The TETRA tokamak systems code is used to compare designs for the International Thermonuclear Experimental Reactor (ITER) that use Nb/sub 3/Sn and NbTi superconductor magnets. Similar minimum-cost devices are found with both types of conductors when superfluid helium (He-II) is used in conjunction with the NbTi. The cost of using NbTi with He-I cooling is much higher than that of using Nb/sub 3/Sn or NbTi with He-II cooling. Generally, the minimum-cost devices occur for peak fields at the toroidal field coil of about 11.5 - 13 T, depending on the physics requirements. Sensitivities to the allowable stress level indicate strong cost increases when the stress is reduced from the nominal 600-MPa level and weaker cost benefits when the stress is allowed to reach higher levels.

Galambos, J.D.; Peng, Y.K.M.; Reid, R.L.; Lubell, M.S.; Dresner, L.; Miller, J.R.

1989-03-01T23:59:59.000Z

276

Ion-beam engineering of Co/TiO2 multilayer nanostructures  

Science Journals Connector (OSTI)

Multilayer structures consisting of Co/TiO2 bilayers with partial layer thicknesses varied within several nanometers and a total thickness of up to 100 nm were obtained using the ion-beam sputter deposition metho...

A. I. Stognij; M. V. Pashkevich; N. N. Novitskii…

2010-05-01T23:59:59.000Z

277

EPR Study of the Surface Characteristics of Nanostructured TiO2 under UV Irradiation  

E-Print Network (OSTI)

EPR Study of the Surface Characteristics of Nanostructured TiO2 under UV Irradiation Juan M of EPR spectroscopy. The samples of the H series present the smallest crystallite size and after

278

Enhanced Electrooxidation of Ethanol Using Pd/C + TiO2 Electrocatalysts in Alkaline Media  

Science Journals Connector (OSTI)

This work describes the use of Pd nanoparticles synthetized by the borohydride process and supported on physical mixtures of C + TiO2 toward the ethanol electrooxidation reaction in alkaline media. In this...2 ra...

J. C. M. Silva; G. S. Buzzo; R. F. B. De Souza; E. V. Spinacé…

2014-08-01T23:59:59.000Z

279

Hydrothermal ethanol conversion on Ag, Cu, Au/TiO2  

Science Journals Connector (OSTI)

The effect UV irradiation and silver, copper, and gold ions (M z+) supported on titania (anatase) have on the activity of M/TiO2 samples in ethanol conversion at 150–400°C is examined....2 and A...

Do Tkhyui Mai; I. I. Mikhalenko; A. I. Pylinina

2014-10-01T23:59:59.000Z

280

Dimensional dependence of electric resistance of thin TiB2 films  

Science Journals Connector (OSTI)

The dimensional effect of electrical resistance in thin films of TiB2 has been studied. Experimental results were processed within the framework of the Fuchs-Sondheimer theory. This has enabled us to estimate the...

A. S. Dranenko; L. A. Dvorina

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Variation of electrical resistance in superelastic NiTi for sensor applications  

E-Print Network (OSTI)

Nickel-Titanium (NiTi) is a most commonly known as a heat-activated shape memory alloy. However, the material sometimes displays a constant-temperature property called "superelasticity." A superelastic material is one which ...

Russo, Analisa

2008-01-01T23:59:59.000Z

282

Lucas-Kanade Optical Flow Estimation on the TI C66x Digital Signal Processor  

E-Print Network (OSTI)

technology for lightweight mobile platforms. The C66x DSP is based on TI's Keystone architecture and consists, scratchpad, or a mixture of both. Like other VLIW archi- tectures, the compiler must software pipeline each

Bakos, Jason D.

283

Photocatalytic performance of TiO2 thin films connected with Cu micro-grid  

Science Journals Connector (OSTI)

Aiming at reducing the recombination of photo-induced carriers in semiconductor photocatalytic process, we prepared TiO2...thin film with its surface modified by a connected Cu micro-grid via a microsphere lithog...

HaiLing Zhu; JunYing Zhang; TianMin Wang…

2009-08-01T23:59:59.000Z

284

Porous TiO2 microspheres with tunable properties for photocatalytic air purification Alberto Naldoni a,  

E-Print Network (OSTI)

, continuous operation, facile scale-up process from small to large production, and thorough control overPorous TiO2 microspheres with tunable properties for photocatalytic air purification Alberto

Suslick, Kenneth S.

285

Supporting Information Electric Field Reversal of Na2SO4, (NH4)2SO4, and Na2CO3 relative to CaCl2  

E-Print Network (OSTI)

water 1 M Na2 CO3 1 M Na2 SO4 1 M (NH4 )2 SO4 2 M CaCl2 2 M NaCl Re (2) (a.u.) Incident Infrared (cm -1.8 M CaCl2, 1.8 M NaCl, 1.1 M Na2CO3, 1.1 M Na2SO4, and 1.1 M (NH4)2SO4 salt solutions. ExperimentalS1 Supporting Information Electric Field Reversal of Na2SO4, (NH4)2SO4, and Na2CO3 relative to CaCl

286

Hydrogenated TiO{sub 2} film for enhancing photovoltaic properties of solar cells and self-sensitized effect  

SciTech Connect

Hydrogenated TiO{sub 2} film was obtained by annealing TiO{sub 2} film at 350?°C for 2?h with hydrogen, and TiO{sub 2} films were prepared by screen printing on fluorine-doped tin oxide glass. Structural characterization by X-ray diffraction and electron microscopy did not show obvious difference between hydrogenated TiO{sub 2} film and pristine TiO{sub 2} film. Through optical and electrochemical characterization, the hydrogenated TiO{sub 2} film showed enhanced absorption and narrowed band gap, as well as reduced TiO{sub 2} surface impedance and dark current. As a result, an obviously enhanced photovoltaic effect was observed in the solar cell with hydrogenated TiO{sub 2} as photoanode without adding any dye due to the self-sensitized effect of hydrogenated TiO{sub 2} film, which excited electrons injecting internal conduction band of TiO{sub 2} to generate more photocurrent.

He, Hongcai; Yang, Kui; Wang, Ning, E-mail: ning-wang@uestc.edu.cn; Luo, Feifei; Chen, Haijun [State Key Laboratory of Electronic Thin Films and Integrated Devices and School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China)

2013-12-07T23:59:59.000Z

287

Mixed cation phases in sputter deposited HfO{sub 2}-TiO{sub 2} nanolaminates  

SciTech Connect

Nanolaminate HfO{sub 2}-TiO{sub 2} films are grown by reactive sputter deposition on unheated fused SiO{sub 2}, sequentially annealed at 573 to 973 K, and studied by x-ray diffraction. A nanocrystalline structure of orthorhombic (o) HfTiO{sub 4} adjacent to an interface followed by monoclinic (m) Hf{sub 1-x}Ti{sub x}O{sub 2} is identified. m-Hf{sub 1-x}Ti{sub x}O{sub 2}, a metastable phase, is isomorphous with m-HfO{sub 2} and a high pressure phase, m-HfTiO{sub 4}. A Vegard's law analysis shows that the Ti atomic fraction in m-Hf{sub 1-x}Ti{sub x}O{sub 2} is much greater than Ti equilibrium solubility in m-HfO{sub 2}. A space group-subgroup argument proposes that m-Hf{sub 1-x}Ti{sub x}O{sub 2} arises from an o/m-HfTiO{sub 4} second order phase transition to accommodate the larger Hf atom.

Cisneros-Morales, M. C.; Aita, C. R. [Advanced Coatings Experimental Laboratory, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, P.O. Box 784, Milwaukee, Wisconsin 53201 (United States)

2008-07-14T23:59:59.000Z

288

Microstructures and wear properties of TiN-based cermet coating deposited on 1Cr18Ni9Ti stainless steel by electrospark process  

Science Journals Connector (OSTI)

A simple and effective surface treatment technique, electrospark deposition (ESD), has been successfully applied to deposit TiN-based cermet coating on stainless steel substrate. The nitrided coating had an average thickness of about 30 ?m and formed metallurgical bonding with the substrate. The microstructure of the coating was mainly composed of TiN phase and ferrite (?-FeCr) phase. Its microhardness reached 889HV. The experimental results demonstrated that the nitrided coating had an excellent sliding wear resistance because the hard TiN phase distributed in the coating increased the resistance to micro-cutting and plowing during the sliding wear test, which effectively improves the surface performance of stainless steel substrate.

X. Li; D.Q. Sun; X.Y. Zheng; Z.A. Ren

2008-01-01T23:59:59.000Z

289

Waterless TiO{sub 2} atomic layer deposition using titanium tetrachloride and titanium tetraisopropoxide  

SciTech Connect

The surface chemistry for TiO{sub 2} atomic layer deposition (ALD) typically utilizes water or other oxidants that can oxidize underlying substrates such as magnetic disks or semiconductors. To avoid this oxidation, waterless or oxidant-free surface chemistry can be used that involves titanium halides and titanium alkoxides. In this study, waterless TiO{sub 2} ALD was accomplished using titanium tetrachloride (TiCl{sub 4}) and titanium tetraisopropoxide (TTIP). In situ transmission Fourier transform infrared (FTIR) studies were employed to study the surface species and the reactions during waterless TiO{sub 2} ALD. At low temperatures between 125 and 225??°C, the FTIR absorbance spectra revealed that the isopropoxide species remained on the surface after TTIP exposures. The TiCl{sub 4} exposures then removed the isopropoxide species and deposited additional titanium species. At high temperatures between 250 and 300??°C, the isopropoxide species were converted to hydroxyl species by ?-hydride elimination. The observation of propene gaseous reaction product by quadrupole mass spectrometry (QMS) confirmed the ?-hydride elimination reaction pathway. The TiCl{sub 4} exposures then easily reacted with the hydroxyl species. QMS studies also observed the 2-chloropropane and HCl gaseous reaction products and monitored the self-limiting nature of the TTIP reaction. Additional studies examined the waterless TiO{sub 2} ALD growth at low and high temperature. Quartz crystal microbalance measurements observed growth rates of ?3?ng/cm{sup 2} at a low temperature of 150??°C. Much higher growth rates of ?15?ng/cm{sup 2} were measured at a higher temperature of 250??°C under similar reaction conditions. X-ray reflectivity analysis measured a growth rate of 0.55 ± 0.05?Å/cycle at 250??°C. X-ray photoelectron depth-profile studies showed that the TiO{sub 2} films contained low Cl concentrations <1 at. %. This waterless TiO{sub 2} ALD process using TiCl{sub 4} and TTIP should be valuable to prevent substrate oxidation during TiO{sub 2} ALD on oxygen-sensitive substrates.

Anderson, Virginia R.; Cavanagh, Andrew S.; Abdulagatov, Aziz I. [Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 (United States); Gibbs, Zachary M. [Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424 (United States); George, Steven M., E-mail: Steven.George@Colorado.Edu [Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 and Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0427. (United States)

2014-01-15T23:59:59.000Z

290

TiO{sub 2} nanotube-based field effect transistors and their application as humidity sensors  

SciTech Connect

Highlights: Black-Right-Pointing-Pointer Individual TiO{sub 2} nanotubes fabricated by directly anodizing a Ti foil followed by ultrasonification. Black-Right-Pointing-Pointer Individual TiO{sub 2} nanotubes used to construct field effect transistors. Black-Right-Pointing-Pointer Electrical properties measured from the TiO{sub 2} nanotube-based field effect transistors. Black-Right-Pointing-Pointer Sensitive response of the TiO{sub 2} nanotube-based field effect transistors to water vapor. -- Abstract: TiO{sub 2} nanotubes are the building units of various devices of energy- and environment-related applications and the property studies of individual TiO{sub 2} nanotubes are important to understand and improve the performance of TiO{sub 2} nanotubes-based devices. Here we report the electrical property study of individual TiO{sub 2} nanotubes enabled by the construction of field effect transistors based on individual TiO{sub 2} nanotubes. It is found that individual TiO{sub 2} nanotubes exhibit typical n-type electrical conduction characteristics, with electron mobility of 6.9 Multiplication-Sign 10{sup -3} cm{sup 2}/V s at V{sub ds} = 1 V, and electron concentration of 2.8 Multiplication-Sign 10{sup 17} cm{sup -3}. Moreover, the on-off ratio of the TiO{sub 2} nanotube-based field effect transistors is as high as 10{sup 3}. Humidity sensing test shows the sensitive response of the individual TiO{sub 2} nanotubes to water vapor.

Liang, Fengxia [Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region (Hong Kong)] [Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region (Hong Kong); Luo, Lin-Bao [School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, Anhui (China)] [School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, Anhui (China); Tsang, Chun-Kwan; Zheng, Lingxia; Cheng, Hua [Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region (Hong Kong)] [Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region (Hong Kong); Li, Yang Yang, E-mail: yangli@cityu.edu.hk [Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region (Hong Kong)

2012-01-15T23:59:59.000Z

291

Atomistic simulation of dislocation core structures in ordered TiAl  

SciTech Connect

Interatomic potentials of the Embedded Atom type were used in the simulation of the dislocation core structures in TiAl. Different orientations of the dislocation line were simulated for the most commonly observed TiAl slip systems. Low-temperature dislocation behavior is interpreted in terms of ordinary dislocation motion. The effect of applied stress on the shape of the dislocation core and its mobility is examined as well. For the superdislocations several possible types of dissociations were studied.

Panova, J.; Farkas, D. [Virginia Polytechnic Inst., Blacksburg, VA (United States). Dept. of Materials Science and Engineering

1995-12-31T23:59:59.000Z

292

Investigation of the {gamma}-Ti(Cr,Al)2 phase at 800 C and 1000 C  

SciTech Connect

A section of the Ti-Al-Cr ternary system, centered around the {gamma}-TiCr{sub 2} phase was examined using five quenched bulk alloy samples and three diffusion couples. Due to the sluggishness of diffusion both at 800 and 1,000 C in the TiCr{sub 2} phase fields, the heat treatment produced a state of near-equilibrium in the samples rather than complete equilibrium, as desired. However, as previous studies have made use of similar, or shorter, processing schedules, the results of the present study should be considered as valid as the earlier works. As a confirmation of the phase composition obtained from the near-equilibrium bulk alloys, the results of a diffusion couple analysis, yielded similar compositions. It is clear, based on the above results that the {gamma}-TiCr{sub 2}, with a C14 crystal structure, does indeed extend into the Ti-Al-Cr ternary system as indicated by Suprunenko et al. The {gamma}-TiCr{sub 2} phase advances into the ternary as the b solid solution pulls away from the Ti-Cr binary system with decreasing temperature. Solubility into the ternary system is made possible by Al atoms substituting onto Cr sites, as is observed for the Al-Cr-Nb ternary system. Although the solubility of the {gamma}-TiCr{sub 2} phase extends from about 3--19at% Al at 1,000 C and from 6--24at% Al at 800 C, the exact limits of solubility are yet to be determined.

Jewett, T.J.; Dahms, M. [GKSS Research Centre, Geesthacht (Germany)] [GKSS Research Centre, Geesthacht (Germany)

1995-05-15T23:59:59.000Z

293

Optical rotation in RbTiOAsO4 (point group mm2) W. Kaminsky*, I  

E-Print Network (OSTI)

Optical rotation in RbTiOAsO4 (point group mm2) W. Kaminsky*, I , P. A. ThomasII and A. M. Glazer, UK Received March 5, 2001; accepted September 13, 2001 Abstract. Measurement of optical rotation in RbTiOAsO4 (RTA) with the tilter method resulted in an optical rotation of r12 ¼ þ17ð3� /mm

Kaminsky, Werner

294

[TiII] and [NiII] emission from the strontium filament of eta Carinae  

E-Print Network (OSTI)

We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of eta Carinae. To this purpose we employ multilevel models of the TiII and NiII systems which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for which no atomic data was previously available, we carry out ab initio calculations of radiative transition rates and electron impact excitation rate coefficients. It is found that the observed spectrum is consistent with the lines being excited in a mostly neutral region with an electron density of the order of $10^7$ cm$^{-3}$ and a temperature around 6000 K. In analyzing three observations with different slit orientations recorded between March~2000 and November~2001 we find line ratios that change among various observations, in a way consistent with changes of up to an order of magnitude in the strength of the continuum radiation field. These changes result from different samplings of the extended filament, due to the different slit orientations used for each observation, and yield clues on the spatial extent and optical depth of the filament. The observed emission indicates a large Ti/Ni abundance ratio relative to solar abundances. It is suggested that the observed high Ti/Ni ratio in gas is caused by dust-gas fractionation processes and does not reflect the absolute Ti/Ni ratio in the ejecta of \\etacar. We study the condensation chemistry of Ti, Ni and Fe within the filament and suggest that the observed gas phase overabundance of Ti

M. A. Bautista; H. Hartman; T. R. Gull; N. Smith; K. Lodders

2006-06-12T23:59:59.000Z

295

Heterogeneous catalytic wet peroxide oxidation of phenol over delaminated Fe–Ti-PILC employing microwave irradiation  

Science Journals Connector (OSTI)

Delaminated Fe-exchanged Ti-pillared interlayered montmorillonite (Fe–Ti-PILC) was prepared and its catalytic performance as heterogeneous catalyst in wet hydrogen peroxide oxidation of phenol employing microwave irradiation was firstly evaluated. The obtained results indicated that the application of the catalyst allows a comparatively high removal of COD and a total elimination of phenol under mild conditions, without obvious leaching of iron species. The introduction of microwave irradiation could greatly shorten the reaction time.

Jian Guo Mei; Shao Ming Yu; Jun Cheng

2004-01-01T23:59:59.000Z

296

Factors Affecting UV-Induced Superhydrophilic Conversion of a TiO2 Surface  

Science Journals Connector (OSTI)

Factors Affecting UV-Induced Superhydrophilic Conversion of a TiO2 Surface ... Particularly, the maximum extrema in spectral dependence of the efficiency of photoinduced hydrophilic conversion correspond to the energies of the first indirect and first direct electronic band-to-band transitions in TiO2. ... To estimate the efficiency of the photoinduced surface hydrophilic conversion, we used two parameters: initial rate of contact angle alteration and initial rate of surface energy alteration. ...

Alexei V. Emeline; Aida V. Rudakova; Munetoshi Sakai; Taketoshi Murakami; Akira Fujishima

2013-05-17T23:59:59.000Z

297

Microstructure and fracture toughness aspects of diffusion bonded interface between Ti and Al  

SciTech Connect

This study was undertaken to identify the microstructural characteristics of the intermetallic phases formed at the interface during the bonding process and determine the mechanical properties of Ti-Al dissimilar diffusion bonded joints, namely strength and fracture toughness. Furthermore, the effect of the intermetallic phases on the strength and fracture toughness of the joint was also determined. The effect of strength mis-match between Ti and Al on the fracture process will also be discussed. This investigation is the first phase of a larger project on the characterization of the intermetallics formed and their influence on strength and fracture toughness of the joints between TiAl-TiAl. A series of diffusion bonds of 25mm {times} 25 mm thick Ti bars were produced using aluminum foils of different thicknesses as interlayer. The bonded joints were tested to determine the fracture toughness properties of the interface formed and the effect of intermetallic phase formation on the fracture toughness was evaluated. Four-point bend specimens containing a crack introduced into the interface during the bonding process were tested to determine the diffusion-bonded interface fracture toughness. Tensile tests of the joints were also conducted to determine their strengths. The bonding conditions required to obtain a sound joint between Ti and Al were also evaluated.

Cam, G.; Dobi, D.; Kocak, M. [GKSS Research Center, Geesthacht (Germany); Heikinheimo, L.; Siren, M. [VTT Manufacturing Technology, Espoo (Finland)

1996-12-31T23:59:59.000Z

298

Electronic structure of lithium-doped anatase TiO{sub 2} prepared in ultrahigh vacuum  

SciTech Connect

Insertion of lithium in anatase TiO{sub 2}, giving Li{sub x}TiO{sub 2}, is performed under ultrahigh vacuum (UHV) conditions and studied using synchrotron radiation based electron spectroscopy. Core level photoemission spectra are directly compared to results obtained after electrochemical insertion, illustrating the usefulness of the UHV approach. The growth of a state of mainly Ti 3d character in the band gap is monitored and the amount of charge transferred from Li to the band gap state is quantified. The result that the Ti 3d level is occupied by 0.85{+-}0.10 electronic charge is in good agreement with theoretical predictions. Binding energy shifts of the core levels suggest that the population of the Ti 3d states does not follow a simple rigid band behavior. It is concluded that the formation of the Li-poor phase (x<2%) is associated with pinning of the Fermi level to the bottom of the conduction band. The Li-poor phase can therefore be envisaged as related to defects. Changes in the valence photoemission spectrum and O 1s x-ray absorption spectrum are interpreted in terms of a decreased O 2p-Ti 3d interaction upon Li insertion. Shifts in the sample work function are finally found to agree reasonably well with the measured cell voltage for electrochemical Li insertion into a nanoporous anatase film.

Richter, J.H.; Henningsson, A.; Karlsson, P.G.; Siegbahn, H.; Sandell, A. [Department of Physics, Uppsala University, P.O. Box 530, S-751 21 Uppsala (Sweden); Andersson, M.P.; Uvdal, P. [Chemical Physics, Department of Chemistry, Lund University, P.O. Box 124, S-221 00 Lund (Sweden)

2005-06-15T23:59:59.000Z

299

Dielectric property of NiTiO{sub 3} doped substituted ortho-chloropolyaniline composites  

SciTech Connect

Ortho-chloropolyaniline (OCP)-NiTiO{sub 3} composites have been synthesized via in-situ polymerization of ortho-chloroaniline with various weight percentages of NiTiO{sub 3.} Fourier Transform Infrared spectroscopic studies of Ortho-chloropolyaniline and its composites indicated the formation of composites as a result of Vander Waal's interaction between OCP and NiTiO{sub 3} particles. Surface morphology of OCP and OCP-NiTiO{sub 3} composites were studied using Scanning Electron Microscope (SEM). The SEM micrographs indicated a modified morphology after the composite formation. Dielectric properties and electric modulus of OCP and OCP-NiTiO{sub 3} composites have been investigated in the frequency range of 50 Hz – 5 MHz. It has been noticed that electrical resistance decreases with increase in weight percentage of NiTiO{sub 3} particles in polymer matrix as well as with applied frequency. The display of semicircular arcs in Cole-Cole plots indicates the formation of series resistor and capacitor in network causing a decrease in the relaxation time and as a result conductivity enhances in these composites. The facile and cost effective synthesis process and excellent dielectric and conductivity response of these materials makes them promising materials for practical applications.

Lakshmi, Mohana; Faisal, Muhammad [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India)] [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Roy, Aashish S. [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India)] [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India); Khasim, Syed, E-mail: syed.pes@gmail.com [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India) [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Department of Physics, University of Tabuk-71491 (Saudi Arabia); Sajjan, K. C. [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India)] [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India); Revanasiddappa, M. [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)] [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)

2013-11-15T23:59:59.000Z

300

Al–Ge–Ti: Phase equilibria and structural characterization of new ternary compounds  

Science Journals Connector (OSTI)

Abstract Phase equilibria of Al–Ge–Ti have been investigated using scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and differential thermal analysis (DTA). Partial isothermal sections at 400 °C, 520 °C and 1000 °C were obtained with focus on the titanium-poor part up to 50 at.% titanium. Three ternary compounds were found to exist. The compound Al3GeTi (?1) crystallizes in an own structure type (P4/nmm, tP10). Two structurally closely related compounds were found at the composition Al1?xGe1+xTi: ?2 (0.61 ? x ? 0.73), Al4Si5Zr3-type, I41/amd, tI24 and ? 2 ? (0.36 ? x ? 0.57), Si2Zr-type, Cmcm, oC12. DTA data were used to construct a ternary reaction scheme (Scheil diagram) up to approximately 1300 °C, a partial liquidus projection and two vertical sections, at 10 at.% Ti and at a constant Al:Ti ratio of 1:1. A total number of 12 ternary invariant reactions were identified.

Roland W. Bittner; Matthias Gürth; Liliana I. Duarte; Christian Leinenbach; Herta S. Effenberger; Klaus W. Richter

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Branching ratios for the beta decay of Na-21  

E-Print Network (OSTI)

We have measured the beta-decay branching ratio for the transition from Na-21 to the first excited state of Ne-21. A recently published test of the standard model, which was based on a measurement of the beta-nu correlation in the decay of Na-21...

Iacob, V. E.; Hardy, John C.; Gagliardi, Carl A.; Goodwin, J.; Nica, N.; Park, H. I.; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Zhai, Y.; Towner, I. S.

2006-01-01T23:59:59.000Z

302

Influence of Salt Purity on Na+ and Palmitic Acid Interactions  

E-Print Network (OSTI)

frequency generation (VSFG) spectroscopy. Ultrapure (UP) and ACS grade NaCl salts are used for aqueous the interfacial water structure. These results suggest that the alkali salt grade even after pretreatment to many chemical, biochemical, and atmospheric processes.1-8 Particularly, Na+ and K+ , as the two most

303

Topical Review Voltage Dependence of the Na/K Pump  

E-Print Network (OSTI)

or ``ion well'' hy- pothesis. There are only two ways that net transport can be voltage dependent. Either of the external Na+ and K+ bind- ing sites within the membrane field. This access channel or ``ion well produced by applying a blocking Key words: Na,K-ATPase -- Membrane potential -- Access channel -- Ion well

Gadsby, David

304

Comparison of corrosion resistances between Fe{sub 2}O{sub 3}-TiO{sub 2} artificial passivation film and passivation film on Fe-Ti alloy  

SciTech Connect

Fe{sub 2}O{sub 3}-TiO{sub 2} double-oxide films were formed on Pt substrates by low-pressure metallorganic chemical vapor deposition using iron acetylacetonate and tetraisopropoxytitanium as precursors and O{sub 2} as a reaction gas. Fe-Ti alloys were fabricated by an ion-beam sputter and an arc-melting process. The corrosion resistances of the Fe{sub 2}O{sub 3}-TiO{sub 2} films and the Fe-Ti alloys were examined in acid solutions. The thinning rate of the Fe{sub 2}O{sub 3}-TiO{sub 2} films in 5 M HCl decreased with an increase in the formation temperature. Likewise, the dissolution rate decreased with increasing titanium cationic fraction in the films. The films hardly dissolved at anodic potentials, while significant dissolution occurred at cathodic potentials in 1 M H{sub 2}SO{sub 4} owing to the selective reduction of iron oxide components in the films. Sputter-deposited Fe-Ti alloy films containing more than 39 atom % Ti and arc-melted Fe-Ti alloys containing more than 57 atom % Ti showed high corrosion resistance when passivated anodically in 5 M HCl. The dissolution rates of the Fe{sub 2}O{sub 3}-TiO{sub 2} films in 5 M HCl appear to be significantly smaller than those of the passive films on the Fe-Ti alloy films and the Fe-Ti alloys in the same solution.

Kim, H.; Akao, Noboru; Hara, Nobuyoshi; Sugimoto, Katsuhisa [Tohoku Univ., Sendai (Japan)

1998-08-01T23:59:59.000Z

305

Workforce Statistics - NA 20 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

20 | National Nuclear Security Administration 20 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Workforce Statistics - NA 20 Home > About Us > Our Operations > Management and Budget > Office of Civil Rights > Workforce Statistics > Workforce Statistics - NA 20 Workforce Statistics - NA 20 NA 20 FY12 NA 20 Semi Annual Report

306

Workforce Statistics - NA 40 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

40 | National Nuclear Security Administration 40 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Workforce Statistics - NA 40 Home > About Us > Our Operations > Management and Budget > Office of Civil Rights > Workforce Statistics > Workforce Statistics - NA 40 Workforce Statistics - NA 40 NA40 FY12 NA 40 Semi Annual Report

307

Workforce Statistics - NA 10 | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

0 | National Nuclear Security Administration 0 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Workforce Statistics - NA 10 Home > About Us > Our Operations > Management and Budget > Office of Civil Rights > Workforce Statistics > Workforce Statistics - NA 10 Workforce Statistics - NA 10 NA 10 FY12 NA 10 Semi Annual Report

308

Deformation of depleted uranium ? 0.78 Ti under shock compression to 11.0 GPa at room temperature  

Science Journals Connector (OSTI)

The present work on depleted uranium alloyed with 0.78% titanium by weight (i.e. U?0.8 Ti) describes the nature of deformation it undergoes when subjected to shock compression at room temperature. The principal results emerging out of the present work are: (1) The stress limits of elastic deformation are dependent on the thickness of U?0.8Ti. The stress limit decreases from over 3.0 GPa at the impact surface to 1.2 GPa at a depth of 9 mm in U?0.8 Ti; (2) The lower limit of the stress agrees with the static yield stress in U?0.8 Ti; (3) Above the elastic stress limit the deformation of U?0.8 Ti proceeds in a manner of the ideal plastic solid; and (4) The pressure derivative of Lame’s parameter of U?0.8 Ti is estimated to be 3.8.

Dattatraya P. Dandekar; Anthony G. Martin; John V. Kelley

1980-01-01T23:59:59.000Z

309

Assessment of the compositional influences on the toughness of TiCr{sub 2}-base laves phase alloys  

SciTech Connect

Systematic studies of alloys based on TiCr{sub 2} have been performed in order to improve the toughness of Laves phase intermetallics. The extent to which alloy compositions and annealing treatments influence the toughness was quantified by Vickers indentation. The single-phase Laves behavior was first established by studying stoichiometric and nonstoichiometric TiCr{sub 2}. Next, alloying effects were investigated with ternary Laves phases based on TiCr{sub 2}. Different microstructures of two-phase alloys consisting of (Ti,Cr)-bcc+TiCr{sub 2} were also examined. Various toughening theories based on vacancies, site-substitutions, crystal structure (C14, C36, or C15) stabilization, and the presence of a second phase were evaluated. The most effective factors improving the toughness of TiCr{sub 2} were determined, and toughening mechanisms are suggested.

Chen, K.C.; Allen, S.M.; Livingston, J.D.

1997-03-01T23:59:59.000Z

310

Otoczenie spoleczne i jego wplyw na wyniki ekonomiczne przedsibiorstwa na przykladzie instytucji nonprofit wiadczcej uslugi lecznicze i rehabilitacyjne.  

E-Print Network (OSTI)

_wyniki_ekonomiczne_przedsi_biorstwa_na_przyk_adzie_instytucji_nonpr ofit_wiadcz_cej_us_ugi_lecznicze_i_rehabilitacyjne_autorstwa_K_Szagdaja_A_Miks a/888478 Recenzja 2: N_wyniki_ekonomiczne_przedsi_biorstwa_na_przyk_adzie_instytucji_nonpr ofit_wiadcz_cej_us_ugi_lecznicze_i_rehabilitacyjne_autorstwa_K_Szagdaja_Recenzj a_2_N_Wenc_a/888477 hal

Paris-Sud XI, Université de

311

Photostable Self-Cleaning Cotton by a Copper(II) Porphyrin/TiO2 Visible-Light Photocatalytic System  

Science Journals Connector (OSTI)

Anatase TiO2-based self-cleaning textiles such as cotton, wool and polyester that show efficient photocatalytic properties under UV light have been developed. ... The TiO2 sol was applied to scoured cotton fabric through a dip-pad-dry-cure process. ... The importance of the binding states between the dye and TiO2 surface was discussed by comparison of the energy conversion efficiency in a dye-sensitized solar cell. ...

Shabana Afzal; Walid A. Daoud; Steven J. Langford

2013-03-06T23:59:59.000Z

312

Cr, N-Codoped TiO2 Mesoporous Microspheres for Li-ion Rechargeable Batteries with Enhanced Electrochemical Performance  

SciTech Connect

Cr,N-codoped TiO2 mesoporous microspheres synthesized using hydrothermal and subsequent nitridation treatment, exhibited higher solubility of nitrogen, and improved electrical conductivity than N-doped TiO2, as anode for Lithium-ion rechargeable batteries, which led to improving charge-discharge capacity at 0.1 C and twice higher rate capability compared to that of nitrogen-doped TiO2 mesoporous microsphere at 10 C

Bi, Zhonghe [ORNL] [ORNL; Paranthaman, Mariappan Parans [ORNL] [ORNL; Guo, Bingkun [ORNL] [ORNL; Unocic, Raymond R [ORNL] [ORNL; Meyer III, Harry M [ORNL] [ORNL; Bridges, Craig A [ORNL] [ORNL; Sun, Xiao-Guang [ORNL] [ORNL; Dai, Sheng [ORNL] [ORNL

2014-01-01T23:59:59.000Z

313

Combined Investigation of Water Sorption on TiO2 Rutile (110) Single Crystal Face: XPS vs. Periodic DFT  

E-Print Network (OSTI)

1 Combined Investigation of Water Sorption on TiO2 Rutile (110) Single Crystal Face: XPS vs(0)169157150; e-mail: roques@ipno.in2p3.fr Keywords: water, sorption, rutile TiO2, (110), XPS, DFT. Abstract XPS and periodic DFT calculations have been used to investigate water sorption on the TiO2 rutile (110) face. Two

Paris-Sud XI, Université de

314

On the 21Na(p,gamma)22Mg thermonuclear rate for 22Na production in novae  

E-Print Network (OSTI)

Classical novae are potential sources of gamma-rays, like the 1.275 MeV gamma emission following 22Na beta decay, that could be detected by appropriate instruments on board of future satellites like INTEGRAL. It has been shown that the production of 22Na by novae is affected by the uncertainty on the 21Na(p,gamma)22Mg rate and in particular by the unknown partial widths of the Ex = 5.714 MeV, J^pi = 2^+, 22Mg level. To reduce these uncertainties, we performed shell model calculations with the OXBASH code, compared the results with available spectroscopic data and calculated the missing partial widths. Finally, we discuss the influence of these results on the 21Na(p,gamma)22Mg reaction rate and 22Na synthesis.

Nadya A. Smirnova; Alain Coc

2000-08-16T23:59:59.000Z

315

Raman scattering induced by carbon vacancies in TiCx  

Science Journals Connector (OSTI)

Carbon vacancies in cubic TiCx induce a first-order Raman spectrum, the three independent components of which have been studied for x=0.97, 0.90, and 0.80. The spectra mimic, approximately, the calculated phonon density of states with some lowering of the upper edge of the gap between the acoustical- and optical-phonon regions and with some filling in of the valleys between prominent peaks for lower values of x. There is a tendency towards saturation of the integrated spectra with increasing vacancy concentration. Expressions are derived for the efficiency of light scattering from a disordered metal crystal. They agree with the corresponding results for transparent crystals when corrected for geometric and propagation effects. Analysis of the data using a Raman sum rule indicates that the mean-square polarizability derivative induced by carbon vacancies on carbon and titanium atoms is about the same; the large magnitudes observed here are evidence for resonant enhancement. The probabilities for clustering of vacancies are discussed, and it is concluded that clustering is so likely, even for x=0.97, that the experimental results cannot be interpreted as characteristic of isolated vacancies.

M. V. Klein, John A. Holy, and W. S. Williams

1978-02-15T23:59:59.000Z

316

Metallic glass alloys of Zr, Ti, Cu and Ni  

DOE Patents (OSTI)

At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c wherein x is from 0.1 to 0.3, y.cndot.c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b.

Lin, Xianghong (Pasadena, CA); Peker, Atakan (Pasadena, CA); Johnson, William L. (Pasadena, CA)

1997-01-01T23:59:59.000Z

317

On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing  

Science Journals Connector (OSTI)

Additive manufacturing provides an attractive processing method for nickel?titanium (NiTi) shape memory and pseudoelastic parts. In this paper, we show how the additive manufacturing process affects structural and functional properties of additively manufactured NiTi and how the process parameter set-up can be optimized to produce high quality NiTi parts and components. Comparisons of shape recovery due to shape memory and pseudoelasticity in additively manufactured and commercial NiTi exhibit promising potential for this innovative processing method.

Christoph Haberland; Mohammad Elahinia; Jason M Walker; Horst Meier; Jan Frenzel

2014-01-01T23:59:59.000Z

318

Micro- and nano-scale hollow TiO{sub 2} fibers by coaxial electrospinning: Preparation and gas sensing  

SciTech Connect

We report the preparation of micro- and nano-scale hollow TiO{sub 2} fibers using a coaxial electrospinning technique and their gas sensing properties in terms of CO. The diameter of hollow TiO{sub 2} fibers can be controlled from 200 nm to several micrometers by changing the viscosity of electrospinning solutions. Lower viscosities produce slim hollow nanofibers. In contrast, fat hollow microfibers are obtained in the case of higher viscosities. A simple mathematical expression is presented to predict the change in diameter of hollow TiO{sub 2} fibers as a function of viscosity. The successful control over the diameter of hollow TiO{sub 2} fibers is expected to bring extensive applications. To test a potential use of hollow TiO{sub 2} fibers in chemical gas sensors, their sensing properties to CO are investigated at room temperature. - Graphical abstract: Microstructures of as-prepared and calcined hollow TiO{sub 2} fibers prepared by the electrospinning technique with a coaxial needle. Dynamic response at various CO concentrations for the sensor fabricated with the hollow TiO{sub 2} fibers. Highlights: > Hollow TiO{sub 2} fibers were synthesized using a coaxial electrospinning technique. > Their diameter can be controlled by changing the viscosity of electrospinning solutions. > Lower viscosities produce slim hollow nanofibers. > In contrast, fat hollow microfibers are obtained in the case of higher viscosities. > Successful control over the diameter of hollow TiO{sub 2} fibers will bring extensive applications.

Zhang Jin; Choi, Sun-Woo [School of Materials Science and Engineering, Inha University, Incheon 402-751 (Korea, Republic of); Kim, Sang Sub, E-mail: sangsub@inha.ac.kr [School of Materials Science and Engineering, Inha University, Incheon 402-751 (Korea, Republic of)

2011-11-15T23:59:59.000Z

319

Effect of K and Ca on catalytic activity of Mn-CeO x /Ti-PILC  

Science Journals Connector (OSTI)

Mn-CeO x /Ti-pillared clay (PILC) is an attractive catalyst for selective catalytic... x at low temperature because of its low cost. The poison...

Boxiong Shen; Lidan Deng; Jianhong Chen

2013-08-01T23:59:59.000Z

320

The MBE growth and optical quality of BaTiO{sub 3} and SrTiO{sub 3} thin films on MgO  

SciTech Connect

High quality epitaxial BaTiO{sub 3} and SrTiO{sub 3} have been grown on MgO; stabilized at a one unit cell height; and grown to film thicknesses of 0.5--0.7 {mu}m. These relatively thick films remain adherent when thermally cycled between growth temperatures and room temperature, are crack free with high optical quality, and have both in-plane and out-of-plane X-ray rocking curves of 0.3--0.5{degree}. These films have been grown using molecular beam epitaxy (MBE) methods starting with the TiO{sub 2} layer of the perovskite structure. The TiO{sub 2}-layer/MgO interface uniquely satisfies electrostatic requirements for perovskite heteroepitaxy and provides the template structure that leads to the high quality films that are obtained. Wavelength dependence of optical loss has been characterized between 475 nm and 705 nm with loss coefficients < l dB/cm being obtained at the He-Ne wavelength.

McKee, R.A.; Specht, E.D.; Alexander, K.B. [Oak Ridge National Lab., TN (United States); Walker, F.J. [Tennessee Univ., Knoxville, TN (United States)

1994-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS:  

NLE Websites -- All DOE Office Websites (Extended Search)

Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: products, effect of UV irradiation, water and coadsorbed K+ Title Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: products, effect of UV irradiation, water and coadsorbed K+ Publication Type Journal Article Year of Publication 2013 Authors Rosseler, Olivier, Mohamad Sleiman, Nahuel V. Montesinos, Andrey Shavorskiy, Valerie Keller, Nicolas Keller, Marta I. Litter, Hendrik Bluhm, Miquel Salmeron, and Hugo Destaillats Journal J. Phys. Chem. Lett. Volume 4 Start Page 536 Issue 3 Pagination 536-541 Date Published 01/2013 Abstract Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressure XPS was used to study surface and gas-phase species formed during adsorption of NO2 on TiO2 and subsequent UV irradiation at λ = 365 nm. It is shown here that NO3-, adsorbed on TiO2 as a byproduct of NO2 disproportionation, was quantitatively converted to surface NO2 and other reduced nitrogenated species under UV irradiation in the absence of moisture. When water vapor was present, a faster NO3- conversion occurred, leading to a net loss of surface-bound nitrogenated species. Strongly adsorbed NO3- in the vicinity of coadsorbed K+ cations was stable under UV light, leading to an efficient capture of nitrogenated compounds.

322

EA-372 GDF Suez Energy Marketing NA, Inc. | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2 GDF Suez Energy Marketing NA, Inc. EA-372 GDF Suez Energy Marketing NA, Inc. Order authorizing GDF Suez Energy Marketing NA, Inc. to export electric energy to Canada EA-372 GDF...

323

Impact of point defects on electronic structure in Y2Ti2O7  

SciTech Connect

With many technologies and applications downscaling to nanometer dimensions, the influence of single point defects on electronic structure has shown increasingly profound impact on optical and electrical properties, and advancing fundamental understanding is critical to defect engineering and control of materials properties. In the present study, first-principles calculations based on density functional theory (DFT) are carried out to study the effects of Ti point defects on the electronic structure of Y2Ti2O7. In the literature, it has been demonstrated that conventional DFT tends to produce delocalized holes and electrons in defective oxide materials due to insufficient cancellation of the self-interaction energy and underestimation of the band gap, which results in an incorrect description of the electronic structure of the system. In an effort to better understand the accuracy of DFT in describing the behavior of Y2Ti2O7 with point defects, the calculated results obtained from using DFT and DFT+U methods are compared, including the geometrical distortion, the localization of the defect states and the position of the defect levels in the band gap. Using DFT, distorted geometries around the Ti vacancy and interstitial are found, along with localized oxygen holes and Ti electrons, both of which compare well with the DFT+U results, suggesting that the conventional DFT can be used to describe the localization of the Ti defects in Y2Ti2O7. One major difference in the DFT and DFT+U calculations is the energy position of the defect levels, for which DFT+U results in the states positioned deep in the band gap. Since the DFT+U method suffers from the dependence of the results on the empirical parameter U and no experimental results on the energy position of the defect states are available to tune this U value, care must be taken in applying DFT+U to electronic structure calculations of Y2Ti2O7 with point defects. Based on the DFT method, the most preferred charge state is determined by the formation energies for charged point defects. Moving the Fermi level across the band gap has slight effects on the charge state, and the Ti vacancy and interstitial are found to be in -4 and +4 charge states, respectively.

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

2012-01-01T23:59:59.000Z

324

Impact of Point Defects on Electronic Structure in Y?Ti?O?  

SciTech Connect

With many technologies and applications downscaling to nanometer dimensions, the influence of single point defects on electronic structure has shown an increasingly profound impact on optical and electrical properties, and advancing fundamental understanding is critical to defect engineering and control of materials properties. In the present study, first-principles calculations based on density functional theory (DFT) are carried out to study the effects of Ti point defects on the electronic structure of Y?Ti?O?. In the literature, it has been demonstrated that conventional DFT tends to produce delocalized holes and electrons in defective oxide materials due to insufficient cancellation of the self-interaction energy and underestimation of the band gap, which results in an incorrect description of the electronic structure of the system. In an effort to better understand the accuracy of DFT in describing the behavior of Y?Ti?O? with point defects, the calculated results obtained from DFT and DFT+U methods are compared, including the geometrical distortion, the localization of the defect states and the position of the defect levels in the band gap. Using DFT, distorted geometries around the Ti vacancy and interstitial are found, along with localized oxygen holes and Ti electrons, both of which compare well with the DFT+U results, suggesting that the conventional DFT can be used to describe the localization of the Ti defects in Y?Ti?O?. One major difference in the DFT and DFT+U calculations is the energy position of the defect levels, for which DFT+U results in the states positioned deep in the band gap. Since the DFT+U method suffers from the dependence of the results on the empirical parameter U and no experimental results on the energy position of the defect states are available to tune this U value, care must be taken in applying DFT+U to electronic structure calculations of Y?Ti?O? with point defects. Based on the DFT method, the most preferred charge state is determined by the formation energies for charged point defects. Moving the Fermi level across the band gap has slight effects on the charge state, and the Ti vacancy and interstitial are found to be in 24 and +4 charge states, respectively.

Xiao, Haiyan Y.; Zhang, Yanwen; Weber, William J.

2012-06-13T23:59:59.000Z

325

OH Group Dynamics of 1, 3-propanediol on TiO2(110)  

SciTech Connect

Variable-temperature scanning tunneling microscopy and dispersion-corrected density functional theory were employed to study the interaction of 1,3 propanediol with reduced TiO2(110) surfaces. We find that at 300 K, 1,3-propanediol molecules dissociate via O-H bond scission of one of the OH groups on bridge-bonded oxygen (Ob) vacancy (VO) defects forming pairs of monoalkoxide (Ob-(CH2)3-OH) and bridge-bonded bonded hydroxyl (HOb) species. The OH group of the monoalkoxide species is bound to the adjacent 5-coordinated Ti4+ (Ti5c) sites. The Ob-(CH2)3-OH species are observed to rotate around their Ob anchor, switching the position of the OH between the two adjacent Ti5c rows. The rotating species are found to assist the cross-Ob row HOb hydrogen transfer. The OH group of the monoalkoxide species is further observed to dissociate forming bidentate type dioxo (Ob-(CH2)3-"O" _(?"Ti" ?_"5c" )) species and an additional HOb. The reversible interconversion between the mono- and di-oxo species illustrates a formation of the equilibrium between these conjugate acid/base pairs.

Zhang, Zhenrong; Yoon, Yeohoon; Lin, Xiao; Acharya, Danda P.; Kay, Bruce D.; Rousseau, Roger J.; Dohnalek, Zdenek

2012-11-15T23:59:59.000Z

326

Preparation and properties of Al-PILC supported SO42?/TiO2 superacid catalyst  

Science Journals Connector (OSTI)

SO42?/TiO2/Al-pillared clay (ST/Al-PILC) superacid catalyst was prepared by loading active component SO42?/TiO2 on Al-pillared clay. The texture structure properties of the catalyst were studied by means of X-ray powder diffraction and the adsorption of N2. Acidity properties of the catalyst were tested by Hammett indicator method and FT-IR spectra of absorbed pyridine technique. The characterization results indicated that Al-PILC carrier could inhibit the formation of anatase TiO2 and the transformation of anatase TiO2 into rutile TiO2. ST/Al-PILC catalyst possesses both Lewis and Brönsted acid sites, and the number of acid sites on ST/Al-PILC is much larger than that on Al-PILC carrier, but its acid strength is lower than that of ST. Experimental results show that ST/Al-PILC is an effective catalyst for esterification of n-pentanol with benzoic acid.

Yue-Xiu Jiang; Xiao-Mei Chen; Yun-Fen Mo; Zhang-Fa Tong

2004-01-01T23:59:59.000Z

327

Deformation and fracture behavior of composite structured Ti-Nb-Al-Co(-Ni) alloys  

SciTech Connect

Tensile ductility of the Ti-based composites, which consist of a ?-Ti phase surrounded by ultrafine structured intermetallics, is tunable through the control of intermetallics. The two Ti-based alloys studied exhibit similar compressive yield strength (about 1000?MPa) and strain (about 35%–40%) but show a distinct difference in their tensile plasticity. The alloy Ti{sub 71.8}Nb{sub 14.1}Ni{sub 7.4}Al{sub 6.7} fractures at the yield stress while the alloy Ti{sub 71.8}Nb{sub 14.1}Co{sub 7.4}Al{sub 6.7} exhibits about 4.5% of tensile plastic deformation. To clarify the effect of microstructure on the deformation behavior of these alloys, tensile tests were carried out in the scanning electron microscope. It is shown that the distribution as well as the type of intermetallics affects the tensile ductility of the alloys.

Okulov, I. V., E-mail: i.okulov@ifw-dresden.de; Marr, T.; Schultz, L.; Eckert, J. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01062 Dresden (Germany); Kühn, U. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Freudenberger, J. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Institut für Werkstoffwissenschaft, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Str. 5, D-09599 Freiberg (Germany); Oertel, C.-G.; Skrotzki, W. [Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden (Germany)

2014-02-17T23:59:59.000Z

328

First-principles study on negative thermal expansion of PbTiO{sub 3}  

SciTech Connect

It is well known that perovskite-type PbTiO{sub 3} behaves negative thermal expansion in a wide temperature range from room temperature to Curie temperature (763?K). The present study reports the first-principles study of the anisotropic thermal expansion of PbTiO{sub 3}, in the framework of the density-functional theory and the density-functional perturbation theory. The curve of temperature dependence of the unit cell volume is presented from 20 to 520?K through the calculation of the minimum of total free energy at each temperature point. The negative thermal expansion of PbTiO{sub 3} is calculated without empirical parameters. Furthermore, the distinctive thermodynamic act of PbTiO{sub 3} from expanding to contracting at tetragonal phase is reproduced. The ab-initio calculations reveal that this unique appearance depends on the phonon vibration. The dynamical contributions of various atoms are also calculated to account for the disparate role of Pb-O and Ti-O bond.

Wang, Fangfang; Chen, Jun; Xing, Xianran, E-mail: xing@ustb.edu.cn [Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083 (China)] [Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083 (China); Xie, Ying; Fu, Honggang [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (China)

2013-11-25T23:59:59.000Z

329

Study of new states in visible light active W, N co-doped TiO{sub 2} photo catalyst  

SciTech Connect

Highlights: ? Visible light efficient W, N co-doped TiO{sub 2} photo catalysts are prepared by sol–gel. ? Oxygen vacancies are detected in the form of new linkages as N-Ti-O, N-W-O, Ti-O-N and W-O-N. ? W, N co-doped titania has new energy states which narrows the band gap effectively. ? Oxygen vacancies are proved to be the cause for high photo catalytic activity. ? W and N co-doping plays the major role to make the composite thermally stable. -- Abstract: The visible light efficient W, N co-doped TiO{sub 2} photo catalysts are prepared by sol–gel method. New linkages of N, W and O are formed as N-Ti-O, N-W-O, Ti-O-N and W-O-N. Electron paramagnetic resonance illustrates the presence of oxygen vacancies in W, N co-doped TiO{sub 2} acting as trapping agencies for electrons to produce active species. X-ray photoelectron spectroscopy confirms the presence of new energy states. New linkages and oxygen vacancies are proved to be the main cause for the improved photo catalytic performances. W, N co-doped TiO{sub 2} has new energy states which narrow the band gap effectively. W, N co-doped TiO{sub 2} is thermally stable and retains its anatase phase up to 900 °C. 4.5% W, N co-doped TiO{sub 2} showed superior activity for the degradation of Rhodamine B and 2,4-dichlorophenol as compared to pure titania, Degussa P-25, traditional N-doped TiO{sub 2} and pure WO{sub 3}.

Sajjad, Ahmed Khan Leghari [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China)] [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China); Shamaila, Sajjad, E-mail: shalisajjad@yahoo.com [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China)] [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China); Zhang, Jinlong [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China)] [Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 (China)

2012-11-15T23:59:59.000Z

330

E-Print Network 3.0 - anseniformes ocorrido na Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

de maior intensidade e freqncia esto na periferia das placas tectnicas. O Brasil se situa numa... posio privilegiada, ou seja, na poro central da Placa...

331

E-Print Network 3.0 - auxilio na descoberta Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Na ltima dcada, o Projeto Peixes de Bonito junto com vrias... universidades do Brasil e do exterior revelaram numerosos achados. Os mais recentes aconteceram na Expedio...

332

E-Print Network 3.0 - aceleradores na ciencia Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

na ciencia Search Powered by Explorit Topic List Advanced Search Sample search results for: aceleradores na ciencia Page: << < 1 2 3 4 5 > >> 1 ARTIGO INTERNET Aceleradores...

333

Low-Frequency Dielectric Constant of LiF, NaF, NaCl, NaBr, KCl, and KBr by the Method of Substitution  

Science Journals Connector (OSTI)

The 1000-Hz 300°K dielectric constants of some alkali halides were measured to an accuracy of 0.01% by the method of substitution. Reproducibly different values for various crystals of the same type were obtained which varied beyond the experimental error. The ranges of results for various crystals of each type measured are LiF, 9.0355-9.0360; NaF, 5.0719-5.0722; NaCl, 5.8940-5.8956; NaBr, 6.3957-6.3974; KCl, 4.8112-4.8182; and KBr, 4.8735-4.8762. The spread for each type of crystal is thought to be attributable to random trace impurities. The numbers are discussed in the light of past values.

Carl Andeen; John Fontanella; Donald Schuele

1970-12-15T23:59:59.000Z

334

Clarification by TEM and SIMS of abnormal Ti depth distribution in chemical solution-deposited SrTiO3/La0.5Sr0.5CoO3  

Science Journals Connector (OSTI)

A chemical solution-deposited multilayer system of SrTiO3 ("STO")/La0.5Sr0.5CoO3 ("LSCO") on a platinized wafer with a layer sequence Pt/TiO2/SiO2.../Si(bulk) has been investigated by dynamic SIMS (secondary ion...

C. Pollak; H. Hutter; P. Warbichler…

2001-09-01T23:59:59.000Z

335

Active Oxygen on Au/TiO2 Catalysts DOI: 10.1002/anie.201102062 Active oxygen on a Au/TiO2 catalyst Formation, stability and CO  

E-Print Network (OSTI)

1 Active Oxygen on Au/TiO2 Catalysts DOI: 10.1002/anie.201102062 Active oxygen on a Au/TiO2 are the activation of molecular oxygen, the active site for this reaction step, and the nature of the catalytically active oxygen species present under working conditions.[3;9-15] Stiehl et al. had shown that molecularly

Pfeifer, Holger

336

ON RACK COHOMOLOGY P. ETINGOF & M. GRA"NA  

E-Print Network (OSTI)

ON RACK COHOMOLOGY P. ETINGOF & M. GRA"NA Abstract.We prove that the lower bounds for Betti numbers of the rack, qu-theoretical interpretation of t* *he second cohomology group for racks. 1.Introduction

Graña, Matías

337

High-Resolution Soft X-Ray Spectral Analysis in the CK Region of Titanium Carbide (TiC) using the DV-X alpha Molecular Orbital Method  

E-Print Network (OSTI)

in the CK Region of Titanium Carbide (TiC) using the DV-X?USA Keyword titanium carbide, soft X-ray spectroscopy,C K region of titanium carbide (TiC). The spectral profiles

Shimomura, Kenta

2010-01-01T23:59:59.000Z

338

High-energy conversion efficiency of transient stimulated Raman scattering in methane pumped by the fundamental of a femtosecond Ti:sapphire laser  

Science Journals Connector (OSTI)

We studied stimulated Raman scattering in pressurized methane in the highly transient regime pumped by 140-fs 0.7-mJ pulses from a Ti:sapphire (Ti:S) laser tuned at 750 nm....

Koprinkov, I G; Suda, Akira; Wang, Pengqian; Midorikawa, Katsumi

1999-01-01T23:59:59.000Z

339

Surface-polishing process for NaI crystals  

SciTech Connect

Darkening of large arrays of NaI used in high energy physics experiments at SLAC has prompted an investigation of methods for annealing radiation damage. As part of this research, it has been necessary to repolish the flat faces of the NaI crystals. The final polishing parameters are given in this document as well as an indication of some techniques which did not work.

Francis, J.

1982-09-01T23:59:59.000Z

340

Chemical State and Local Structure around Titanium Atoms in NaAlH4 Doped with TiCl3 Using X-ray Absorption Spectroscopy  

Science Journals Connector (OSTI)

Financial support by the “Forschungsallianz Brennstoffzelle Baden-Württemberg” is gratefully acknowledged. ...

Aline Léon; Oliver Kircher; Jörg Rothe; Maximilian Fichtner

2004-09-29T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Synthesis, characterization, and ion exchange properties of a sodium nonatitanate, Na4Ti9O20.xH2O  

E-Print Network (OSTI)

During the Cold War, the Hanford Weapons Site in Richland, Washington, produced weapons grade plutonium which first needed to be separated from the other products using the PUREX process (plutonium and uranium extraction). As a by product...

Graziano, Gina Marie

1998-01-01T23:59:59.000Z

342

Direct Application of TiBor Coatings Projects (4583), 3/12/2012  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Direct Application of Ti8or Coatings Projects (4583) Direct Application of Ti8or Coatings Projects (4583) Program or Field Office: Y-12 Site Office Location(s) (City/County/State): Oak Ridge, Anderson County, Tennessee Proposed Action Description: Submit by E-mail The scope of this Cooperative Research and Development (CRADA) is to demonstrate the performance of Ti8or coatings on steel tools, specifically farming tools such as plows, which are normally subjected to significant wear during springtime use. Categorical Exclusion(s) Applied: 83.6 - Small-scale research and development, laboratory operations, and pilot projects 83.11 - Outdoor tests and experiments on materials and equipment components For the complete DOE National Environmental Policy Act regulations regarding categorical exclusions, including the full text of each

343

Acetone-Assisted Oxygen Vacancy Diffusion on TiO2(110)  

SciTech Connect

We have studied the dynamic relationship between acetone and bridge-bonded oxygen (Ob) vacancy (VO) defect sites on the TiO2(110)-1 × 1 surface using scanning tunneling microscopy (STM) and density function theory (DFT) calculations. We report an adsorbate-assisted VO diffusion mechanism. The STM images taken at 300 K show that acetone preferably adsorbs on the VO site and is mobile. The sequential isothermal STM images directly show that the mobile acetone effectively migrates the position of VO by a combination of two acetone diffusion channels: one is the diffusion along the Ob row and moving as an alkyl group, which heals the initial VO; another is the diffusion from the Ob row to the fivecoordinated Ti4+ row and then moving along the Ti4+ row as an acetone, which leaves a VO behind. The calculated acetone diffusion barriers for the two channels are comparable and agree with experimental results.

Xia, Yaobiao; Zhang, Bo; Ye, Jingyun; Ge, Qingfeng; Zhang, Zhenrong

2012-10-18T23:59:59.000Z

344

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

SciTech Connect

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

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

2014-03-24T23:59:59.000Z

345

S-PRIME/TI-SNPS program activities in FY94 critical components testing  

SciTech Connect

A conceptual design for a 40-kWe thermionic space nuclear power system (TI-SNPS) known as the S-PRIME system is being developed by Rockwell and its subcontractors for the U.S. Department of Energy (DOE), United States Air Force (USAF), and Ballistic Missile Defense Organization (BMDO) under the TI-SNPS Program. Phase 1 of this program includes developing a conceptual design of a 5- to 40-kWe range TI-SNPS and validating key technologies that support the design. All key technologies for the S-PRIME design have been identified along with six critical component demonstrations, which will be used to validate the S-PRIME design features. {copyright}American Institute of Physics 1995

Brown, C. [U.S. Department of Energy, Office of Nuclear Energy Space Reactor Power Systems Division, 19901 Germantown Road, Germantown, Maryland 20874 (United States); Dale Rogers, R.; Determan, W.R. [Rockwell International Corporation, Rocketdyne Division, 6633 Canoga Avenue, Canoga Park, California 91303-7922 (United States); Van Hagan, T. [General Atomics, Post Office Box 85608, San Diego, California 92186-9784 (United States)

1995-01-20T23:59:59.000Z

346

Fracture criterion for predicting surface cracking of Ti40 alloy in hot forming processes  

Science Journals Connector (OSTI)

Hot compression tests were conducted on Ti40 burn resistant titanium alloy in the temperature range of 900–1 100 °C and strain rate range of 0.01–10 s?1 to investigate its fracture behavior and critical fracture conditions in hot forming. It was observed that the failure of Ti40 alloy is attributed to longitudinal surface cracking due to severe oxidation of element V and the secondary tensile stresses. The critical fracture strain increases with increasing temperature and decreasing strain rate. From these observations and parallel FEM simulations, it was concluded that the critical fracture strain is a function of a single argument Zener-Hollomon parameter, and there is a linear relationship between them. An Oyane criterion successfully predicted the location of crack initiation. The critical fracture values also exhibit a liner relationship with lnZ. Based on these results, a new fracture criterion of Ti40 alloy based on Zener-Hollomon parameter was established.

Xue-min ZHANG; Wei-dong ZENG; Ying SHU; Yi-gang ZHOU; Yong-qing ZHAO; Huan WU; Han-qing YU

2009-01-01T23:59:59.000Z

347

Effect of Reactive Sputtering Parameters on TiAlN Nanocoating Structure and Morphology  

SciTech Connect

The effect of substrate bias and nitrogen flow rate on the TiAlN nanocoating structure and morphology has been investigated by using reactive unbalance DC magnetron sputtering. TiAlN nanocoating was deposited on the tungsten carbide insert tool and the structure and morphology were characterized by using XRD and AFM, respectively. The substrate bias was varied between 0 to -221 V and the nitrogen flow rate was varied between 30 to 72 sccm. The results showed that the structure of TiAlN nanocoating consisted of mainly (111) and (200) plane. The structure was significatly influenced by substrate bias in promoting finer crystal size and increased crystal plane spacing while the rms roughness of nanocoating was influenced by substrate bias and nitrogen flow rate.

Budi, Esmar [Jurusan Fisika FMIPA Universitas Negeri Jakarta Jl. Pemuda No. 10 Rawamangun Jakarta 13220 (Indonesia); Razali, M. Mohd.; Nizam, A. R. Md. [Faculty of Manufacturing Engineering Universiti Teknikal Malaysia Melaka (UTeM) Karung Berkunci No 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia)

2010-10-24T23:59:59.000Z

348

NbTiN Based SIS Multilayer Structures for SRF Applications  

SciTech Connect

For the past three decades, bulk niobium has been the material of choice for SRF cavities applications. RF cavity performance is now approaching the theoretical limit for bulk niobium. For further improvement of RF cavity performance for future accelerator projects, Superconductor ? Insulator - Superconductor (SIS) multilayer structures (as recently proposed by Alex Gurevich) present the theoretical prospect to reach RF performance beyond bulk Nb, using thinly layered higher-Tc superconductors with enhanced Hc1. Jefferson Lab (JLab) is pursuing this approach with the development of NbTiN and AlN based multilayer SIS structures. This paper presents the results on the characteristics of NbTiN films and the first RF measurements on NbTiN-based multilayer structure on thick Nb films.

Valente, Anne-marie; Eremeev, Grigory; Phillips, H.; Reece, Charles; Spradlin, Joshua; Yang, Qiguang; Lukaszew, Rosa

2013-09-01T23:59:59.000Z

349

Predicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach  

E-Print Network (OSTI)

stable. This is equivalent to a global optimization problem of a biobjective function, i.e., total energyPredicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach Hou as a novel global optimization algorithm to predict new polymorphs of bulk TiO2 with better optical

Gong, Xingao

350

Stoichiometric, nonstoichiometric, and locally nonstoichiometric SrTiO{sub 3} films grown by molecular beam epitaxy  

SciTech Connect

SrTiO{sub 3} films were grown by reactive molecular beam epitaxy to have varying degrees of both global and local cationic nonstoichiometries (with stoichiometry defined as a 1:1 ratio of Sr:Ti). Slight global excesses of Sr and Ti resulted in two-fold reconstructions in the reflection high-energy electron diffraction patterns along the [110] and [100] azimuths, respectively. Larger global nonstoichiometries (2:1 and 1:2 ratios) were also accommodated into the film's crystalline structure and affected the long-range crystalline order as observed in the x-ray diffraction patterns, both of which were related to the parent perovskite pattern. Local nonstoichiometries were introduced by depositing multiple monolayers (MLs) (from 2 to 33) of SrO and TiO{sub 2} in an alternating fashion, while maintaining the global SrTiO{sub 3} stoichiometry. These layered structures of SrO and TiO{sub 2} blocks inter-reacted during growth to form highly crystalline epitaxial SrTiO{sub 3}. Films grown in this manner with blocks thicker than 8 MLs were fully relaxed and, when the block thicknesses ranged between 8 and 10 MLs, the full widths at half maxima of 2{theta} peaks were narrower than the standard SrTiO{sub 3} films having blocks 1 ML thick.

Fisher, P.; Du, H.; Skowronski, M.; Salvador, P. A. [Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); Maksimov, O. [Electro-Optics Center, Pennsylvania State University, Freeport, Pennsylvania 16229 (United States); Weng, X. [Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)

2008-01-01T23:59:59.000Z

351

Application of FIB microsampling technique to long-period ordered TiAl single crystal with composition gradient  

Science Journals Connector (OSTI)

......and 3 Department of Materials Science and Engineering...for Electronics and Materials, Kyushu University...Transmission Specimen Handling Titanium chemistry...for Electronics and Materials and 2 Art, Science...In a Ti-Al phase diagram, a g-TiAl intermetallic......

Satoshi Hata; Kohjiro Shiraishi; Masaru Itakura; Noriyuki Kuwano; Takayoshi Nakano; Yukichi Umakoshi

2004-10-01T23:59:59.000Z

352

Improved Lithium Ion Behavior Properties of TiO2@Graphitic-like Carbon Core@Shell Nanostructure  

E-Print Network (OSTI)

Improved Lithium Ion Behavior Properties of TiO2@Graphitic-like Carbon Core@Shell Nanostructure Min Intercalation Electrochemistry Capacitance Lithium Ion batteries A B S T R A C T We demonstrate TiO2@graphitic on the electrode surface and enhanced lithium ion intercalation, leading to lower charge transfer resistance

Cao, Guozhong

353

Deposition of TiO2 thin films by atmospheric plasma post-discharge assisted injection MOCVD  

E-Print Network (OSTI)

Deposition of TiO2 thin films by atmospheric plasma post-discharge assisted injection MOCVD C Keywords : Injection MOCVD, Atmospheric Plasma, titanium oxide, anatase, PECVD Abstract TiO2 thin films combines remote Atmospheric Pressure (AP) Plasma with Pulsed Injection Metallorganic Chemical Vapour

Boyer, Edmond

354

IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 10, NO. 3, MAY 2011 499 TiSi2 Nanocrystal Metal Oxide Semiconductor Field  

E-Print Network (OSTI)

IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 10, NO. 3, MAY 2011 499 TiSi2 Nanocrystal Metal Oxide memory window, faster writing and erasing, and longer retention lifetime as a result of the metallic property of the silicide NCs. Due to thermally stable, CMOS compatible properties, TiSi2 NCs are highly

Yang, Zheng

355

"ATLAS.ti 101" November 30, 2011 Dr. Stuart Shuman Qualitative Data Analysis Program University of Massachusetts Amherst  

E-Print Network (OSTI)

Page 1 "ATLAS.ti 101" November 30, 2011 Dr. Stuart Shuman ­ Qualitative Data Analysis Program University of Massachusetts Amherst "ATLAS.ti 101: A Primer" Dr. Stuart W. Shulman Director, QDAPUMass. According to ATLAS: "This file is the `gatekeeper' that controls access to the data source. Every user

Massachusetts at Amherst, University of

356

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

E-Print Network (OSTI)

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

Zheng, Yufeng

357

First-principles study of hydrogen storage on Ti-decorated B{sub 2}C sheet  

SciTech Connect

The hydrogen storage capacity of Ti decorated B{sub 2}C sheet has been investigated by first-principles plane-wave calculation. It is revealed that a single Ti atom adsorbed on the B{sub 2}C sheet can strongly bind up to four hydrogen molecules. The adsorption energy is in the range of -0.36--0.82 eV/H{sub 2}, which is suitable for ambient temperature hydrogen storage. Considering the fact that Ti can be loaded on both sides of B{sub 2}C sheet, corresponding gravimetric storage capacity of Ti/B{sub 2}C system was also calculated and it can reach to about 7.0 wt%, exceeding the minimum requirement of 6.0 wt% for applications. - Graphical abstract: We investigated the hydrogen storage capacity of Ti decorated B{sub 2}C sheet. The most favorable adsorption geometries for every number of hydrogen molecules on Ti/B{sub 2}C complex are given in the figure. Highlights: Black-Right-Pointing-Pointer Ti decorated B{sub 2}C sheet serve as hydrogen storage medium. Black-Right-Pointing-Pointer A single Ti atom adsorbed on the B{sub 2}C sheet can strongly bind up to four hydrogen molecules. Black-Right-Pointing-Pointer The adsorption energy is in moderate range of -0.36--0.82 eV/H{sub 2}.

Guo, Y.H.; Xu, B.; Xia, Y.D.; Yin, J. [Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China); Liu, Z.G., E-mail: liuzg@nju.edu.cn [Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)

2012-06-15T23:59:59.000Z

358

Adsorption of water and ammonia on TiO2-anatase cluster models Isik Onal a,*, Sezen Soyer a  

E-Print Network (OSTI)

to the surface properties and the adsorption reactions of titanium dioxide-anatase surface. Lin and Bai [3 reserved. Keywords: TiO2; Anatase; Adsorption; Water; Ammonia; DFT 1. Introduction Titanium oxides are usedAdsorption of water and ammonia on TiO2-anatase cluster models Isik Onal a,*, Sezen Soyer a , Selim

Senkan, Selim M.

359

Effect of thin Mo2C layer on thermal stability of Si/SiO2/Ti/Cu system  

Science Journals Connector (OSTI)

The effect of introducing a thin Mo2C (30 nm) layer between Ti and Cu on the thermal stability of Si/SiO2/Ti/Cu system was studied using four-point probe (FPP), scanning electron microscopy (SEM), energy-dispersi...

C. C. Tripathi; Mukesh Kumar; Dinesh Kumar

2011-12-01T23:59:59.000Z

360

Geometric and Electronic Properties of Sn-Doped TiO2 from First-Principles Calculations  

Science Journals Connector (OSTI)

Geometric and Electronic Properties of Sn-Doped TiO2 from First-Principles Calculations ... Finer k-point sets 3 × 3 × 4 and 3 × 5 × 4 were employed for calculating the electronic properties of doped rutile TiO2. ... This viewpoint is confirmed by the subsequent calculated formation energy. ...

Run Long; Ying Dai; Baibiao Huang

2008-12-17T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Enhanced ethanol sensing properties of TiO2/ZnO core–shell nanorod sensors  

Science Journals Connector (OSTI)

TiO2-core/ZnO-shell nanorods were synthesized using a two-step process: the synthesis of TiO2 nanorods using a hydrothermal method followed by atomic layer deposition of ZnO. The mean diameter and length of the n...

Sunghoon Park; Soyeon An; Hyunsung Ko; Sangmin Lee; Hyoun Woo Kim…

2014-06-01T23:59:59.000Z

362

Nuclear Double Resonance Study of Na First-Order Quadrupole Splittings in a NaF-LiF Mixed Crystal  

Science Journals Connector (OSTI)

A nuclear magnetic double resonance experiment has been performed to measure the high-field first-order quadrupole splittings of Na23 nuclei located in the vicinity of Li+ substitutional impurities in a single crystal of NaF. The observed quadrupole-shifted frequency of those Na23 nuclei located at (1,0,1)-type sites [relative to the Li+ impurity at the (0,0,0) lattice site] was e2qQh=±(544±10) kHz with an asymmetry parameter ?=0.65±0.05. For those Na23 nuclei at (0,0,2)-type sites, e2qQh=±(856±10) kHz with ?=0. The values of eq and ? thus obtained are compared with theoretical calculations. A mathematical analysis of the high-field double resonance process as it applies to rare, quadrupole-interacting nuclei is also presented.

Kyler F. Nelson and W. D. Ohlsen

1969-04-10T23:59:59.000Z

363

A Complete Basis Set Estimate of Cation-p Bond Strengths: Na+(ethylene) and Na+(benzene)  

SciTech Connect

Large scale second order perturbation theory and couple cluster theory calculations were performed on the Na+(ethylene) and Na+(benzene) complexes in an effort to estimate binding enthalpies in the complete basis set limit. The resulting best estimates are DH0[Na+(ethylene)] = -13.7 ? 0.2 kcal/mol and DH0[Na+(benzene)] = -23.9 ? 0.3 kcal/mol, which include small corrections for core/valence correlation effects. The former value can be compared to a measurement of -10.3 ? 1.0 kcal/mol obtained from collision induced dissociation, while the latter value is approximately midway between the two existing experimental values which differed by 6.5 kcal/mol. For the basis sets considered in this study, the counterpoise-corrected binding energies were found to be in much worse agreement with the complete basis set limit than the raw values.

Feller, David F.

2000-06-02T23:59:59.000Z

364

Electronic polarizability and crystallization of K{sub 2}O-TiO{sub 2}-GeO{sub 2} glasses with high TiO{sub 2} contents  

SciTech Connect

Some K{sub 2}O-TiO{sub 2}-GeO{sub 2} glasses with a large amount of TiO{sub 2} contents (15-25mol%) such as 25K{sub 2}O-25TiO{sub 2}-50GeO{sub 2} have been prepared, and their electronic polarizability, Raman scattering spectra, and crystallization behavior are examined to clarify thermal properties and structure of the glasses and to develop new nonlinear optical crystallized glasses. It is proposed that the glasses consist of the network of TiO{sub 6} and GeO{sub 4} polyhedra. The glasses show large optical basicities of {lambda}=0.88-0.92, indicating the high polarizabity of TiO{sub n} (n=4-6) polyhedra in the glasses. K{sub 2}TiGe{sub 3}O{sub 9} crystals are formed through crystallization in all glasses prepared in the present study. In particular, 20K{sub 2}O-20TiO{sub 2}-60GeO{sub 2} glass shows bulk crystallization and 18K{sub 2}O-18TiO{sub 2}-64GeO{sub 2} glass exhibits surface crystallization giving the c-axis orientation. The crystallized glasses show second harmonic generations (SHGs), and it is suggested that the distortion of TiO{sub 6} octahedra in K{sub 2}TiGe{sub 3}O{sub 9} crystals induces SHGs.

Fukushima, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Benino, Y. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Fujiwara, T. [Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Sendai 980-8579 (Japan); Dimitrov, V. [Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8 Kl, Ohridki Blvd., Sofia 1756 (Bulgaria); Komatsu, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)]. E-mail: komatsu@chem.nagaokaut.ac.jp

2006-12-15T23:59:59.000Z

365

Lattice variations of Ti-6Al-4V alloy with hydrogen content  

SciTech Connect

Effect of hydrogen content on the lattice parameter of Ti-6Al-4V alloy has been investigated by X-ray diffraction. The experimental results show that the solution of hydrogen in the Ti-6Al-4V alloy affects significantly on the lattice parameters of {alpha}, {beta} and {delta} phases, especially the {beta} phase. Furthermore, the critical hydrogen content of {delta} hydride formation for Ti-6Al-4V alloy is 0.385 wt.%. When the hydrogen content is lower than the critical hydrogen content, the {delta} hydride cannot precipitate and the lattice parameter ({alpha}) of {beta} phase linearly increases with the increasing of hydrogen content. When the hydrogen content is higher than the critical hydrogen content, the {delta} hydride precipitates and the lattice parameter ({alpha}) of {beta} phase varies inconspicuously with hydrogen content. In addition, the effects of lattice variations and {delta} hydride formation on microstructure are discussed. The {alpha}/{beta} interfaces of lamellar transformed {beta} phase become fuzzy with the increasing of hydrogen content because of the lattice expansion of {beta} phase. Compared with that of the Ti-6Al-4V alloy at low hydrogen content ({<=} 0.385 wt.%), the contrasts of primary {alpha} phase and transformed {beta} phase of Ti-6Al-4V alloy at high hydrogen content ({>=} 0.385 wt.%) were completely reversed due to the formation of {delta} hydride. - Research Highlights: {yields} A novel method for determining {delta} hydride in Ti-6Al-4V alloy is presented. {yields} The critical hydrogen content of {delta} hydride formation is 0.385 wt.%. {yields} The lattice parameter of {beta} phase can be expressed as follows: a=0.323(1+9.9x10{sup -2}C{sub H}) . {yields} Precipitation of {delta} hydride has a significant influence on the microstructure. {yields} The {alpha}/{beta} interfaces of transformed {beta} phase became fuzzy in the hydrogenated alloy.

Zhu Tangkui, E-mail: zhutangkui@sohu.com; Li, Miaoquan, E-mail: honeymli@nwpu.edu.cn

2011-07-15T23:59:59.000Z

366

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering M. A. Auger,1,5 L. Vzquez,1,  

E-Print Network (OSTI)

Intrinsic anomalous surface roughening of TiN films deposited by reactive sputtering M. A. Auger,1 manuscript received 1 December 2005; published 31 January 2006 We study surface kinetic roughening of Ti. The TiN films exhibit intrinsic anomalous scaling and multiscaling. The film kinetic roughening

Cuerno, Rodolfo

367

Micro artificial muscle fiber using NiTi spring for soft robotics Sangbae Kim, Elliot Hawkes, Kyujin Cho, Matthew Jolda, Joe Foley and Robert Wood  

E-Print Network (OSTI)

from shape memory alloy (NiTi) coiled springs. An enhanced spring NiTi model describes the combination of micro-coil spring, we present a novel mesh-worm prototype that utilizes bio-inspired antagonistic structure alteration, NiTi can be restructured into coil springs. Chang et al.[1], discuss the numerous

Wood, Robert

368

The influence of TiSi2 and CoSi2 growth on Si native point defects: The role of the diffusing species  

E-Print Network (OSTI)

from codeposited metal and Si. The as-deposited films had the compositions Ti, TiSi0.8 , TiSi2 undersaturation.3 Nevertheless, the mechanism by which silicide films effect a perturbance in the point defect, causing a va- cancy supersaturation. The formation of CoSi2 from CoSi proceeds via diffusion of metal

Florida, University of

369

Nonmetal ordering in TiC1-xNx: Ground-state structure and the effects of finite temperature Brian Kolb and Gus L. W. Hart  

E-Print Network (OSTI)

Nonmetal ordering in TiC1-xNx: Ground-state structure and the effects of finite temperature Brian 2004; revised manuscript received 11 February 2005; published 19 December 2005 The TiC1-xNx system has. Previous studies have not produced comprehensive results describing the ordering tendencies of TiC1-x

Hart, Gus

370

Small Au and Pt Clusters at the Anatase TiO2(101) Surface: Behavior at Terraces, Steps, and Surface Oxygen Vacancies  

E-Print Network (OSTI)

polymorph of titanium dioxide (TiO2). TiO2 is a versatile oxide material with important applications in many@ecust.edu.cn; diebold@tulane.edu Abstract: The adsorption properties of Au and Pt metal nanoclusters on TiO2 anatase edges. A preference for adsorption at type D-(112) steps is observed, which is probably a result

Diebold, Ulrike

371

Appl Nbr Full TiFirst Name Middle Name Last Name Sex Category PH Category 00036777 F ADITI GUPTA F GEN N  

E-Print Network (OSTI)

Appl Nbr Full TiFirst Name Middle Name Last Name Sex Category PH Category 00036777 F ADITI GUPTA F 00036674 F SRISHTI VIVEK SHARMA F GEN N Appl Nbr Full TiFirst Name Middle Name Last Name Sex Category PH) Appl Nbr Full TiFirst Name Middle Name Last Name Sex Category PH Category 00032299 F SANDEEP KUMAR

Ribeiro, Vinay

372

TiSnSb a new efficient negative electrode for Li-ion batteries: mechanism investigations by operando-XRD and Mossbauer techniques  

E-Print Network (OSTI)

TiSnSb a new efficient negative electrode for Li-ion batteries: mechanism investigations We report the electrochemical study of TiSnSb towards Li, as a negative electrode for Li-ion batteries. TiSnSb can reversibly take up more than 5 lithiums per formula unit leading to reversible

Boyer, Edmond

373

Performance improvement of TiO2 supported on adsorbents for photocatalytic degradation of MEK in air  

Science Journals Connector (OSTI)

Photocatalytic degradation of Methyl Ethyl Ketone (MEK) was carried out in gas phase using TiO2 supported on different adsorbents. Based on size and surface area, three different adsorbents, montmorillonite, ?-zeolite and MCM-41 were tested. A fluidised bed annular photoreactor fitted with either 254 or 365 nm lamps was used for the photodegradation studies. The removal rates of MEK were higher for the catalysts supported on the adsorbent as compared to bare TiO2 (Degussa P25 and sol-gel TiO2) due to both improved adsorption and photocatalytic degradation. The photocatalytic activity of the supported TiO2 was maximum around 50 wt.% loading of TiO2. Among all the adsorbents tested, montmorillonite showed better removal rate than MCM-41 and ?-zeolite. Some limited experiments were conducted with Trichloroethylene (TCE) to evaluate the effect of polarity of the organic compound on overall degradation using the supported catalysts.

Pavan Kumar Puttamraju; Madhumita B. Ray

2008-01-01T23:59:59.000Z

374

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

SciTech Connect

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.

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)

2014-08-15T23:59:59.000Z

375

High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity  

SciTech Connect

There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

Hwang, Yun Jeong; Boukai, Akram; Yang, Peidong

2008-11-15T23:59:59.000Z

376

Ann bay lodyans 3 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network (OSTI)

la di: "Sa fe 2 fwa." Bourik la fe yon twazyem fopa. Neg la desann bourik la ak madanm li, epi li touye bourik la. Madanm li di: "Poukisa ou fe sa?" Neg la d i : " S a fe yon fwa." Se konsa zarenyen te | r p rive touye ni ti sourit, ni YMk c n.... "Monkonpe Chen, m raze net. Ou pa ta gen yon ti pyas prete m? M a remet ou li denmen a midi." Konpe Chen di li: "Men, pran sa. Denmen a midi m a pase chache li." Zarenyen reponn li: 2 "Wi, pa gen pwoblem. Ou met vini, m ap pare pou ou." Apre sa...

Freeman, Bryant C., ed.

2000-01-01T23:59:59.000Z

377

Ann bay lodyans 16 / Se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network (OSTI)

pral gen yon kantite pye kdb. N ap gen kdb pase Tonton Elifet." sa a. Li mande Ti Malis: "Kote ou jwenn tout kdb sa yo?" Ti Malis reponn: "Se Tonton Elifet ki ban m 2 Malis mete men nan tet. Li di: "Wouch! Sa ou fe la a, Tonton Bouki?" Malis...? / BWA CHECH! 1) Kisa ki gen kat pat, ki konn manje pay, ki gen yon ke, epi ki kap we menm jan devan kou deye? 2) Kisa yon neg kap fe sou de janm, yon chen kap fe sou twa janm, epi yon f i kap fe le I chita? 3) Yo sevi I manje, li kanpe sou kat pye...

Freeman, Bryant C., ed.

2000-01-01T23:59:59.000Z

378

Superior Corrosion Resistance Properties of TiN-Based Coatings on Zircaloy Tubes in Supercritical Water  

SciTech Connect

Thin films of TiN and Ti0.35Al0.65N nanocomposite were deposited on polished Zircaloy-4 tubes. After exposure to supercritical water for 48 h, the coated tubes are remarkably intact, while the bare uncoated tube shows severe oxidation and breakaway corrosion. X-ray diffraction patterns, secondary electron images, backscattered electron images, and energy dispersive X-ray spectroscopy data from the tube surfaces and cross-sections show that a protective oxide, formed on the film surface, effectively prevents further oxidation and corrosion to the Zircaloy-4 tubes. This result demonstrates the effectiveness of thin film ceramics as protective coatings under extreme environments.

Fauzia Khatkhatay; Liang Jiao; Jie Jian; Zhijie Jiao; Hongbin Zhang; Jian Gan; Haiyan Wang; Wenrui Zhang; Xinghang Zhang

2014-08-01T23:59:59.000Z

379

Microstructure and tensile properties of spray formed gamma Ti48.9at.%Al  

SciTech Connect

Until now only a limited number of spray forming experiments on TiAl were reported, and the mechanical data of sprayed material of these alloys are rather rare. In this paper, the application of the EIGA-technique (Electrode Induction Melting Gas Atomization) for spray forming of binary Ti48.9Al(at.%) is reported. Sprayed deposits, obtained under near optimum conditions are tensile tested at room temperature and microstructurally characterized. The results are compared to similar alloys obtained by other process routes.

Liu, K.W. [GKSS Forschungszentrum, Geesthacht (Germany)] [GKSS Forschungszentrum, Geesthacht (Germany); [Univ. of Science and Technology, Beijing (China). State Kay Lab for Advanced Metals and Materials; Gerling, R.; Schimansky, F.P. [GKSS Forschungszentrum, Geesthacht (Germany)] [GKSS Forschungszentrum, Geesthacht (Germany)

1999-02-05T23:59:59.000Z

380

High-spin gamma spectroscopy of recoil-separated Cr49, V49, and Ti46  

Science Journals Connector (OSTI)

The reaction Ca40+12C at ECa=160 MeV has been used to study high-spin states in the recoil-separated nuclides Cr49, V49, and Ti46. The latter two show distinctive f7/2 shell-model behavior up to J?=27/2- and 12+, respectively, while the first appears to be a collective rotor with a particle alignment at J?=17/2-. Rotorlike bands of sd-shell origin were seen in V49 and Ti46 up to J?=11/2+ and 11-, respectively.

J. A. Cameron, M. A. Bentley, A. M. Bruce, R. A. Cunningham, W. Gelletly, H. G. Price, J. Simpson, D. D. Warner, and A. N. James

1991-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Structural, textural and catalytic properties of Al-, Ti-pillared clays  

SciTech Connect

Al-, Ti- and Zr-pillared clays were characterized and NiMo/Pilc`s were tested in HDS reactions. The combination of activity measurements with Moessbauer Spectroscopy and x-ray microanalysis at microscopical scale give insight in the metal phases migration during pillaring, reaction and regeneration steps. {Alpha}-Fe phase in free Fe{sub 2}O{sub 3} islands predominate together with structural Fe{sup 3+} phase, but during the catalytic reaction Fe{sup 2+} forms. Delamination of the Ti- and Zr-Clay supports, together with high Lewis acidity might enhance their catalytic properties.

Ramos-Galvan, C.E.; Dominguez, J.M.; Sandoval-Robles, G.; Castillo-Mares, A.; Nava E, N.

1996-12-31T23:59:59.000Z

382

Full $fp$-shell study of even-even $^{48-56}$Ti isotopes  

E-Print Network (OSTI)

The level schemes and transition rates {\\em B}({\\em E}2;$\\uparrow$) of eve-even $^{48-56}$Ti isotopes were studied by performing large-scale shell model calculations with FPD6 and GXPF1 effective interactions. Excellent agreement were obtained by comparing the first 2$^{+}$ level for all isotopes with the recently available experimental data, but studying the transition strengths {\\em B}({\\em E}2; 0$^+_{g.s.} \\to2^+_1$) for all Ti isotopes using constant proton-neutron effective charges prove the limitations of the present large-scale calculations to reproduce the experiment in detail.

F. A. Majeed; A. A. Auda

2006-02-02T23:59:59.000Z

383

Oxygen Reduction Catalyzed by Au–TiO2 Nanocomposites in Alkaline Media  

Science Journals Connector (OSTI)

Au?TiO2 nanocomposite; oxygen reduction; alkaline media; RRDE; Tafel plot ... In another study, Kim et al.(14) prepared titanium oxide by heat treatment of titanium sheets in the temperature range of 600–1000 °C, and the best catalysts were identified as those prepared at 900 °C where ORR occurred at the potential of about +0.65 V versus RHE in 0.1 M H2SO4. ... In a typical measurement, 1 mg of the Au–TiO2 nanocomposite catalysts, 4 mg of carbon powder, and 10 ?L of Nafion were ultrasonically mixed in 1 mL of methanol. ...

Chan Lin; Yang Song; Lixin Cao; Shaowei Chen

2013-11-11T23:59:59.000Z

384

Reinterpretation of Wavelength-Modulated Absorption in SrTiO3 without Coexisting Phases  

Science Journals Connector (OSTI)

In a recently reported measurement of the wavelength-modulated absorption of SrTiO3, the results were interpreted as evidence for the coexistence of two phases over a temperature range of 60 K about the 105-K phase transition. We refute that interpretation by proposing an alternative which is necessary and sufficient to be fully consistent with the known properties of SrTiO3 and which is unconnected with the phase transition. We also propose an experimental test of the validity of this new interpretation.

David Redfield and William J. Burke

1972-02-14T23:59:59.000Z

385

Enhancing the Electron Mobility via Delta-Doping in SrTiO3  

SciTech Connect

We fabricated high-mobility {delta}-doped structures in SrTiO{sub 3} thin films in order to investigate the low temperature electronic transport properties of confined carriers in this system. An enhancement of the electron mobility above the bulk value was observed as the doped layer thickness decreased. High-field Hall measurements revealed that this mobility enhancement originates from higher-mobility electrons in the undoped clean regions, which have quantum-mechanically broadened from the doped layer. Because of the absence of apparent lattice misfit between the layers, this structure is highly suitable for investigating two-dimensional electron gases in SrTiO{sub 3}

Kozuka, Y.

2011-08-11T23:59:59.000Z

386

Ann bay lodyans 12 / Se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network (OSTI)

a, Bondye fe yon bon ti melanj: li pran bwode ki gen nan pan, di ki gen nan woch, fines ki gen nan ke zwazo, douse ki gen nan siwo myel, mechanste ki gen nan tig, chale ki gen nan dife, fredi ki gen nan lanej. Bondye kontwole yo, sa pa ase.... Yo te viv ansanm pandan kek tan konsa. Men yon jou, msye a al devan Bondye ansanm ak fi a. Li pote I remet Bondye. Li di konsa: "Bondye, m pa kapab viv ak zanmi ou ban mwen an. Li pale san rete, li fatige m twop, menm yon ti poze m pa kab fe. Sa...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

387

Ann bay lodyans 5 / se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network (OSTI)

genyen. Tijo we yon tig ki te tonbe nan yon gwo twou. Li pa t kapab soti paske twou a fon. Kounye a tig la prizonye. Li di Tijo: "Ou se yon bon ti gason, ede m soti, souple." Tijo reponn: "Si mwen retire ou nan twou a, ou ap manje m." Tig la di: "O... non, bon ti pitit mwen, mwen p ap manje ou. Pa panse sa, non." Tijo mande li: "Eske ou ap pwomet mwen ou p ap manje m?" "Wi, pwomes fet," tig la di I avek gwo vwa li. Tijo ede tig la soti nan twou a. Le tig la fin soti, li vole sou T i j...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

388

Effect of laser irradiation on failure mechanism of TiCp reinforced titanium composite coating produced by laser cladding  

Science Journals Connector (OSTI)

Abstract Laser cladding is an effective technique to coat a metallic substrate with a layer of a different nature. It has been widely reported that the most important combined parameters controlling the quality of the coating are the specific energy (E) and the powder density (?). In the present work, clad deposits of Ti6Al4V + 60 wt.% TiC were prepared on a Ti6Al4V substrate using an optimum combination of Ec = 24 J/mm2 and ?c = 3 mg/mm2. These experiments were performed using a laser power of 400 and 600 W, in order to study the effect of laser power on the properties of the clad. The microstructure, phase composition and nanohardness of the coatings were investigated by optical microscopy, scanning electron microscopy and X-ray diffraction. During laser processing, TiC can be partially converted to TiCX (X = 0.5) due mainly to the TiC dissolution into the laser-generated melting pool and subsequent precipitation during cooling. It was observed that the lower laser power limit reduces primary TiC dissolution but it also promotes secondary carbide alignment at the interface. On the other hand, the damage mechanism induced by high laser power is dominated by primary TiC particle cracking by the high stress concentration at the particle–matrix interface followed by ductile failure of the matrix. It is also remarkable that irradiance affects the TiC/TiCx ratio despite Ec and ?c are fixed and it determines hardness distribution inside the coating.

J.J. Candel; J.A. Jimenez; P. Franconetti; V. Amigó

2014-01-01T23:59:59.000Z

389

In situ X-ray diffraction strain-controlled study of Ti–Nb–Zr and Ti–Nb–Ta shape memory alloys: crystal lattice and transformation features  

SciTech Connect

Phase and structure transformations in biomedical Ti–21.8Nb–6.0Zr (TNZ) and Ti–19.7Nb–5.8Ta (TNT) shape memory alloys (at.%) under and without load in the ? 150 to 100 °S temperature range are studied in situ using an original tensile module for a low-temperature chamber of an X-ray diffractometer. Alpha?- and beta-phase lattice parameters, the crystallographic resource of recovery strain, phase and structure transformation sequences, and microstress appearance and disappearance are examined, compared and discussed. For both alloys, the crystallographic resource of recovery strain decreases with temperature increase to become 4.5% for TNZ and 2.5% for TNT alloy (at RT). Loading at low temperatures leads to additional ??-phase formation and reorientation. Heating under load, as compared to strain-free heating, affects the reverse transformation sequence of both alloys in different ways. For TNZ alloy, strain-free heating results in simultaneous ??? and ???? transformations, whereas during heating under stress, they are sequential: ? + ???? precedes ????. For TNT alloy, strain-free heating results in reverse ???? transformation, whereas during heating under stress, ???? transformation is preceded by ??-phase reorientation. - Highlights: • Comparative in situ XRD analysis of Ti–Nb–Zr(Ta) shape memory alloys is realized. • Lattice parameters of ?- and ??-phases are calculated in the ? 150 to + 100 °C range. • The higher the temperature, the lower the ???? transformation strain. • Loading at low temperatures results in ??-phase formation and reorientation. • Transformation sequences upon heating with and without loading are different.

Dubinskiy, S. [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation); Prokoshkin, S. [National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation); Brailovski, V., E-mail: vladimir.brailovski@etsmtl.ca [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); Inaekyan, K. [École de technologie supérieure, 1100, Notre-Dame Street West, Montreal, Quebec H3C 1K3 (Canada); Korotitskiy, A. [National University of Science and Technology “MISIS”, 4, Leninskiy prosp., Moscow 119049 (Russian Federation)

2014-02-15T23:59:59.000Z

390

In-situ imaging of the nucleation and growth of epitaxial anatase TiO2(001) films on SrTiO3(001)  

SciTech Connect

The growth of TiO2 anatase films on Nb doped SrTiO3(001) by oxygen-assisted molecular beam epitaxy has been studied in-situ by scanning tunneling microscopy. We show that the initial growth follows the Stranski-Krastanov mode, where islands form on top of a wetting layer consisting of two monolayers (ML) of TiO2. The epitaxial islands subsequently nucleate and coalescence into large commonly-oriented crystallites. The (4x4) reconstruction observed by reflection high-energy electron diffraction (RHEED) is shown to result from the coexistence of individual (4x1) and (1x4) reconstructions present on different crystallite surfaces. The anatase grows in units of bilayers, resulting in a step height of 2 ML (~0.5 nm). This result explains the fact that the measured period of the RHEED specular-beam intensity oscillations corresponds to the time required for deposition of 2 ML. Ar ion sputtering and UHV annealing results in a transformation to coexisting (4x1) and (1x4) reconstructed terraces on individual crystallites, as commonly observed by ex-situ STM studies.

Du, Yingge; Kim, Dong Jun; Kaspar, Tiffany C.; Chamberlin, Sara E.; Lyubinetsky, Igor; Chambers, Scott A.

2012-09-30T23:59:59.000Z

391

Effects of Point Defects and Impurities on Kinetics in NaAlH4  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Alanate * Viable hydrogen storage material (5.6 wt%) NaAlH 4 13 Na 3 AlH 6 + 23 Al + H 2 Na 3 AlH 6 3 NaH + Al + 32 H 2 * But: reactions slow - Only happen at too...

392

" East North Central",9.3,"NA",10.1,10.7,11.6,11.85822  

U.S. Energy Information Administration (EIA) Indexed Site

" 60 Years or More","NA","NA",7.9,8.5,9.3,9.47261 "Race of Householder1" " White",9.3,"NA",10.2,10.6,11.5,11.86841 " Black ",9.8,"NA",10.8,11.2,11.2,12.05862 " Other...

393

" East North Central",21.3,"NA",26,27.6,29,32.4  

U.S. Energy Information Administration (EIA) Indexed Site

" 60 Years or More","NA","NA",14.3,23.1,24.9,30.3 "Race of Householder1" " White",115.3,"NA",132.2,135.3,138.6,149.5 " Black ",11,"NA",10.6,12.8,11.2,16.6 " Other...

394

Optical properties of hierarchical-nanostructured TiO{sub 2} and its time-dependent photo-degradation of gaseous acetaldehyde  

SciTech Connect

The TiO{sub 2} hierarchical nanostructures (HNs) composed of rutile TiO{sub 2} nanowires on anatase TiO{sub 2} nanofibers had higher photocatalytic activities of 62% and 48% than the commercial TiO{sub 2} nanoparticles (?21 nm diameter) in the continuous flow mode and closed-circulation mode, respectively, leading to an efficient degradation of gaseous acetaldehyde under UV-light irradiation. This behavior may be attributed to the effective TiO{sub 2} HNs with specific surface area of 85.1 m{sup 2}/g and lower radiative recombination of self-trapped excitons, enabling an effective electron-hole separation.

Ahn, Kyun; Jeong, Se-Young; Cho, Chae-Ryong [College of Nanoscience and Nanotechnology, Pusan National University, Busan 609-735 (Korea, Republic of)] [College of Nanoscience and Nanotechnology, Pusan National University, Busan 609-735 (Korea, Republic of); Kim, Min-Sun; Kim, Soon-Hyun; Hyun Kim, Jae [Division of Nano and Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873 (Korea, Republic of)] [Division of Nano and Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873 (Korea, Republic of); Kim, Jong-Pil; Sung Jin, Jong [Division of High Technology Materials Research, Korea Basic Science Institute, Busan 618-230 (Korea, Republic of)] [Division of High Technology Materials Research, Korea Basic Science Institute, Busan 618-230 (Korea, Republic of)

2013-12-23T23:59:59.000Z

395

Inorganic-modified semiconductor TiO2 nanotube arrays for photocatalysis  

E-Print Network (OSTI)

or photoelectrochemical degradation of organic pollutants, the splitting of water into H2, and solar cells holds promise for meeting the global challenge of supplying clean energy. In this context, semiconductor TiO2 stands out and depletion of fossil fuel resources have emerged as two major obstacles for the sustainable development

Lin, Zhiqun

396

Photocatalytic Synthesis of TiO2 and Reduced Graphene Oxide Nanocomposite for Lithium Ion Battery  

Science Journals Connector (OSTI)

In this work, we synthesized graphene oxide (GO) using the improved Hummers’ oxidation method. TiO2 nanoparticles can be anchored on the GO sheets via the abundant oxygen-containing functional groups such as epoxy, hydroxyl, carbonyl, and carboxyl groups ...

Jingxia Qiu; Peng Zhang; Min Ling; Sheng Li; Porun Liu; Huijun Zhao; Shanqing Zhang

2012-06-27T23:59:59.000Z

397

Theoretical Study on the Reaction of Ti+ with Acetone and the Role of Intersystem  

E-Print Network (OSTI)

the chemical reactions of a transition-metal ion with an organic molecule in the gas phase may provide useful investigations aiming at explaining the reaction mechanisms of the first-row transition-metal ions with organic appears to vary depending on the metal ion involved.5-8 Early transition-metal cations such as Ti+ and Sc

Ihee, Hyotcherl

398

St h ti d i l i fStochastic dynamic analysis of offshore wind turbines  

E-Print Network (OSTI)

1 St h ti d i l i fStochastic dynamic analysis of offshore wind turbines ­ with emphasis on fatigue analysis of offshore bottom-fixed wind turbines · Modelling and dynamic analysis of floating wind turbines ­ Stochastic dynamic analysis of offshore wind turbines; mooring system for wave energy converters · 2010 8

Nørvåg, Kjetil

399

www.ti.com SNOSC25B MAY 2004REVISED OCTOBER 2004 LM741 Operational Amplifier  

E-Print Network (OSTI)

LM741 www.ti.com SNOSC25B ­MAY 2004­REVISED OCTOBER 2004 LM741 Operational Amplifier Check for Samples: LM741 1FEATURES 2· Overload protection on the input and output · No latch-up when the common mode range is exceeded DESCRIPTION The LM741 series are general purpose operational amplifiers which feature

Lynch, Jerome P.

400

China For all ages a MulTi-generaTional exPloraTion  

E-Print Network (OSTI)

China For all ages a MulTi-generaTional exPloraTion The greaT Wall, TerraCoTTa Warriors & The MighCTuresque China Experience the Delights of a Well-Crafted Family Tour Dear Princetonian, Join Princeton Journeys, June 27 ­ July 9, 2013, for a comprehensive tour of China designed with families in mind. Explore

Rowley, Clarence W.

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Surface Engineering to Improve the Durability and Lubricity of Ti-6Al-4V Alloy  

SciTech Connect

Titanium alloys offer high strength, high corrosion resistance, and the opportunity to reduce the weight of heavy vehicle engine components, but they do not perform well as bearing surfaces without further treatments or coatings. This paper explores a series of surface engineering treatments to improve the friction and wear behavior of Ti-6Al-4V alloy under diesel engine oil-lubricated conditions.

Bansal, Dinesh G [ORNL; Eryilmaz, Osman L [Argonne National Laboratory (ANL); Blau, Peter Julian [ORNL

2011-01-01T23:59:59.000Z

402

Anodic Behavior of Ti in KOH Solutions Ellipsometric and Micro-Raman Spectroscopy Studies  

E-Print Network (OSTI)

Anodic Behavior of Ti in KOH Solutions Ellipsometric and Micro-Raman Spectroscopy Studies A. Prusi of South Carolina, Columbia, South Carolina 29208, USA Anodic formation of oxide films on titanium surfaces of refraction of anodic oxide films have been determined. The voltage at which the oxide film breaks down

Popov, Branko N.

403

Microscopic mechanisms of metastable phase formation during ball milling of intermetallic TiAl phases  

SciTech Connect

Powders of the intermetallic equilibrium phases {alpha}{sub 2}-Ti{sub 3}Al, {gamma}-TiAl and TiAl{sub 3} were ball milled in order to investigate the microscopic origins of the energetic destabilization and the transformation into metastable phases during the milling process. It was found that the intermetallic phases were chemically partially disordered on milling followed by the transformation into solid solution phases after long milling. In detail, for the {gamma} phase, the formation of numerous deformation twins, thin h.c.p. lamellae and lamellae of the 9R phase formed by an antitwin operation was observed by TEM. The disordering of the D0{sub 22}-TiAl{sub 3} phase occurred inhomogeneously in the material via the formation of antiphase boundaries on (001) planes, resulting in a f.c.c. solid solution in the final state. In summary, it can be concluded that the formation of the observed metastable phases results from chemical disordering, whereas the excess enthalpy of grain boundaries plays only a minor role for the energetical destabilization of the intermetallic compounds during milling in this case.

Klassen, T.; Oehring, M.; Bormann, R. [GKSS Research Centre, Geesthacht (Germany)] [GKSS Research Centre, Geesthacht (Germany)

1997-09-01T23:59:59.000Z

404

Crack initiation and crack growth resistance of Ti-48Al-2Cr sheet material  

SciTech Connect

The present paper reports on the fracture toughness tests conducted on Ti-48Al-2Cr sheet material with near-gamma microstructure produced by hot rolling. Compact tension specimens were sectioned from sheet material and tested at room temperature to determine the fracture toughness and crack growth resistance curves. The deformation and fracture behavior were studied on tested specimens.

Dogan, B.; Schwalbe, K.H. [GKSS Research Centre, Geesthacht (Germany)] [GKSS Research Centre, Geesthacht (Germany); Clemens, H. [Plansee AG, Reutte (Austria)] [Plansee AG, Reutte (Austria)

1998-03-03T23:59:59.000Z

405

Transesterification of soybean oil catalyzed by Sr–Ti mixed oxides nanocomposite  

Science Journals Connector (OSTI)

Abstract Sr–Ti mixed oxides as nanocomposite was prepared by sol–gel method and used as a basic heterogeneous catalyst for transesterification of soybean oil with methanol to methyl esters (biodiesel). The catalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA/DTA) and CO2-TPD techniques. It was found that reaction of methanol and soybean oil with the molar ratio of 15 in the presence of 1% Sr–Ti (based on the soybean oil weight) with the molar ratio of 0.8 and calcined at 965 °C as catalyst affords biodiesel in excess of 98% at 60 °C within 15 min. Effect of catalyst calcination temperature, Sr to Ti molar ratio, reaction temperature, catalyst amount, methanol to oil molar ratio and reaction time along with the key role of Sr2TiO4 phase in nanocomposite as an important factor on transesterification efficiency will be discussed in this presentation.

Elnaz Rashtizadeh; Faezeh Farzaneh

2013-01-01T23:59:59.000Z

406

Formation and characterization of TiO2/CNT nanomaterials dried under supergravity conditions  

Science Journals Connector (OSTI)

The elaboration of bilayer TiO2/CNT films dried under terrestrial gravity conditions (g) and on a centrifuge with 1.3g and 7g is reported. The changes in microstructure and thickness of these coatings under supergravity environment ...

Minerva Vargas; Marina E. Rincón; Eduardo Ramos

2009-01-01T23:59:59.000Z

407

Band-engineered SrTiO{sub 3} nanowires for visible light photocatalysis  

SciTech Connect

We have theoretically investigated the structural, electronic, and optical properties of perovskite SrTiO{sub 3} nanowires for use in visible light photocatalytic applications using pseudopotential density-functional theory calculations. The electronic structure calculations show that the band gap is modified in the SrTiO{sub 3} nanowires compared with that of the bulk. For TiO{sub 2}-terminated nanowires, the mid-band states induced by the combination of oxygen and strontium atoms on the surface lead to a shift in the valence band toward the conduction band without interference from the edge of the conduction band, which reduces the band gap. On the contrary, the electronic states induced by the combination of oxygen and strontium atoms on the surface of SrO-terminated nanowires lead to a shift in the conduction band toward the valence band. The calculated optical results indicate that the absorption edge of the nanowires shift towards the red-light region. These theoretical results suggest that perovskite SrTiO{sub 3} nanowires are promising candidates for use in visible light photocatalytic processes such as solar-assisted water splitting reactions.

Fu, Q.; He, T.; Li, J. L.; Yang, G. W. [State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong (China)

2012-11-15T23:59:59.000Z

408

ORIGINAL ARTICLE Strength and microstructure of laser fusion-welded TiSS  

E-Print Network (OSTI)

ORIGINAL ARTICLE Strength and microstructure of laser fusion-welded Ti­SS dissimilar material pair robust and reliable dissimilar metal joints has the potential to enable new func- tionalities and reduce the manufacturing costs of medical devices. The need for dissimilar material welds in the med- ical device industry

Yao, Y. Lawrence

409

Short communication Effect of vanadium redox species on photoelectrochemical behavior of TiO2  

E-Print Network (OSTI)

. Alternative and sustainable energy sources such as solar, wind, tidal power, geothermal, hydroelectricity implementation is hydrogen handling. Although molecular hydrogen has very high energy density on a mass basis and TiO2/WO3 photo-electrodes Dong Liu a , Fuqiang Liu a,*, Jianguo Liu b a Electrochemical Energy Lab

Liu, Fuqiang

410

Microstructure and wear properties of Fe–TiC surface composite coating by laser cladding  

Science Journals Connector (OSTI)

AISI 1045 steel surface was alloyed with pre-placed ferrotitanium and graphite powders by using a 5-kW CO2 laser. In situ TiC particles reinforced Fe-based ... ferrotitanium and graphite in the molten pool during...

Shiyao Qu; Xinhong Wang; Min Zhang; Zengda Zou

2008-03-01T23:59:59.000Z

411

The influence of surface conductivity on the apparent zeta potential of TiO2 nanoparticles  

E-Print Network (OSTI)

Titanium dioxide is widely used as TiO2 nanoparticles and has a large variety of potential applications in of these properties, the surface ionization of titanium dioxide nanoparticles in contact with an electrolytic solution is a physico-chemical parameter of particular importance to describe ion adsorption and electrostatic

Paris-Sud XI, Université de

412

Photocatalytic Degradation of VOC's by TOTO's Hydrotect (TiO2 Impregnated) Surfaces  

E-Print Network (OSTI)

, naturally occurs in wood and volcanic gases. Decaying organic matter can also produce methanol. Paint. This report describes the photocatalytic degradation of formaldehyde and methanol, two common VOC's, by TiO2 and methanol tests (Land et al., 2008). A standardized aqueous solution of formaldehyde and methanol was used

Bergin, Mike

413

Absorption Spectra Related to Heterogeneous Electron Transfer Reactions: The Perylene TiO2 System  

E-Print Network (OSTI)

Absorption Spectra Related to Heterogeneous Electron Transfer Reactions: The Perylene TiO2 System Form: March 16, 2005 Linear absorption spectra of dye-semiconductor systems (perylene attached displaying line broadenings follow the qualitative trend obtained from transient absorption spectra. I

Röder, Beate

414

Dielectric Properties of SrTiO3 at Low Temperatures  

Science Journals Connector (OSTI)

We have measured the temperature dependence of the dielectric constants for single-domain SrTiO3 crystals. Dielectric anisotropies and deviations from the simple Curie-Weiss law have been observed and are discussed in connection with the structural phase transitions at 110 and 65°K.

T. Sakudo and H. Unoki

1971-04-05T23:59:59.000Z

415

Hybrid Carbon Nanotubes-TiO2 Photoanodes for High Efficiency Dye-Sensitized Solar Cells  

E-Print Network (OSTI)

Hybrid Carbon Nanotubes-TiO2 Photoanodes for High Efficiency Dye-Sensitized Solar Cells Kadiatou-Boulet, Varennes, Quebec J3X 1S2, Canada Department of Chemical Sciences and Technology & NAST Center, University, 25133 Brescia, Italy Solar Cells Laboratory, Institute of Materials Science and Technology (IMRE

416

MEASUREMENT OF Ti3+ RATIOS IN PYROXENE IN WARK-LOVERING RIMS: EVIDENCE FOR  

E-Print Network (OSTI)

IN A REDUCING SOLAR NEBULA. S. B. Simon1 , S. R. Sutton1,2 and L. Grossman1,3 . 1 Dept. Geophysical Sci., 5734 S cations, per 6 oxygen ions, and therefore little or no Ti3+ . They kindly loaned us one of their samples

Grossman, Lawrence

417

DE-RP52-08NA28091  

NLE Websites -- All DOE Office Websites (Extended Search)

8NA28091 8NA28091 [Submit in Volume I, TAB 2] Attachment L-1 Page 1 of 4 CORPORATE, PARTNERSHIP, JOINT VENTURE CERTIFICATES If the offer is submitted by a corporation, partnership or a Joint Venture, the applicable form provided on the following pages must be completed and submitted in Volume I of the proposal. In the alternative, other evidence must be submitted to substantiate the authority of the person signing the offer. If a corporation, the same officer shall not execute both the offer and the certificate. DE-RP52-08NA28091 [Submit in Volume I, TAB 2] Attachment L-1 Page 2 of 4 CORPORATE CERTIFICATE I, _______________________________________________, certify that I am the Secretary of the

418

Nanocrystalline {001} TiO2/carbon aerogel electrode with high surface area and enhanced photoelectrocatalytic oxidation capacity  

Science Journals Connector (OSTI)

Abstract Aiming at further developing the application of the highly reactive {001} TiO2 in photoelectrocatalytic oxidation, which is limited by the powder form, micron-size and low surface area, a nanocrystalline {001} TiO2/carbon aerogel (CA) photoelectrode was fabricated via a facile hydrothermal method. Nano-sized (50 nm) anatase {001} TiO2 was successfully grown on a CA substrate. The obtained photoelectrode endowed high surface area (537 m2 g?1) and enhanced photoelectrocatalytic oxidation performance. Under UV light illumination, the largest photocurrent density is obtained on 50 nm {001} TiO2 (5.58 mA cm?2), compared to 150 nm (4.17 mA cm?2), 1 ?m (2.83 mA cm?2) {001} TiO2, indicating that an obvious enhancement in photoelectrocatalytic oxidation activity was achieved when crystalline size reached nanometer scale. A high methylene blue removal of 93% was obtained on 50 nm {001} TiO2/CA, and the rate constant reached 8.46 × 10?3 min?1, which was twice as that of P25/CA and around twenty times that of 50 nm{001} TiO2/FTO.

Ya-nan Zhang; Yefei Jin; Xiaofeng Huang; Huijie Shi; Guohua Zhao; Hongying Zhao

2014-01-01T23:59:59.000Z

419

Multilayer films of indium tin oxide/TiO2 codoped with vanadium and nitrogen for efficient photocatalytic water splitting  

Science Journals Connector (OSTI)

TiO22 films codoped with V cations and N anions were synthesised by RF-magnetron sputtering. The incorporation of V and N in TiO2 lattice produces isolated energy levels near the conduction and valence bands, respectively, causing an effective narrowing of the band gap to 2.5 eV. Recombination of photo-charges was reduced by depositing multilayer films of indium tin oxide (ITO)/V-N-codoped TiO2 with different numbers of bilayers. In multilayer structure, the generated photoelectrons, travelling into TiO2 film of limited thickness, rapidly enter the space charge interface of the ITO/TiO2 films from where they are instantaneously injected into the ITO layer and then removed towards the cathode. The synergic effects created by band narrowing and enhanced charge separation by using codoping and multilayer structure strategy in TiO2 generate higher photocurrent for water splitting under visible light which definitely exceeds that obtained by doping TiO2 with a single, V or N, element.

Z. El Koura; N. Patel; R. Edla; A. Miotello

2014-01-01T23:59:59.000Z

420

TiO2-assisted degradation of a perfluorinated surfactant in aqueous solutions treated by gliding arc discharge  

Science Journals Connector (OSTI)

The plasma–chemical degradation of Forafac 1110, a perfluorinated non-ionic surfactant, in aqueous solutions was investigated using TiO2 catalysts. The considered plasma was the gliding arc in humid air, which results from an electric discharge at atmospheric pressure and quasi-ambient temperature. Two titanium dioxide powders were used and their synergistic effects on the Forafac degradation were compared. The results were discussed through the evolution of the pH, the conductivity, the fluoride ions concentration released in solutions, the surfactant concentration remaining after treatment and the chemical oxygen demand (COD) measurement. The combination of the plasma–chemical treatment with heterogeneous catalysis through the use of TiO2 accelerated the Forafac degradation, since only 60 min was sufficient to remove 96% instead of 360 min needed in the absence of TiO2. The use of anatase and rutile under the trade-name of Rhodia TiO2 and Merck TiO2, respectively, led to different results, because Rhodia TiO2 has proven to be more efficient. It would seem that the crystalline phase as well as the crystallite size, explain the efficiency of anatase. The advantage of the plasma-catalysis is due to the fact that there is a significant production of the OH• radicals not only generated by the gliding arc discharge but also by TiO2.

Kheira Marouf-Khelifa; Fatiha Abdelmalek; Amine Khelifa; Ahmed Addou

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Measurement of low-energy Na^+ -- Na total collision rate in an ion--neutral hybrid trap  

E-Print Network (OSTI)

We present measurements of the total elastic and resonant charge-exchange ion-atom collision rate coefficient $k_\\mathrm{ia}$ of cold sodium (\\ce{Na}) with optically-dark low energy \\ce{Na+} ions in a hybrid ion-neutral trap. To determine $k_\\mathrm{ia}$, we measured the trap loading and loss from both a \\ce{Na} magneto-optical trap (MOT) and a linear radio frequency quadrupole Paul trap. We found the total rate coefficient to be $7.4 \\pm 1.9 \\times 10^{-8}$ cm$^3$/s for the type I \\ce{Na} MOT immersed within an $\\approx 140$ K ion cloud and $1.10 \\pm 0.25 \\times 10^{-7}$ cm$^3$/s for the type II \\ce{Na} MOT within an $\\approx 1070$ K ion cloud. Our measurements show excellent agreement with previously reported theoretical fully quantal \\textit{ab initio} calculations. In the process of determining the total rate coefficient, we demonstrate that a MOT can be used to probe an optically dark ion cloud's spatial distribution within a hybrid trap.

Goodman, D S; Kwolek, J M; Blümel, R; Narducci, F A; Smith, W W

2014-01-01T23:59:59.000Z

422

Electronic and optical properties of TiCoSb under different pressures  

SciTech Connect

The electronic structure and optical properties of TiCoSb are studied by the first-principles calculation. It is found that the band gaps increase with the pressure increasing. It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of the valence band (VB) shifting away from the Fermi level. Our calculation indicates that TiCoSb has the large density of state near the Fermi level; moreover, the changes of the density of states near the Fermi level mainly are caused by Ti 3d and Co 3d under the different pressures. It is noted that the absorption edge increases with an increase of pressure. As pressure increases, the static dielectric constants {epsilon}{sub 1}(0) decrease. All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move towards higher energies within increasing pressure. - Graphical abstract: The first peak positions of the absorption spectrum increase and shift the high energy with an increase of pressure. The buleshift of the absorption edge could be observed. Highlights: Black-Right-Pointing-Pointer It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of VB moving away from the Fermi level. Black-Right-Pointing-Pointer It is noted that the absorption edge increases with an increase of pressure. Black-Right-Pointing-Pointer As pressure increases, the static dielectric constant {epsilon}{sub 1}(0) decreases. Black-Right-Pointing-Pointer All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move to wards higher energies within creasing pressure.

Xu Bin, E-mail: hnsqxb@163.com [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Zhang Jing [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Liang Jianchu [Department of electronic science, Huizhou University, Guangdong 516001 (China); Gao Guoying; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)

2012-08-15T23:59:59.000Z

423

Co-doped Anatase TiO? Heteroepitaxy on Si(001)  

SciTech Connect

Pure anatase TiO? and CoxTi?-x O? (0.01 < x < 0.04) epitaxial thin films were deposited by oxygen-plasma-assisted molecular beam epitaxy (OPA-MBE) on Si(001) for evaluation as a potential dilute magnetic semiconductor material suitable for Si-based spintronic devices. Epitaxial growth on Si(001) was facilitated by the deposition of ¼or ½ ML Sr metal on the clean Si(001) surface to form an oxidation resistant silicide layer, followed by deposition of a thin SrTiO? buffer layer. Using ½ ML Sr metal to form the silicide allowed the deposition of 10 ML SrTiO? without oxidation of the Si interface. Epitaxial anatase could be grown on this heterostructure, although use of the oxygen plasma during deposition resulted in significant SiO? formation. Pure anatase films consisted of epitaxial anatase surface particles on a continuous anatase film. For Co-doped films, Co segregation to surface particles of epitaxial anatase was observed by Auger electron spectroscopy and transmission electron microscopy (TEM); faceting of the particles was observed for low Co doping concentrations. Although no secondary phases containing Co were observed in Co-doped anatase films by x-ray diffraction or TEM, x-ray absorption near edge spectroscopy indicated Co was present in the films as a mixture of Co(0), Co(II), and Co(III). All samples were ferromagnetic at room temperature; for lower Co concentrations, the ferromagnetic remanence (9%) and coercive field (100 Oe) were similar to phase-pure Co:TiO? / LaAlO?. However, the presence of Co(0) under strongly oxidizing growth conditions known to oxidize the Si interface implies that under no deposition conditions can Co metal be eliminated while simultaneously protecting the Si interface from oxidation.

Kaspar, Tiffany C.; Droubay, Timothy C.; Wang, Chong M.; Heald, Steve M.; Lea, Alan S.; Chambers, Scott A.

2005-04-01T23:59:59.000Z

424

Non-conductive TiO2 as the anode catalyst support for PEM water electrolysis  

Science Journals Connector (OSTI)

The applicability of a non-conductive TiO2 as the support of the anodic catalyst for PEM water electrolysis was tested. Three TiO2 samples with different specific surface areas were modified by IrO2 using a modified version of the Adams fusion method. A constant weight ratio of IrO2/TiO2 of 0.6 was maintained in all cases. The size, specific surface area and morphology of IrO2 electrocatalyst crystallites were investigated by X-ray diffraction, nitrogen adsorption (BET) and scanning electron microscopy, respectively. The electron conductivity of compressed catalyst powders was evaluated. Their electrochemical properties were studied on a rotating disk electrode (RDE) and finally in a laboratory electrolyser. Utilization of the TiO2 support resulted in a reduction in the size of the IrO2 crystallites. It was found that the lower the specific surface area of the supports, the higher was the electrochemical activity of the catalyst. This is most likely due to the formation of a conductive IrO2 film on the surface of non-conductive supports. For the supports with a higher surface area, the amount of IrO2 used was not sufficient to form an adequately compact film. This resulted in high electron resistance of such a catalyst. The RDE results were confirmed by a laboratory electrolysis test. Taken together with the excellent stability of TiO2 in an anodic environment, these results suggest that these materials are promising supports if the appropriate amount of iridium is deposited.

Petr Mazúr; Jakub Polonský; Martin Paidar; Karel Bouzek

2012-01-01T23:59:59.000Z

425

Crystal structure and magnetic properties of Pr- and Ti-substituted La{sub 2}RuO{sub 5}  

SciTech Connect

Highlights: • Synthesis of polycrystalline Pr and Ti co-substituted La{sub 2}RuO{sub 5} with soft chemistry. • Investigation of structure–property relationship of the dimerization transition. • Additive behavior of structural changes caused by either Pr or Ti substitution. • Additive behavior of ht-phase paramagnetism of Pr and Ti substitution. • Additive influence of Pr and Ti substitution on the dimerization transition. - Abstract: Polycrystalline samples of Pr- and Ti-substituted La{sub 2}RuO{sub 5} were prepared applying a soft-chemistry route based on the thermal decomposition of citrate-stabilized precursors. The simultaneous substitution on the La-sites by Pr and on the Ru-sites by Ti results in samples of the composition La{sub 2?x}Pr{sub x}Ru{sub 1?y}Ti{sub y}O{sub 5} with 0 ? x ? 0.75 and 0 ? y ? 0.4. The crystal structures of these compounds were analyzed by Rietveld refinement of powder X-ray diffraction patterns. For pure La{sub 2}RuO{sub 5} a structural transition from a monoclinic room-temperature modification to a triclinic low-temperature structure was found at 161 K. This structural change is linked to a low-temperature long-range ordered spin-singlet ground state formed by Ru{sup 4+} spin-moments. Both the structural transition and the formation of the singlet ground state become progressively suppressed with higher Ti contents, while the Pr substitution has only a minor influence on the dimerization. The behavior of the Curie–Weiss temperatures can be explained assuming two almost independent magnetic sublattices corresponding to the ruthenium and the rare-earth ions, respectively. For all investigated properties, i.e. crystal structure, magnetic susceptibilities, and dimerization temperature T{sub d}, a completely additive behavior of the effects of Pr-substitution and Ti-substitution is observed.

Riegg, S., E-mail: stefan.riegg@physik.uni-augsburg.de [Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg (Germany); Loidl, A. [Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg (Germany); Reller, A. [Resource Strategy, University of Augsburg, D-86159 Augsburg (Germany); Ebbinghaus, S.G. [Solid State Chemistry, Martin-Luther University Halle-Wittenberg, D-06099 Halle (Germany)

2013-11-15T23:59:59.000Z

426

Formation of crystalline TiO{sub 2-x}N{sub x} and its photocatalytic activity  

SciTech Connect

Amorphous precursors to nitrogen-doped TiO{sub 2} (NTP) and pure TiO{sub 2} (ATP) powders were synthesized by hydrolytic synthesis and sol-gel method (SGM), respectively. Corresponding crystalline phases were obtained by thermally induced transformation of these amorphous powders. From FT-IR and XPS data, it was concluded that a complex containing titanium and ammonia was formed in the precipitate stage while calcination drove weakly adsorbed ammonium species off the surface, decomposed ammonia bound on surface of precipitated powder and led to substitution of nitrogen atom into the lattice of TiO{sub 2} during the crystallization. The activation energies required for grain growth in amorphous TiO{sub 2-x}N{sub x} and TiO{sub 2} samples were determined to be 1.6 and 1.7kJ/mol, respectively. Those required for the phase transformation from amorphous to crystalline TiO{sub 2-x}N{sub x} and TiO{sub 2} were determined to be 129 and 142kJ/mol, respectively. A relatively low temperature was required for the phase transformation in NTP sample than in ATP sample. The fabricated N-doped TiO{sub 2} photocatalyst absorbed the visible light showing two absorption edges; one in UV range due to titanium oxide as the main edge and the other due to nitrogen doping as a small shoulder. TiO{sub 2-x}N{sub x} photocatalyst demonstrated its photoactivity for photocurrent generation and decomposition of 2-propanol (IPA) under visible light irradiation ({lambda}>=420nm)

Jang, Jum Suk [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Kim, Hyun Gyu [Busan Center, Korea Basic Science Institute (KBSI), Busan, 609-735 (Korea, Republic of); Ji, Sang Min [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Bae, Sang Won [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of); Jung, Jong Hyeon [Division of Biotechnology and Health Engineering, Sorabol College, Gyeongju 780-711 (Korea, Republic of); Shon, Byung Hyun [Department of Environmental Engineering, Hanseo Unversity, Seosan 356-706 (Korea, Republic of); Lee, Jae Sung [Department of Chemical Engineering, Institute of Environmental and Energy Technology, School of Environmental and Science Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Korea, Republic of)]. E-mail: jlee@postech.ac.kr

2006-04-15T23:59:59.000Z

427

Nanocrystalline SiC and Ti3SiC2 Alloys for Reactor Materials: Diffusion of Fission Product Surrogates  

SciTech Connect

MAX phases, such as titanium silicon carbide (Ti3SiC2), have a unique combination of both metallic and ceramic properties, which make them attractive for potential nuclear applications. Ti3SiC2 has been suggested in the literature as a possible fuel cladding material. Prior to the application, it is necessary to investigate diffusivities of fission products in the ternary compound at elevated temperatures. This study attempts to obtain relevant data and make an initial assessment for Ti3SiC2. Ion implantation was used to introduce fission product surrogates (Ag and Cs) and a noble metal (Au) in Ti3SiC2, SiC, and a dual-phase nanocomposite of Ti3SiC2/SiC synthesized at PNNL. Thermal annealing and in-situ Rutherford backscattering spectrometry (RBS) were employed to study the diffusivity of the various implanted species in the materials. In-situ RBS study of Ti3SiC2 implanted with Au ions at various temperatures was also performed. The experimental results indicate that the implanted Ag in SiC is immobile up to the highest temperature (1273 K) applied in this study; in contrast, significant out-diffusion of both Ag and Au in MAX phase Ti3SiC2 occurs during ion implantation at 873 K. Cs in Ti3SiC2 is found to diffuse during post-irradiation annealing at 973 K, and noticeable Cs release from the sample is observed. This study may suggest caution in using Ti3SiC2 as a fuel cladding material for advanced nuclear reactors operating at very high temperatures. Further studies of the related materials are recommended.

Henager, Charles H.; Jiang, Weilin

2014-11-01T23:59:59.000Z

428

Characterization of ternary compounds in the BaO:Fe{sub 2}O{sub 3}:TiO{sub 2} system: Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} and BaFe{sub 11}Ti{sub 3}O{sub 23}  

SciTech Connect

Single crystals of Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} and BaFe{sub 11}Ti{sub 3}O{sub 23} were obtained as major and minor coproducts, respectively, by slow-cooling an off-stoichiometric BaO:Fe{sub 2}O{sub 3}:TiO{sub 2} melt. The former compound exhibits variable stoichiometry, Ba{sub 6}Fe{sub 48{minus}x}Ti{sub 14+x}O{sub 106}, with the Fe:Ti ratio dependent upon the partial pressure of oxygen. The value of x corresponds to the equivalents of reduction that occur to maintain electroneutrality as the Ti-content increases. When prepared in air, this phase occurs at x = 3 with the stoichiometry Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106}, while in 100% oxygen the x-value approaches zero with the resulting stoichiometry Ba{sub 6}Fe{sub 48}Ti{sub 14}O{sub 106} (all Fe{sup 3+} and Ti{sup 4+}). The structures of Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} and BaFe{sub 11}Ti{sub 3}O{sub 23} were solved using single-crystal X-ray diffraction methods. Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} was prepared in polycrystalline form, and further structural details, including accurate Fe/Ti occupancy factors, were determined by a combined refinement using neutron and synchrotron powder diffraction data. (Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106}: Space group C2/m (No 12); a = 19.390(1) {angstrom}, b = 20.260(1) {angstrom}, c = 10.076(1) {angstrom}, {beta} = 105.27(1){degree}; V = 3818.5(3) {angstrom}{sup 3}; Z = 2; {rho}{sub calc} = 5.08 g/cm{sup 3}. Ba{sub 6}Fe{sub 11}Ti{sub 3}O{sub 23}: Space group C2/c (No 15); a = 19.56(1) {angstrom}, b = 8.6614(7) {angstrom}, c = 10.120(1) {angstrom}, {beta} = 105.62(1){degree}; V = 1651.1(3) {angstrom}{sup 3}; Z = 4; {rho}{sub calc} = 5.08 g/cm{sup 3}.) The magnetic behavior of Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} above room temperature up to 1073 K was found to obey the Curie-Weiss law, which indicated a small effective magnetic moment (34 {mu}{sub B} per mole Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106}) and a large negative temperature intercept ({minus}806 K). Electrical resistivity measurements between room temperature and 120 K revealed nonmetallic behavior with an activation energy on the order of 0.17 eV. At 347 MHz under ambient conditions, Ba{sub 6}Fe{sub 45}Ti{sub 17}O{sub 106} exhibited a relative permittivity of 24 and a dielectric loss tangent of 0.10.

Vanderah, T.A.; Wong-Ng, W.; Toby, B.H.; Shull, R.D.; Roth, R.S. [National Inst. of Standards and Technology, Gaithersburg, MD (United States). Materials Science and Engineering Lab.] [National Inst. of Standards and Technology, Gaithersburg, MD (United States). Materials Science and Engineering Lab.; Browning, V.M. [Naval Research Lab., Washington, DC (United States)] [Naval Research Lab., Washington, DC (United States); Geyer, R.G. [National Inst. of Standards and Technology, Boulder, CO (United States)] [National Inst. of Standards and Technology, Boulder, CO (United States)

1999-03-01T23:59:59.000Z

429

Weakening C?O Bonds: Ti(III), a New Reagent for Alcohol Deoxygenation and Carbonyl Coupling Olefination  

Science Journals Connector (OSTI)

Thus, addition of only 0.5 equiv of Zn or Mn to a solution of 1 equiv of Cp2TiCl2 in THF at room temperature, after 5 min of stirring, caused the expected color change in the solution, which turned from red to green, thus confirming the reduction of the Ti(IV) species to Ti(III). ... This research was supported by the Spanish Ministry of Science and Innovation, Project CTQ2006-15575-C02-01. We also thank the “Centro de Servicios de Informática y Redes de Comunicaciones” (CSIRC), University of Granada, for allowing us to use its supercomputing facilities (UGRGrid). ...

Horacio R. Diéguez; Armando López; Victoriano Domingo; Jesús F. Arteaga; José A. Dobado; M. Mar Herrador; José F. Quílez del Moral; Alejandro F. Barrero

2009-12-11T23:59:59.000Z

430

Micro-Raman spectroscopic study of nanolaminated Ti{sub 5}Al{sub 2}C{sub 3}  

SciTech Connect

Micro-Raman spectroscopic study and lattice dynamics calculations were conducted to study a recently identified layered ternary carbide, Ti{sub 5}Al{sub 2}C{sub 3}. The experimental Raman shifts were remarkably consistent with the calculated values. Polarized Raman spectrum was collected in the polycrystalline sample, which confirmed the theoretical symmetry assignment of the Raman modes. In addition, the atomic vibrations of the peaks at 192?cm{sup ?1}, 311?cm{sup ?1}, and 660?cm{sup ?1} were identified to be the combination of the counterparts in Ti{sub 2}AlC and Ti{sub 3}AlC{sub 2}.

Zhang, H.; Li, Z. J. [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Wang, X. H. [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China); Xiang, H. M.; Zhou, Y. C, E-mail: yczhou714@gmail.com [Science and Technology of Advanced Functional Composite Laboratory, ARIMPT, No.1 South Dahongmen Road, Beijing 100076 (China)

2014-03-31T23:59:59.000Z

431

Investigation of thermonuclear $^{18}$Ne($?$,$p$)$^{21}$Na rate via resonant elastic scattering of $^{21}$Na+$p$  

E-Print Network (OSTI)

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the rp-process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus $^{22}$Mg have been investigated by measuring the resonant elastic scattering of $^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm$^2$ thick polyethylene (CH$_{2}$)$_{n}$ target. The $^{21}$Na beam intensity was about 2$\\times$10$^{5}$ pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of $\\theta_{c.m.}$$\\approx$175.2${^\\circ}$, 152.2${^\\circ}$, and 150.5${^\\circ}$ by three sets of $\\Delta E$-$E$ telescopes, respectively. The excitation function was obtained with the thick-target method over energies $E_x$($^{22}$Mg)=5.5--9.2 MeV. In total, 23 states above the proton-threshold in $^{22}$Mg were observed, and their resonant parameters were determined via an $R$-matrix analysis of the excitation functions. We have made several new $J^{\\pi}$ assignments and confirmed some tentative assignments made in previous work. The thermonuclear $^{18}$Ne($\\alpha$,$p$)$^{21}$Na rate has been recalculated based on our recommended spin-parity assignments. The astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the $^{18}$Ne($\\alpha$,$p$)$^{21}$Na rate significantly affects the peak nuclear energy generation rate, reaction fluxes, as well as the onset temperature of this breakout reaction in these astrophysical phenomena.

L. Y. Zhang; J. J. He; A. Parikh; S. W. Xu; H. Yamaguchi; D. Kahl; S. Kubono; P. Mohr; J. Hu; P. Ma; S. Z. Chen; Y. Wakabayashi; H. W. Wang; W. D. Tian; R. F. Chen; B. Guo; T. Hashimoto; Y. Togano; S. Hayakawa; T. Teranishi; N. Iwasa; T. Yamada; T. Komatsubara; Y. H. Zhang; X. H. Zhou

2014-03-19T23:59:59.000Z

432

Synthesis and nonlinear optical properties of BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals in glasses with high TiO{sub 2} contents  

SciTech Connect

The ternary BaO-TiO{sub 2}-B{sub 2}O{sub 3} glasses containing a large amount of TiO{sub 2} (20-40mol%) are prepared, and their optical basicities ({lambda}), the formation, structural features and second-order optical nonlinearities of BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals are examined to develop new nonlinear optical materials. It is found that the glasses with high TiO{sub 2} contents of 30-40mol% show large optical basicities of {lambda}=0.81-0.87, suggesting the high polarizabity of TiO{sub n} polyhedra (n=4-6) in the glasses. BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals are found to be formed as main crystalline phases in the glasses. It is found that BaTi(BO{sub 3}){sub 2} crystals tend to orient at the surface of crystallized glasses. The new XRD pattern for the Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} phase is proposed through Rietvelt analysis. The second harmonic intensities of crystallized glasses were found to be 0.8 times as large as {alpha}-quartz powders, i.e., I{sup 2{omega}}(sample)/I{sup 2{omega}}({alpha}-quartz)=0.8, for the sample with BaTi(BO{sub 3}){sub 2} crystals and to be I{sup 2{omega}}(sample)/I{sup 2{omega}}({alpha}-quartz)=68 for the sample with Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals. The Raman scattering spectra for these two crystalline phases are measured for the first time and their structural features are discussed.

Kosaka, Shinji [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Benino, Yasuhiko [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Fujiwara, Takumi [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Dimitrov, Vesselin [Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8 Kl, Ohridki Blvd., Sofia 1756 (Bulgaria); Komatsu, Takayuki [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan)]. E-mail: komatsu@chem.nagaokaut.ac.jp

2005-06-15T23:59:59.000Z

433

Velocity of Second Sound in NaF  

Science Journals Connector (OSTI)

The velocity of drifting second sound and the heat capacity per unit volume are calculated for NaF for temperatures from 0 to 40 °K. The velocity of second sound decreases by 24% as the temperature is increased from 10 to 30 °K, because of the dispersion of the phonon frequency spectrum.

Robert J. Hardy and S. S. Jaswal

1971-06-15T23:59:59.000Z

434

AMERINDIA n35, 2011 La nominalisation en kali'na  

E-Print Network (OSTI)

'na est une langue relativement bien connue grâce aux travaux de Hoff sur le Carib du Surinam (variété du origine commune. Par ailleurs, Hoff (2009) décrit, pour le Carib du Surinam, les constructions

Paris-Sud XI, Université de

435

BIOLOGICAL SAFETY O N/A Biosafety Cabinets  

E-Print Network (OSTI)

: _________________________________________________ _________________________________________________ _________________________________________________ RADIATION SAFETY O N/A ___RS-1 Radioactive Material Inventory / Use Logs out of date ___RS-2 Radioactive Material waste inventory cards improperly filled out ___RS-3 Stock radioactive material not secure ___RS-4 __Accelerator __PressureVessels __HiReactMaterials __Rad Material __PwIndV / __PwTools __>55g Oil __X

Entekhabi, Dara

436

Grant Title: STARR FOUNDATION Funding Opportunity Number: N/A  

E-Print Network (OSTI)

Grant Title: STARR FOUNDATION Funding Opportunity Number: N/A Agency/Department: Starr Foundation Grants Program. Area of Research: The foundation makes grants in the following areas: education, medicine and post-secondary schools. Grants for medicine and health care include capital grants to hospitals

Farritor, Shane

437

Exploring Neutron-Rich Oxygen Isotopes with MoNA  

E-Print Network (OSTI)

The Modular Neutron Array (MoNA) was used in conjunction with a large-gap dipole magnet (Sweeper) to measure neutron-unbound states in oxygen isotopes close to the neutron dripline. While no excited states were observed in 24O, a resonance at 45(2) keV above the neutron separation energy was observed in 23O.

N. Frank; T. Baumann; D. Bazin; J. Brown; P. A. DeYoung; J. E. Finck; A. Gade; J. Hinnefeld; R. Howes; J. -L. Lecouey; B. Luther; W. A. Peters; H. Scheit; A. Schiller; M. Thoennessen

2007-08-20T23:59:59.000Z

438

PS-wave moveout inversion for tilted TI media: A physical-modeling study Pawan Dewangan1  

E-Print Network (OSTI)

the effective medium formed by steeply dipping fracture sets or shale layers. The reflection moveout of PS by the parameter-estimation results. INTRODUCTION Transverse isotropy TI is a common anisotropic symmetry usu- ally

439

EFFECT OF AGING ON THE PHASE TRANSFORMATION AND MECHANICAL BEHAVIOR OF Ti36Ni49Hf15 HIGH  

E-Print Network (OSTI)

and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China (Received August 19 the microstructure, transformation temperature, mechanical properties and shape memory effects (SMEs) for Ti36Ni49Hf

Zheng, Yufeng

440

Untersuchungen an Hydriden im Bereich der Phase Ti2CO1—x Fe x (x=0–0,5)  

Science Journals Connector (OSTI)

The hydrogen absorption of the phase Ti64Co32?x Fe x (x=0...16) and its influence on the magnetic properties have been investigated. Measurements of the vapour-p...

Kurt Hiebl; Engelbert Tuscher; Helmut Bittner

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Growth of single-crystalline rutile TiO2 nanorods on fluorine-doped tin oxide glass for organicinorganic  

E-Print Network (OSTI)

, 15] and CdS [2] have been explored and studied to overcome this shortcome, and used in organicGrowth of single-crystalline rutile TiO2 nanorods on fluorine-doped tin oxide glass for organic

Cao, Guozhong

442

TiO2/graphene composite from thermal reaction of graphene oxide and its photocatalytic activity in visible light  

Science Journals Connector (OSTI)

In this study, the P25 TiO2 nanoparticles and graphene sheets (GSs) composite were prepared from a facile thermal reaction of graphene oxide. Its microstructures and photocatalytic properties were ... nm in the a...

Yupeng Zhang; Chunxu Pan

2011-04-01T23:59:59.000Z

443

TiO2-containing PVA/xylan composite films with enhanced mechanical properties, high hydrophobicity and UV shielding performance  

Science Journals Connector (OSTI)

The hydrophilicity/hydrophocbicity of TiO2-enchanced PVA/xylan composite films was performed with an OCA40 ... contact angle value was determined on each film surface at five different locations.

Junli Ren; Shuaiyang Wang; Cundian Gao; Xiaofeng Chen; Weiying Li; Feng Peng

2014-10-01T23:59:59.000Z

444

Catalytic epoxidation of propene with H2O-O2 reactants on Au/TiO2  

SciTech Connect

Au/TiO{sub 2} catalysts form hydroperoxy species from H{sub 2}O-O{sub 2} mixtures at near-ambient temperatures. These species can be used in the selective epoxidation of propene to propylene oxide.

Ojeda, Manuel; Iglesia, Enrique

2008-11-05T23:59:59.000Z

445

Dry etching properties of TiO2 thin films in O2/CF4/Ar plasma  

Science Journals Connector (OSTI)

In this work, the etching properties of titanium dioxide (TiO2) thin film in additions of O2 at CF4/Ar plasma were investigated. The maximum etch rate of 179.4 nm/min and selectivity of TiO2 of 0.6 were obtained at an O2/CF4/Ar (=3:16:4 sccm) gas mixing ratio. In addition, the etch rate and selectivity were measured as a function of the etching parameters, such as the RF power, DC-bias voltage, and process pressure. The efficient destruction of the oxide bonds by ion bombardment, which was produced from the chemical reaction of the etched TiO2 thin film, was investigated by X-ray photoelectron spectroscopy. To determine the re-deposition of sputter products and reorganization of such residues on the surface, the surface roughness of TiO2 thin film were examined using atomic force microscopy.

Kyung-Rok Choi; Jong-Chang Woo; Young-Hee Joo; Yoon-Soo Chun; Chang-Il Kim

2013-01-01T23:59:59.000Z

446

Interfacial oxygen under TiO{sub 2} supported Au clusters revealed by a genetic algorithm search  

SciTech Connect

We present a density functional theory study of the oxidation of 1D periodic rods supported along the [001] direction on the rutile TiO{sub 2}(110) surface. The study shows evidence for an oxidation of the interface between the supported Au and the TiO{sub 2} crystal. The added O atoms adsorb at the 5f-Ti atoms in the through under the Au rod and are stabilized by charge transfer from the nearest Au atoms. Despite an extensive search, we find no low energy barrier pathways for CO oxidation involving CO adsorbed on Au and O at the perimeter of the Au/TiO{sub 2} interface. This is in part attributed the weak adsorption of CO on cationic Au at the perimeter.

Vilhelmsen, Lasse B.; Hammer, Bjørk, E-mail: hammer@phys.au.dk [Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)] [Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)

2013-11-28T23:59:59.000Z

447

Atmospheric-Pressure Cold Plasma for Preparation of High Performance Pt/TiO2 Photocatalyst and Its Mechanism  

Science Journals Connector (OSTI)

Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to fabricate Pt/TiO2 photocatalyst using the mixture of Ar and H2 as working gas. X-ray photoelectron microscopy (XPS) and transmis...

Lanbo Di; Xiuling Zhang; Zhijian Xu; Kai Wang

2014-03-01T23:59:59.000Z

448

TiOx Films Deposited by Plasma Enhanced Chemical Vapour Deposition Method in Atmospheric Dielectric Barrier Discharge Plasma  

Science Journals Connector (OSTI)

The plasma enhanced chemical vapour deposition method applying atmospheric dielectric barrier discharge (ADBD) plasma was used for TiOx thin films deposition employing titanium (IV) isopropoxide and oxygen as rea...

Y. Klenko; J. Pichal

2012-12-01T23:59:59.000Z

449

TiO2-reduced graphene oxide nanocomposite for high-rate application of lithium ion batteries  

Science Journals Connector (OSTI)

TiO2-reduced graphene oxide nanocomposite has been synthesized by a...2 nanoparticle homogenously dispersed onto the reduced graphene oxide sheets. The electrochemistry performance has been...?1 at the rate of 10...

Chuchun Zheng; Chunhua He; Haiyan Zhang; Wenguang Wang; Xinling Lei

2014-06-01T23:59:59.000Z

450

Oxidative Degradation of BPA Using TiO2 in Water, and Transition of Estrogenic Activity in the Degradation Pathways  

Science Journals Connector (OSTI)

The oxidative degradation behavior of bisphenol A (BPA) using titanium dioxide (TiO2...) in water was investigated. The main purposes were to clarify the relationship with estrogenic activity from the degradation...

Kei Nomiyama; Teiji Tanizaki; Toyokazu Koga…

2007-01-01T23:59:59.000Z

451

Influence of anode area and electrode gap on the morphology of TiO2 nanotubes arrays  

Science Journals Connector (OSTI)

In order to fabricate the titanium dioxide (TiO2) nanotubes arrays which were used in the photocatalytic degradation of total volatile organic compounds (TVOC) by anodization, the influence of the electrode gap and anode area on the morphology ...

Min Wang; Li Jia; Shuangmei Deng

2013-01-01T23:59:59.000Z

452

Comparison of Nb/sub 3/Sn and NbTi superconductor magnet ITER (International Thermonuclear Experimental Reactor) devices  

SciTech Connect

The TETRA tokamak systems code is used to compare designs for the International Thermonuclear Experimental Reactor (ITER) that use Nb/sub 3/Sn and NbTi superconductor magnets. Similar minimum-cost devices are found with both types of conductors when superfluid helium (He-2) is used in conjunction with the NbTi. The cost of using NbTi with He-1 cooling is much higher than that of using Nb/sub 3/Sn or NbTi with He-2 cooling. Generally, the minimum-cost devices occur for peak fields at the toroidal field coil of about 11.5-13 T, depending on the physics requirements. Sensitivities to the allowable stress level indicate strong cost increases when the stress is reduced from the nominal 600-MPa level and weaker cost benefits when the stress is allowed to reach higher levels. 8 refs., 5 figs., 1 tab.

Galambos, J.D.; Peng, Y.K.M.; Reid, R.L.; Lubell, M.S.; Dresner, L.; Miller, J.R.

1988-01-01T23:59:59.000Z

453

Ion engineering techniques for the preparation of the highly effective TiO2 photocatalysts operating under visible light irradiation  

Science Journals Connector (OSTI)

The successful application of ion engineering techniques for the development of TiO2...photocatalysts operating under visible and/or solar light irradiations has been summarized in this review article. First, we ...

Masato Takeuchi; Masaya Matsuoka; Masakazu Anpo

2012-04-01T23:59:59.000Z

454

Low-Temperature Synthesis of Anatase TiO[subscript 2] Nanoparticles with Tunable Surface Charges for Enhancing Photocatalytic Activity  

E-Print Network (OSTI)

In this work, the positively or negatively charged anatase TiO[subscript 2] nanoparticles were synthesized via a low temperature precipitation-peptization process (LTPPP) in the presence of poly(ethyleneimine) (PEI) and ...

Li, Ye

455

Electronic and optical proeprties of neon-doped rutile TiO2 from ab inito calculations  

Science Journals Connector (OSTI)

The electronic-structure and optical properties of neon-doped rutile TiO2 have been investigated using density functional theory with Slater type orbitals basis set and correlation. This was done using the PBE me...

Aqeel M. Ali

2012-04-01T23:59:59.000Z

456

Low-Temperature Desorption of N2O from NO on Rutile TiO2(110...  

NLE Websites -- All DOE Office Websites (Extended Search)

decreases rapidly as the initially clean, reduced TiO2(110) surface with 5% oxygen vacancies (VO’s) becomes covered with oxygen adatoms and unreacted NO. The maximum...

457

A Study of Strain-Induced Phase Transformations in TiNi Alloy by Electric Resistance Method  

Science Journals Connector (OSTI)

It is generally recognized that the shape memory effect (SME) is associated the interaction of stress with thermoelastic martensitic transformation [1]. The phase transformations in TiNi alloy was reported to occ...

Yuan-Ti Muang; Li-Lin Lu; Lai-Zhi Zou…

1988-01-01T23:59:59.000Z

458

Electronic band alignment and electron transport in Cr/BaTiO{sub 3}/Pt ferroelectric tunnel junctions  

SciTech Connect

Electroresistance in ferroelectric tunnel junctions is controlled by changes in the electrostatic potential profile across the junction upon polarization reversal of the ultrathin ferroelectric barrier layer. Here, hard X-ray photoemission spectroscopy is used to reconstruct the electric potential barrier profile in as-grown Cr/BaTiO{sub 3}(001)/Pt(001) heterostructures. Transport properties of Cr/BaTiO{sub 3}/Pt junctions with a sub-{mu}m Cr top electrode are interpreted in terms of tunneling electroresistance with resistance changes of a factor of {approx}30 upon polarization reversal. By fitting the I-V characteristics with the model employing an experimentally determined electric potential barrier we derive the step height changes at the BaTiO{sub 3}/Pt (Cr/BaTiO{sub 3}) interface +0.42(-0.03) eV following downward to upward polarization reversal.

Zenkevich, A. [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation) [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation); Minnekaev, M.; Matveyev, Yu.; Lebedinskii, Yu. [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation)] [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation); Bulakh, K.; Chouprik, A.; Baturin, A. [Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation)] [Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation); Maksimova, K. [Immanuel Kant Baltic Federal University, 236041 Kaliningrad (Russian Federation)] [Immanuel Kant Baltic Federal University, 236041 Kaliningrad (Russian Federation); Thiess, S.; Drube, W. [Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)] [Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)

2013-02-11T23:59:59.000Z

459

Influence of Metal (Au, Ag) Micro-Grid on the Photocatalytic Activity of TiO2 Film  

Science Journals Connector (OSTI)

In this paper, we prepared TiO2...thin film with the surface modified by a connected Au micro-grid via a microsphere lithography strategy, and the...2 film. The photocatalytic activity improved as Au loading incr...

Chao Cai; Junying Zhang; Feng Pan; Weiwei Zhang; Hailing Zhu…

2008-06-01T23:59:59.000Z

460

Short-range order, atomic displacements and effective interatomic ordering energies in TiN0.82 (*)  

E-Print Network (OSTI)

N, and then decreases for x > 1 [1]. In transition metal carbides and nitrides, vacancies are not randomly://dx.doi.org/10.1051/jphys:0198900500160221700 #12;2218 1. Introduction. Titanium mononitride TiNx is a metallic

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

A STUDY ON SOLUTION (THM) GROWN TI DOPED CdTe F. V. WALD and R. O. BELL  

E-Print Network (OSTI)

203 A STUDY ON SOLUTION (THM) GROWN TI DOPED CdTe F. V. WALD and R. O. BELL Mobil Tyco Solar Energy might, perhaps, expect somewhat different results. The growth was carried out by THM [3] with a furnace

Boyer, Edmond

462

X-ray Microdiffraction from ?-Ti0.04Fe1.96O3 (0001) Epitaxial...  

NLE Websites -- All DOE Office Websites (Extended Search)

(0001) Epitaxial Film Grown Over ?-Cr2O3 Buffer Layer Boundary. X-ray Microdiffraction from ?-Ti0.04Fe1.96O3 (0001) Epitaxial Film Grown Over...

463

Properties of two-phase intermetallic (Ti, Nb){sub 3} (Al, Si) + (Ti, Nb){sub 5} (Si, Al){sub 3} P/M bulk and sheet material  

SciTech Connect

Intermetallic Ti-based alloy powder with nominal composition Ti 23.5Al5.5Si 10 Nb(at.%) was produced by argon gas atomization. This dual phase alloy is composed of the {alpha}{sub 2}-(Ti, Nb){sub 3} (Al,Si)-matrix phase and a eutectic mixture of {alpha}{sub 2}-(Ti, Nb){sub 3}(Al, Si) + {xi}-(Ti, Nb){sub 5} (Si, Al){sub 3}. The powder was compacted by hot isostatic pressing, subsequently hot rolled into sheets, and heat treated. The microstructures of the HIPed compacts and of the sheet materials were metallographically characterized and correlated with tensile properties at temperatures between 20 and 1,000 C. Due to networks of the brittle {xi}-silicide phase, the HIPed state showed no ductility at 20 C. Break-down of the silicide network during rolling led to an improved ductility at 20 C. After post rolling annealing, the yield strengths at 20 and 700 C were between 750--490 MPa and 700--420 MPa for specimens taken parallel and perpendicular to the rolling direction, respectively. These values are considerably higher than those reported for {gamma}-TiAl sheets. At 1,000 C the sheet material could be superplastically deformed.

Gerling, R.; Oehring, M.; Schimansky, F.P. [GKSS-Forschungszentrum, Geesthacht (Germany)] [GKSS-Forschungszentrum, Geesthacht (Germany); Bartels, A. [TU Hamburg-Harburg (Germany)] [TU Hamburg-Harburg (Germany); Clemens, H. [Plansee Aktiengesellschaft, Reutte (Austria). Technology Center] [Plansee Aktiengesellschaft, Reutte (Austria). Technology Center

1997-10-01T23:59:59.000Z

464

Adsorption and Reaction of CO and CO{sub 2} on Oxidized and Reduced SrTiO{sub 3} (100) Surfaces  

SciTech Connect

The adsorption and reaction of CO and CO{sub 2} on oxidized and reduced SrTiO{sub 3}(100) surfaces have been studied using temperature programmed desorption (TPD) and x-ray photoelectron spectroscopy (XPS). XPS results indicate that the fully oxidized and vacuum annealed SrTiO{sub 3}(100) surfaces are nearly defect-free with predominantly Ti{sup 4+} ions whereas the sputter-reduced surfaces contain substantial amounts of defects ({approx} 40% reduced Ti sites). Both CO and CO{sub 2} are found to adsorb weakly on the oxidized SrTiO{sub 3}(100) surfaces. The desorption activation energies of CO and CO{sub 2} from the oxidized SrTiO{sub 3}(100) surfaces are 38 and 32 kJmol{sup -1}, respectively, following adsorption at 110 K. On sputter-reduced surfaces, enhanced reactivity of CO and CO{sub 2} is observed due to the presence of oxygen vacancy sites, causing dissociative adsorption of these molecules. Our studies indicate that CO and CO{sub 2} molecules exhibit relatively weaker binding to SrTiO{sub 3}(100) compared with TiO{sub 2}(110) and TiO{sub 2}(100) surfaces. These differences in reactivity can be attributed primarily to the influence of the Sr cations on the electronic structure of the mixed oxide of SrTiO{sub 3}.

Azad, Samina; Engelhard, Mark H.; Wang, Li Q.

2005-05-26T23:59:59.000Z

465

Probing Defect Sites on TiO_2 with H_3 Re_3 (CO)_12 : Spectroscopic Characterization of the Surface Species  

SciTech Connect

Samples of the anatase phase of titania were treated under vacuum to create Ti3+ surface-defect sites and surface O- and O2- species (indicated by electron paramagnetic resonance (EPR) spectra), accompanied by the disappearance of bridging surface OH groups and the formation of terminal Ti3+OH groups (indicated by IR spectra). EPR spectra showed that the probe molecule [Re3(CO)12H3] reacted preferentially with the Ti3+ sites, forming Ti4+ sites with OH groups as the [Re3(CO)12H3] was adsorbed. Extended X-ray absorption fine structure (EXAFS) spectra showed that these clusters were deprotonated upon adsorption, with the triangular metal frame remaining intact; EPR spectra demonstrated the simultaneous removal of surface O- and O2- species. The data determined by the three complementary techniques form the basis of a schematic representation of the surface chemistry. According to this picture, during evacuation at 773 K, defect sites are formed on hydroxylated titania as a bridging OH group is removed, forming two neighboring Ti3+ sites, or, when a Ti4+O bond is cleaved, forming a Ti3+ site and an O- species, with the Ti4+OH group being converted into a Ti3+OH group. When the probe molecule [Re3(CO)12H3] is adsorbed on a titania surface with Ti3+ defect sites, it reacts preferentially with these sites, becoming deprotonated, removing most of the oxygen radicals, and healing the defect sites.

Suriye,K.; Lobo-Lapidus, R.; Yeagle, G.; Praserthdam, P.; Britt, R.; Gates, B.

2008-01-01T23:59:59.000Z

466

Investigation of thermonuclear $^{18}$Ne($\\alpha$,$p$)$^{21}$Na rate via resonant elastic scattering of $^{21}$Na+$p$  

E-Print Network (OSTI)

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the rp-process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus $^{22}$Mg have been investigated by measuring the resonant elastic scattering of $^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm$^2$ thick polyethylene (CH$_{2}$)$_{n}$ target. The $^{21}$Na beam intensity was about 2$\\times$10$^{5}$ pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of $\\theta_{c.m.}$$\\approx$175.2${^\\circ}$, 152.2${^\\circ}$, and 150.5${^\\circ}$ by three sets of $\\Delta E$-$E$ telescopes, respectively. The excitation function was obtained with the thick-target method over energies $E_x$($^{22}$Mg)=5.5--9.2 MeV. In total, 23 states above the proton-threshold in $^{22}$Mg were observed, and their resonant parameters were determ...

Zhang, L Y; Parikh, A; Xu, S W; Yamaguchi, H; Kahl, D; Kubono, S; Mohr, P; Hu, J; Ma, P; Chen, S Z; Wakabayashi, Y; Wang, H W; Tian, W D; Chen, R F; Guo, B; Hashimoto, T; Togano, Y; Hayakawa, S; Teranishi, T; Iwasa, N; Yamada, T; Komatsubara, T; Zhang, Y H; Zhou, X H

2014-01-01T23:59:59.000Z

467

Thermal stability of the endohedral fullerenes NaC60, NaC70, and PaC60  

Science Journals Connector (OSTI)

Nitrogen and phosphorus atoms enclosed in fullerenes keep their atomic ground-state configuration, and no charge transfer or covalent bonding to the cage occurs. These systems can be dissolved in organic solvents and reacted with addends without losing the atomic character of the guest atom. In this paper, we present a detailed study of the annealing behavior of NaC60, NaC70, PaC60, and of some NaC60 adducts. The disintegration of these systems, as recorded by electron paramagnetic resonance measurements, occurs in the temperature range between 400 K and 600 K. The results are in qualitative agreement with potential energy calculations and confirm the proposed escape mechanism that proceeds via bond formation of the trapped atom with the cage. It is found that other combinations of group-V elements with fullerenes, e.g., NaC84, PaC70, and AsaC60 are not stable at room temperature. The escape mechanism and the possibility of disabling this path are discussed.

M. Waiblinger; K. Lips; W. Harneit; A. Weidinger; E. Dietel; A. Hirsch

2001-01-09T23:59:59.000Z

468

Physisorption of N2, O2, and CO on Fully Oxidized TiO2(110)  

SciTech Connect

Physisorption of N2, O2 and CO was studied on fully oxidized TiO2(110) using beam reflection and temperature programmed desorption (TPD) techniques. Sticking coefficients for all three molecules are nearly equal (0.75 ± 0.05) and approximately independent of coverage suggesting that adsorption occurs via a precursor mediated mechanism. Excluding multilayer coverages, the TPD spectra for all three adsorbates exhibit three distinct coverage regimes that can be interpreted in accord with previous theoretical studies of N2 adsorption. At low coverages (0 to 0.5 N2/Ti4+), N2 molecules bind head-on to five-coordinated Ti4+ ions. The adsorption occurs preferentially on the Ti4+ sites that do not have neighboring adsorbates. This arrangement minimizes the repulsive interactions between the adsorbed molecules along the Ti4+ rows resulting in a relatively small shift of the TPD peak (105 ? 90 K) with increasing coverage. At higher N2 coverages (0 to 1.0 N2/Ti4+) the nearest-neighbor Ti4+ sites become occupied. The close proximity of the adsorbates results in strong repulsion thus giving rise to a significant shift of the TPD leading edges (90 ? 45 K) with increasing coverage. For N2/Ti4+ > 1, an additional low temperature peak (~ 43 K) is present and is ascribed to N2 adsorption on bridge-bonded oxygen rows. The results for O2 and CO are qualitatively similar. The repulsive adsorbate-adsorbate interactions largest for CO, most likely due to aligned CO dipole moments. The coverage dependent binding energies of O2, N2, and CO are determined by inverting TPD profiles.

Dohnalek, Zdenek; Kim, Jooho; Bondarchuk, Oleksander A.; White, J. M.; Kay, Bruce D.

2006-03-30T23:59:59.000Z

469

Physicochemical characteristics of Ti-PILC as a catalyst support for the reduction of NO by NH3  

Science Journals Connector (OSTI)

A pillared interlayered clay (PILC) intercalated by titania has been prepared as a catalyst support in an attempt to overcome the drawbacks of titania. The morphological, thermal, and surface properties of Ti-PILC have been particularly examined to use as a support for a NO SCR catalyst. The Ti-PILC prepared here was found to exhibit higher surface area and stronger acidity and thermal stability than the titania used as a common catalyst support.

Ho Jeong Chae; In-Sik Nam; Suk Bong Hong

2003-01-01T23:59:59.000Z

470

Preparation of Pt deposited nanotubular TiO{sub 2} as cathodes for enhanced photoelectrochemical hydrogen production using seawater electrolytes  

SciTech Connect

The purpose of this study was to develop effective cathodes to increase the production of hydrogen and use the seawater, an abundant resource in the earth as the electrolyte in photoelectrochemical systems. In order to fabricate the Pt/TiO{sub 2} cathodes, various contents of the Pt precursor (0-0.4 wt%) deposited by the electrodeposition method were used. On the basis of the hydrogen evolution rate, 0.2 wt% Pt/TiO{sub 2} was observed to exhibit the best performance among the various Pt/TiO{sub 2} cathodes with the natural seawater and two concentrated seawater electrolytes obtained from single (nanofiltration) and combined membrane (nanofiltration and reverse osmosis) processes. The surface characterizations exhibited that crystal structures and morphological properties of Pt and TiO{sub 2} found the results of XRD pattern and SEM/TEM images, respectively. - Graphical abstract: On the basis of photoelectrochemical hydrogen production, 0.2 wt% Pt/TiO{sub 2} was observed to exhibit the best performance among the various Pt/TIO{sub 2} cathodes with natural seawater. In comparison of hydrogen evolution rate with various seawater electrolytes, 0.2 wt% Pt/TiO{sub 2} was found to show the better performance as cathode with the concentrated seawater electrolytes obtained from membrane. Highlights: > Pt deposited TiO{sub 2} electrodes are used as cathode in PEC H{sub 2} production. > Natural and concentrated seawater by membranes are used as electrolytes in PEC. > Pt/TiO{sub 2} shows a good performance as cathode with seawater electrolytes. > H{sub 2} evolution rate increases with more concentrated seawater electrolyte. > Highly saline seawater is useful resource for H{sub 2} production.

Nam, Wonsik [Korea Institute of Energy Research, New and Renewable Energy Research Division, Hydrogen Energy Research Center, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of); Korea University of Technology and Education, Department of Applied Chemical Engineering, 1800 Chungjeollo, Byeongcheon-myun, Chungnam 330-708 (Korea, Republic of); Oh, Seichang [Korea Institute of Energy Research, New and Renewable Energy Research Division, Hydrogen Energy Research Center, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of); Yonsei University, Department of Chemical and Biomolecular Engineering, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea, Republic of); Joo, Hyunku [Korea Institute of Energy Research, New and Renewable Energy Research Division, Hydrogen Energy Research Center, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of); Yoon, Jaekyung, E-mail: jyoon@kier.re.kr [Korea Institute of Energy Research, New and Renewable Energy Research Division, Hydrogen Energy Research Center, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of)

2011-11-15T23:59:59.000Z

471

Corrosion inhibitor storage and release property of TiO{sub 2} nanotube powder synthesized by rapid breakdown anodization method  

SciTech Connect

Graphical abstract: Display Omitted Highlights: ? TiO{sub 2} nanotube powders were synthesized by rapid breakdown anodization method. ? Benzotriazole was loaded into the TiO{sub 2} nanotube powders. ? Low pH induced release of benzotriazole from TiO{sub 2} nanotube powders was proved. -- Abstract: Titanium dioxide (TiO{sub 2}) is one of the most studied substances in material science due to its versatile properties and diverse applications. In this study titanium dioxide nanotube powder were synthesized by rapid breakdown anodization (RBA) method. The synthesis involved potentiostatic anodization of titanium foil in 0.1 M HClO{sub 4} electrolyte under an applied voltage of 20 V and rapid stirring. The morphology and the phase of titanium dioxide nanotube powder were studied using field emission scanning electron microscopy, laser Raman spectroscopy and high resolution transmission electron microscopy. Benzotriazole was chosen as model inhibitor to evaluate TiO{sub 2} nanotube powder's corrosion inhibitor loading and releasing properties. The storage and release properties of TiO{sub 2} nanotube powder were studied using UV–visible spectroscopy and thermogravimetric analysis.

Arunchandran, C.; Ramya, S.; George, R.P. [Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)] [Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India); Kamachi Mudali, U., E-mail: kamachi@igcar.gov.in [Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India)

2013-02-15T23:59:59.000Z

472

Band structure engineering of anatase TiO{sub 2} by metal-assisted P-O coupling  

SciTech Connect

In this work, we demonstrate that the metal-assisted P-O coupling is an effective approach to improve the photoelectrochemical properties of TiO{sub 2}. The (Sc + P) and (In + P) codoping effects on electronic structures and photocatalytic activities of anatase TiO{sub 2} are examined by performing hybrid density functional theory calculations. It is found that the coupling of P dopant with the second-nearest neighboring O atom assisted by acceptor metals (Sc/In) leads to the fully occupied and delocalized intermediate bands within the band gap of anatase TiO{sub 2}, which is driven by the P-O antibonding states (?*). This metal-assisted P-O coupling can prevent the recombination of photogenerated electron-hole pairs and effectively reduce the band gap of TiO{sub 2}. Moreover, the band edge alignments in (Sc + P) and (In + P) codoped anatase TiO{sub 2} are desirable for water-splitting. The calculated optical absorption curves indicate that (Sc + P) and (In + P) codoping in anatase TiO{sub 2} can also effectively enhance the visible light absorption.

Wang, Jiajun; Meng, Qiangqiang [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China)] [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Huang, Jing [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601 (China); Li, Qunxiang, E-mail: liqun@ustc.edu.cn; Yang, Jinlong [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026 (China); Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2014-05-07T23:59:59.000Z

473

Effect of Ti seed layers on structure of self-organized epitaxial face-centered-cubic-Ag(001) oriented nanodots  

SciTech Connect

The influence of Ti seed layers on the structure of self-organized Ag nanodots, obtained with a Ti seed-layer-assisted thermal agglomeration method, has been investigated. The samples were grown on MgO(001) single crystal substrates by RF magnetron sputter deposition. The samples were deposited at room temperature and post-annealed at 350 °C for 4 h while maintaining the chamber vacuum conditions. The results of atomic force microscopy (AFM) observations indicated that the insertion of the Ti seed layer (0.6–5.0 nm) between the MgO substrate and Ag layer promotes the agglomeration process, forming the nanodot array. Comparisons between the AFM images revealed that the size of the Ag nanodots was increased with an increase in the Ti seed layer thickness. The atomic concentration of the film surface was confirmed by X-ray photoelectron spectroscopy (XPS). The XPS result suggested that the nanodot surface mainly consisted of Ag. Moreover, X-ray diffraction results proved that the initial deposition of the Ti seed layer (0.6–5.0 nm) onto MgO(001) prior to the Ag deposition yielded high-quality fcc-Ag(001) oriented epitaxial nanodots. The optical absorbance spectra of the fabricated Ag nanodots with various Ti seed layer thicknesses were obtained in the visible light range.

Kamiko, M.; Nose, K. [Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)] [Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan); Suenaga, R.; Kyuno, K. [Department of Material Science, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548 (Japan)] [Department of Material Science, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548 (Japan); Koo, J.-W.; Ha, J.-G. [Department of Electronic Materials Engineering, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of)] [Department of Electronic Materials Engineering, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of)

2013-12-28T23:59:59.000Z

474

Effect of boundary scattering on the thermal conductivity of TiNiSn-based half-Heusler alloys  

Science Journals Connector (OSTI)

TiNiSn-based half-Heusler alloys have been of significant interest for their potential as thermoelectric materials. They exhibit promising electronic transport properties as revealed through high Seebeck coefficient and moderate electrical resistivity values. The chief disadvantage of these materials is a comparatively high lattice thermal conductivity. Attempts to “tune” the lattice thermal conductivity (?L) in these materials have led to the comparison and analysis of the thermal conductivity of two series of Ti- and Zr-based half-Heusler alloys. In the first series, Ti1?yZryNiSn0.95Sb0.05, a significant reduction in ?L is observed, with the substitution of large concentrations of Zr (y?25%) at Ti site, which is most likely due to mass fluctuation scattering. In the second series, TiNiSn1?xSbx, a nonsystematic increase in ?L is observed, with minute amounts of Sb doping (x?5%) at the Sn site. Extensive microstructural analysis in a TiNiSn1?xSbx series reveals a correlation between ?L and the average grain diameter in these materials, which is in good agreement with theoretical predictions related to phonon boundary scattering. In addition, a comparison of the calculated phonon mean free path in each of the series of compounds shows some insight into the two different phonon scattering mechanisms.

S. Bhattacharya; M. J. Skove; M. Russell; T. M. Tritt; Y. Xia; V. Ponnambalam; S. J. Poon; N. Thadhani

2008-05-30T23:59:59.000Z

475

Influence of O2-induced surface roughening on the chemistry of water on TiO2(110)  

SciTech Connect

The impact of oxygen induced regrowth of TiO2 on the reduced rutile TiO2(110) surface has been studied using temperature programmed desorption (TPD) of adsorbed water multilayers. Pre-exposure of UHV annealed TiO2(110) surfaces to O2 at temperatures from 300 to 850 K induced changes in subsequent water TPDs that were interpreted in terms of the rougher surface morphologies resulting from the regrowth process. Water TPD from TiO2(110) previously oxidized at 300 K exhibited a new peak at *312 K due to reaction of water with O adatoms. These O adatoms were produced by dissociative adsorption of O2 at O-vacancy sites. Additionally, oxygen reacted (slowly) with surface Ti2O3 strands at RT. Water TPD from surfaces pre-oxidized at higher temperatures (P500 K) exhibited features reflective of desorption from rough surfaces, namely loss of peak resolution and eventual merger of the second layer and ice peaks, formation of a high temperature tail on the second layer peak, and broadening of the first layer TPD peak. The multiplicity of kinetically different adsorption sites on the roughened TiO2(110) surfaces contributed to the widening of the desorption features. Published by Elsevier B.V.

Zehr, Robert T.; Henderson, Michael A.

2008-04-15T23:59:59.000Z

476

Ab-initio study of hydrogen doping and oxygen vacancy at anatase TiO{sub 2} surface  

SciTech Connect

Density functional–pseudopotential calculations were performed to study the effects of hydrogen doping and oxygen vacancy, both individually and together, on the electronic structure and stability of (001) surface of TiO{sub 2} in the anatase phase. Based on our calculations, O/Ti termination is the most stable one, and it appears that p-states of deep and surface O atoms and d-orbitals of surface Ti atoms have roles in the valence band and, the conduction band comes from the d-orbitals of deep Ti atoms. Although, no considerable change was seen during H doping, a mid-gap state appeared below the conduction band in the O vacancy configuration. In the framework of ab-initio atomistic thermodynamics, we argue that the anatase TiO{sub 2} prefers a defected O layer termination in the [001] direction. The obtained electronic structures indicate that H doping in the bulk creates the empty mid-gap state below the conduction band and hence decreases the band gap of the system. This phenomenon may explain the enhanced photocatalytic activity of the anatase TiO{sub 2} (001) surface after hydrogenation.

Sotoudeh, M.; Mohammadizadeh, M. R., E-mail: zadeh@ut.ac.ir [Superconductivity Research Laboratory (SRL), Department of Physics, University of Tehran, North Kargar Ave., P.O. Box 14395-547, Tehran (Iran, Islamic Republic of); Hashemifar, S. J. [Departement of Physics, Isfahan University of Technology, 84156 83111, Isfahan (Iran, Islamic Republic of)] [Departement of Physics, Isfahan University of Technology, 84156 83111, Isfahan (Iran, Islamic Republic of); Abbasnejad, M. [Department of Physics, Shahid Bahonar University of Kerman, Kerman (Iran, Islamic Republic of)] [Department of Physics, Shahid Bahonar University of Kerman, Kerman (Iran, Islamic Republic of)

2014-02-15T23:59:59.000Z

477

Synthesis of nanostructured multiphase (Ti,Al)N/a-Si3N4 thin films using dense plasma focus device  

Science Journals Connector (OSTI)

A 2.3 kJ pulsed plasma focus device was used to prepare thin films of nc-(Ti,Al)N/a-Si3N4 at room temperature. The plasma focus device, fitted with copper anode encapsulated with Ti0.5Al0.5 anode, was operated with nitrogen as the filling gas. Films were deposited with various number of focus shots, at 90 mm from top of the anode and at zero angular position with respect to anode axis. XRD patterns show the growth of polycrystalline (Ti,Al)N thin films with orientations in the (1 1 1), (2 0 0), (2 2 0) and (3 1 1) crystallographic planes. Behavior of lattice constant, grain size and film roughness of deposited film as a function of variation in number of focus shots is discussed. SEM micrographs of film deposited with 15 number of focus shots exhibit well-developed net like structure of nc-(Ti,Al)N/a-Si3N4 and possibly nc-(Ti,Al)N/a-Si3N4/a-AlN or nc-TiN/a-Si3N4/a-AlN. Surface Roughness ranging 64 nm to 89 nm was also observed.

Tousif Hussain; R. Ahmad; Nida Khalid; Z.A. Umar; A. Hussnain

2011-01-01T23:59:59.000Z

478

L NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY V.0. DEPARTMENT OF  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY V.0. DEPARTMENT OF Albany, OR .Morgantown, WV s Plllsburgh, PA @ENERGY Januaty 27,201 1 MEMORANDUM FOR MAXI( J. MATARRESE DIRECTOR, OFFICE OF ENVIRONMENT, SECURITY, SAFETY AND HEALTH l c ? FROM: \ DIVISION SUBJECT: Amual Natioilal Enviro~l~neiltal Policy Act (NEPA) Planning Summary for 2011 The attached documents conlprise the 201 1 Allnual NEPA Planning Summary for the National Enexgy TechnologyLaboratory. The infoimation is presented according to the guidance and fonnats provided by DOE'SNEPA office. As required by the Order 451.1B, the Annual NEPA Pla~lning Siimmary will be made available to the public. Please contact nte for any additional info~.mation regarding r\lETL,'s NEPA plans. Distribution: A. Chlgini

479

U.S. DEPARTMENT OF ENERGY EERE PROJECT MA.i\IAGE\tiE~TCE~TER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MA.i\IAGE\tiE~TCE~TER MA.i\IAGE\tiE~TCE~TER NEPA DETERMINATION Page 1 of2 RECIPIENT:Brayton Energy STATE: MA PROJECT TITLE: High-Efficiency Low-Cost Solar Receiver for use in a Supercritical C02 Recompression Cycle Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number DE-FOA-0000595 DE-EE0005799 GF0-0005799-{)01 G05799 Based on my review of the information concerning the proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.1A), I have made the foUowing determination: CX, EA, EIS APPENDIX AND NUMBER: Description: A9 Information gathering, analysis, and dissemination Information gathering (including, 'but not limited to, literature surveys, inventories, site vrsits, and audits}, data analysis (including, but not limited to, computer modeling}, document preparation

480

Surface characterization and mechanical property evaluation of thermally oxidized Ti-6Al-4V  

SciTech Connect

The present study concerns development of a thin and adherent oxide film on the surface of Ti-6Al-4V by thermal oxidation. Thermal oxidation was carried out over a range of temperature between 400 to 600 deg. C and a time from 25 h to 60 h. A detailed characterization of the surface and cross section of the oxidized surface was carried out by optical/scanning electron microscopy and X-ray diffraction techniques. Finally, the mechanical properties of the oxidized surface in terms of microindentation hardness and wear resistance were evaluated as a function of oxidation parameters. Surface oxidation of Ti-6Al-4V at 600 deg. C for 36 h offered a defect free oxide scale with improved hardness and wear resistance.

Biswas, Amit [Department of Metal. and Maters. Engg., I. I. T. Kharagpur, W. B. - 721302 (India); Dutta Majumdar, Jyotsna, E-mail: jyotsna@metal.iitkgp.ernet.in [Department of Metal. and Maters. Engg., I. I. T. Kharagpur, W. B. - 721302 (India)

2009-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "na ti ona" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Aggregated TiO2 Based Nanotubes for Dye Sensitized Solar Cells  

SciTech Connect

One-dimensional (1D) semiconducting oxides have attracted great attention for dye sensitized solar cells (DSCs), but the overall performance is still quite limited as compared to TiO2 nanocrystalline DSCs. Here, we report the synthesis of aggregated TiO2 based nanotubes with controlled morphologies and crystalline structures to obtain an overall power conversion efficiency of 9.9% using conventional dye without any additional chemical treatment steps. The high efficiency is attributed to the unique aggregate structure for light harvesting, optimized high surface area, and good crystallinity of the nanotube aggregates obtained through proper thermal annealing. This study demonstrates that high efficiency DSCs can be obtained with 1D nanomaterials, and provides lessons on the importance of optimizing both the nanocrystalline structure and the overall microscale morphology.

Nie, Zimin; Zhou, Xiaoyuan; Zhang, Qifeng; Cao, Guozhong; Liu, Jun

2013-11-01T23:59:59.000Z

482

Composition, morphology and mechanical properties of sputtered TiAlN coating  

SciTech Connect

TiAlN coating was deposited on the tungsten carbide cutting tool by using DC magnetron sputtering system to study the influence of substrate bias and nitrogen flow rate on the composition, morphology and mechanical properties. The negatively substrate bias and nitrogen flow rate was varied from about ?79 to ?221 V and 30 sccm to 72 sccm, respectively. The coating composition and roughness were characterized by using SEM/EDX and Atomic Force Microscopy (AFM), respectively. The dynamic ultra micro hardness tester was used to measure the mechanical properties. The coating hardness increases to about 10-12 GPa with an increase of the negatively substrate bias up to ? 200 V and it tend to decrease with an increase in nitrogen flow rate up to 70 sccm. The increase of hardness follows the increase of Ti and N content and rms coating roughness.

Budi, Esmar, E-mail: esmarbudi@unj.ac.id [Department of Physics, Faculty of Science and Mathematics, Universitas Negeri Jakarta, Jl. Pemuda No. 10, Jakarta 13220 (Indonesia); Razali, M. Mohd. [Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia); Nizam, A. R. Md. [Faculty of Manufacturing Engineering, UniversitiTeknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia)

2014-03-24T23:59:59.000Z

483

Cold compaction study of Armstrong Process Ti-6Al-4V powders  

SciTech Connect

This work investigates the cold compaction behavior of Ti-6Al-4V powders produced by Armstrong Process . As-received as well as milled powders were characterized and these powders were uniaxially die-pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. Samples with high aspect ratio exhibited non-uniform density along the pressing axis and the density distribution is in consistent with the result predicted by finite element analysis. The linear regression analysis on the experimental density data can be used to predict density of compacts with different aspect ratios. In the studied pressure range, an empirical powder compaction equation represents the green density pressure relationship very well for both the as-received and 1-hr milled Armstrong Ti-6Al-4V powders.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Gorti, Sarma B [ORNL; Sabau, Adrian S [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Blue, Craig A [ORNL; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2011-01-01T23:59:59.000Z

484

The early stages of solid-state reactions in Ti/Al multilayer films  

SciTech Connect

The authors have investigated the solid-state reaction of Ti/Al multilayer films by x-ray diffraction (XRD) and differential scanning calorimetry (DSC), with focus on the early stages of the reaction provided by samples with pair thicknesses in the range 5--40 nm. This reaction, which results in formation of TiAl{sub 3} with metastable L1{sub 2} structure, can be modeled by a nucleation and growth process on the basis of the Johnson-Mehl-Avrami theory, with a reaction-order parameter n {approx} 1. These observations indicate the significance of nucleation barriers even at early stages of solid-state reactions, and suggests that the phenomena of phase selection and formation of metastable phases can result from the presence of nucleation barriers.

Michaelsen, C.; Woehlert, S.; Bormann, R. [GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research; Barmak, K. [Lehigh Univ., Bethlehem, PA (United States). Dept. of Materials Science and Engineering

1996-12-31T23:59:59.000Z

485

Oxygen vacancies at the surface of SrTiO{sub 3} thin films  

SciTech Connect

The two-dimensional electron gas (2DEG) observed at the surface of oxide thin films and at the interface between two oxides has been widely discussed, but the mechanism responsible for this behavior is still not well understood. In this work, we study the properties of the SrTiO{sub 3} (001) surface and show that defects are necessary in order to explain this 2DEG. We study the properties of oxygen vacancies at the TiO{sub 2} and SrO terminated surface, and conclude they can explain the metallic behavior experimentally observed. There is a strong tendency for these vacancies to be localized at the surface, where the formation energy is less than 2.92?eV.

Silva, Alexandre R., E-mail: alexandre.silva@univasf.edu.br [Colegiado de Engenharia Mecânica, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA (Brazil); Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, SP (Brazil); Dalpian, Gustavo M., E-mail: gustavo.dalpian@ufabc.edu.br [Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, SP (Brazil)

2014-01-21T23:59:59.000Z

486

Synthesis of CdTe/TiO{sub 2} nanoparticles and their photocatalytic activity  

SciTech Connect

Graphical abstract: - Highlights: • CdTe/TiO{sub 2} photocatalysts were synthesized through a facile and convenient method. • The photosensitized degradation of RhB was largely enhanced by the composite. • Products prepared under MBSL condition exhibited higher photocatalytic activities. • The effect of MBSL had been investigated. - Abstract: Visible-light-induced CdTe/TiO{sub 2} photocatalysts were synthesized under multibubble sonoluminescence (MBSL) condition. The morphology, phase and optical properties of the products have been characterized by X-ray powder diffraction, field emission scan electron microscope, UV–vis absorption spectroscopy and photoluminescence spectroscopy. The results showed that as-prepared nanoparticles are well-crystallized with a better size distribution. In addition, the photocatalytic activities of products were evaluated using the photocatalytic degradation of rhodamine B as a probe reaction. The results showed that the products synthesized under MBSL condition exhibited higher photocatalytic activities than those without MBSL irradiation.

Li, Deliang, E-mail: lideliang@henu.edu.cn; Wang, Shijun; Wang, Jing; Zhang, Xiaodan; Liu, Shanhu

2013-10-15T23:59:59.000Z

487

Hall Effect, Resistivity, and Magnetoresistivity of Th, U, Zr, Ti, and Nb  

Science Journals Connector (OSTI)

The Hall effect, resistivity, and magnetoresistivity of Th, U, Zr, Ti, and Nb have been studied at temperatures between ?1°K and room temperature and in magnetic fields up to 30 kilogauss. Strong temperature and purity dependences were observed in the Hall coefficients of U, Ti, and Zr. In addition, the Hall coefficient of Zr was strongly dependent upon magnetic field strength at liquid helium temperatures. Comparisons with theory have been carried out, and it is concluded that existing theories are not sufficiently general to account quantitatively for the observed temperature and magnetic field dependences of the Hall effect and resistivity. Unusual behavior was observed in the magnetic-field-induced superconducting transition of Nb.

Ted G. Berlincourt

1959-05-15T23:59:59.000Z

488

Mass loss of copper alloy electrode during TiB2 coating by electrospark deposition  

Science Journals Connector (OSTI)

Titanium diboride was deposited on the surface of spot-welding electrodes for zinc coated steel sheets due to its high electrical and thermal conductivity and potential to prolong the lifespan of the electrodes, and mass of the electrodes was measured after every 30 s during depositing. The results showed that the as-deposited electrodes are losing their mass during the process, which is completely different from the deposition of TiC. Evaporation of copper and oxidation of TiB2 at high temperature generated by electrosparking play the most important roles in the mass loss. Cutting and flaking of the brittle coating also contribute to the mass loss. The cracks within the coating are channels for the leakage of the evaporated substrate material. The mass of the electrodes decreases as the pulse energy increases with the voltage increasing. Pre-coated nickel contributes to the mass loss of the electrodes too.

Cheng Luo; Shijie Dong; Xiang Xiong; Norman Zhou

2009-01-01T23:59:59.000Z

489

Kinetics of oxygen interstitial injection and lattice exchange in rutile TiO{sub 2}  

SciTech Connect

The existence of a facile surface pathway for generation of O interstitials (O{sub i}) in rutile that can facilitate annihilation of O undesirable vacancies has been demonstrated recently. Through isotopic self-diffusion experiments, the present work determines a value of approximately 1.8?eV for the activation energy of O{sub i} injection from TiO{sub 2} (110). The mean path length for O{sub i} diffusion decreases by nearly an order of magnitude upon adsorption of 0.1 monolayer of sulfur. Sulfur apparently inhibits the surface annihilation rate of Ti interstitials, lowering their bulk concentration and the corresponding catalytic effect they seem to exert upon O{sub i} exchange with the lattice.

Gorai, Prashun; Hollister, Alice G.; Pangan-Okimoto, Kristine; Seebauer, Edmund G., E-mail: eseebaue@illinois.edu [Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801 (United States)

2014-05-12T23:59:59.000Z

490

Electronic structure and magnetic susceptibility of the different structural modifications of Ti, Zr, and Hf metals  

Science Journals Connector (OSTI)

The electronic structure of the early transition metals Ti, Zr, and Hf has been investigated for the hexagonal (?), hcp (?), bcc (?), and fcc phases using the linear-muffin-tin-orbital method of band-structure calculation. The results of these investigations are discussed in the light of previous band-structure calculations and experimental data closely related to the electronic structure (low-temperature specific heat, superconductive properties and magnetic susceptibility). It is found from the theoretical calculations that the electronic density of states at the Fermi level increases in the phase sequence hexagonal (?)?hcp (?)?fcc?bcc (?) and this behavior is unambiguously reflected in all the experimental data as well. A separation of the magnetic susceptibility into its components is performed and from this, the temperature dependence of the Pauli susceptibility for Ti, Zr, and Hf is deduced.

I. Bakonyi, H. Ebert, and A. I. Liechtenstein

1993-09-15T23:59:59.000Z

491

High-temperature thermoelectric response of double-doped SrTiO3 epitaxial films  

Science Journals Connector (OSTI)

SrTiO3 is a promising n-type oxide semiconductor for thermoelectric energy conversion. Epitaxial thin films of SrTiO3 doped with both La and oxygen vacancies have been synthesized by pulsed laser deposition. The thermoelectric and galvanomagnetic properties of these films have been characterized at temperatures ranging from 300 to 900 K and are typical of a doped semiconductor. Thermopower values of double-doped films are comparable to previous studies of La-doped single crystals at similar carrier concentrations. The highest thermoelectric figure of merit (ZT) was measured to be 0.28 at 873 K at a carrier concentration of 2.5×1021?cm?3.

J. Ravichandran; W. Siemons; D.-W. Oh; J. T. Kardel; A. Chari; H. Heijmerikx; M. L. Scullin; A. Majumdar; R. Ramesh; D. G. Cahill

2010-10-28T23:59:59.000Z

492

Photocarrier dynamics in anatase TiO{sub 2} investigated by pump-probe absorption spectroscopy  

SciTech Connect

The dynamics of photogenerated electrons and holes in undoped anatase TiO{sub 2} were studied by femtosecond absorption spectroscopy from the visible to mid-infrared region (0.1–2.0?eV). The transient absorption spectra exhibited clear metallic responses, which were well reproduced by a simple Drude model. No mid-gap absorptions originating from photocarrier localization were observed. The reduced optical mass of the photocarriers obtained from the Drude-model analysis is comparable to theoretically expected one. These results demonstrate that both photogenerated holes and electrons act as mobile carriers in anatase TiO{sub 2}. We also discuss scattering and recombination dynamics of photogenerated electrons and holes on the basis of the time dependence of absorption changes.

Matsuzaki, H., E-mail: hiroyuki-matsuzaki@aist.go.jp, E-mail: okamotoh@k.u-tokyo.ac.jp; Matsui, Y.; Uchida, R.; Yada, H.; Terashige, T. [Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561 (Japan); Li, B.-S. [Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561 (Japan); Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology (HIT), Harbin City 150080 (China); Sawa, A. [National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562 (Japan); Kawasaki, M. [Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Bunkyo-ku, Tokyo 113-8656 (Japan); Tokura, Y. [National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562 (Japan); Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Bunkyo-ku, Tokyo 113-8656 (Japan); Okamoto, H., E-mail: hiroyuki-matsuzaki@aist.go.jp, E-mail: okamotoh@k.u-tokyo.ac.jp [Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561 (Japan); CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075 (Japan)

2014-02-07T23:59:59.000Z

493

Voltage-dependent resistance of undoped rutile, TiO{sub 2}, ceramics  

SciTech Connect

Lightly reduced rutile ceramics are n-type semiconductors whose resistance increases reversibly by 1–2 orders of magnitude, depending on temperature, on application of a small dc bias of 10–100?V cm{sup ?1}. A similar effect is seen on changing the oxygen partial pressure surrounding the sample during impedance measurements and the bias dependence is attributed to changes in the equilibria between various ionised oxygen species adsorbed on sample surfaces, leading to changes in the mobile electron concentration in the sample bulk. The increase in resistance of n-type TiO{sub 2} with dc bias mirrors the decrease in resistance seen with p-type semiconductors such as acceptor-doped BaTiO{sub 3} and represents an effect, which has certain memristive characteristics but also significant differences.

Liu, Yang; West, Anthony R. [Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield, South Yorkshire S1 3JD (United Kingdom)] [Department of Materials Science and Engineering, University of Sheffield, Mappin St., Sheffield, South Yorkshire S1 3JD (United Kingdom)

2013-12-23T23:59:59.000Z

494

Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) using Na-Y and AgNa-Y zeolites for fuel cell applications  

Science Journals Connector (OSTI)

Adsorptive removal of tetrahydrothiophene (THT) and tert-butylmercaptan (TBM) that are widely used sulfur odorants in pipeline natural gas was studied using AgNa-Y zeolites at ambient temperature and atmospheric pressure. The AgNa-Y were obtained via Ag+-exchange with Na+ of Na-Y at various exchange levels, and the contributions of formed adsorption sites (Ag+, Na+, Ag0, H+, and Ag2O) in the THT and TBM adsorption uptake and selectivity were characterized. THT adsorption strength on these sites followed an order of Ag+ > Na+ ? Ag0 > H+ > Ag2O. The adsorption strength of THT on Na+ sites was sufficiently high, thus an increase in the Ag+-exchange level did not lead to a notable increase in the breakthrough THT uptake. Differently, adsorption of TBM on Na+ sites was weak, whereas that on Ag+ sites was strong. This resulted in a marked increase in the breakthrough TBM uptake with an increase in the Ag+-exchange level, showing an order of magnitude higher uptake on AgNa-Y compared with that on Na-Y. Noticeably, the adsorption strength of THT on these adsorption sites was higher than that of TBM. This resulted in an almost 100% adsorption selectivity for THT over TBM, when these two sulfur species coexisted in the feed stream.

Doohwan Lee; Eun-Yong Ko; Hyun Chul Lee; Soonho Kim; Eun Duck Park

2008-01-01T23:59:59.000Z

495

Single crystal growth and characterization of ilmenite, FeTiO?, for electronic applications  

E-Print Network (OSTI)

SINGLE CRYSTAL GROWTH AND CHARACTERIZATION OF ILMENITE, FeTi03, FOR ELECTRONIC APPUCATIONS A Thesis by BRIAN LEONARD GRIES Submitted to the Office of Graduate Studies Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE December 1988 Major Subject: Electrical Engineering SINGLE CRYSTAL GROWTH AND CHARACTERIZATION OF ILMENITE, FeT)Oq, FOR ELECTRONIC APPLICATIONS A Thesis by BRIAN LEONARD GRIES Approved as to style and content by...

Gries, Brian Leonard

2012-06-07T23:59:59.000Z

496

Nanoscale retention-loss dynamics of polycrystalline PbTiO{sub 3} nanotubes.  

SciTech Connect

We observed the nanoscale retention dynamics of polycrystalline PbTiO{sub 3} nanotubes using piezoresponse force microscopy. We found that the retention loss of the nanodot domains on the nanotubes showed the stretched exponential relaxation behaviors with stretched exponential factor n being less than 1 (0.523 and 0.692), which are similar to the thin films. In addition, the nanodot domains showed a diverse relaxation time constant {tau} due to different remnant polarization of each dot domains.

Choi, H.; Kim, Y.; Hong, S.; Sung, T.-H.; Shin, H.; No, K. (Materials Science Division); (Korea Advanced Inst. of Science and Technology); (Hanyang Univ.); (Kookmin Univ.)

2011-07-01T23:59:59.000Z

497

Shell Model for Atomistic Simulation of Lithium Diffusion in Mixed Mn/Ti Oxides  

SciTech Connect

Mixed Mn/Ti oxides present attractive physicochemical properties such as their ability to accommodate Li for application in Li-ion batteries. In this work, atomic parameters for Mn were developed to extend an existing shell model of the Li-Ti-O system and allow simulations of pure and lithiated Mn and mixed Mn/Ti oxide polymorphs. The shell model yielded good agreement with experimentally-derived structures (i.e. lattice parameters and inter-atomic distances) and represented an improvement over existing potential models. The shell model was employed in molecular dynamics (MD) simulations of Li diffusion in the 1×1 c direction channels of LixMn1 yTiyO2 with the rutile structure, where 0 ? x ? 0.25 and 0 ? y ? 1. In the infinite dilution limit, the arrangement of Mn and Ti ions in the lattice was found to have a significant effect on the activation energy for Li diffusion in the c channels due to the destabilization of half of the interstitial octahedral sites. Anomalous diffusion was demonstrated for Li concentrations as low as x = 0.125, with a single Li ion positioned in every other c channel. Further increase in Li concentration showed not only the substantial effect of Li-Li repulsive interactions on Li mobility but also their influence on the time dependence of Li diffusion. The results of the MD simulations can inform intrinsic structure-property relationships for the rational design of improved electrode materials for Li-ion batteries.

Kerisit, Sebastien N.; Chaka, Anne M.; Droubay, Timothy C.; Ilton, Eugene S.

2014-10-23T23:59:59.000Z

498

Surface roughening, columnar growth and intrinsic stress formation in amorphous CuTi films  

SciTech Connect

The growth of amorphous CuTi films, prepared by electron beam evaporation, is investigated by Scanning Tunneling Microscopy (STM), Small Angle Neutron Scattering (SANS) and in situ measurements of intrinsic mechanical stresses (ISM). In early growth stages the films develop compressive stresses and, with increasing film thickness, a crossover to tensile stresses. In the same thickness range the STM investigations show a change in the growth mode. The experiments suggest a transition from planar growth with statistical surface roughening to columnar growth.

Huelsen, U.V.; Geyer, U. [Physikalisches Inst., Goettingen (Germany); Thiyagarajan, P. [Argonne National Lab., IL (United States)

1997-11-01T23:59:59.000Z

499

Microstructure and stability of TiB sub 2 and Cu multilayers  

SciTech Connect

The interfacial stability of a high strength TiB{sub 2}/Cu multilayer structure was examined by subjecting the layers to ion irradiation by 400 keV Ne{sup ++} ions up to a maximum dose of 12 {times} 10 {sup 15} ions/cm{sup 2}. Even at the highest dose, with maximum dpa value of 4.92, the explained by examining the maximum thermodynamic driving force for interfacial reactions in this system. 7 refs., 3 figs.

Basu, S.N.; Hubbard, K.M.; Hirvonen, J.-P.; Mitchell, T.E.; Nastasi, M.

1990-01-01T23:59:59.000Z

500

Numerical Simulation of Cold Pressing of Armstrong CP-Ti Powders  

SciTech Connect

Numerical simulation results for the cold pressing of Armstrong CP-Ti Powders are presented. The computational model was implemented in the commercial finite element program ABAQUSTM. Several simulation cases were conducted for cylindrical samples with different friction coefficients and different compaction pressures, under both single-action and dual-action uniaxial pressing. Numerical simulation results for the density distribution are compared against experimental data in order to validate the computational model.

Sabau, Adrian S [ORNL] [ORNL; Gorti, Sarma B [ORNL] [ORNL; Peter, William H [ORNL] [ORNL; Chen, Wei [ORNL] [ORNL; Yamamoto, Yukinori [ORNL] [ORNL