Sample records for bh fe ru

  1. Thermodynamics and superconductivity of Th7(Fe, Ru, Os, Co, Rh, Ir)3 system

    SciTech Connect (OSTI)

    Smith, James L [Los Alamos National Laboratory; Lashley, Jason C [Los Alamos National Laboratory; Volz, Heather M [Los Alamos National Laboratory; Fisher, Robert A [Los Alamos National Laboratory

    2008-01-01T23:59:59.000Z

    Expanding the temperature range of previous specific-heat measurements on the Th7(Fe, Ru, Os, Co, Rh, Ir)3 system, we measure the effect of transition-metal substitution on total entropy (S{sub 298 k}), electronic specific heat ({gamma}), and Debye temperature ({Theta}D). In addition we measure the pressure dependence, up to 10 kbar, of the superconducting transition.

  2. Electronic structure of Fe-vs. Ru-based dye molecules Phillip S. Johnson, Peter L. Cook, Ioannis Zegkinoglou, J. M. Garca-Lastra, Angel Rubio et al.

    E-Print Network [OSTI]

    Himpsel, Franz J.

    Electronic structure of Fe- vs. Ru-based dye molecules Phillip S. Johnson, Peter L. Cook, Ioannis molecules Phillip S. Johnson,1 Peter L. Cook,2 Ioannis Zegkinoglou,1,3 J. M. García-Lastra,4,5 Angel Rubio,4 molecules for solar cells, the differences in the electronic structure of Fe- and Ru-based dyes

  3. Ordered vs. disordered perovskites; structural studies of Fe-doped SrIrO{sub 3} and SrRuO{sub 3}

    SciTech Connect (OSTI)

    Qasim, Ilyas; Blanchard, Peter E.R.; Liu, Samuel; Tang, Chunguang [School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia); Kennedy, Brendan J., E-mail: B.Kennedy@chem.usyd.edu.au [School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia); Avdeev, Maxim [Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234 (Australia); Kimpton, Justin A. [Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168 (Australia)

    2013-10-15T23:59:59.000Z

    The structures of the two Fe containing perovskites Sr{sub 2}IrFeO{sub 6} and SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} have been established using a combination of synchrotron and neutron diffraction methods. Sr{sub 2}IrFeO{sub 6} and SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} are shown to be monoclinic I2/m and tetragonal I4/mcm respectively The former exhibits a rock-salt like ordering of the Fe and Ir cations and displays a sequence of phase transitions associated with the loss of the octahedral tilts upon heating; 12/m?I4/m?Fm3{sup ¯}m. The Fe and Ru cations are disordered in SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} and this shows a single structural phase transition upon heating due to the loss of the in-phase tilts, viz. I4/mcm?Pm3{sup ¯}m. In both cases XANES measurements show partial oxidation of the Fe{sup 3+} to Fe{sup 4+}. The difference in the structures between the two is remarkable given the similar size of Ir{sup 5+} and Ru{sup 5+}, and this is reflected in their magnetic properties. - Graphical abstract: Sr{sub 2}IrFeO{sub 6} and SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} are shown, using a combination of synchrotron and neutron diffraction, to be monoclinic I2/m with cation ordering and tetragonal I4/mcm with disordered Fe and Ir, respectively. Both undergo phase transitions upon heating due to the loss of the octahedral tilts. Display Omitted - Highlights: • Sr{sub 2}IrFeO{sub 6} shown to be monoclinic and shows the transitions upon heating I2/m?I4/m? Fm3{sup ¯}m. • SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} is tetragonal and shows a single I4/mcm?Pm3m transition upon heating. • The Fe and Ru cations are disordered in SrRu{sub 0.5}Fe{sub 0.5}O{sub 3} but ordered in Sr{sub 2}FeIrO{sub 6}. • XANES measurements show partial oxidation of the Fe{sup 3+} to Fe{sup 4+}.

  4. Chemical pressure tuning of URu?Si? via isoelectronic substitution of Ru with Fe

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

    Das, Pinaki; Kanchanavatee, N.; Helton, J. S.; Huang, K.; Baumbach, R. E.; Bauer, E. D.; White, B. D.; Burnett, V. W.; Maple, M. B.; Lynn, J. W.; et al

    2015-02-01T23:59:59.000Z

    We have used specific heat and neutron diffraction measurements on single crystals of URu2–xFexSi? for Fe concentrations x ? 0.7 to establish that chemical substitution of Ru with Fe acts as “chemical pressure” Pch as previously proposed by Kanchanavatee et al. [Phys. Rev. B 84, 245122 (2011)] based on bulk measurements on polycrystalline samples. Notably, neutron diffraction reveals a sharp increase of the uranium magnetic moment at x = 0.1, reminiscent of the behavior at the “hidden order” to large moment antiferromagnetic (LMAFM) phase transition observed at a pressure Px ? 0.5-0.7 GPa in URu?Si?. Using the unit cell volumemore »determined from our measurements and an isothermal compressibility ?T = 5.2×10?³ GPa?¹ for URu?Si?, we determine the chemical pressure Pch in URu2?xFexSi? as a function of x. The resulting temperature T-chemical pressure Pch phase diagram for URu2?xFexSi? is in agreement with the established temperature T-external pressure P phase diagram of URu?Si?.« less

  5. Tailoring the composition of ultrathin, ternary alloy PtRuFe nanowires for the methanol oxidation reaction and formic acid oxidation reaction

    SciTech Connect (OSTI)

    Scofield, Megan E. [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Koenigsmann, Christopher [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Wang, Lei [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Lui, Haiqing [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Wong, Stanislaus S. [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

    2015-01-01T23:59:59.000Z

    In the search for alternatives to conventional Pt electrocatalysts, we have synthesized ultrathin, ternary PtRuFe nanowires (NW), possessing different chemical compositions in order to probe their CO tolerance as well as electrochemical activity as a function of composition for both (i) the methanol oxidation reaction (MOR) and (ii) the formic acid oxidation reaction (FAOR). As-prepared ‘multifunctional’ ternary NW catalysts exhibited both higher MOR and FAOR activity as compared with binary Pt?Ru? NW, monometallic Pt NW, and commercial catalyst control samples. In terms of synthetic novelty, we utilized a sustainably mild, ambient wet-synthesis method never previously applied to the fabrication of crystalline, pure ternary systems in order to fabricate ultrathin, homogeneous alloy PtRuFe NWs with a range of controlled compositions. These NWs were subsequently characterized using a suite of techniques including XRD, TEM, SAED, and EDAX in order to verify not only the incorporation of Ru and Fe into the Pt lattice but also their chemical homogeneity, morphology, as well as physical structure and integrity. Lastly, these NWs were electrochemically tested in order to deduce the appropriateness of conventional explanations such as (i) the bi-functional mechanism as well as (ii) the ligand effect to account for our MOR and FAOR reaction data. Specifically, methanol oxidation appears to be predominantly influenced by the Ru content, whereas formic acid oxidation is primarily impacted by the corresponding Fe content within the ternary metal alloy catalyst itself.

  6. Tailoring the composition of ultrathin, ternary alloy PtRuFe nanowires for the methanol oxidation reaction and formic acid oxidation reaction

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

    Scofield, Megan E.; Koenigsmann, Christopher; Wang, Lei; Lui, Haiqing; Wong, Stanislaus S.

    2015-01-01T23:59:59.000Z

    In the search for alternatives to conventional Pt electrocatalysts, we have synthesized ultrathin, ternary PtRuFe nanowires (NW), possessing different chemical compositions in order to probe their CO tolerance as well as electrochemical activity as a function of composition for both (i) the methanol oxidation reaction (MOR) and (ii) the formic acid oxidation reaction (FAOR). As-prepared ‘multifunctional’ ternary NW catalysts exhibited both higher MOR and FAOR activity as compared with binary Pt?Ru? NW, monometallic Pt NW, and commercial catalyst control samples. In terms of synthetic novelty, we utilized a sustainably mild, ambient wet-synthesis method never previously applied to the fabrication ofmore »crystalline, pure ternary systems in order to fabricate ultrathin, homogeneous alloy PtRuFe NWs with a range of controlled compositions. These NWs were subsequently characterized using a suite of techniques including XRD, TEM, SAED, and EDAX in order to verify not only the incorporation of Ru and Fe into the Pt lattice but also their chemical homogeneity, morphology, as well as physical structure and integrity. Lastly, these NWs were electrochemically tested in order to deduce the appropriateness of conventional explanations such as (i) the bi-functional mechanism as well as (ii) the ligand effect to account for our MOR and FAOR reaction data. Specifically, methanol oxidation appears to be predominantly influenced by the Ru content, whereas formic acid oxidation is primarily impacted by the corresponding Fe content within the ternary metal alloy catalyst itself.« less

  7. Structure and magnetic properties of L1{sub 0}-FePt thin films on TiN/RuAl underlayers

    SciTech Connect (OSTI)

    Yang En; Ratanaphan, Sutatch [Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); Zhu Jiangang [Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); ABB Professor of Engineering Department of Electrical and Computer Engineering, Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); Laughlin, David E. [Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); ALCOA Professor of Physical Metallurgy Materials Science and Engineering Department, Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

    2011-04-01T23:59:59.000Z

    Highly ordered L1{sub 0} FePt-oxide thin films with small grains were prepared by using a RuAl layer as a grain size defining seed layer along with a TiN barrier layer. Different HAMR (Heat Assisted Magnetic Recording) favorable underlayers were studied to encourage perpendicular texture and preferred microstructure. It was found that the epitaxial and small grain growth from the RuAl/TiN underlayer results in small and uniform grains in the FePt layer with perpendicular texture. By introducing the grain size defining underlayers, the FePt grain size can be reduced from 30 to 6 nm with the same volume fraction (9%) of SiO{sub 2} in the film, excellent perpendicular texture, and very high order parameter at 520 deg. C.

  8. Noncollinear ferromagnetic easy axes in Py/Ru/FeCo/IrMn spin valves induced by oblique deposition

    SciTech Connect (OSTI)

    Bueno, T. E. P.; Parreiras, D. E.; Gomes, G. F. M.; Krambrock, K.; Paniago, R. [Departamento de Física, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG (Brazil); Michea, S.; Rodríguez-Suárez, R. L. [Centro de Investigación en Nanotecnología y Materiales Avanzados “CIEN-UC,” Pontifícia Universidad Católica de Chile, Casilla 306, Santiago (Chile); Filho, M. S. Araújo; Macedo, W. A. A. [Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear, 30123-970 Belo Horizonte, MG (Brazil)

    2014-06-16T23:59:59.000Z

    We present an investigation on the magnetic properties of Py/Ru/FeCo/IrMn spin valves grown by dc magnetron sputtering. The sample fabrication setup has two important features, (i) the five magnetron sputtering sources are placed in a cluster flange 72° from each other, and (ii) each source is tilted with respect to the sample normal. In-plane angular dependence of the ferromagnetic resonance (FMR) was used to obtain the relevant magnetic anisotropies, such as uniaxial and exchange bias fields. The oblique deposition geometry employed has induced non-collinear easy axes of the two ferromagnetic (FM) layers, with high uniaxial field strengths. The symmetry shift of the angular dependence of the FMR resonances of the two FM layers gives us directly the angle between the easy axes of FM{sub 1} (Py) and FM{sub 2} (FeCo), which turned out to be the angle between two adjacent sputtering sources. The observations of the present study suggest that, by combining oblique deposition and appropriate angles of incidence of the deposition flux, the uniaxial (and unidirectional) axes of individual FM layers can be precisely engineered in spin valve fabrication.

  9. Kinetic deuterium isotope effects in the protonations of ((/mu/-H)M/sub 3/(CO)/sub 11/)/sup /minus// (M = Fe, Ru, Os)

    SciTech Connect (OSTI)

    Pribich, D.G.; Rosenberg, E.

    1988-08-01T23:59:59.000Z

    The rates of low-temperature (/minus/90 to /minus/40/degree/C) protonation of the anions ((/mu/-H)M/sub 3/(CO)/sub 11/)/sup /minus// (M = Fe, Ru, Os) have been investigated with XSO/sub 3/F (X = H or D) in CD/sub 2/Cl/sub 2/ by using /sup 1/H and /sup 13/C NMR techniques. No deuterium kinetic isotope effect is observed on the rate of protonation to give the initially formed oxygen-protonated species (/mu/-H)(COX)M/sub 3/(CO)/sub 10/ (M = Fe, Ru; X = H or D). However, in the case of ruthenium the rate of transformation of this species to the dihydrido species (/mu/-X)XRu/sub 3/(CO)/sub 11/ (X = H or D) shows a very large isotope effect (k/sub H//k/sub D/ = 47 at /minus/40/degree/C). In the case of osmium, the previously unobserved oxygen-deuteriated species (/mu/-H)(COD)Os/sub 3/(CO)/sub 10/ is seen at /minus/80/degree/C with DSO/sub 3/F. Under these conditions, protonation with HSO/sub 3/F yields only (/mu/-H)(H)Os/sub 3/(CO)/sub 11/. These large isotope effects on ligand to metal hydrogen transfer are discussed in connection with previously observed large isotope effects in cluster protonations.

  10. Electronic, structural and magnetic studies of niobium borides of group 8 transition metals, Nb{sub 2}MB{sub 2} (M=Fe, Ru, Os) from first principles calculations

    SciTech Connect (OSTI)

    Touzani, Rachid St.; Fokwa, Boniface P.T., E-mail: Boniface.Fokwa@ac.rwth-aachen.de

    2014-03-15T23:59:59.000Z

    The Nb{sub 2}FeB{sub 2} phase (U{sub 3}Si{sub 2}-type, space group P4/mbm, no. 127) is known for almost 50 years, but until now its magnetic properties have not been investigated. While the synthesis of Nb{sub 2}OsB{sub 2} (space group P4/mnc, no. 128, a twofold superstructure of U{sub 3}Si{sub 2}-type) with distorted Nb-layers and Os{sub 2}-dumbbells was recently achieved, “Nb{sub 2}RuB{sub 2}” is still not synthesized and its crystal structure is yet to be revealed. Our first principles density functional theory (DFT) calculations have confirmed not only the experimental structures of Nb{sub 2}FeB{sub 2} and Nb{sub 2}OsB{sub 2}, but also predict “Nb{sub 2}RuB{sub 2}” to crystalize with the Nb{sub 2}OsB{sub 2} structure type. According to chemical bonding analysis, the homoatomic B–B interactions are optimized and very strong, but relatively strong heteroatomic M–B, B–Nb and M–Nb bonds (M=Fe, Ru, Os) are also found. These interactions, which together build a three-dimensional network, are mainly responsible for the structural stability of these ternary borides. The density-of-states at the Fermi level predicts metallic behavior, as expected, from metal-rich borides. Analysis of possible magnetic structures concluded preferred antiferromagnetic ordering for Nb{sub 2}FeB{sub 2}, originating from ferromagnetic interactions within iron chains and antiferromagnetic exchange interactions between them. -- Graphical abstract: Nb{sub 2}FeB{sub 2} (U{sub 3}Si{sub 2} structure type, space group P4/mbm, no. 127) is predicted to order antiferromagnetically, due to the presence of iron chains which show ferromagnetic interactions in the chains and antiferromagnetic interactions between them. “Nb{sub 2}RuB{sub 2}” is predicted to crystallize with the recently discovered Nb{sub 2}OsB{sub 2} twofold superstructure (space group P4/mnc, no. 128) of U{sub 3}Si{sub 2} structure type. The building of ruthenium dumbbells instead of chains along [001] is found to be responsible for the stabilization of this superstructure. Highlights: • Nb{sub 2}FeB{sub 2} is predicted to order antiferromagnetically. • Ferromagnetic interactions found in iron chains and antiferromagnetic ones between them. • Unknown “Nb{sub 2}RuB{sub 2}” predicted to crystallize with a twofold U{sub 3}Si{sub 2} superstructure. • Puckering of Nb-layer and Ru-dumbbell formation responsible for superstructure occurrence.

  11. Percolation theory and quantum critical systems: A new description of the critical behavior in Ce(Ru{sub 0.24}Fe{sub 0.76}){sub 2}Ge{sub 2}

    SciTech Connect (OSTI)

    Gaddy, John [Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States); Heitmann, Tom, E-mail: HeitmannT@missouri.edu [Missouri Research Reactor, University of Missouri, Columbia, Missouri 65211 (United States); Montfrooij, Wouter [Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States); Missouri Research Reactor, University of Missouri, Columbia, Missouri 65211 (United States)

    2014-05-07T23:59:59.000Z

    The onset of ordering in quantum critical systems is characterized by a competition between the Kondo shielding of magnetic moments and the ordering of these moments. We show how a distribution of Kondo shielding temperatures—resulting from chemical doping—leads to critical behavior whose main characteristics are given by percolation physics. With the aid of Monte Carlo computer simulations, we are able to infer the low temperature part of the distribution of shielding temperatures in heavily doped quantum critical Ce(Ru{sub 0.24}Fe{sub 0.76}){sub 2}Ge{sub 2}. Based on this distribution, we show that the ordering dynamics—such as the growth of the correlation length upon cooling—can be understood by the spawning of magnetic clusters. Our findings explain why the search for universal exponents in quantum critical systems has been unsuccessful: the underlying percolation network associated with the chemical doping of quantum critical systems has to be incorporated in the modeling of these quantum critical systems.

  12. Microsoft Word - InterfacialElectron bh

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

    Band structure of 1 UC FeSe film on STO. a, The Fermi surface, consisting of only pockets near the M-point. b-c, The measured dispersion along the high symmetry cut near the zone...

  13. Bulk modulus and specific heat of B-site doped (La{sub 0.3}Pr{sub 0.7}){sub 0.65}Ca{sub 0.35}Mn{sub 1?x}B{sub x}O{sub 3} (B=Fe, Cr, Ru, Al, Ga)

    SciTech Connect (OSTI)

    Srivastava, Archana, E-mail: archanasaran01@gmail.com [Department of Physics, Sri Sathya Sai College for Women, Bhopal-462024 (India); Thakur, Rasna; Gaur, N. K. [Department of Physics, Barkatullah University, Bhopal-462026 (India)

    2014-04-24T23:59:59.000Z

    Specific heat (C{sub p}) thermal expansion (?) and Bulk modulus (B{sub T}) of lightly doped Rare Earth manganites (La{sub 0.3}Pr{sub 0.7}){sub 0.65}Ca{sub 0.35}Mn{sub 1?x}B{sub x}O{sub 3} (B{sup 3+}?=?Fe{sup 3+},Cr{sup 3+},Ga{sup 3+},Al{sup 3+},Ru4+); (0.3Fe{sub 0.03}O{sub 3} as a function of temperature (10K?T? 200K) is found to be in agreement with the published data. The trend of variation of Debye temperature with B-site cationic radius is predicted probably for the first time for the B-site doped rare earth manganites.

  14. Quasielastic neutron scattering of -NH3 and -BH3 rotational dynamics...

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

    Quasielastic neutron scattering of -NH3 and -BH3 rotational dynamics in orthorhombic ammonia borane. Quasielastic neutron scattering of -NH3 and -BH3 rotational dynamics in...

  15. Approved Module Information for BH3328, 2014/5 Module Title/Name: Psychology and Work Module Code: BH3328

    E-Print Network [OSTI]

    Neirotti, Juan Pablo

    Approved Module Information for BH3328, 2014/5 Module Title/Name: Psychology and Work Module Code Module Management Information Module Leader Name Alison Legood Email Address a.legood2@aston.ac.uk Telephone Number 0121 204 3270 Office SW8018 Additional Module Tutor(s): Dhensa-Kahlon. Level Description

  16. Approved Module Information for BH2239, 2014/5 Module Title/Name: Psychology and Work Module Code: BH2239

    E-Print Network [OSTI]

    Neirotti, Juan Pablo

    Approved Module Information for BH2239, 2014/5 Module Title/Name: Psychology and Work Module Code Module Management Information Module Leader Name Alison Legood Email Address a.legood2@aston.ac.uk Telephone Number 0121 204 3270 Office SW8018 Additional Module Tutor(s): Dhensa-Kahlon. Level Description

  17. In-silico and in-vitro elucidation of BH3 binding specificity towards Bcl-2

    E-Print Network [OSTI]

    London, Nir

    Interactions between Bcl-2-like proteins and BH3 domains play a key role in the regulation of apoptosis. Despite the overall structural similarity of their interaction with helical BH3 domains, Bcl-2-like proteins exhibit ...

  18. Atomistic modeling of Ru nanocluster formation on graphene/Ru(0001): Thermodynamically versus kinetically directed-assembly

    E-Print Network [OSTI]

    Ulm, Universität

    Atomistic modeling of Ru nanocluster formation on graphene/Ru(0001): Thermodynamically versus nanocluster formation on a monolayer of graphene supported on Ru(0001) at 309 K. Nanocluster density, mean

  19. Ionic conductivity and the formation of cubic CaH{sub 2} in the LiBH{sub 4}–Ca(BH{sub 4}){sub 2} composite

    SciTech Connect (OSTI)

    Sveinbjörnsson, Dadi; Blanchard, Didier [Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde (Denmark); Myrdal, Jon Steinar Gardarsson [Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde (Denmark); Center for Atomic-Scale Materials Design, Department of Physics, Technical University of Denmark, Anker Engelunds Vej 1, DK-2800 Lyngby (Denmark); Younesi, Reza; Viskinde, Rasmus [Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde (Denmark); Riktor, Marit Dalseth [Physics Department, Institute for Energy Technology, Instituttveien 18, P.O. Box 40, NO-2027 Kjeller (Norway); Norby, Poul [Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde (Denmark); Vegge, Tejs, E-mail: teve@dtu.dk [Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, DK-4000 Roskilde (Denmark)

    2014-03-15T23:59:59.000Z

    LiBH{sub 4}–Ca(BH{sub 4}){sub 2} composites were prepared by ball milling. Their crystal structures and phase composition were investigated using synchrotron X-ray diffraction and Rietveld refinement, and their ionic conductivity was measured using impedance spectroscopy. The materials were found to form a physical mixture. The composites were composed of ?-Ca(BH{sub 4}){sub 2}, ?-Ca(BH{sub 4}){sub 2} and orthorhombic LiBH{sub 4}, and the relative phase quantities of the Ca(BH{sub 4}){sub 2} polymorphs varied significantly with LiBH{sub 4} content. The formation of small amounts of orthorhombic CaH{sub 2} and cubic CaH{sub 2} in a CaF{sub 2}-like structure was observed upon heat treatment. Concurrent formation of elemental boron may also occur. The ionic conductivity of the composites was measured using impedance spectroscopy, and was found to be lower than that of ball milled LiBH{sub 4}. Electronic band structure calculations indicate that cubic CaH{sub 2} with hydrogen defects is electronically conducting. Its formation along with the possible precipitation of boron therefore has an effect on the measured conductivity of the LiBH{sub 4}–Ca(BH{sub 4}){sub 2} composites and may increase the risk of an internal short-circuit in the cells. -- Graphical abstract: An Arrhenius plot of the ionic conductivity of the LiBH{sub 4}–Ca(BH{sub 4}){sub 2} composites (red, blue, green). The ionic conductivity of ball milled (gray) and non-milled (black) LiBH{sub 4} is shown for comparison. The filled symbols are measured during heating runs and the empty symbols are measured during subsequent cooling runs. The conductivity of the composites is in all cases higher during cooling, most probably due to the formation of an electronically conducting layer containing defect-rich cubic CaH{sub 2}. Such layer formation could eventually lead to a short circuit in the cell and reveals a general issue of chemical stability that should be attended to in the development of solid electrolyte materials. Highlights: • The LiBH{sub 4}–Ca(BH{sub 4}){sub 2} composite forms a physical mixture rather than a solid solution. • The formation of defect-rich, cubic CaH{sub 2} in a CaF{sub 2}-like structure is observed. • A new layer containing cubic CaH{sub 2} is conducting and may lead to a short-circuit.

  20. Kinetic Characterization of PtRu Fuel Cell Anode Catalysts Made by Spontaneous Pt Deposition on Ru Nanoparticles

    E-Print Network [OSTI]

    Brankovic, Stanko R.

    rotating disk electrode without using Nafion film to stabilize them. Nonlinear fittings of the entire for a polycrystalline Pt electrode. For the PtRu20 , PtRu10 , and PtRu5 samples prepared by spontaneous deposition of 1 spontaneous deposition of Pt4 and Pd5 on Ru-single crystals, which facilitates a new method

  1. Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene/Ru(0001) Heterostructures

    E-Print Network [OSTI]

    Ciobanu, Cristian

    Graphene on Ru(0001) Moire Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene on graphene/Ru(0001) were used to study the corrugation of the moire structure of graphene/Ru(0001 for the graphene/Ru(0001) moire is of structural nature rather than electronic. STM showed a large value

  2. Surface core-level shifts at an oxygen-rich Ru surface: O/Ru(0 0 0 1) vs. RuO2(1 1 0)

    E-Print Network [OSTI]

    , morphology, roughness, and topography; Ruthenium; Oxygen; Single crystal surfaces 1. Introduction In additionSurface core-level shifts at an oxygen-rich Ru surface: O/Ru(0 0 0 1) vs. RuO2(1 1 0) Karsten density-functional theory calculations of Ru 3d and O 1s surface core-level shifts (SCLSs) at an oxygen

  3. Hydrogen Storage Properties of New Hydrogen-Rich BH3NH3-Metal...

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

    Storage Properties of New Hydrogen-Rich BH3NH3-Metal Hydride (TiH2, ZrH2, MgH2, andor CaH2) Composite Systems. Hydrogen Storage Properties of New Hydrogen-Rich BH3NH3-Metal...

  4. Graphene Growth by Metal Etching on Ru (0001)

    E-Print Network [OSTI]

    Loginova, Elena

    2010-01-01T23:59:59.000Z

    of step etching during graphene growth, such as in Fig. 3,adsorption of water on graphene structures will be describedRu(0001) Figure 5. a b c graphene Ru d Figure 6. Figure 7. a

  5. Adsorption of intact methanol on Ru,,0001... Pawel Gazdzicki,1

    E-Print Network [OSTI]

    Adsorption of intact methanol on Ru,,0001... Pawel Gazdzicki,1 Per Uvdal,2 and Peter Jakob1,a 1 the adsorption of methanol on the clean Ru 0001 surface at T 80 K. Thereby, clear evidence for intact adsorption upon adsorption of methanol on Ru 0001 , even at low temperatures, as well as partial recombinative

  6. The structure of energy levels in ¹?²RU 

    E-Print Network [OSTI]

    Bouttchenko, Sviatoslav Olegovich

    1998-01-01T23:59:59.000Z

    (1968). [21] C. Flaum, D. Cline, A. W. Sunyar, and O. C. Kistner, Phys. Rev. Lett. 33, 973 (1974). [22] O. Scholton, F. Iachello, and A. Arima, Ann. Phys. 115, 325 (1978); F. Iachello and A. Arima, in The Interacting Boson Model (Cambridge University... Level splitting in the two-band mixing model. 19 Total energy for Ru as a function of s for 7 = 0 and e4 ? 0 for different moments of inertia. 26 Total energy for ' Ru as a function of 7 for E = 0. 22 and E'y = 0 for different moments of inertia. 27...

  7. The structure of energy levels in ¹?²RU

    E-Print Network [OSTI]

    Bouttchenko, Sviatoslav Olegovich

    1998-01-01T23:59:59.000Z

    (1968). [21] C. Flaum, D. Cline, A. W. Sunyar, and O. C. Kistner, Phys. Rev. Lett. 33, 973 (1974). [22] O. Scholton, F. Iachello, and A. Arima, Ann. Phys. 115, 325 (1978); F. Iachello and A. Arima, in The Interacting Boson Model (Cambridge University... Level splitting in the two-band mixing model. 19 Total energy for Ru as a function of s for 7 = 0 and e4 ? 0 for different moments of inertia. 26 Total energy for ' Ru as a function of 7 for E = 0. 22 and E'y = 0 for different moments of inertia. 27...

  8. CO oxidation over Ru(0001) at near-atmospheric pressures: From chemisorbed oxygen to RuO2

    E-Print Network [OSTI]

    Goodman, Wayne

    modulation Infrared reflection absorption spectroscopy Reaction kinetics a b s t r a c t RuO2(110) was formed polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) and post-reaction Auger electronCO oxidation over Ru(0001) at near-atmospheric pressures: From chemisorbed oxygen to RuO2 Feng Gao

  9. Level structure of /sup 101/Ru from the /sup 100/Ru(d,p) reaction

    SciTech Connect (OSTI)

    Duarte, J.L.M.; Horodynski-Matsushigue, L.B.; Borello-Lewin, T.; Dietzsch, O.

    1988-08-01T23:59:59.000Z

    Energy levels of /sup 101/Ru have been studied by the /sup 100/Ru(d,p)/sup 101/Ru reaction at an incident deuteron energy of 12 MeV. Outgoing particles were momentum analyzed by a magnetic spectrograph and detected in nuclear emulsion plates, with an energy resolution of 7.5 keV. A total of 68 levels up to 3.2 MeV excitation energy was identified, about two-thirds of them reported for the first time. Experimental angular distributions were compared to distorted-wave Born approximation predictions and reduced spectroscopic factors obtained. The total l = 2 and 75% of l = 0, 4, and 5 spectroscopic strengths were located. Attention is drawn to transitions to low-lying states in /sup 101/Ru (below E/sub exc/ = 0.75 MeV) with l = 3 and l = 1 character.

  10. Hexadecapolar excitation in sup 100 Ru

    SciTech Connect (OSTI)

    Sirota, S.; Duarte, J.L.M.; Horodynski-Matsushigue, L.B.; Borello-Lewin, T. (Instituto de Fisica da Universidade de Sa Paulo, 01498 Sao Paulo, Brasil (BR))

    1989-09-01T23:59:59.000Z

    Attention is drawn to the strong collective {ital L}=4 direct excitation of the state at 2.367 MeV in {sup 100}Ru by inelastic scattering of 16 MeV protons characterized by a deformation parameter {beta}{sub 4}=0.10, one of the highest reported for any region of the mass table.

  11. Solid-State Hydriding Mechanism in the LiBH4 + MgH2 System. ...

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

    The LiBH4+MgH2 system has great potential in reversible hydrogen storage for fuel cell vehicles. However, it has always been dehydrogenated and re-hydrogenated in the liquid...

  12. Magnetic phases and structural properties in Co/Ru superlattices

    SciTech Connect (OSTI)

    Alayo, W.; Tafur, Miguel; Baggio-Saitovitch, E. [Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro 22290-180 (Brazil); Pelegrini, F. [Instituto de Fisica, Universidade Federal de Goias, Goiania 74001-970 (Brazil); Nascimento, V. P. [Centro Universitario Norte do Espirito Santo, Universidade Federal do Espirito Santo, Sao Mateus 29933-415 (Brazil)

    2009-05-01T23:59:59.000Z

    We report studies by x-ray diffraction, ferromagnetic resonance (FMR), and x-ray magnetic circular dichroism (XMCD) in Co/Ru superlattices grown by magnetron sputtering. We studied the [Co(50 A)/Ru(t{sub Ru})]{sub 20} samples, which were deposited at room temperature on Si substrates with the Ru thicknesses, t{sub Ru}, varying between 9 and 33 A. The main and secondary uniform absorption modes, observed in the FMR spectra, are associated with the Co/Ru interfaces and the bulk Co regions, respectively. The main mode becomes more intense than the secondary one for increasing t{sub Ru}. This is attributed to the roughness and/or atomic interdiffusion, which leads, with increasing t{sub Ru}, to an increasing volume of Co/Ru interfacial regions and a decreasing volume of pure Co regions. The XMCD measurements provide Co spin magnetic moments lower than the bulk Co value, confirming the presence of a Co magnetic region with a lower local effective magnetization attributed to the Co/Ru interfaces.

  13. PtRu/Carbon Nanotube Nanocomposite Synthesized in Supercritical...

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

    Synthesized in Supercritical Fluid: A Novel Electrocatalyst for Direct Methanol Fuel Cell. PtRuCarbon Nanotube Nanocomposite Synthesized in Supercritical Fluid: A Novel...

  14. Magnetic properties and microstructure of Sm-Co/?-Fe nanocomposite thick film-magnets composed of multi-layers over 700 layers

    SciTech Connect (OSTI)

    Tou, A., E-mail: bb52112226@cc.nagasaki-u.ac.jp; Morimura, T.; Nakano, M.; Yamai, T.; Fukunaga, H. [Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521 (Japan)

    2014-05-07T23:59:59.000Z

    We synthesized Sm-Co/?-Fe nanocomposite film-magnets, approximately 10??m in thickness, composed of 780 layers by the pulse laser deposition method. Transmission electron microscopic observations revealed that the synthesized film is composed of Sm-Co and ?-Fe layers with the well-controlled ?-Fe thickness of approximately 10–20?nm, which is suitable one predicted by the micromagnetic simulation. In spite of the enhanced interlayer diffusion of Fe and Co by annealing for crystallization, the (BH){sub max} value of 100?kJ/m{sup 3} was obtained at the averaged compositions of Sm/(Sm?+?Co)?=?0.16 and Fe/(Sm?+?Co?+?Fe)?=?0.47. The ?-Fe fraction for obtaining the highest (BH){sub max} value was smaller than that expected from the micromagnetic simulation. Although the annealing for crystallization lay the easy direction of magnetization in the plane, the film is not expected to have strong crystallographic texture.

  15. Multiple Pathways for Benzyl Alcohol Oxidation by RuV=O3+ and RuIV=O2+

    SciTech Connect (OSTI)

    Paul, Amit; Hull, Jonathan F; Norris, Michael R; Chen, Zuofeng; Ess, Daniel H; Concepcion, Javier J; Meyer, Thomas J

    2011-01-01T23:59:59.000Z

    Significant rate enhancements are found for benzyl alcohol oxidation by the Ru{sup V}?O{sup 3+} form of the water oxidation catalyst [Ru(Mebimpy)(bpy)(OH{sub 2})]{sup 2+} [Mebimpy = 2,6-bis(1-methylbenzimidazol-2-yl)pyridine; bpy = 2,2?-bipyridine] compared to Ru{sup IV}?O{sup 2+} and for the Ru{sup IV}?O{sup 2+} form with added bases due to a new pathway, concerted hydride proton transfer (HPT).

  16. Multiple Pathways for Benzyl Alcohol Oxidation by Ru(V)?O3+ and Ru(IV)?O2+

    SciTech Connect (OSTI)

    Paul, Amit; Hull, Jonathan F; Norris, Michael R; Chen, Zuofeng; Ess, Daniel H.; Concepcion, Javier J; Meyer, Thomas J.

    2011-01-01T23:59:59.000Z

    Significant rate enhancements are found for benzyl alcohol oxidation by the Ru{sup V}?O{sup 3+} form of the water oxidation catalyst [Ru(Mebimpy)(bpy)(OH{sub 2})]{sup 2+} [Mebimpy = 2,6-bis(1-methylbenzimidazol-2-yl)pyridine; bpy = 2,2?-bipyridine] compared to Ru{sup IV}?O{sup 2+} and for the Ru{sup IV}?O{sup 2+} form with added bases due to a new pathway involving concerted hydride proton transfer (HPT).

  17. EPR and IR studies of [Ru(NH?)?]³+-Y and [Ru(NH?)?N?]²+-Y type zeolites

    E-Print Network [OSTI]

    Leubner, Raymond Leon

    1973-01-01T23:59:59.000Z

    EPR AND IR STUDIES OF [Ru(NH ) ] -Y 3 6 AND [Ru(NE ) N ] -Y TYPE ZEOLITES 2+ A Thesis by RAYMOND LEON LEUBNER Submitted to the Graduate College of Texas A&M University in partia1 fulfillment of the requirement for the degree of MASTER... OF SCIENCE December 1973 Major Subject: Chemistry EPR AND IR STUDIES OF [Ru(NH3) ] -Y 3+ AND [Ru(NH3) N ) -Y TYPE ZEOLITES 2+ 3&2 A Thesis by RAYMOND LEON LEUBNER Approved as to style and content by: (Chairman of Committ (Head of Department) (Memb...

  18. Low energy electron bombardment induced surface contamination of Ru mirrors

    E-Print Network [OSTI]

    Harilal, S. S.

    Low energy electron bombardment induced surface contamination of Ru mirrors A. Al-Ajlonya , A., Albany, NY 12203, USA ABSTRACT The impact of secondary electrons induced contamination of the Ru surface, carbon contamination, Ruthenium capping 1. INTRODUCTION Extreme ultraviolet (EUV) radiation induced

  19. REVERSIBLE HYDROGEN STORAGE IN A LiBH{sub 4}-C{sub 60} NANOCOMPOSITE

    SciTech Connect (OSTI)

    Teprovich, J.; Zidan, R.; Peters, B.; Wheeler, J.

    2013-08-06T23:59:59.000Z

    Reversible hydrogen storage in a LiBH{sub 4}:C{sub 60} nanocomposite (70:30 wt. %) synthesized by solvent-assisted mixing has been demonstrated. During the solvent-assisted mixing and nanocomposite formation, a chemical reaction occurs in which the C{sub 60} cages are significantly modified by polymerization as well as by hydrogenation (fullerane formation) in the presence of LiBH{sub 4}. We have determined that two distinct hydrogen desorption events are observed upon rehydrogenation of the material, which are attributed to the reversible formation of a fullerane (C{sub 60}H{sub x}) as well as a LiBH4 species. This system is unique in that the carbon species (C{sub 60}) actively participates in the hydrogen storage process which differs from the common practice of melt infiltration of high surface area carbon materials with LiBH{sub 4} (nanoconfinment effect). This nanocomposite demonstrated good reversible hydrogen storage properties as well as the ability to absorb hydrogen under mild conditions (pressures as low as 10 bar H{sub 2} or temperatures as low as 150?C). The nanocomposite was characterized by TGA-RGA, DSC, XRD, LDI-TOF-MS, FTIR, 1H NMR, and APPI MS.

  20. BH-2 Mainframe Chassis 65-0200 IP-2 Iontophoresis Pump Module 65-0203

    E-Print Network [OSTI]

    BH-2 Mainframe Chassis 65-0200 IP-2 Iontophoresis Pump Module 65-0203 PPM-2 Pneumatic Pump Module Module ..............6 MS-2 Power Supply ..........................................6 IP-2 Pump Module ..............................................7-8 PPM-2 Pneumatic Pump Module ..........................9 Recommended Setup Procedure

  1. Parameter Estimation of Gravitational Waves from Precessing BH-NS Inspirals with higher harmonics

    E-Print Network [OSTI]

    R. O'Shaughnessy; B. Farr; E. Ochsner; H. S. Cho; V. Raymond; C. Kim; C. H. Lee

    2014-04-11T23:59:59.000Z

    Precessing black hole-neutron star (BH-NS) binaries produce a rich gravitational wave signal, encoding the binary's nature and inspiral kinematics. Using the lalinference\\_mcmc Markov-chain Monte Carlo parameter estimation code, we use two fiducial examples to illustrate how the geometry and kinematics are encoded into the modulated gravitational wave signal, using coordinates well-adapted to precession. Even for precessing binaries, we show the performance of detailed parameter estimation can be estimated by "effective" estimates: comparisons of a prototype signal with its nearest neighbors, adopting a fixed sky location and idealized two-detector network. We use detailed and effective approaches to show higher harmonics provide nonzero but small local improvement when estimating the parameters of precessing BH-NS binaries. That said, we show higher harmonics can improve parameter estimation accuracy for precessing binaries ruling out approximately-degenerate source orientations. Our work illustrates quantities gravitational wave measurements can provide, such as reliable component masses and the precise orientation of a precessing short gamma ray burst progenitor relative to the line of sight. "Effective" estimates may provide a simple way to estimate trends in the performance of parameter estimation for generic precessing BH-NS binaries in next-generation detectors. For example, our results suggest that the orbital chirp rate, precession rate, and precession geometry are roughly-independent observables, defining natural variables to organize correlations in the high-dimensional BH-NS binary parameter space.

  2. XRF 100316D / SN 2010bh and the Nature of Gamma Ray Burst Supernovae

    E-Print Network [OSTI]

    Cano, Z; Guidorzi, C; Kobayashi, S; Levan, A J; Tanvir, N R; Wiersema, K; D'Avanzo, P; Fruchter, A S; Garnavich, P; Gomboc, A; Gorosabel, J; Kasen, D; Kopac, D; Margutti, R; Mazzali, P A; Melandri, A; Mundell, C G; Nugent, P E; Pian, E; Smith, R J; Steele, I; Wijers, R A M J; Woosley, S E

    2011-01-01T23:59:59.000Z

    We present ground-based and HST optical and infrared observations of XRF 100316D / SN 2010bh. It is seen that the optical light curves of SN 2010bh evolve at a faster rate than the archetype GRB-SN 1998bw, but at a similar rate to SN 2006aj, a supernova that was spectroscopically linked with XRF 060218, and at a similar rate to non-GRB associated type Ic SN 1994I. We estimate the rest-frame extinction of this event from our optical data to be E(B-V)=0.18 +/- 0.08 mag. We find the V-band absolute magnitude of SN 2010bh to be M_{V}=-18.62 +/- 0.08, which is the faintest peak V-band magnitude observed to-date for a spectroscopically-confirmed GRB-SNe. When we investigate the origin of the flux at t-t_{o}=0.598 days, it is shown that the light is not synchrotron in origin, but is likely coming from the supernova shock break-out. We then use our optical and infrared data to create a quasi-bolometric light curve of SN 2010bh which we model with a simple analytical formula. The results of our modeling imply that SN ...

  3. Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

    E-Print Network [OSTI]

    Ulm, Universität

    )-supported monolayer graphene Yong Han,1 Albert K. Engstfeld,2 R. Juergen Behm,2 and James W. Evans1,3,* 1 of Pt-Ru nanoclusters (NC's) by sequential deposition of Pt and Ru on a periodically rumpled graphene. The periodic variation of the adsorption energy across the graphene sheet directs the assembly of NC

  4. MoRu/Be multilayers for extreme ultraviolet applications

    DOE Patents [OSTI]

    Bajt, Sasa C. (Livermore, CA); Wall, Mark A. (Stockton, CA)

    2001-01-01T23:59:59.000Z

    High reflectance, low intrinsic roughness and low stress multilayer systems for extreme ultraviolet (EUV) lithography comprise amorphous layers MoRu and crystalline Be layers. Reflectance greater than 70% has been demonstrated for MoRu/Be multilayers with 50 bilayer pairs. Optical throughput of MoRu/Be multilayers can be 30-40% higher than that of Mo/Be multilayer coatings. The throughput can be improved using a diffusion barrier to make sharper interfaces. A capping layer on the top surface of the multilayer improves the long-term reflectance and EUV radiation stability of the multilayer by forming a very thin native oxide that is water resistant.

  5. Critical analysis on nanostructured CoFeB synthetic orthogonal ferrimagnet

    SciTech Connect (OSTI)

    Chen, Y. S.; Lin, J. G., E-mail: jglin@ntu.edu.tw [Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan (China); Cheng, Chih-Wei; Chern, G. [Department of Physics, National Chung Cheng University, Chia-Yi 621, Taiwan (China)

    2014-09-21T23:59:59.000Z

    Critical analysis on the magnetic properties of synthetic ferrimagnet (SyF), Ta/MgO/CoFeB/Ru/CoFeB/MgO/Ta, is demonstrated via both static and dynamic techniques. With the Ru thickness being 2.3?nm, the coupling between two CoFeB layers becomes orthogonal, which can be used for spin-transfer-torque nano-oscillator (STNO). The fitting of angular dependent ferromagnetic resonance (FMR) allows the precise determination of magnetic anisotropy of each CoFeB layer, the relative magnetizations and the exchange field near the frequency of STNO applications. In addition, the mechanism of resonance broadening at out-of-plane direction is identified to be magnetic inhomogeneity by fitting the angular dependent linewidth of FMR spectra, which provides indispensable information for the future design of STNO devices.

  6. Hydrogen adsorption on Ru(001) studied by Scanning Tunneling Microscopy

    E-Print Network [OSTI]

    Tatarkhanov, Mous; Rose, Franck; Fomin, Evgeny; Ogletree, D. Frank; Salmeron, Miquel

    2008-01-01T23:59:59.000Z

    001) and first hydrogen adsorption structure with (?3×?3)R30Hydrogen adsorption on Ru(001) studied by Scanning TunnelingCA 94720 Keywords: STM, Adsorption, Dissociation; Hydrogen,

  7. Investigation of high temperature gaseous species by Knudsen cell mass spectrometry above the condensed systems Cu-Y-Ru-C, Ag-Y-Ru-C, and Au-Y- Ru-C 

    E-Print Network [OSTI]

    Wilhite, Dale Wayne

    1988-01-01T23:59:59.000Z

    using the Third-law method. In addition, the molecules Cu , RuC, and YC were investigated using the Second-law method and the Third-law method. The reactions investigated are listed below: 2 Cu (g) = Cu 2 (g) 2 Ag (g) - Ag2 (g) Ru (g) + C (graphite...) = RuC (g) (g) + 2 C (graphite) YC (g) 2 Y (g) + Au (g) = YAu (g) Y (g) + Au (g) 2 Y (g) + Cu (g) YAu (g) + Au (g) = Ycu (g) Y (g) + Cu (g) YCu (g) + Cu (g) 2 Y (g) + Ru (g) YRu (g) Y (g) + RuC (g) YRu (g) + C (graphite) The reaction enthalpies...

  8. Development of bulk-type all-solid-state lithium-sulfur battery using LiBH{sub 4} electrolyte

    SciTech Connect (OSTI)

    Unemoto, Atsushi, E-mail: unemoto@imr.tohoku.ac.jp; Ikeshoji, Tamio [WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Yasaku, Syun; Matsuo, Motoaki [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Nogami, Genki; Tazawa, Masaru; Taniguchi, Mitsugu [Mitsubishi Gas Chemicals Co., Ltd., 182 Tayuhama Shinwari, Kita-ku, Niigata 950-3112 (Japan); Orimo, Shin-ichi [WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

    2014-08-25T23:59:59.000Z

    Stable battery operation of a bulk-type all-solid-state lithium-sulfur battery was demonstrated by using a LiBH{sub 4} electrolyte. The electrochemical activity of insulating elemental sulfur as the positive electrode was enhanced by the mutual dispersion of elemental sulfur and carbon in the composite powders. Subsequently, a tight interface between the sulfur-carbon composite and the LiBH{sub 4} powders was manifested only by cold-pressing owing to the highly deformable nature of the LiBH{sub 4} electrolyte. The high reducing ability of LiBH{sub 4} allows using the use of a Li negative electrode that enhances the energy density. The results demonstrate the interface modification of insulating sulfur and the architecture of an all-solid-state Li-S battery configuration with high energy density.

  9. Termination of star formation by BH feedback in equal- and unequal-mass mergers of disk and elliptical galaxies

    E-Print Network [OSTI]

    Peter H. Johansson; Thorsten Naab; Andreas Burkert

    2008-09-19T23:59:59.000Z

    We present binary galaxy merger simulations of gas-rich disks (Sp-Sp), of early-type galaxies and disks (E-Sp, mixed mergers), and mergers of early-type galaxies (E-E, dry mergers) with varying mass ratios and different progenitor morphologies. The simulations include radiative cooling, star formation and black hole (BH) accretion and the associated feedback processes. We find for Sp-Sp mergers, that the peak star formation rate and BH accretion rate decrease and the growth timescales of the central black holes and newly formed stars increase with higher progenitor mass ratios. The termination of star formation by BH feedback in disk mergers is significantly less important for higher progenitor mass ratios (e.g. 3:1 and higher). In addition, the inclusion of BH feedback suppresses efficiently star formation in dry E-E mergers and mixed E-Sp mergers.

  10. CO2 Reduction on Supported Ru/Al2O3 Catalysts: Cluster Size Dependence...

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

    on Supported RuAl2O3 Catalysts: Cluster Size Dependence of Product Selectivity. CO2 Reduction on Supported RuAl2O3 Catalysts: Cluster Size Dependence of Product...

  11. Enhanced Magnetism in Epitaxial SrRuO3 Thin Films

    E-Print Network [OSTI]

    Grutter, A.J.

    2010-01-01T23:59:59.000Z

    Enhanced Magnetism in Epitaxial SrRuO 3 A. J. Grutter, 1, 2and their e?ects on magnetism. In this paper we demonstrateXMCD con?rmed that the magnetism originates from the Ru 4+

  12. Simulating Ru L3-edge X-ray Absorption Spectroscopy with Time...

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

    Ru L3-edge X-ray Absorption Spectroscopy with Time-Dependent Density Functional Theory: Model Complexes and Electron Simulating Ru L3-edge X-ray Absorption Spectroscopy with...

  13. Carbon-Supported bimetallic Pd-Fe catalysts for vapor-phase hydrodeoxygenation of guaiacol

    SciTech Connect (OSTI)

    Sun, Junming; Karim, Ayman M.; Zhang, He; Kovarik, Libor; Li, Xiaohong S.; Hensley, Alyssa; McEwen, Jean-Sabin; Wang, Yong

    2013-10-01T23:59:59.000Z

    Abstract Carbon supported metal catalysts (Cu/C, Fe/C, Pd/C, Pt/C, PdFe/C and Ru/C) have been prepared, characterized and tested for vapor-phase hydrodeoxygenation (HDO) of guaiacol (GUA) at atmospheric pressure. Phenol was the major intermediate on all catalysts. Over the noble metal catalysts saturation of the aromatic ring was the major pathway observed at low temperature (250 °C), forming predominantly cyclohexanone and cyclohexanol. Substantial ring opening reaction was observed on Pt/C and Ru/C at higher reaction temperatures (e.g., 350 °C). Base metal catalysts, especially Fe/C, were found to exhibit high HDO activity without ring-saturation or ring-opening with the main products being benzene, phenol along with small amounts of cresol, toluene and trimethylbenzene (TMB). A substantial enhancement in HDO activity was observed on the PdFe/C catalysts. Compared with Fe/C, the yield to oxygen-free aromatic products (i.e., benzene/toluene/TMB) on PdFe/C increased by a factor of four at 350 °C, and by approximately a factor of two (83.2% versus 43.3%) at 450 °C. The enhanced activity of PdFe/C is attributed to the formation of PdFe alloy as evidenced by STEM, EDS and TPR.

  14. 01Aniversariantes do dia: 01 ALFREDO BUENO ASSISTENTE EM ADMINISTRACAO PRA/RU

    E-Print Network [OSTI]

    Paraná, Universidade Federal do

    SANTOS COZINHEIRO RA/AP 01 MARIA CLEONICE CAMPOS COZINHEIRO PRA/RU 01 MARIA ESMERALDA SANTOS DE MORAES

  15. COSMIC EVOLUTION OF BLACK HOLES AND SPHEROIDS. IV. THE M{sub BH}-L{sub sph} RELATION

    SciTech Connect (OSTI)

    Bennert, Vardha Nicola; Treu, Tommaso; Le Bris, Alexandre; Auger, Matthew W. [Department of Physics, University of California, Santa Barbara, CA 93106 (United States); Woo, Jong-Hak; Malkan, Matthew A. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Gallagher, Sarah [Department of Physics and Astronomy, University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7 (Canada); Blandford, Roger D., E-mail: bennert@physics.ucsb.ed, E-mail: tt@physics.ucsb.ed, E-mail: mauger@physics.ucsb.ed, E-mail: woo@astro.ucla.ed, E-mail: malkan@astro.ucla.ed, E-mail: alexandrelebris@gmail.co, E-mail: sgalla4@uwo.c, E-mail: rdb@slac.stanford.ed [Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA 94305 (United States)

    2010-01-10T23:59:59.000Z

    From high-resolution images of 23 Seyfert-1 galaxies at z = 0.36 and z = 0.57 obtained with the Near-Infrared Camera and Multi-Object Spectrometer on board the Hubble Space Telescope (HST), we determine host-galaxy morphology, nuclear luminosity, total host-galaxy luminosity, and spheroid luminosity. Keck spectroscopy is used to estimate black hole mass (M{sub BH}). We study the cosmic evolution of the M{sub BH}-spheroid luminosity (L{sub sph}) relation. In combination with our previous work, totaling 40 Seyfert-1 galaxies, the covered range in BH mass is substantially increased, allowing us to determine for the first time intrinsic scatter and correct evolutionary trends for selection effects. We re-analyze archival HST images of 19 local reverberation-mapped active galaxies to match the procedure adopted at intermediate redshift. Correcting spheroid luminosity for passive luminosity evolution and taking into account selection effects, we determine that at fixed present-day V-band spheroid luminosity, M{sub BH}/L{sub sph} propor to(1 + z){sup 2.8+}-{sup 1.2}. When including a sample of 44 quasars out to z = 4.5 taken from the literature, with luminosity and BH mass corrected to a self-consistent calibration, we extend the BH mass range to over 2 orders of magnitude, resulting in M{sub BH}/L{sub sph} propor to(1 + z){sup 1.4+}-{sup 0.2}. The intrinsic scatter of the relation, assumed constant with redshift, is 0.3 +- 0.1 dex (<0.6 dex at 95% CL). The evolutionary trend suggests that BH growth precedes spheroid assembly. Interestingly, the M{sub BH}-total-host-galaxy-luminosity relation is apparently non-evolving. It hints at either a more fundamental relation or that the spheroid grows by a redistribution of stars. However, the high-z sample does not follow this relation, indicating that major mergers may play the dominant role in growing spheroids above z approx = 1.

  16. PHYSICAL REVIEW B 85, 195405 (2012) Graphene on Ru(0001): Evidence for two graphene band structures

    E-Print Network [OSTI]

    Goodman, Wayne

    2012-01-01T23:59:59.000Z

    PHYSICAL REVIEW B 85, 195405 (2012) Graphene on Ru(0001): Evidence for two graphene band structures) High-resolution photoemission illustrates that the band structure of graphene on Ru(0001) exhibits a well- defined splitting. This splitting is largest with the graphene directly on the Ru(0001) substrate

  17. Complex of transferrin with ruthenium for medical applications. [Ru 97, Ru 103

    DOE Patents [OSTI]

    Richards, P.; Srivastava, S.C.; Meinken, G.E.

    1980-11-03T23:59:59.000Z

    A novel Ruthenium-transferrin complex, prepared by reacting iron-free human transferrin dissolved in a sodium acetate solution at pH 7 with ruthenium by heating at about 40/sup 0/C for about 2 hours, and purifying said complex by means of gel chromatography with pH 7 sodium acetate as eluent. The mono- or di-metal complex produced can be used in nuclear medicine in the diagnosis and/or treatment of tumors and abscesses. Comparitive results with Ga-67-citrate, which is the most widely used tumor-localizing agent in nuclear medicine, indicate increased sensitivity of detection and greater tumor uptake with the Ru-transferrin complex.

  18. Experimental verification of the high pressure crystal structures in NH{sub 3}BH{sub 3}

    SciTech Connect (OSTI)

    Huang, Yanping; Huang, Xiaoli; Zhao, Zhonglong; Li, Wenbo; Jiang, Shuqing; Duan, Defang; Bao, Kuo; Zhou, Qiang; Liu, Bingbing; Cui, Tian, E-mail: cuitian@jlu.edu.cn [State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012 (China)

    2014-06-28T23:59:59.000Z

    A detailed high-pressure study on NH{sub 3}BH{sub 3} has been carried out using in situ synchrotron X-ray diffraction (XRD) and Raman scattering with a diamond anvil cell up to 20 and 33 GPa, respectively. The Rietveld refinement based on the XRD pattern and analysis of Raman data indicate two first-order phase transitions from the ambient pressure I4 mm structure (?-NH{sub 3}BH{sub 3}) to a high pressure Cmc2{sub 1} phase (?-NH{sub 3}BH{sub 3}) at 2.14 GPa, and further into a monoclinic P2{sub 1} (Z = 2) phase (?-NH{sub 3}BH{sub 3}) at 9.67 GPa. Fitting the measured volumetric compression data to the third order Birch-Murnaghan equation of state reveals a bulk modulus of B{sub 0} = 9.9 ± 0.5 and 17.0 ± 3.0 GPa (with fixed B{sub 0}{sup ?} = 4) for the ?-NH{sub 3}BH{sub 3} below and above 5 GPa, respectively. Still, with the splitting of the NBH rock mode in Raman experiment, it is concluded that a second-order isostructural phase transition occurs at 5 GPa. By analyzing the dihydrogen bonding framework, the origin of the isostructural phase transition is attributed to the number of dihydrogen bondings per molecule in the Cmc2{sub 1} phase increasing from 12 to 14 at 5 GPa.

  19. The Fast Evolution of SN 2010bh associated with XRF 100316D

    E-Print Network [OSTI]

    E., Felipe Olivares; Schady, Patricia; Rau, Arne; Klose, Sylvio; Krühler, Thomas; Afonso, Paulo M J; Updike, Adria C; Nardini, Marco; Filgas, Robert; Guelbenzu, Ana Nicuesa; Clemens, Christian; Elliott, Jonny; Kann, D Alexander; Rossi, Andrea; Sudilovsky, Vladimir

    2011-01-01T23:59:59.000Z

    About a decade ago the first observational evidence of the connection between supernovae and gamma-ray bursts was found. Since then, only half a dozen spectroscopically confirmed associations have been discovered and XRF 100316D/SN 2010bh lies among the latest. Starting observations at 12 hr and continuing until 80 days after the burst, GROND provided excellent photometric data of XRF 100316D/SN 2010bh in six filter bands from the optical to the near-infrared, significantly expanding the existing data set for this event. Combining GROND and Swift/UVOT+XRT data, the early SED is modelled with a blackbody and afterglow component attenuated by dust and gas absorption. The best-fit models imply a moderate host-galaxy extinction (A_V=1.2\\pm0.1 mag). Furthermore, temperature and radius evolution of the thermal component are combined with earlier measurements available from the literature. The analysis reveals a cooling envelope at an apparent initial radius of 7\\times10^11 cm, compatible with a dense wind surroundi...

  20. Biased interface between solid ion conductor LiBH{sub 4} and lithium metal: A first principles molecular dynamics study

    SciTech Connect (OSTI)

    Ikeshoji, Tamio [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan) [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan); Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568 (Japan); Ando, Yasunobu; Otani, Minoru; Tsuchida, Eiji [Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568 (Japan)] [Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba 305-8568 (Japan); Takagi, Shigeyuki; Matsuo, Motoaki [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan)] [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan); Orimo, Shin-ichi [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan) [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan); WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577 (Japan)

    2013-09-23T23:59:59.000Z

    We use first-principles molecular dynamics to study the electrochemical solid-solid interface between lithium metal and lithium electrolyte LiBH{sub 4}. An external bias is applied by using an effective screening medium. We observe large polarization in the LiBH{sub 4}, because the lithium cations in LiBH{sub 4} are shifted more on one side of the double-well potential of Li{sup +}. This results in a large potential drop in the interface region and a large double-layer capacity corresponding to ca. 70 ?F/cm{sup 2}. H-coordination to the Li atoms plays an important role in the charge-transfer reaction and ion transfer.

  1. Masses of Fe-61 and Fe-62

    E-Print Network [OSTI]

    Cossairt, J. D.; Tribble, Robert E.; Kenefick, R. A.

    1977-01-01T23:59:59.000Z

    PHYSICAL RKVIK% C VO LUMK 15, N UMBKB, 5 Masses of 'Fe and Fef MA Y 1977 J. D. Cossairt, R. E. Tribble, * and R. A. Kenefick Cyclotron Institute, Texas A AM University, College Station, Texas 77843 (Received 4 October 1976) The mass excesses... of 'Fe and Fe have been measured using the Ni(a, Be) 'Fe and Ni("B,"N) Fe reactions. The mass excesses obtained are M( 'Fe) = ?58.92 ~ 0.02 MeV and M("Fe) = ?58.85 + 0.07 MeV. The results are consistent with recent predictions from two different mass...

  2. Synthesis of Pd?Ru@Pt nanoparticles for oxygen reduction reaction in acidic electrolytes

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

    Sun, Yu; Hsieh, Yu-Chi; Chang, Li-Chung; Wu, Pu-Wei; Lee, Jyh-Fu

    2015-03-01T23:59:59.000Z

    Nanoparticles of PdRu, Pd?Ru, and Pd?Ru are synthesized and impregnated on carbon black via a wet chemical reflux process. X-ray diffraction patterns of the as-synthesized samples, PdxRu/C (x=1/3/9), suggest succesful formation of alloy without presence of individual Pd and Ru nanoparticles. Images from transmission electron microscope confirm irregularly-shaped nanoparticles with average size below 3 nm. Analysis from extended X-ray absorption fine structure on both Pd and Ru K-edge absorption profiles indicate the Ru atoms are enriched on the surface of PdxRu/C. Among these samples, the Pd?Ru/C exhibits the strongest electrocatalytic activity for oxygen reduction reaction (ORR) in an oxygen-saturated 0.1more »M aqueous HClO? solution. Subsequently, the Pd?Ru/C undegoes Cu under potential deposition, followed by a galvanic displacement reaction to deposit a Pt monolayer on the Pd?Ru surface (Pd?Ru@Pt). The Pd?Ru@Pt reveals better ORR performance than that of Pt, reaching a mass activity of 0.38 mA ?g?¹ Pt, as compared to that of commercially available Pt nanoparticles (0.107 mA ?g?¹ Pt). The mechanisms responsible for the ORR enhancement are attributed to the combined effects of lattice strain and ligand interaction. In addition, this core-shell Pd?Ru@Pt electrocatalyst represents a substantial reduction in the amount of Pt consumption and raw material cost.« less

  3. Synthesis of Pd?Ru@Pt nanoparticles for oxygen reduction reaction in acidic electrolytes

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

    Sun, Yu [National Chiao Tung Univ., Hsin-chu (Taiwan); Hsieh, Yu-Chi [Brookhaven National Lab. (BNL), Upton, NY (United States); Chang, Li-Chung [National Chiao Tung Univ., Hsin-chu (Taiwan); Wu, Pu-Wei [National Chiao Tung Univ., Hsin-chu (Taiwan); Lee, Jyh-Fu [National Synchrotron Radiation Research Center, Hsin-chu (Taiwan)

    2015-03-01T23:59:59.000Z

    Nanoparticles of PdRu, Pd?Ru, and Pd?Ru are synthesized and impregnated on carbon black via a wet chemical reflux process. X-ray diffraction patterns of the as-synthesized samples, PdxRu/C (x=1/3/9), suggest succesful formation of alloy without presence of individual Pd and Ru nanoparticles. Images from transmission electron microscope confirm irregularly-shaped nanoparticles with average size below 3 nm. Analysis from extended X-ray absorption fine structure on both Pd and Ru K-edge absorption profiles indicate the Ru atoms are enriched on the surface of PdxRu/C. Among these samples, the Pd?Ru/C exhibits the strongest electrocatalytic activity for oxygen reduction reaction (ORR) in an oxygen-saturated 0.1 M aqueous HClO? solution. Subsequently, the Pd?Ru/C undegoes Cu under potential deposition, followed by a galvanic displacement reaction to deposit a Pt monolayer on the Pd?Ru surface (Pd?Ru@Pt). The Pd?Ru@Pt reveals better ORR performance than that of Pt, reaching a mass activity of 0.38 mA ?g?¹ Pt, as compared to that of commercially available Pt nanoparticles (0.107 mA ?g?¹ Pt). The mechanisms responsible for the ORR enhancement are attributed to the combined effects of lattice strain and ligand interaction. In addition, this core-shell Pd?Ru@Pt electrocatalyst represents a substantial reduction in the amount of Pt consumption and raw material cost.

  4. Synthesis and characterization of phosphine adducts of thorium borohydride, Crystal structures of Th(BH4)4(PEt3)2 and Th(BH4)4(Me2PCH2CH2PMe2)2

    E-Print Network [OSTI]

    Girolami, Gregory S.

    Synthesis and characterization of phosphine adducts of thorium borohydride, Th(BH4)4 Crystal: Thorium Phosphine Trialkylphosphine Borohydride Tetrahydroborate Crystal structures a b s t r a c NMR spectroscopy. The results show that thorium complexes of unidentate phosphines can be made

  5. Journal of Power Sources 165 (2007) 509516 Direct NaBH4/H2O2 fuel cells

    E-Print Network [OSTI]

    Carroll, David L.

    2007-01-01T23:59:59.000Z

    Journal of Power Sources 165 (2007) 509­516 Direct NaBH4/H2O2 fuel cells George H. Mileya,e,, Nie online 5 December 2006 Abstract A fuel cell (FC) using liquid fuel and oxidizer is under investigation. H Published by Elsevier B.V. Keywords: Fuel cell; Hydrogen peroxide; Regenerative fuel cell; Sodium

  6. A candidate LiBH4 for hydrogen storage: Crystal structures and reaction mechanisms of intermediate phases

    E-Print Network [OSTI]

    Goddard III, William A.

    combustion engine for transporta- tion. A hydrogen fuel cell car needs to store at least 4 kg hydrogenA candidate LiBH4 for hydrogen storage: Crystal structures and reaction mechanisms of intermediate phases Jeung Ku Kanga and Se Yun Kim Department of Materials Science and Engineering, KAIST, Daejeon 305

  7. Dimerization Induced Deprotonation of Water on RuO2(110)

    SciTech Connect (OSTI)

    Mu, Rentao; Cantu Cantu, David; Lin, Xiao; Glezakou, Vassiliki Alexandra; Wang, Zhitao; Lyubinetsky, Igor; Rousseau, Roger J.; Dohnalek, Zdenek

    2014-10-02T23:59:59.000Z

    RuO2 has proven to be indispensable as a co-catalyst in numerous systems designed for photocatalytic water splitting. In this study we have carried out a detailed mechanistic study of water behavior on the most stable RuO2 face, RuO2(110), by employing variable temperature scanning tunneling microscopy and density functional theory calculations. We show that water monomers adsorb molecularly on Ru sites, become mobile above 238 K, diffuse along the Ru rows and form water dimers. The onset for dimer diffusion is observed at ~277 K indicating significantly higher diffusion barrier than that for monomers. More importantly, we find that water dimers deprotonate readily to form Ru-bound H3O2 and bridging OH species. The observed behavior is compared and contrasted with that observed for water on isostructural rutile TiO2(110).

  8. Investigation of high temperature gaseous species by Knudsen cell mass spectrometry above the condensed systems Cu-Y-Ru-C, Ag-Y-Ru-C, and Au-Y- Ru-C

    E-Print Network [OSTI]

    Wilhite, Dale Wayne

    1988-01-01T23:59:59.000Z

    of the total ion intensities listed in Tables 2 through 5, + + except those for RuC and YC2, were calculated by dividing the individual isotopic species by the isotopic abundance of that species according to Equation 1, where I is the total intensity of all... not be used because their mass to charge ratios overlap. For these iona, an + algebraic equation was used which compared the ratios of YC (Mass 113), YC2 (Mass 114), RuC (Mass 113), and RuC (Mass 114). The + + + calculated isotopic abundances...

  9. Synthesis of Ru/multiwalled carbon nanotubes by microemulsion for electrochemical supercapacitor

    SciTech Connect (OSTI)

    Yan Shancheng; Qu Peng; Wang Haitao; Tian Tian [State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Si Pai Lou 2, Nanjing 210096 (China); Xiao Zhongdang [State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Si Pai Lou 2, Nanjing 210096 (China)], E-mail: zdxiao@seu.edu.cn

    2008-10-02T23:59:59.000Z

    An efficient way to decorate multiwalled carbon nanotubes with Ru had been developed. In this method, Ru nanoparticles were prepared by water-in-oil reverse microemulsion, and the produced Ru anchored on MWCNTs. Transmission electron microscopy (TEM) result showed that RuO{sub 2} nanoparticles had the uniform size distribution after electrochemical oxidation. Energy dispersive X-rays (EDX) spectra elucidated the presence of ruthenium oxide in the as-prepared composites after electrochemical oxidation. Cyclic voltammetry result demonstrated that a specific capacitance of deposited ruthenium oxide electrode was significantly greater than that of the pristine MWCNTs electrode in the same medium.

  10. Water adsorption on O(2x2)/Ru(0001) from STM experiments and first-principles calculations

    E-Print Network [OSTI]

    Cabrera-Sanfelix, P.; Sanchez-Portal, D.; Mugarza, A.; Shimizu, T.K.; Salmeron, M.; Arnau, A.

    2007-01-01T23:59:59.000Z

    indicate top, hcp and fcc adsorption sites respectively. TheWater adsorption on O(2x2)/Ru(0001) from STM experiments andand experimental study of water adsorption on Ru(0001) pre-

  11. The Synthesis, Structure and Physical Properties of the Layered Ruthenocuprates RuSr2GdCu2O8 and Pb2Sr2Cu2RuO8Cl 

    E-Print Network [OSTI]

    MacLaughlin, A C; Attfield, J. Paul

    2003-01-01T23:59:59.000Z

    Studies of the structure and physical properties of the layered rutheno- cuprates RuSr2GdCu2O8 and Pb2Sr2Cu2RuO8Cl are reviewed. RuSr2GdCu2O8 is a weak ferromagnetic superconductor and doping studies have shown that it is possible to tune...

  12. Masses of Fe-61 and Fe-62 

    E-Print Network [OSTI]

    Cossairt, J. D.; Tribble, Robert E.; Kenefick, R. A.

    1977-01-01T23:59:59.000Z

    . 1O) 58.5+ 0.2 (Ref. 12) -58.935 + 0.050 (Ref. 11) Q-value determination using the Ni(' 0, Ne)6 Fe reaction. MASSES OF 'Fe Ago Fe 1689 of -59.41 MeV (Ref. 2) and -58.82 MeV (Ref. 4). The weighted average of the two Q-value de- terminations...PHYSICAL RKVIK% C VO LUMK 15, N UMBKB, 5 Masses of 'Fe and Fef MA Y 1977 J. D. Cossairt, R. E. Tribble, * and R. A. Kenefick Cyclotron Institute, Texas A AM University, College Station, Texas 77843 (Received 4 October 1976) The mass excesses...

  13. Metallic contacts with individual Ru nanowires prepared by electrochemical deposition and the suppression of superconductivity

    E-Print Network [OSTI]

    conducting. Nanowires of Ru were grown in commercial, track- etched polycarbonate membranes with a nominal. We have prepared Ru nanowires by electrochemical deposition in porous polycarbonate membranes on all super- conducting nanowires prepared by electrochemical deposi- tion have been limited to arrays

  14. Surface Science Letters Spontaneous deposition of Pd on a Ru(0 0 0 1) surface

    E-Print Network [OSTI]

    Brankovic, Stanko R.

    deposition of Pd on a Pt(1 1 1) electrode, monolayer [3], or submonolayer [4,7] coverages were reportedSurface Science Letters Spontaneous deposition of Pd on a Ru(0 0 0 1) surface S.R. Brankovic, J. Mc March 2001 Abstract Spontaneous deposition of Pd on a Ru(0 0 0 1) single crystal surface has been

  15. Dynamic Characterization of Graphene Growth and Etching by Oxygen on Ru(0001) by Photoemission Electron Microscopy

    E-Print Network [OSTI]

    Bao, Xinhe

    Dynamic Characterization of Graphene Growth and Etching by Oxygen on Ru(0001) by Photoemission of graphene on Ru(0001) was investigated by photoemission electron microscopy (PEEM) and scanning tunneling, we show that graphene overlayers with sizes ranging from nanometers to sub-millimeters have been

  16. Mechanism of water oxidation by [Ru(bda)(L)?]: The return of the "blue dimer"

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

    Concepcion, Javier J. [Brookhaven National Lab. (BNL), Upton, NY (United States); Zhong, Diane K. [Brookhaven National Lab. (BNL), Upton, NY (United States); Szalda, David J. [Baruch College, New York, NY (United States); Muckerman, James T. [Brookhaven National Lab. (BNL), Upton, NY (United States); Fujita, Etsuko [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2015-01-01T23:59:59.000Z

    We describe here a combined solution-surface-DFT calculations study for complexes of the type [Ru(bda)(L)?] including X-ray structure of intermediates, their reactivity, as well as pH-dependent electrochemistry and spectroelectrochemistry. These studies shed light on the mechanism of water oxidation by [Ru(bda)(L)?], revealing key features unavailable from solution studies with sacrificial oxidants.

  17. Low leakage Ru-strontium titanate-Ru metal-insulator-metal capacitors for sub-20?nm technology node in dynamic random access memory

    SciTech Connect (OSTI)

    Popovici, M., E-mail: Mihaela.Ioana.Popovici@imec.be; Swerts, J.; Redolfi, A.; Kaczer, B.; Aoulaiche, M.; Radu, I.; Clima, S.; Everaert, J.-L.; Van Elshocht, S.; Jurczak, M. [Imec, Leuven 3001 (Belgium)

    2014-02-24T23:59:59.000Z

    Improved metal-insulator-metal capacitor (MIMCAP) stacks with strontium titanate (STO) as dielectric sandwiched between Ru as top and bottom electrode are shown. The Ru/STO/Ru stack demonstrates clearly its potential to reach sub-20?nm technology nodes for dynamic random access memory. Downscaling of the equivalent oxide thickness, leakage current density (J{sub g}) of the MIMCAPs, and physical thickness of the STO have been realized by control of the Sr/Ti ratio and grain size using a heterogeneous TiO{sub 2}/STO based nanolaminate stack deposition and a two-step crystallization anneal. Replacement of TiN with Ru as both top and bottom electrodes reduces the amount of electrically active defects and is essential to achieve a low leakage current in the MIM capacitor.

  18. The Evolution of the M_BH-sigma relation Inferred from the Age Distribution of Local Early-Type Galaxies and AGN Evolution

    E-Print Network [OSTI]

    Shankar, Francesco; Haiman, Zoltan

    2008-01-01T23:59:59.000Z

    We utilize the local velocity dispersion function (VDF) of spheroids, together with their inferred age--distributions, to predict the VDF at higher redshifts (01.3 excluded at the 99% confidence level. A direct match between the characteristic BH mass in the VDF--based and quasar LF--based BH mass functions also yields a mean Eddington ratio of lambda ~ 0.5-1 that is roughly constant within 00.23 for alpha>1.5. abridged

  19. Surface Science Letters The 2-D growth of gold on single-layer graphene/Ru(0001): Enhancement of

    E-Print Network [OSTI]

    Goodman, Wayne

    Surface Science Letters The 2-D growth of gold on single-layer graphene/Ru(0001): Enhancement of CO online 7 May 2011 Keywords: Graphene Ru(0001) STM 2-D Au CO adsorption IRAS The growth and morphology of two-dimensional (2-D) gold islands on a single-layer graphene supported on Ru(0001) have been studied

  20. Probing temporal evolution of extreme ultraviolet assisted contamination on Ru mirror by x-ray photoelectron spectroscopy

    E-Print Network [OSTI]

    Harilal, S. S.

    of hydrocarbons8 and the oxidation of the near sur- face atomic layers of Ru eventually lead to the degradation and oxidation of the Ru mirror surface, and the corresponding impact on reflectivity were studied. In particular analyses show a slight increase in Ru oxide, whereas the concentration of water molecules decreases

  1. Enhanced Thermoelectric Power and Electronic Correlations in RuSe2

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

    Wang, Kefeng [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Wang, Aifeng [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Tomic, A. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Wang, Limin [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Abeykoon, A.M. Milinda [Brookhaven National Laboratory (BNL), Upton, NY (United States). Photon Sciences Directorate; Dooryhee, E. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Photon Sciences Directorate; Billinge, S. J.L. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Columbia Univ., New York, NY (United States); Petrovic, C. [Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

    2015-04-01T23:59:59.000Z

    We report the electronic structure, electric and thermal transport properties of Ru1-xIrxSe2 (x ? 0:2). RuSe2 is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe2 exceeds -200 ?#22;V/K around 730 K. Ir substitution results in the suppression of the resistivity and the Seebeck coefficient, suggesting the removal of the peaks in density of states near the Fermi level. Ru0.8Ir0.2Se2 shows a semiconductor-metal crossover at about 30 K. The magnetic field restores the semiconducting behavior. Our results indicate the importance of the electronic correlations in enhanced thermoelectricity of RuSb2.

  2. XRF 100316D/SN 2010bh: clue to the diverse origin of nearby supernova-associated GRBs

    E-Print Network [OSTI]

    Fan, Yi-Zhong; Xu, Dong; Liang, En-Wei; Zhang, Bing

    2010-01-01T23:59:59.000Z

    X-ray Flash (XRF) 100316D, a nearby super-long under-luminous burst with a peak energy E_p \\sim 20 keV, was detected by Swift and was found to be associated with an energetic supernova SN 2010bh. Both the spectral and the temporal behavior of this burst are rather similar to that of XRF 060218, except that the latter was associated with a "less energetic" SN 2006aj and had a prominent soft thermal emission component in the spectrum. We analyze the spectral and temporal properties of this burst, and interpret the prompt gamma-ray emission and the early X-ray plateau emission as synchrotron emission from a dissipating Poynting-flux-dominated outflow, probably powered by a magnetar with a spin period of $P \\sim 10$ ms and the polar cap magnetic field $B_{\\rm p} \\sim 3\\times 10^{15}$ G. The energetic supernova SN 2010bh associated with this burst is, however, difficult to interpret within the slow magnetar model, which implies that the nascent magnetar may spin much faster with an initial rotation period $\\sim 1$...

  3. Adsorption dynamics and angular dependency of contaminants on Ru mirror surfaces

    E-Print Network [OSTI]

    Harilal, S. S.

    Adsorption dynamics and angular dependency of contaminants on Ru mirror surfaces M. Catalfano,a) A of the adsorption dynamics and of the emission angle (h from the target surface) dependency are still scarce

  4. Search for 2? decays of 96Ru and 104Ru by ultra-low background HPGe gamma spectrometry at LNGS: final results

    E-Print Network [OSTI]

    P. Belli; R. Bernabei; F. Cappella; R. Cerulli; F. A. Danevich; S. d'Angelo; A. Incicchitti; G. P. Kovtun; N. G. Kovtun; M. Laubenstein; D. V. Poda; O. G. Polischuk; A. P. Shcherban; D. A. Solopikhin; J. Suhonen; V. I. Tretyak

    2013-02-28T23:59:59.000Z

    An experiment to search for double beta decay processes in 96Ru and 104Ru, which are accompanied by gamma rays, has been realized in the underground Gran Sasso National Laboratories of the I.N.F.N. (Italy). Ruthenium samples with masses of about (0.5-0.7) kg were measured with the help of ultra-low background high purity Ge gamma ray spectrometry. After 2162 h of data taking the samples were deeply purified to reduce the internal contamination of 40K. The last part of the data has been accumulated over 5479 h. New improved half life limits on 2\\beta+/\\epsilon \\beta+/2\\epsilon\\ processes in 96Ru have been established on the level of 10^{20} yr, in particular for decays to the ground state of 96Mo: T1/2(2\

  5. Search for 2\\beta\\ decays of 96Ru and 104Ru by ultra-low background HPGe gamma spectrometry at LNGS: final results

    E-Print Network [OSTI]

    Belli, P; Cappella, F; Cerulli, R; Danevich, F A; d'Angelo, S; Incicchitti, A; Kovtun, G P; Kovtun, N G; Laubenstein, M; Poda, D V; Polischuk, O G; Shcherban, A P; Solopikhin, D A; Suhonen, J; Tretyak, V I

    2013-01-01T23:59:59.000Z

    An experiment to search for double beta decay processes in 96Ru and 104Ru, which are accompanied by gamma rays, has been realized in the underground Gran Sasso National Laboratories of the I.N.F.N. (Italy). Ruthenium samples with masses of about (0.5-0.7) kg were measured with the help of ultra-low background high purity Ge gamma ray spectrometry. After 2162 h of data taking the samples were deeply purified to reduce the internal contamination of 40K. The last part of the data has been accumulated over 5479 h. New improved half life limits on 2\\beta+/\\epsilon \\beta+/2\\epsilon\\ processes in 96Ru have been established on the level of 10^{20} yr, in particular for decays to the ground state of 96Mo: T1/2(2\

  6. In situ Ru K-edge x-ray absorption fine structure studies of electroprecipitated ruthenium dioxide films with relevance to supercapacitor applications.

    SciTech Connect (OSTI)

    Mo, Y.; Antonio, M. R.; Stefan, I. C.; Scherson, D. A.; Chemistry; Case Western Reserve Univ.

    2000-10-26T23:59:59.000Z

    Modifications in electronic and structural aspects of RuO{sub 2} films electroprecipitated onto Au electrodes induced by changes in the applied potential have been examined in situ in aqueous 0.50 M H{sub 2}SO{sub 4} by Ru K-edge X-ray absorption spectroscopy (XAS). The Fourier transform of the k{sup 3}-weighted extended X-ray absorption fine structure (EXAFS), k{sup 3}x(k), for the film polarized at +1.20V vs RHE is characterized by two shells attributed to Ru-O and Ru-Ru interactions with average distances of 1.94(1) and 3.12(2) {angstrom}, respectively, in agreement with results obtained ex situ for Ru{sup 4+} in hydrous RuO{sub 2} by other groups. In contrast, films in the reduced state, i.e., +0.40 V vs RHE, yielded only a single shell ascribed to a Ru-O interaction at 2.02(1) {angstrom} with no evidence for a distant Ru-Ru shell. The long Ru-O distance is in agreement with that reported earlier for the hydrous Ru{sup 3+} ion [Ru-(OH{sub 2}){sub 6}]{sup 3+} in the solid state. Moreover, the difference between the average Ru-O bond lengths for the reduced and oxidized films is consistent with the difference in the ionic radii of Ru{sup 3+} and Ru{sup 4+}. On this basis it has been suggested that films in the reduced state contain Ru{sup 3+} sites, consistent with the electrochemical results, in a phase with apparently less order beyond the Ru-O coordination sphere than for hydrous RuO{sub 2}.

  7. Barrier height enhancement of Ni/GaN Schottky diode using Ru based passivation scheme

    SciTech Connect (OSTI)

    Kumar, Ashish, E-mail: dr.akmr@gmail.com; Kumar, Mukesh; Singh, R. [Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India); Kaur, Riajeet [Department of Physics, National Institute of Technology, Kurukshetra 136119 (India); Joshi, Amish G. [CSIR - National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi - 110 012 (India); Vinayak, Seema [Solid State Physical Laboratory, Timarpur, Delhi 110054 (India)

    2014-03-31T23:59:59.000Z

    Wet chemical passivation of n-GaN surface using Ru based solution has been reported. X-ray photoelectron spectroscopy characterization of the GaN surface revealed removal of surface oxides by the introduction of Ru complex species. Ni/n-GaN Schottky barrier diodes were fabricated on passivated GaN and a remarkable improvement in Schottky barrier height from 0.76?eV to 0.92?eV was observed.

  8. Interfacial electron transfer dynamics of ru(II)-polypy6ridine sensitized TiO2

    SciTech Connect (OSTI)

    Jakubikova, Elena [Los Alamos National Laboratory; Martin, Richard L [Los Alamos National Laboratory; Batista, Enrique R [Los Alamos National Laboratory; Snoeberger, Robert C [YALE UNIV.; Batista, Victor S [YALE UNIV.

    2009-01-01T23:59:59.000Z

    Quantum dynamics simulations combined with density functional theory calculations are applied to study interfacial electron transfer (IET) from pyridine-4-phosphonic acid, [Ru(tpy)(tpy(PO{sub 3}H{sub 2}))]{sup 2+} and [Ru(tpy)(bpy)(H{sub 2}O)-Ru(tpy)(tpy(PO{sub 3}H{sub 2}))]{sup 4+} into the (101) surface of anatase TiO{sub 2}. IET rate from pyridine-4-phosphonic acid attached to the nanoparticle in bidentate mode ({tau} {approx} 100 fs) is an order of magnitude faster than the IET rate of the adsorbate attached in the monodentate mode ({tau} {approx} 1 ps). Upon excitation with visible light, [Ru(tpy)(tpy(PO{sub 3}H{sub 2}))]{sup 2+} attached to TiO{sub 2} in bidentate binding mode will undergo IET with the rate of {approx} 1-10 ps, which is competitive with the excited state decay into the ground state. The probability of electron injection from [Ru(tpy)(bpy)(H{sub 2}O)-Ru(tpy)(tpy(PO{sub 3}H{sub 2}))]{sup 4+} is rather low, as the excitation with visible light localizes the excited electron in the tpy-tpy bridge, which does not have favorable coupling with the TiO{sub 2} nanoparticle. The results are relevant to better understanding of the adsorbate features important for promoting efficient interfacial electron transfer into the semiconductor.

  9. BWR - Spent Fuel Transport and Storage with the TN{sup TM}9/4 and TN{sup TM}24BH Casks

    SciTech Connect (OSTI)

    Wattez, L. [COGEMA LOGISTICS - AREVA Group (France); Marguerat, Y. [BKW FMB Energy Ltd (Switzerland); Hoesli, C. [ZWILAG Zwischenlager Wuerenlingen AG (Switzerland)

    2006-07-01T23:59:59.000Z

    The Swiss Nuclear Utilities have started in 2001 to store spent fuel in dry metallic dual-purpose casks at ZWILAG, the Swiss interim storage facility. BKW FMB Energy Ltd., the Muehleberg Nuclear Power Plant owner, is involved in this process and has elected to store its BWR spent fuel in a new high capacity dual-purpose cask, the TNeTeM24BH from the COGEMA Logistics/TRANSNUCLEAR TN{sup TM}24 family. The Muehleberg BWR spent fuels are transported by road in a medium size shuttle transport cask and then transferred to a heavy transport/storage cask (dry transfer) in the hot cell of ZWILAG site. For that purpose, COGEMA Logistics designed and supplied: - Two shuttle casks, TN{sup TM}9/4, mainly devoted to transport of spent fuel from Muehleberg NPP to ZWILAG. Licensed according to IAEA 1996, the TN{sup TM}9/4 is a 40 ton transport cask, for 7 BWR high bum-up spent fuel assemblies. - A series of new high capacity dual-purpose casks, TN{sup TM}24BH, holding 69 BWR spent fuels. Two transport campaigns took place in 2003 and 2004. For each campaign, ten TN{sup TM}9/4 round trips are performed, and one TN{sup TM}24BH is loaded. 5 additional TN{sup TM}24BH are being manufactured for BKW, and the next transport campaigns are scheduled from 2006. The TN{sup TM}24BH high capacity dual purpose cask and the TN{sup TM}9/4 transport cask characteristics and capabilities will then be detailed. (authors)

  10. miniFE Benchmark

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

    Compiling: tar xzf miniFEref1.4b.tgz cd miniFEref1.4b Edit makefile for your environment make How to Run miniFE requires three input parameters which dictate the...

  11. Adsorption of water on O(2x2)/Ru(0001): thermal stability and inhibition of dissociation by H2O-O bonding

    E-Print Network [OSTI]

    Mugarza, Aitor

    2009-01-01T23:59:59.000Z

    Adsorption of water on O(2x2)/Ru(0001): thermal stabilitySaitama 351-0198, Japan. Adsorption of water on O(2x2)/Ru(oxygen on the subsequent adsorption and reactions of water

  12. Neutron powder diffraction, and solid-state deuterium NMR analyses of Yb{sub 2}RuD{sub 6} and spectroscopic vibrational analysis of Yb{sub 2}RuD{sub 6} and Yb{sub 2}RuH{sub 6}

    SciTech Connect (OSTI)

    Moyer, Ralph O., E-mail: ralph.moyer@trincoll.edu [Department of Chemistry, Trinity College, 300 Summit Street, Hartford, CT 06106-3100 (United States); Gilson, Denis F.R. [Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A2K6 (Canada); Toby, Brian H. [Advanced Photon Source, Argonne National Laboratory, Argonne, IL 06439-4856 (United States)

    2011-07-15T23:59:59.000Z

    The crystal structure of Yb{sub 2}RuD{sub 6} has been determined by neutron powder diffraction and the results were consistent with the Fm3m (no. 225) space group, a=7.2352(18) A, with the atoms arranged according to the well-known K{sub 2}PtCl{sub 6} structure. No structural phase transition was observed in going from room temperature to 4 K. Raman spectra were not available due to fluorescence, but all fundamental bands and combination bands were assigned from FTIR and PAIR spectra only following previous studies for other alkaline earth and europium ruthenium ternary metal hydrides and deuterides. The deuterium nuclear quadrupole coupling constant, 40.9 kHz, leads to an ionic character of the Ru-D bond of 82%. - Graphical Abstract: Using PAIR (see figure above) and FTIR data spectroscopic vibrational assignments are reported for (a) Yb{sub 2}RuH{sub 6} and (b) Yb{sub 2}RuD{sub 6}. In addition, neutron powder diffraction structural elucidation data and deuterium NMR data are reported for Yb{sub 2}RuD{sub 6}. Highlights: > Yb{sub 2}RuD{sub 6} was prepared by a high temperature gas/solid phase reaction among YbD{sub 2}, Ru and D{sub 2}. > The crystal structure of Yb{sub 2}RuD{sub 6} was elucidated by powder neutron diffraction. > Yb{sub 2}RuD{sub 6} and Yb{sub 2}RuH{sub 6} were analyzed by infrared spectroscopy. > In addition, Yb{sub 2}RuD{sub 6} was analyzed with D NMR spectroscopy.

  13. Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001)

    E-Print Network [OSTI]

    Goodman, Wayne

    Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001) Ye Xu May 2011 DOI: 10.1039/c1fd00030f Au deposited on Ru(0001)-supported extended, continuous graphene. These Au islands conform to the corrugation of the underlying graphene and display commensurate moire

  14. Surface Science Letters Deposition of metal clusters on single-layer graphene/Ru(0001): Factors that govern

    E-Print Network [OSTI]

    Goodman, Wayne

    Surface Science Letters Deposition of metal clusters on single-layer graphene/Ru(0001): Factors Keywords: Graphene Ru(0001) STM Metal nanoclusters Au film Fabrication of nanoclusters on a substrate of metal on graphene have been studied by scanning tunneling microscopy (STM) based on different behaviors

  15. Organometallic Complexes that Model the Active Sites of the [FeFe]- and [Fe]-Hydrogenases 

    E-Print Network [OSTI]

    Liu, Tianbiao

    2011-02-22T23:59:59.000Z

    My research primarily focuses on biomimetics of the active sites of the [FeFe]- and [Fe]-hydrogenases (H2ase) and is classified into three parts. Part A: The one-electron oxidation of asymmetrically disubstituted FeIFeI models of the active site...

  16. Organometallic Complexes that Model the Active Sites of the [FeFe]- and [Fe]-Hydrogenases

    E-Print Network [OSTI]

    Liu, Tianbiao

    2011-02-22T23:59:59.000Z

    My research primarily focuses on biomimetics of the active sites of the [FeFe]- and [Fe]-hydrogenases (H2ase) and is classified into three parts. Part A: The one-electron oxidation of asymmetrically disubstituted FeIFeI models of the active site...

  17. Electronic and optical response of functionalized Ru(II) complexes: joint theoretical and experimental study

    SciTech Connect (OSTI)

    Kilina, Svetlana [Los Alamos National Laboratory; Tretiak, Sergei [Los Alamos National Laboratory; Sykora, Milan [Los Alamos National Laboratory; Albert, Victor [UNIV OF FLORIDA; Badaeva, Ekaterina [UNIV OF WASHINGTON; Koposov, Alexey [UNIV OF WASHINGTON

    2008-01-01T23:59:59.000Z

    New photovoltaic and photocatalysis applications have been recently proposed based on the hybrid Ru(II)-bipyridine-complex/semiconductor quantum dot systems. In order to attach the Ru(II) complex to the surface of a semiconductor, a linking bridge -- a carboxyl group -- needs to be added to one or two of the 2,2'-bipyridine (bpy) ligands. Such changes in the ligand structure affect electronic and optical properties and, consequently, the charge transfer reactivity of Ru(II)-systems. In this study, we analyze the effects brought by functionalization of bipyridine ligands with the methyl, carboxyl, and carboxilate groups on the electronic structure and optical response of the [Ru(bpy){sub 3}]{sup 2+} complex. First principle calculations based on density functional theory (DFT) and time dependent DFT (TDDFT) are used to simulate the ground and excited-state properties, respectively, of functionalized Ru-complexes in the gas phase and acetonitrile solution. In addition, an effective Frenkel exciton model is used to explain the optical activity and splitting patterns of the low-energy excited states in all molecules. All theoretical results nicely complement and allow for detailed interpretation of experimental absorption spectra of Ru-complexes that have been done in parallel with our theoretical investigations. We found that the carboxyl group breaks the degeneracy of two low-energy optically bright excited states and red-shifts the absorption spectrum, while leaves ionization and affinity energies of complexes almost unchanged. Experimental studies show that deprotonation of the carboxyl group in the Ru-complexes results in a slight blue shift and decrease of oscillator strengths of the low energy absorption peaks. Comparison of experimental and theoretical linear response spectra of deprotonated complexes demonstrate strong agreement if the theoretical calculations are performed with the addition of a dielectric continuum model. A polar solvent is found to play an important role in calculations of optical spectra: it stabilizes the energy of states localized on the carboxyl or carboxylate groups. Thus, the excited-state structure of the functionalized Ru-complexes, specifically in the case of the deprotonated functions, can be accurately modeled by TDDFT with the addition of a dielectric continuum in simulations.

  18. NiW and NiRu Bimetallic Catalysts for Ethylene Steam Reforming: Alternative Mechanisms for Sulfur Resistance

    SciTech Connect (OSTI)

    Rangan, M.; Yung, M. M.; Medlin, J. W.

    2012-06-01T23:59:59.000Z

    Previous investigations of Ni-based catalysts for the steam reforming of hydrocarbons have indicated that the addition of a second metal can reduce the effects of sulfur poisoning. Two systems that have previously shown promise for such applications, NiW and NiRu, are considered here for the steam reforming of ethylene, a key component of biomass derived tars. Monometallic and bimetallic Al{sub 2}O{sub 3}-supported Ni and W catalysts were employed for ethylene steam reforming in the presence and absence of sulfur. The NiW catalysts were less active than Ni in the absence of sulfur, but were more active in the presence of 50 ppm H{sub 2}S. The mechanism for the W-induced improvements in sulfur resistance appears to be different from that for Ru in NiRu. To probe reasons for the sulfur resistance of NiRu, the adsorption of S and C{sub 2}H{sub 4} on several bimetallic NiRu alloy surfaces ranging from 11 to 33 % Ru was studied using density functional theory (DFT). The DFT studies reveal that sulfur adsorption is generally favored on hollow sites containing Ru. Ethylene preferentially adsorbs atop the Ru atom in all the NiRu (111) alloys investigated. By comparing trends across the various bimetallic models considered, sulfur adsorption was observed to be correlated with the density of occupied states near the Fermi level while C{sub 2}H{sub 4} adsorption was correlated with the number of unoccupied states in the d-band. The diverging mechanisms for S and C{sub 2}H{sub 4} adsorption allow for bimetallic surfaces such as NiRu that enhance ethylene binding without accompanying increases in sulfur binding energy. In contrast, bimetallics such as NiSn and NiW appear to decrease the affinity of the surface for both the reagent and the poison.

  19. Charged pion production in $^{96}_{44}$Ru+$^{96}_{44}$Ru collisions at 400A and 1528A MeV

    E-Print Network [OSTI]

    B. Hong et al

    2005-01-23T23:59:59.000Z

    We present transverse momentum and rapidity spectra of charged pions in central Ru + Ru collisions at 400$A$ and 1528$A$ MeV. The data exhibit enhanced production at low transverse momenta compared to the expectations from the thermal model that includes the decay of $\\Delta(1232)$-resonances and thermal pions. Modification of the $\\Delta$-spectral function and the Coulomb interaction are necessary to describe the detailed shape of the transverse momentum spectra. Within the framework of the thermal model, the freeze-out radii of pions are similar at both beam energies. The IQMD model reproduces the shapes of the transverse momentum and rapidity spectra of pions, but the predicted absolute yields are larger than in the measurements, especially at lower beam energy.

  20. Structural and magnetic properties and superconductivity in Ba(Fe{sub 1-x}TM{sub x}){sub 2}As{sub 2}

    SciTech Connect (OSTI)

    Thaler, Alexander

    2012-07-23T23:59:59.000Z

    We studied the effects on structural and magnetic phase transitions and the emergence of superconductivity in transition metal substituted BaFe{sub 2}As{sub 2}. We grew four series of Ba(Fe{sub 1-x}TM{sub x}){sub 2}As{sub 2} (TM=Ru, Mn, Co+Cr and Co+Mn) and characterized them by crystallographic, magnetic and transport measurements. We also subjected Ba(Fe{sub 1-x}Cr{sub x}){sub 2}As{sub 2} and Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} to heat treatment to explore what changes might be induced.

  1. Magnetic properties of RT2Zn20; R = rare earth, T = Fe, Co, Ru, Os and Ir

    SciTech Connect (OSTI)

    Jia, Shuang

    2008-12-15T23:59:59.000Z

    It is well known that rare earth intermetallic compounds have versatile, magnetic properties associated with the 4f electrons: a local moment associated with the Hund's rule ground state is formed in general, but a strongly correlated, hybridized state may also appear for specific 4f electronic configuration (eg. for rare earth elements such as Ce or Yb). On the other hand, the conduction electrons in rare earth intermetallic compounds, certainly ones associated with non hybridizing rare earths, usually manifest non-magnetic behavior and can be treated as a normal, non-interacted Fermi liquid, except for some 3d-transition metal rich binary or ternary systems which often manifest strong, itinerant, d electron dominant magnetic behavior. Of particular interest are examples in which the band filling of the conduction electrons puts the system in the vicinity of a Stoner transition: such systems, characterized as nearly or weakly ferromagnet, manifest strongly correlated electronic properties [Moriya, 1985]. For rare earth intermetallic compounds, such systems provide an additional versatility and allow for the study of the behaviors of local moments and hybridized moments which are associated with 4f electron in a correlated conduction electron background.

  2. Mass Measurements of AGN from Multi-Lorentzian Models of X-ray Variability. I. Sampling Effects in Theoretical Models of the rms^2-M_BH Correlation

    E-Print Network [OSTI]

    Martin E. Pessah

    2006-10-11T23:59:59.000Z

    Recent X-ray variability studies suggest that the log of the square of the fractional rms variability amplitude, rms^2, seems to correlate with the log of the AGN black-hole mass, M_BH, with larger black holes being less variable for a fixed time interval. This has motivated the theoretical modeling of the rms^2-M_BH correlation with the aim of constraining AGN masses based on X-ray variability. A viable approach to addressing this problem is to assume an underlying power spectral density with a suitable mass dependence, derive the functional form of the rms^2-M_BH correlation for a given sampling pattern, and investigate whether the result is consistent with the observations. For simplicity, previous studies, inspired by the similarities shared by the timing properties of AGN and X-ray binaries, have explored model power spectral densities characterized by broken power laws. and ignored, in general, the distorting effects that the particular sampling pattern imprints in the observed power spectral density. Motivated by the latest timing results from X-ray binaries, obtained with RXTE, we propose that AGN broad-band noise spectra consist of a small number of Lorentzian components. This assumption allows, for the first time, to fully account for sampling effects in theoretical models of X-ray variability in an analytic manner. We show that, neglecting sampling effects when deriving the fractional rms from the model power spectral density can lead to underestimating it by a factor of up to 80% with respect to its true value for the typical sampling patterns used to monitor AGN. We discuss the implications of our results for the derivation of AGN masses using theoretical models of the rms^2-M_BH correlation. (Abridged)

  3. FE Transition Deliverables

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic Plan| Department of Energy 088:EnergyFAR27.pdfFE DOCKET NO.OilFE

  4. Missing Data Handling for Meter Data Management System Ru-Sen Jeng1

    E-Print Network [OSTI]

    Chen, Ling-Jyh

    Applications]: Types of Systems-- Decision support (e.g., MIS) Keywords Missing data, Smart meter, MDMS 1-scale deployments. As a consequence, conventional missing data handling methods are not applicable to smart meterMissing Data Handling for Meter Data Management System Ru-Sen Jeng1 , Chien-Yu Kuo1 , Yao-hua Ho1

  5. Tracking electron-induced carbon contamination and cleaning of Ru surfaces by Auger electron spectroscopy

    E-Print Network [OSTI]

    Harilal, S. S.

    Tracking electron-induced carbon contamination and cleaning of Ru surfaces by Auger electron that the EUV radiation induced surface contamination is associated with: (1) direct photo-dissociation in which-ray photoelectron spectroscopy (XPS) is commonly used for estimating carbon contamination in mirrors.11 However

  6. Core-Shell Assisted Bimetallic Assembly of Pt and Ru Nanoparticles by DNA Hybridization

    E-Print Network [OSTI]

    Lee, Jim Yang

    We have discovered that the current protocols to assemble Au nanoparticles based on DNA hybridization do not work well with the small metal nanoparticles (e.g. 5 nm Au, 3.6 nm Pt and 3.2 nm Ru particles). Further investigations ...

  7. Adsorption and transformation of tetracycline antibiotics with aluminum oxide Wan-Ru Chen 1

    E-Print Network [OSTI]

    Huang, Ching-Hua

    Adsorption and transformation of tetracycline antibiotics with aluminum oxide Wan-Ru Chen 1 , Ching) and product formation. The transformation reac- tion rate of TCs strongly correlates with adsorption to Al2O3 surfaces. Both adsorption and transformation occur at the highest rate at around neutral pH conditions

  8. Magnetotransport properties of doped RuSr2GdCu2O8 

    E-Print Network [OSTI]

    McCrone, J E; Tallon, J L; Cooper, J R; MacLaughlin, A C; Attfield, J. Paul; Bernhard, C

    2003-01-01T23:59:59.000Z

    RuSr2GdCu2O8, in which magnetic order and superconductivity coexist with Tmag>Tc , is a complex material which poses new and important questions to our understanding of the interplay between magnetic and superconducting order. Resistivity, Hall...

  9. CALIBRATING STELLAR VELOCITY DISPERSIONS BASED ON SPATIALLY RESOLVED H-BAND SPECTRA FOR IMPROVING THE M{sub BH}-{sigma}{sub *} RELATION

    SciTech Connect (OSTI)

    Kang, Wol-Rang; Woo, Jong-Hak; Park, Daeseong [Astronomy Program, Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742 (Korea, Republic of)] [Astronomy Program, Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742 (Korea, Republic of); Schulze, Andreas [Kavli Institute for Astronomy and Astrophysics, Peking University, 100871 Beijing (China)] [Kavli Institute for Astronomy and Astrophysics, Peking University, 100871 Beijing (China); Riechers, Dominik A. [Astronomy Department, Cornell University, 220 Space Science Building, Ithaca, NY 14853 (United States)] [Astronomy Department, Cornell University, 220 Space Science Building, Ithaca, NY 14853 (United States); Kim, Sang Chul [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)] [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of); Smolcic, Vernesa, E-mail: woo@astro.snu.ac.kr [Physics Department, University of Zagreb, Bijenicka cesta 32, 10002 Zagreb (Croatia)] [Physics Department, University of Zagreb, Bijenicka cesta 32, 10002 Zagreb (Croatia)

    2013-04-10T23:59:59.000Z

    To calibrate stellar velocity dispersion measurements from optical and near-IR stellar lines, and to improve the black hole mass (M{sub BH})-stellar velocity dispersion ({sigma}{sub *}) relation, we measure {sigma}{sub *} based on high-quality H-band spectra for a sample of 31 nearby galaxies, for which dynamical M{sub BH} is available in the literature. By comparing velocity dispersions measured from stellar lines in the H-band with those measured from optical stellar lines, we find no significant difference, suggesting that optical and near-IR stellar lines represent the same kinematics and that dust effect is negligible for early-type galaxies. Based on the spatially resolved rotation and velocity dispersion measurements along the major axis of each galaxy, we find that a rotating stellar disk is present for 80% of galaxies in the sample. For galaxies with a rotation component, {sigma}{sub *} measured from a single aperture spectrum can vary by up to {approx}20%, depending on the size of the adopted extraction aperture. To correct for the rotational broadening, we derive luminosity-weighted {sigma}{sub *} within the effective radius of each galaxy, providing uniformly measured velocity dispersions to improve the M{sub BH}-{sigma}{sub *} relation.

  10. Synthesis and Characterization of RuO2/poly (3,4-ethylenedioxythiophene) (PEDOT) Composite Nanotubes for Supercapacitors

    SciTech Connect (OSTI)

    Liu, Ran; Duay, Jonathon; Lane, Timothy; Lee, Sang Bok

    2010-01-01T23:59:59.000Z

    We report the synthesis of composite RuO{sub 2}/poly(3,4-ethylenedioxythiophene) (PEDOT) nanotubes with high specific capacitance and fast charging/discharging capability as well as their potential application as electrode materials for a high-energy and high-power supercapacitor. RuO{sub 2}/PEDOT nanotubes were synthesized in a porous alumina membrane by a step-wise electrochemical deposition method, and their structures were characterized using electron microscopy. Cyclic voltammetry was used to qualitatively characterize the capacitive properties of the composite RuO{sub 2}/PEDOT nanotubes. Their specific capacitance, energy density and power density were evaluated by galvanostatic charge/discharge cycles at various current densities. The pseudocapacitance behavior of these composite nanotubes originates from ion diffusion during the simultaneous and parallel redox processes of RuO{sub 2} and PEDOT. We show that the energy density (specific capacitance) of PEDOT nanotubes can be remarkably enhanced by electrodepositing RuO{sub 2} into their porous walls and onto their rough internal surfaces. The flexible PEDOT prevents the RuO{sub 2} from breaking and detaching from the current collector while the rigid RuO{sub 2} keeps the PEDOT nanotubes from collapsing and aggregating. The composite RuO{sub 2}/PEDOT nanotube can reach a high power density of 20 kW kg{sup ?1} while maintaining 80% energy density (28 Wh kg{sup ?1}) of its maximum value. This high power capability is attributed to the fast charge/discharge of nanotubular structures: hollow nanotubes allow counter-ions to readily penetrate into the composite material and access their internal surfaces, while a thin wall provides a short diffusion distance to facilitate ion transport. The high energy density originates from the RuO{sub 2}, which can store high electrical/electrochemical energy intrinsically. The high specific capacitance (1217 F g{sup ?1}) which is contributed by the RuO{sub 2} in the composite RuO{sub 2}/PEDOT nanotube is realized because of the high specific surface area of the nanotubular structures. Such PEDOT/RuO{sub 2} composite nanotube materials are an ideal candidate for the development of high-energy and high-power supercapacitors.

  11. Theoretical study of the interaction of Fe, Fe/sup +/, and FeCO with Ar

    SciTech Connect (OSTI)

    Braga, M.; Almeida, A.L.; Taft, C.A.; Hammond, B.L.; Lester W.A. Jr.

    1988-10-15T23:59:59.000Z

    Ab initio Hartree--Fock calculations were performed on FeAr and FeAr/sup +/ in order to determine the interaction of both neutral and singly-ionized Fe atoms trapped in Ar, and on ArFeCO and FeCOAr in order to ascertain the effect of an Ar matrix on the FeCO molecule. Quadrupole splittings and isomer shifts are computed using ab initio orbital populations and charge densities scaled by a relativistic factor. Good agreement between calculated and experimental hyperfine parameters is found in each case. The interaction energy for Fe/sup +/--Ar has been computed by ab initio Hartree--Fock and effective-core potential (ECP) methods. Both approaches yield a minimum between Fe/sup +/ and Ar at approximately 7.6 bohr.

  12. Microsoft Word - Chacon bh

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

    Science Highlight - October 2014 Figure 1. Cartoon overview of the CusCBFA efflux pump in the periplasm. New Method Tracks Metal-ion Movement in Periplasmic Proteins Copper is an...

  13. Microsoft Word - Squid bh

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

    Figure 1. Measured and fit resonant XRR curves measured at 8000 eV and at energies near the Mn K edge (6556 eV) and Co K edge (7727 eV). Inset shows the RSM of the film and...

  14. Microsoft Word - Squid bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Revised: April 3, 2014 1 of2P.O. BoxFigure

  15. Supporting Information for "Seasonal changes in Fe species and soluble Fe concentration in the

    E-Print Network [OSTI]

    ) ferrihydrite goethite (-FeOOH) Fe(III) oxalate Fe(III) citrate Fe(III) sulfate smectite (SWy-2) illite (IMt-1 shown. #12;2 4 6 8 10o k (A -1 ) k 3 (k) pyrite (FeS2). hematite (-Fe2O3) ferrihydrite goethite (-Fe

  16. Measurements and calculations of metastable level lifetimes in Fe X, Fe XI, Fe XII, Fe XIII, and Fe XIV 

    E-Print Network [OSTI]

    Moehs, D. P.; Bhatti, M. I.; Church, David A.

    2001-01-01T23:59:59.000Z

    Lifetimes of metastable levels in the ground term of Fe ions within the 3s(2)3p(k), k=1-5, isoelectronic sequences have been measured. These measurements were performed utilizing ions that were selected by mass to charge ratio while transported from...

  17. Measurements and calculations of metastable level lifetimes in Fe X, Fe XI, Fe XII, Fe XIII, and Fe XIV

    E-Print Network [OSTI]

    Moehs, D. P.; Bhatti, M. I.; Church, David A.

    2001-01-01T23:59:59.000Z

    Lifetimes of metastable levels in the ground term of Fe ions within the 3s(2)3p(k), k=1-5, isoelectronic sequences have been measured. These measurements were performed utilizing ions that were selected by mass to charge ratio while transported from...

  18. Relative g-factor measurements in {sup 54}Fe, {sup 56}Fe, and {sup 58}Fe

    SciTech Connect (OSTI)

    East, M. C.; Stuchbery, A. E.; Chamoli, S. K.; Kibedi, T. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Pinter, J. S.; Crawford, H. L.; Mantica, P. F. [NSCL and Department of Chemistry, Michigan State University, Michigan 48824 (United States); Wilson, A. N. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Department of Physics, Australian National University, Canberra, ACT 0200 (Australia)

    2009-02-15T23:59:59.000Z

    The g factors of the 2{sub 1}{sup +} states in {sup 54}Fe and {sup 58}Fe have been measured relative to the 2{sub 1}{sup +} state g factor of {sup 56}Fe using the transient-field technique in inverse kinematics. The results are in satisfactory agreement with recent shell model calculations in the fp model space. For {sup 56}Fe and {sup 58}Fe the g factors approach Z/A and are therefore also consistent with collective interpretations of these 2{sup +} states.

  19. Upper limit on spontaneous supercurrents in Sr2RuO4

    SciTech Connect (OSTI)

    Chung, Suk Bum

    2010-04-05T23:59:59.000Z

    It is widely believed that the perovskite Sr{sub 2}RuO{sub 4} is an unconventional superconductor with broken time reversal symmetry. It has been predicted that superconductors with broken time reversal symmetry should have spontaneously generated supercurrents at edges and domain walls. We have done careful imaging of the magnetic fields above Sr{sub 2}RuO{sub 4} single crystals using scanning Hall bar and SQUID microscopies, and see no evidence for such spontaneously generated supercurrents. We use the results from our magnetic imaging to place upper limits on the spontaneously generated supercurrents at edges and domain walls as a function of domain size. For a single domain, this upper limit is below the predicted signal by two orders of magnitude. We speculate on the causes and implications of the lack of large spontaneous supercurrents in this very interesting superconducting system.

  20. Enhanced oxygen evolution activity of IrO2 and RuO2 (100) surfaces

    SciTech Connect (OSTI)

    Stoerzinger, Kelsey [Massachusetts Institute of Technology (MIT)] [Massachusetts Institute of Technology (MIT); Qiao, Liang [ORNL] [ORNL; Biegalski, Michael D [ORNL] [ORNL; Christen, Hans M [ORNL] [ORNL; Shao-Horn, Yang [Massachusetts Institute of Technology (MIT)] [Massachusetts Institute of Technology (MIT)

    2014-01-01T23:59:59.000Z

    The activities of the oxygen evolution reaction (OER) on IrO2 and RuO2 catalysts are among the highest known to date. However, the intrinsic OER activities of surfaces with defined crystallographic orientations are not well established experimentally. Here we report that the (100) surface of IrO2 and RuO2 is more active than the (110) surface that has been traditionally explored by density functional theory studies. The relation between the OER activity and density of coordinatively undersaturated metal sites exposed on each rutile crystallographic facet is discussed. The surface-orientation dependent activities can guide the design of high-surface-area catalysts with increased activity for electrolyzers, metal-air batteries, and photoelectrochemical water splitting applications.

  1. Correlation between microstructure and thermionic electron emission from Os-Ru thin films on dispenser cathodes

    SciTech Connect (OSTI)

    Swartzentruber, Phillip D.; John Balk, Thomas, E-mail: john.balk@uky.edu [Department of Chemical and Materials Engineering, University of Kentucky, 177 F. Paul Anderson Tower, Lexington, Kentucky 40506-0046 (United States); Effgen, Michael P. [Semicon Associates, Lexington, Kentucky 40510 (United States)

    2014-07-01T23:59:59.000Z

    Osmium-ruthenium films with different microstructures were deposited onto dispenser cathodes and subjected to 1000 h of close-spaced diode testing. Tailored microstructures were achieved by applying substrate biasing during deposition, and these were evaluated with scanning electron microscopy, x-ray diffraction, and energy dispersive x-ray spectroscopy before and after close-spaced diode testing. Knee temperatures determined from the close-spaced diode test data were used to evaluate cathode performance. Cathodes with a large (10-11) Os-Ru film texture possessed comparatively low knee temperatures. Furthermore, a low knee temperature correlated with a low effective work function as calculated from the close-spaced diode data. It is proposed that the formation of strong (10-11) texture is responsible for the superior performance of the cathode with a multilayered Os-Ru coating.

  2. Time-Resolved XAFS Spectroscopic Studies of B-H and N-H Oxidative Addition to Transition Metal Catalysts Relevant to Hydrogen Storage

    SciTech Connect (OSTI)

    Bitterwolf, Thomas E. [University of Idaho

    2014-12-09T23:59:59.000Z

    Successful catalytic dehydrogenation of aminoborane, H3NBH3, prompted questions as to the potential role of N-H oxidative addition in the mechanisms of these processes. N-H oxidative addition reactions are rare, and in all cases appear to involve initial dative bonding to the metal by the amine lone pairs followed by transfer of a proton to the basic metal. Aminoborane and its trimethylborane derivative block this mechanism and, in principle, should permit authentic N-H oxidative attrition to occur. Extensive experimental work failed to confirm this hypothesis. In all cases either B-H complexation or oxidative addition of solvent C-H bonds dominate the chemistry.

  3. Metal-and hydrogen-bonding competition during water absorption on Pd(111) and Ru(0001)

    SciTech Connect (OSTI)

    Tatarkhanov, Mouslim; Ogletree, D. Frank; Rose, Franck; Mitsui, Toshiyuki; Fomin, Evgeny; Rose, Mark; Cerda, Jorge I.; Salmeron, Miquel

    2009-09-03T23:59:59.000Z

    The initial stages of water adsorption on the Pd(111) and Ru(0001) surfaces have been investigated experimentally by Scanning Tunneling Microscopy in the temperature range between 40 K and 130 K, and theoretically with Density Functional Theory (DFT) total energy calculations and STM image simulations. Below 125 K water dissociation does not occur at any appreciable rate and only molecular films are formed. Film growth starts by the formation of flat hexamer clusters where the molecules bind to the metal substrate through the O-lone pair while making H-bonds with neighboring molecules. As coverage increases, larger networks of linked hexagons are formed with a honeycomb structure, which requires a fraction of the water molecules to have their molecular plane perpendicular to the metal surface with reduced water-metal interaction. Energy minimization favors the growth of networks with limited width. As additional water molecules adsorb on the surface they attach to the periphery of existing islands, where they interact only weakly with the metal substrate. These molecules hop along the periphery of the clusters at intermediate temperatures. At higher temperatures they bind to the metal to continue the honeycomb growth. The water-Ru interaction is significantly stronger than the water-Pd interaction, which is consistent with the greater degree of hydrogen-bonded network formation and reduced water-metal bonding observed on Pd relative to Ru.

  4. Manipulating Magnetism: Ru-2(5+) Paddlewheels Devoid of Axial Interactions

    SciTech Connect (OSTI)

    Chiarella, Gina M [Texas A& M University; Cotton, F. A. [Texas A& M University; Murillo, Carlos A [Texas A& M University; Ventura, Karen [University of Texas at El Paso; Vilagran, Dino [University of Texas at El Paso; Wang, Xiaoping [ORNL

    2014-01-01T23:59:59.000Z

    Variable-temperature magnetic and structural data of two pairs of diruthenium isomers, one pair having an axial ligand and the formula Ru-2(DArF)(4)Cl (where DArF is the anion of a diarylformamidine isomer and Ar = p-anisyl or m-anisyl) and the other one being essentially identical but devoid of axial ligands and having the formula [Ru-2(DArF)(4)]BF4, show that the axial ligand has a significant effect on the electronic structure of the diruthenium unit. Variable temperature crystallographic and magnetic data as well as density functional theory calculations unequivocally demonstrate the occurrence of pi interactions between the p orbitals of the chlorine ligand and the pi* orbitals in the Ru-2(5+) units. The magnetic and structural data are consistent with the existence of combined ligand sigma/metal sigma and ligand p pi/metal-d pi interactions. Electron paramagnetic resonance data show unambiguously that the unpaired electrons are in metal-based molecular orbitals.

  5. Effect of disorder on the magnetic properties of cubic Mn{sub 2}Ru{sub x}Ga compounds: A first-principles study

    SciTech Connect (OSTI)

    Galanakis, I., E-mail: galanakis@upatras.gr [Department of Materials Science, School of Natural Sciences, University of Patras, GR-26504 Patra (Greece); Özdo?an, K., E-mail: kozdogan@yildiz.edu.tr [Department of Physics, Yildiz Technical University, 34210 ?stanbul (Turkey); ?a??o?lu, E., E-mail: e.sasioglu@fz-juelich.de; Blügel, S. [Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich (Germany)

    2014-07-21T23:59:59.000Z

    We perform first-principles electronic structure calculations to explain the anomalous magnetic behavior of the Mn{sub 2}Ru{sub x}Ga compounds upon Ru doping as shown experimentally recently by Kurt et al. [Phys. Rev. Lett. 112, 027201 (2014)]. Our results suggest that disorder caused by the distribution of the Mn and Ru atoms at various sites reproduces the experimental data. All compounds present antiparallel alignment of the neighboring Mn magnetic moments and, with the exception of Mn{sub 2}RuGa, none of them presents half metallic behavior.

  6. Biomineralization Associated with Microbial Reduction of Fe3...

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

    Associated with Microbial Reduction of Fe3+ and Oxidation of Fe2+ in Solid Minerals . Biomineralization Associated with Microbial Reduction of Fe3+ and Oxidation of Fe2+...

  7. Ion irradiation of Fe-Fe oxide core-shell nanocluster films:...

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

    irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties. Ion irradiation of Fe-Fe oxide core-shell nanocluster films:...

  8. Microstructure, mechanical property, biodegradation behavior, and biocompatibility of biodegradable FeFe2O3 composites

    E-Print Network [OSTI]

    Zheng, Yufeng

    behaviors, and in vitro biocompatibility of Fe­ Fe2O3 composites fabricated by spark plasma sintering were

  9. SCHOOL INFORMATION Santa Fe Indian School

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

    SCHOOL INFORMATION Santa Fe Indian School 1501 Cerrillos Road Santa Fe, NM 87505 P.O. Box 5340 Santa Fe, NM 87502 Main: (505) 989-6300 www.sfindianschool.org Main and only Entrance...

  10. Incoherent Bi off-centering in Bi?Ti?O?O' and Bi?Ru?O?O': Insulator versus metal

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

    Shoemaker, Daniel P.; Seshadri, Ram; Tachibana, Makoto; Hector, Andrew L.

    2011-08-01T23:59:59.000Z

    In the cubic, stoichiometric oxide compounds Bi?Ti?O?O' (also written as Bi?Ti?O?) and Bi?Ru?O?O' (also written as Bi?Ru?O?) Bi³? ions on the pyrochlore A site display a propensity to off-center. Unlike Bi?Ti?O?O', Bi?Ru?O?O' is a metal, so it is of interest to ask whether conduction electrons and/or involvement of Bi 6s states at the Fermi energy influence Bi³? displacements. The Bi³? off-centering in Bi?Ti?O?O' has previously been revealed to be incoherent from detailed reverse Monte Carlo analysis of total neutron scattering. Similar analysis of Bi?Ru?O?O' reveals incoherent off-centering as well, but of smaller magnitude and with distinctly different orientational preference. Analysis of the distributions of metal to oxygen distances presented suggests that Bi in both compounds is entirely Bi³?. Disorder in Bi?Ti?O?O' has the effect of stabilizing valence while simultaneously satisfying the steric constraint imposed by the presence of the lone pair of electrons. In Bi?Ru?O?O', off-centering is not required to satisfy valence and seems to be driven by the lone pair. Decreased volume of the lone pair may be a result of partial screening by conduction electrons.

  11. Incoherent Bi off-centering in Bi?Ti?O?O' and Bi?Ru?O?O': Insulator versus metal

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

    Shoemaker, Daniel P.; Seshadri, Ram; Tachibana, Makoto; Hector, Andrew L.

    2011-08-01T23:59:59.000Z

    In the cubic, stoichiometric oxide compounds Bi?Ti?O?O' (also written as Bi?Ti?O?) and Bi?Ru?O?O' (also written as Bi?Ru?O?) Bi³? ions on the pyrochlore A site display a propensity to off-center. Unlike Bi?Ti?O?O', Bi?Ru?O?O' is a metal, so it is of interest to ask whether conduction electrons and/or involvement of Bi 6s states at the Fermi energy influence Bi³? displacements. The Bi³? off-centering in Bi?Ti?O?O' has previously been revealed to be incoherent from detailed reverse Monte Carlo analysis of total neutron scattering. Similar analysis of Bi?Ru?O?O' reveals incoherent off-centering as well, but of smaller magnitude and with distinctly different orientational preference. Analysismore »of the distributions of metal to oxygen distances presented suggests that Bi in both compounds is entirely Bi³?. Disorder in Bi?Ti?O?O' has the effect of stabilizing valence while simultaneously satisfying the steric constraint imposed by the presence of the lone pair of electrons. In Bi?Ru?O?O', off-centering is not required to satisfy valence and seems to be driven by the lone pair. Decreased volume of the lone pair may be a result of partial screening by conduction electrons.« less

  12. Features of the band structure and conduction mechanisms in the n-HfNiSn semiconductor heavily doped with Ru

    SciTech Connect (OSTI)

    Romaka, V. A., E-mail: vromaka@polynet.lviv.ua [National Academy of Sciences of Ukraine, Pidstrygach Institute for Applied Problems in Mechanics and Mathematics (Ukraine); Rogl, P. [Universität Wien, Institut für Physikalische Chemie (Austria); Romaka, V. V. [National University Lvivska Politekhnika (Ukraine); Stadnyk, Yu. V. [Ivan Franko National University of Lviv (Ukraine); Korzh, R. O.; Krayovskyy, V. Ya. [National University Lvivska Politekhnika (Ukraine); Horyn, A. M. [Ivan Franko National University of Lviv (Ukraine)

    2014-12-15T23:59:59.000Z

    The crystal and electronic structure and energy and kinetic properties of the n-HfNiSn semiconductor heavily doped with a Ru acceptor impurity are investigated in the temperature and Ru concentration ranges T = 80–400 K and N{sub A}{sup Ru} ? 9.5 × 10{sup 19}?5.7 × 10{sup 20} cm{sup ?3} (x = 0–0.03), respectively. The mechanism of structural-defect generation is established, which changes the band gap and degree of compensation of the semiconductor and consists in the simultaneous concentration reduction and elimination of donor structural defects by means of the displacement of ?1% of Ni atoms from the Hf (4a) positions, the generation of acceptor structural defects upon the substitution of Ru atoms for Ni atoms in the 4c positions, and the generation of donor defects in the form of vacancies in the Sn (4b) positions. The calculated electronic structure of HfNi{sub 1?x}Ru{sub x}Sn is consistent with the experiment. The results obtained are discussed within the Shklovsky-Efros model for a heavily doped and compensated semiconductor.

  13. Ultrafast Magnetization Dynamics of SrRuO3 Thin Films

    SciTech Connect (OSTI)

    Langner, Matthew C

    2009-05-19T23:59:59.000Z

    Itinerant ferromagnet SrRuO3 has drawn interest from physicists due to its unusual transport and magnetic properties as well as from engineers due to its low resistivity and good lattice-matching to other oxide materials. The exact electronic structure remains a mystery, as well as details of the interactions between magnetic and electron transport properties. This thesis describes the use of time-resolved magneto-optical Kerr spectroscopy to study the ferromagnetic resonance of SrRuO3 thin films, where the ferromagnetic resonance is initiated by a sudden change in the easy axis direction in response to a pump pulse. The rotation of the easy axis is induced by laser heating, taking advantage of a temperature-dependent easy axis direction in SrRuO3 thin films. By measuring the change in temperature of the magnetic system in response to the laser pulse, we find that the specific heat is dominated by magnons up to unusually high temperature, ~;;100 K, and thermal diffusion is limited by a boundary resistance between the film and the substrate that is not consistent with standard phonon reflection and scattering models. We observe a high FMR frequency, 250 GHz, and large Gilbert damping parameter, alpha ~;; 1, consistent with strong spin-orbit coupling. We observe a time-dependent change in the easy axis direction on a ps time-scale, and we find that parameters associated with the change in easy axis, as well as the damping parameter, have a non-monotonic temperature dependence similar to that observed in anomalous Hall measurements.

  14. Metastable phase boundaries of quasicrystalline phases. [Al-Mn; Al-Ru

    SciTech Connect (OSTI)

    Follstaedt, D.M.; Knapp, J.A.

    1987-01-01T23:59:59.000Z

    The melting curve (T/sub 0/) of the metastable icosahedral phase and the liquidus of the decagonal phase of Al-Mn have been obtained for 14 to 22 at. % Mn. Icosahedral Al-Mn has a congruent melting point of 910 +- 20/sup 0/C at 20 at. % Mn, and melts approx.30/sup 0/C lower than crystalline compounds with the same composition. Icosahedral Al/sub 82/Ru/sub 18/ was determined to melt at 1260 +- 30/sup 0/C. These results were obtained by forming single-phase icosahedral alloys with ion beam mixing, and by rapid heating to accurately known temperatures with electron beams.

  15. Change in valence of Ce ions induced by hydrogen absorption : CeRu2 (*) G. X. Tessema, J. Peyrard, A. Nemoz

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    was sealed in a tantalum container and annealed at 1 100 ~C for 10 days, and at 1 300 OCI for few hours. The LaRu2 was annealed at 1 150 °C for 3 hours in the induction furnace. Different values value is due to contamination by tantalum. We are uncertain as to the reason for LaRu2

  16. Studies on catalytic and structural properties of BaRuO3 type perovskite1 material for diesel soot oxidation2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Studies on catalytic and structural properties of BaRuO3 type perovskite1 material for diesel by co-precipitation24 method and its catalytic activity has been tested for diesel soot oxidation processes and vehicle exhaust.33 Key words: BaRuO3, perovskite, diesel soot oxidation, vehicular exhaust

  17. Synthesis and thermoelectric properties of Ce(Ru0.67Rh0.33)4Sb12. Geoff D. Staneff1

    E-Print Network [OSTI]

    Asimow, Paul D.

    Synthesis and thermoelectric properties of Ce(Ru0.67Rh0.33)4Sb12. Geoff D. Staneff1 , Paul D compositions show promise for thermoelectric applications. Current work was undertaken with a nominal composition of Ce(Ru0.67Rh0.33)4Sb12 to experimentally verify its potential as an n-type thermoelectric

  18. Investigation of Double Beta Decay of 100Mo to Excited States of 100Ru

    SciTech Connect (OSTI)

    A. J. Caffrey; The NEMO-3 Collaboration

    2014-05-01T23:59:59.000Z

    Double beta decay of 100Mo to the excited states of daughter nuclei has been studied using a 600 cm3 low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic 100Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of 100Mo. The half-life for the two-neutrino double beta decay of 100Mo to the excited View the MathML source state in 100Ru is measured to be T1/2=[7.5±0.6(stat)±0.6(syst)]·1020 yr. For other (0?+2?) transitions to the View the MathML source, View the MathML source, View the MathML source, View the MathML source and View the MathML source levels in 100Ru, limits are obtained at the level of ~(0.25–1.1)·1022 yr.

  19. Spin-lozenge thermodynamics and magnetic excitations in Na3RuO4

    SciTech Connect (OSTI)

    Haraldsen, Jason T [ORNL; Stone, Matthew B [ORNL; Lumsden, Mark D [ORNL; Barnes, Ted {F E } [ORNL; Jin, Rongying [ORNL; Taylor, J. W. [ISIS Facility, Rutherford Appleton Laboratory; Fernandez-Alonso, F [ISIS Facility, Rutherford Appleton Laboratory

    2009-01-01T23:59:59.000Z

    We report inelastic and elastic neutron scattering, magnetic susceptibility, and heat capacity measurements of polycrystalline sodium ruthenate (Na3RuO4). Previous work suggests this material consists of isolated tetramers of S = 3/2 Ru5+ ions in a so-called lozenge configuration. Using a Heisenberg antiferromagnet Hamiltonian, we analytically determine the energy eigenstates for general spin S. From this model, the neutron scattering cross-sections for excitations associated with spin-3/2 tetramer configurations is determined. Comparison of magnetic susceptibility and inelastic neutron scattering results shows that the proposed lozenge model is not distinctly supported, but provides evidence that the system may be better described as a pair of non-interacting inequivalent dimers, i.e double dimers. However, the existence of long-range magnetic order below Tc ? 28 K immediately questions such a description. Although no evidence of the lozenge model is observed, future studies on single crystals may further clarify the appropriate magnetic Hamiltonian.

  20. The pure rotational spectrum of ruthenium monocarbide, RuC, and relativistic ab initio predictions

    SciTech Connect (OSTI)

    Wang, Fang; Steimle, Timothy C.; Adam, Allan G. [Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604 (United States)] [Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604 (United States); Cheng, Lan; Stanton, John F. [Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712 (United States)

    2013-11-07T23:59:59.000Z

    The J = 1 ? J = 0 and J = 2 ? J = 1 rotational transitions of ruthenium monocarbide, RuC, have been recorded using the separated field pump/probe microwave optical double resonance technique and analyzed to determine the fine and hyperfine parameters for the X{sup 1}?{sup +} state. The {sup 101}Ru(I = 5/2) electric quadrupole parameter, eq{sub 0}Q, and nuclear spin-rotation interaction parameter, C{sub I}{sup eff}, were determined to be 433.19(8) MHz and ?0.049(6) MHz, respectively. The equilibrium bond distance, r{sub e}, was determined to be 1.605485(2) Å. Hartree-Fock and coupled-cluster calculations were carried out for the properties of the X{sup 1}?{sup +} state. Electron-correlation effects are pronounced for all properties studied. It is shown that (a) the moderate scalar-relativistic contribution to eq{sub 0}Q is entirely due to the coupling between scalar-relativistic and electron-correlation effects, (b) the spin-free exact two-component theory in its one-electron variant offers a reliable and efficient treatment of scalar-relativistic effects, and (c) non-relativistic theory performs quite well for the prediction of C{sub I}{sup elec}, provided that electron correlation is treated accurately.

  1. Magnetic, transport, and structural properties of SrRuO{sub 3} thin films

    SciTech Connect (OSTI)

    Majcher, A. M. [School of Physics and CRANN, Trinity College, Dublin 2 (Ireland); Institute of Physics, Jagiellonian University Krakow, Krakow (Poland); Rode, K.; Coey, J. M. D.; Stamenov, P., E-mail: stamenov.plamen@tcd.ie [School of Physics and CRANN, Trinity College, Dublin 2 (Ireland)

    2014-05-07T23:59:59.000Z

    Thin films of the oxide ferromagnetic metal SrRuO{sub 3} (SRO) are studied, in view of their potential use within oxide-based spin electronic devices. Here, their epitaxial growth on Si-compatible SrTiO{sub 3} substrates is demonstrated by pulsed laser deposition. Detail on their initial, structural, magnetic, and magnetotransport characterisation is also provided. In particular, resistivity and Hall data are interpreted within a two/three carrier model, above T{sub C.} Below T{sub C}, some information about the anisotropy of the Fermi surface effective elipsoids (?1:4) is recovered. The low-temperature saturation magnetisation approaches 1??{sub B}/Ru, with an uniaxial anisotropy of above 0.6 MJm{sup –3}. Despite its low T{sub C} = 160?K, and in view of its relatively low carrier mobility, it is reasoned that SRO could be utilized as the electrode layer in low-temperature all-oxide-MTJ (Magnetic Tunnel Junction) demonstrators and as a seed layer for other ferromagnetic oxides, at and above room temperature.

  2. Roles of Fe2+, Fe3+, and Cr3+ Surface Sites in the Oxidation...

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

    Fe3+, and Cr3+ Surface Sites in the Oxidation of NO on the (Fe,Cr)3O4(1 1 1) Surface Termination of an -(Fe,Cr Roles of Fe2+, Fe3+, and Cr3+ Surface Sites in the Oxidation of NO...

  3. This is an electronic version of the article published as Napoleon, M.E. and King, B.H. 1999. Offspring sex ratio response to host size in the parasitoid wasp

    E-Print Network [OSTI]

    King, Bethia H.

    29 This is an electronic version of the article published as Napoleon, M.E. and King, B.H. 1999 response to host size in the parasitoid wasp Spalangia endius M. E. Napoleon1 and B. H. King M.E. Napoleon1

  4. Influence of oxide impurities on the chemical tuning of the thermoelectric properties of substitution derivatives of RuIn{sub 3}

    SciTech Connect (OSTI)

    Wagner-Reetz, Maik, E-mail: Maik.Wagner@cpfs.mpg.de; Cardoso-Gil, Raul; Schmidt, Marcus; Grin, Yuri, E-mail: Juri.Grin@cpfs.mpg.de

    2014-07-01T23:59:59.000Z

    A systematic investigation on tuning the charge carrier concentration by substitution of the Ru position in RuIn{sub 3} is performed. Samples with nominal composition Ru{sub 0.95}T{sub 0.05}In{sub 3} (T=Re, Rh, Ir) were synthesized via liquid–solid-reaction and subsequent spark plasma sintering treatment. The chemical composition was characterized by X-ray, metallographic and microstructure analysis revealing solid solutions in the samples with Rh and Ir, whereas Re cannot be incorporated in RuIn{sub 3}. Minor oxide impurities in the commercially available starting elements, the homogeneity range of RuIn{sub 3} and the redox potentials of the participating elements are the key for interpreting the observed lattice parameters and the corresponding composition. Both, substitutions with Rh or Ir and Re inclusions in RuIn{sub 3} lead independently to a significant decrease of the total thermal conductivity down to approximately one half of the value observed for binary RuIn{sub 3}, prepared with commercially available starting materials. The electrical resistivity was reduced by substitution and the temperature dependence changes from semiconductor-like, for RuIn{sub 3}, to metal-like in the substitution derivatives. At the same time the sign change in the thermopower at high temperatures, characteristic for binary RuIn{sub 3}, is suppressed, attaining only electrons as majority carriers. - Graphical abstract: Microstructure (perpendicular to the pressure axis; polarized light) of polycrystalline Ru{sub 0.95}Rh{sub 0.05}In{sub 3} (a), Ru{sub 0.95}Ir{sub 0.05}In{sub 3} (b) and Ru{sub 0.95}Re{sub 0.05}In{sub 3} (c) samples after SPS treatment. - Highlights: • Substitution solid solutions of RuIn{sub 3} were prepared via liquid–solid-reaction. • Chemistry of oxide impurities is crucial for explanation of experimental results. • Thermodynamic calculations support the observation of In{sub 2}O{sub 3} or ZnO as impurities. • Electrical resistivity is reduced by substitution. • Temperature dependence of resistivity changes from semiconductor- to metal-like.

  5. Marked Differences in Light-Switch Behavior of Ru(II) Complexes Possessing a Tridentate DNA Intercalating Ligand

    E-Print Network [OSTI]

    Turro, Claudia

    *, Department of Chemistry, The Ohio State UniVersity, Columbus, Ohio 43210, and Department of Chemistry, Uni ps). These differences are explained by the lower-energy 3 MLCT excited state present in [Ru-mail: turro@ chemistry.ohio-state.edu (C.T.), thummel@uh.edu (R.P.T.). The Ohio State University. University

  6. WORLDVIEW THEORY AND THE CONCEPTUALISATION OF SPACE Marc Schfer, Rhodes University, Grahamstown, South Africa, M.Schafer@ru.ac.za

    E-Print Network [OSTI]

    Spagnolo, Filippo

    , Grahamstown, South Africa, M.Schafer@ru.ac.za Introduction The aim of this paper and presentation is to shareMathematicsin South Africa for example, sees space and shape within a context of social experiences. One and representexperienceswithshape,space,timeand motion, using all available senses" (Republic of South Africa, 1997). This apparent

  7. Dependence of Electronic Structure of SrRuO3 and the Degree of Correlation on Cation Off-Stoichiometry

    SciTech Connect (OSTI)

    Siemons, W.

    2011-08-19T23:59:59.000Z

    We have grown and studied high quality SrRuO{sub 3} films grown by MBE as well as PLD. By changing the oxygen activity during deposition we were able to make SrRuO{sub 3} samples that were stoichiometric (low oxygen activity) or with ruthenium vacancies (high oxygen activity). Samples with strontium vacancies were found impossible to produce since the ruthenium would precipitate out as RuO{sub 2}. The volume of the unit cell of SrRuO{sub 3} becomes larger as more ruthenium vacancies are introduced. The residual resistivity ratio (RRR) and room temperature resistivity were found to systematically depend on the volume of the unit cell and therefore on the amount of ruthenium vacancies. The RRR varied from {approx}30 for stoichiometric samples to less than two for samples that were very ruthenium poor. The room temperature resistivity varied from 190 {micro}{Omega} cm for stoichoimetric samples to over 300 {micro}{Omega} cm for very ruthenium poor samples. UPS spectra show a shift of weight from the coherent peak to the incoherent peak around the Fermi level when samples have more ruthenium vacancies. Core level XPS spectra of the ruthenium 3d lines show a strong screened part in the case of stoichiometric samples. This screened part disappears when ruthenium vacancies are introduced. Both the UPS and the XPS results are consistent with the view that correlation increases as the amount of ruthenium vacancies increase.

  8. Characterization of new Co and Ru on -WC catalysts for Fischer-Tropsch reaction. Influence of the carbide surface state.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Characterization of new Co and Ru on -WC catalysts for Fischer-Tropsch reaction. Influence.griboval@univ-lille1.fr Abstract An investigation of the performances in Fischer-Tropsch reaction of 1wt% M/WC(X) (M of this natural gas induces a renewed interest for the Fischer-Tropsch reaction which is one of the major routes

  9. Characterization of new Co and Ru on -WC catalysts for Fischer-Tropsch reaction. Influence of the carbide surface state.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Characterization of new Co and Ru on -WC catalysts for Fischer-Tropsch reaction. Influence.griboval@univ-lille1.fr Abstract An investigation of the performances in Fischer-Tropsch reaction of 1wt% M/WC(X) (M wild resources crude oil. Valorization of this natural gas induces a renewed interest for the Fischer-Tropsch

  10. Density functional theory study of the mechanism of Li diffusion in rutile RuO{sub 2}

    SciTech Connect (OSTI)

    Jung, Jongboo; Cho, Maenghyo [WCU Program on Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of)] [WCU Program on Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of); Zhou, Min, E-mail: min.zhou@gatech.edu [WCU Program on Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of) [WCU Program on Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of); George W. Woodruff School of Mechanical Engineering, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405 (United States)

    2014-01-15T23:59:59.000Z

    First-principle calculations are carried out to study the diffusion of Li ions in rutile structure RuO{sub 2}, a material for positive electrodes in rechargeable Li ion batteries. The calculations focus on migration pathways and energy barriers for diffusion in Li-poor and Li-rich phases using the Nudged Elastic Band Method. Diffusion coefficients estimated based on calculated energy barriers are in good agreement with experimental values reported in the literature. The results confirm the anisotropic nature of diffusion of Li ions in one-dimensional c channels along the [001] crystalline direction of rutile RuO{sub 2} and show that Li diffusion in the Li-poor phase is faster than in the Li-rich phase. The findings of fast Li diffusion and feasible Li insertion at low temperatures in the host rutile RuO{sub 2} suggest this material is a good ionic conductor for Li transport. The finding also suggests possible means for enhancing the performance of RuO{sub 2}-based electrode materials.

  11. Electronic and optical response of Ru(II) complexes functionalized by methyl, carboxylate groups: joint theoretical and experimental study

    SciTech Connect (OSTI)

    Tretiak, Sergei [Los Alamos National Laboratory

    2008-01-01T23:59:59.000Z

    New photovoltaic and photocatalysis applications have been recently proposed based on the hybrid Ru(II)-bipyridine-complex/semiconductor quantum dot systems. In order to attach the complex to the surface of a semiconductor, a linking bridge - a carboxyl group - is added to one or two of the 2,2{prime}-bipyridine ligands. Such changes in the ligand structure, indeed, affect electronic and optical properties and consequently, the charge transfer reactivity of Ru-systems. In this study, we apply both theoretical and experimental approaches to analyze the effects brought by functionalization of bipyridine ligands with the methyl, carboxyl, and carboxilate groups on the electronic structure and optical response of the Ru(II) bipyridine complex. First principle calculations based on density functional theory (DFT) and linear response time dependent density functional theory (TDDFT) are used to simulate the ground and excited-state structures of functionalized Ru-complexes in the gas phase, as well as in acetonitrile solution. In addition, an inelaborate Frenkel exciton model is used to explain the optical activity and splitting patterns of the low-energy excited states. All theoretical results nicely complement experimental absorption spectra of Ru-complexes and contribute to their interpretation. We found that the carboxyl group breaks the degeneracy of two low-energy optically bright excited states and red-shifts the absorption spectrum, while leaves ionization and affinity energies of complexes almost unchanged. Experimental studies show a high probability of deprotonation of the carbboxyl group in the Ru-complexes resulted in a slight blue shift and decrease of intensities of the low energy absorption peaks. Comparison of experimental and theoretical linear response spectra of deprotanated complexes demonstrate strong agreement when acetonitrile solvent is used in simulations. A polar solvent is found to play an important role in calculations of optical spectra: it stabilizes the energy of states localized on the carboxyl or carboxylate groups eliminating artificial charge transport states, which typically appear in TDDFT calculations. Thus, it is validated that the excited-state structure of the functionalized Ru-complexes, specifically in the case of the deprotonated functions, can be accurately modeled by TDDFT with the addition of a dielectric continuum in simulations.

  12. CO2 Reduction on Supported Ru/Al2O3 Catalysts: Cluster Size Dependence of Product Selectivity

    SciTech Connect (OSTI)

    Kwak, Ja Hun; Kovarik, Libor; Szanyi, Janos

    2013-11-01T23:59:59.000Z

    The catalytic performance of a series of Ru/Al2O3 catalysts with Ru content in the 0.1-5% range was examined in the reduction of CO2 with H2. At low Ru loadings (?0.5 %) where the active metal phase is highly dispersed (mostly atomically) on the alumina support CO is formed with high selectivity. With increasing metal loading the selectivity toward CH4 formation increases, while that for CO production decreases. In the 0.1% Ru/Al2O3 catalyst Ru is mostly present in atomic dispersion as STEM images obtained from the fresh sample prior to catalytic testing reveal. STEM images recorded form this same sample following temperature programmed reaction test clearly show the agglomeration of small metal particles (and atoms) into 3D clusters. The clustering of the highly dispersed metal phase is responsible for the observed dramatic selectivity change during elevated temperature tests: dramatic decrease in CO, and large increase in CH4 selectivity. Apparent activation energies, estimated from the slopes of Arrhenius plots, of 82 kJ/mol and 62 kJ/mol for CO and CH4 formation were determined, respectively, regardless of Ru loading. These results suggest that the formation of CO and CH4 follow different reaction pathways, or proceed on active centers of different nature. Reactions with CO2/H2 and CO/H2 mixtures (under otherwise identical reaction conditions) reveal that the onset temperature of CO2 reduction is about 150 ºC lower than of CO reduction. We thank Dr. Feng Gao for carrying out the H2 chemisorption measurements on all the Ru/Al2O3 catalysts discussed in this work. The catalyst preparation and catalytic measurements were supported by a Laboratory Directed Research and Development (LDRD) project, while the TEM work was supported by the Chemical Imaging Initiative at the Pacific Northwest National Laboratory (PNNL). PNNL is operated for the US Department of Energy by Battelle under contract number DE-AC05-76RL01830. JHK also acknowledges the support of this work by the 2013 Research Fund of UNIST (Ulsan National Institute of Science and Technology, Ulsan, Korea).

  13. Thickness-dependent metal-insulator transition in epitaxial SrRuO? ultrathin films

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

    Shen, Xuan [Nanjing Univ. (China); Brookhaven National Lab. (BNL), Upton, NY (United States); Qiu, Xiangbiao [Nanjing Univ. (China); Su, Dong [Brookhaven National Lab. (BNL), Upton, NY (United States); Zhou, Shengqiang [Inst. of Ion Beam Physics and Materials Research, Dresden (Germany); Li., Aidong [Nanjing Univ. (China); Wu, Di [Nanjing Univ. (China)

    2015-01-07T23:59:59.000Z

    Transport characteristics of ultrathin SrRuO? films, deposited epitaxially on TiO?-terminated SrTiO? (001) single-crystal substrates, were studied as a function of film thickness. Evolution from a metallic to an insulating behavior is observed as the film thickness decreases from 20 to 4 unit cells. In films thicker than 4 unit cells, the transport behavior obeys the Drude low temperature conductivity with quantum corrections, which can be attributed to weak localization. Fitting the data with 2-dimensional localization model indicates that electron-phonon collisions are the main inelastic relaxation mechanism. In the film of 4 unit cells in thickness, the transport behavior follows variable range hopping model, indicating a strongly localized state. Magnetoresistance measurements reveal a likely magnetic anisotropy with the magnetic easy axis along the out-of-plane direction.

  14. Thickness-dependent metal-insulator transition in epitaxial SrRuO? ultrathin films

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

    Shen, Xuan; Qiu, Xiangbiao; Su, Dong; Zhou, Shengqiang; Li., Aidong; Wu, Di

    2015-01-07T23:59:59.000Z

    Transport characteristics of ultrathin SrRuO? films, deposited epitaxially on TiO?-terminated SrTiO? (001) single-crystal substrates, were studied as a function of film thickness. Evolution from a metallic to an insulating behavior is observed as the film thickness decreases from 20 to 4 unit cells. In films thicker than 4 unit cells, the transport behavior obeys the Drude low temperature conductivity with quantum corrections, which can be attributed to weak localization. Fitting the data with 2-dimensional localization model indicates that electron-phonon collisions are the main inelastic relaxation mechanism. In the film of 4 unit cells in thickness, the transport behavior follows variablemore »range hopping model, indicating a strongly localized state. Magnetoresistance measurements reveal a likely magnetic anisotropy with the magnetic easy axis along the out-of-plane direction.« less

  15. Tracing the origins of permitted emission lines in RU Lupi down to AU scales

    E-Print Network [OSTI]

    L. Podio; P. J. V. Garcia; F. Bacciotti; S. Antoniucci; B. Nisini; C. Dougados; M. Takami

    2007-11-16T23:59:59.000Z

    Most of the observed emission lines and continuum excess from young accreting low mass stars (Classical T Tauri stars -- CTTSs) take place in the star-disk or inner disk region. These regions have a complex emission topology still largely unknown. In this paper the magnetospheric accretion and inner wind contributions to the observed permitted He and H near infrared (NIR) lines of the bright southern CTTS RU Lupi are investigated for the first time. Previous optical observations of RU Lupi showed a large H-alpha profile, due to the emission from a wind in the line wings, and a micro-jet detected in forbidden lines. We extend this analysis to NIR lines through seeing-limited high spectral resolution spectra taken with VLT/ISAAC, and adaptive optics (AO) aided narrow-band imaging and low spectral resolution spectroscopy with VLT/NACO. Using spectro-astrometric analysis we investigate the presence of extended emission down to very low spatial scales (a few AU). The HeI 10830 line presents a P Cygni profile whose absorption feature indicates the presence of an inner stellar wind. Moreover the spectro-astrometric analysis evidences the presence of an extended emission superimposed to the absorption feature and likely coming from the micro-jet detected in the optical. On the contrary, the origin of the Hydrogen Paschen and Brackett lines is difficult to address. We tried tentatively to explain the observed line profiles and flux ratios with both accretion and wind models showing the limits of both approaches. The lack of spectro-astrometric signal indicates that the HI emission is either compact or symmetric. Our analysis confirms the sensitivity of the HeI line to the presence of faint extended emission regions in the close proximity of the star.

  16. fe0024360-paulsson | netl.doe.gov

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

    fe0024360-paulsson Injection and Tracking of Micro-seismic emitters to Optimize Unconventional Oil and Gas (UOG) Development Last Reviewed 6302015 DE-FE0024360 Goal The goal of...

  17. Second Harmonic Generation Studies of Fe(II) Interactions with...

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

    Second Harmonic Generation Studies of Fe(II) Interactions with Hematite (?-Fe2O3). Second Harmonic Generation Studies of Fe(II) Interactions with Hematite (?-Fe2O3)....

  18. Electronic structure of the 4d transition metal carbides: Dispersed fluorescence spectroscopy of MoC, RuC, and PdC

    E-Print Network [OSTI]

    Morse, Michael D.

    C, RuC, and PdC Ryan S. DaBell,a) Raymond G. Meyer,b) and Michael D. Morsec) Department of Chemistry fluorescence studies of the diatomic molecules MoC, RuC, and PdC are reported. New states identified in Mo are observed by dispersed fluorescence in PdC. The ground state is found to be ... 2 4 12 2 , 1

  19. Characterization of hematite (a-Fe2O3), goethite (a-FeOOH), greigite (Fe3S4), and pyrrhotite (Fe7S8) using first-order reversal

    E-Print Network [OSTI]

    Utrecht, Universiteit

    Characterization of hematite (a-Fe2O3), goethite (a-FeOOH), greigite (Fe3S4), and pyrrhotite (Fe7S8) synthetic aluminous hematite (a-Fe2-xAlxO3) and goethite (a-(FeAl)OOH) and natural greigite (Fe3S4) and pyrrhotite (Fe7S8) to constrain interpretation of FORC diagrams from natural samples. Hematite and goethite

  20. Process and genes for expression and overexpression of active [FeFe] hydrogenases

    DOE Patents [OSTI]

    Seibert, Michael; King, Paul W; Ghirardi, Maria Lucia; Posewitz, Matthew C; Smolinski, Sharon L

    2014-09-16T23:59:59.000Z

    A process for expression of active [FeFe]-hydrogenase in a host organism that does not contain either the structural gene(s) for [FeFe]-hydrogenases and/or homologues for the maturation genes HydE, HydF and HyG, comprising: cloning the structural hydrogenase gene(s) and/or the maturation genes HydE, HydF and HydG from an organisms that contains these genes into expression plasmids; transferring the plasmids into an organism that lacks a native [FeFe]-hydrogenase or that has a disrupted [FeFe]-hydrogenase and culturing it aerobically; and inducing anaerobiosis to provide [FeFe] hydrogenase biosynthesis and H?2#191 production.

  1. , 2006, . 47, 5, c. 557--567 http://www.izdatgeo.ru PP C C CX X

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    , 2006, . 47, 5, c. 557--567 http://www.izdatgeo.ru 550.834 PP C C CX X P P CP . p Republic pp c px px cx x, pcpcpxc p p p cp, c c c. c cc p P- S-, pcpcpxc px x - p. pp c p SH . px cx pp c , . . c p cpc, p c p pc - pc . c px cx c p pc p- c, cpc cc , p, c pcc cpx p

  2. Determination of structure and phase transition of light element nanocomposites in mesoporous silica: case study of NH3BH3 in MCM-41

    SciTech Connect (OSTI)

    Kim, Hyun Jeong; Karkamkar, Abhijeet J.; Autrey, Thomas; Chupas, Peter; Proffen, Thomas E.

    2009-09-30T23:59:59.000Z

    The structure of ammonia borane (AB), NH3BH3, infused in mesoporous silica MCM-41 and its evolution over the temperature range of 80 to 300 K was investigated using the atomic pair distribution function (PDF) analysis of synchrotron X-ray powder diffraction data in order to understand the origin of improved dehydrogenation properties of the system. Our study shows how X-ray PDF analysis can be used to elucidate the structure of light guest species loaded in mesoporous silica materials despite of its low scattering power of composed elements (N, B, and H) compared to its host (SiO2). PDF analyses of two AB-loaded compositions with weight ratio AB:MCM-41=1:1 and 3:1 provide a strong evidence that AB aggregate, previously found in AB:MCM-41?1:1 samples, is same species as neat AB. For both of them an orthorhombic to tetragonal structural phase transition occurs at 225 K on warming. On the other hand, AB residing inside meso-pores, which is found in AB:MCM-41=1:2 sample, does not undergo such phase transition. It rather stays in tetragonal phase over a wide temperature range of 110 to 240 K and starts to lose structural correlation above 240 K. This strongly suggests that nano-confinement of AB inside meso-pores stabilizes high temperature tetragonal phase at much lower temperature. These results provide important clues to two critical questions: why nan-compositions of AB leads dehydrogenation to lower temperature and why the neat AB like propoerties are recovered at high AB loading samples. This work was supported by the US Department of Energy Office of Basic Energy Sciences, Chemical Sciences program. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.

  3. Radiation effects on interface reactions of U/Fe, U/(Fe + Cr), and U/(Fe + Cr + Ni)

    SciTech Connect (OSTI)

    KUn Shao; Di Chen; Chaochen Wei; Michael S. Martin; Xuemei Wang; Youngjoo Park; Ed Dein; Kevin R. Coffey; b , Yongho Sohn; Bulent H. Sencer; J. Rory Kennedy

    2014-09-01T23:59:59.000Z

    We study the effects of radiation damage on interdiffusion and intermetallic phase formation at the interfaces of U/Fe, U/(Fe + Cr), and U/(Fe + Cr + Ni) diffusion couples. Magnetron sputtering is used to deposit thin films of Fe, Fe + Cr, or Fe + Cr + Ni on U substrates to form the diffusion couples. One set of samples are thermally annealed under high vacuum at 450 C or 550 C for one hour. A second set of samples are annealed identically but with concurrent 3.5 MeV Fe++ ion irradiation. The Fe++ ion penetration depth is sufficient to reach the original interfaces. Rutherford backscattering spectrometry analysis with high fidelity spectral simulations is used to obtain interdiffusion profiles, which are used to examine differences in U diffusion and intermetallic phase formation at the buried interfaces. For all three diffusion systems, Fe++ ion irradiations enhance U diffusion. Furthermore, the irradiations accelerate the formation of intermetallic phases. In U/Fe couples, for example, the unirradiated samples show typical interdiffusion governed by Fick’s laws, while the irradiated ones show step-like profiles influenced by Gibbs phase rules.

  4. Microsoft Word - Nitrogenase2015 bh

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

    CO-binding to the Active Site of Nitrogenase All living organisms depend on the availability of nitrogen for incorporation into the basic biological building blocks such as...

  5. Microsoft Word - Nitrogenase2015 bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Project0 FOIAneutronMeetingINLHanford

  6. Fe-containing phases in hydrated cements

    SciTech Connect (OSTI)

    Dilnesa, B.Z., E-mail: belay.dilnesa@gmail.com [Empa, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600 Dübendorf (Switzerland); Wieland, E. [Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI (Switzerland); Lothenbach, B. [Empa, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600 Dübendorf (Switzerland); Dähn, R. [Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI (Switzerland); Scrivener, K.L. [Ecole Polytechnique Federal de Lausanne (EPFL), Laboratory for Construction Materials, 1015 Lausanne (Switzerland)

    2014-04-01T23:59:59.000Z

    In this study synchrotron X-ray absorption spectroscopy (XAS) has been applied, an element specific technique which allows Fe-containing phases to be identified in the complex mineral mixture of hydrated cements. Several Fe species contributed to the overall Fe K-edge spectra recorded on the cement samples. In the early stage of cement hydration ferrite was the dominant Fe-containing mineral. Ferrihydrite was detected during the first hours of the hydration process. After 1 day the formation of Al- and Fe-siliceous hydrogarnet was observed, while the amount of ferrihydrite decreased. The latter finding agrees with thermodynamic modeling, which predicts the formation of Fe-siliceous hydrogarnet in Portland cement systems. The presence of Al- and Fe-containing siliceous hydrogarnet was further substantiated in the residue of hydrated cement by performing a selective dissolution procedure. - Highlights: • Fe bound to ferrihydrite at early age hydration • Fe found to be stable in siliceous hydrogarnet at longer term age hydration • Fe-containing AFt and AFm phases are less stable than siliceous hydrogarnet. • The study demonstrates EXAFS used to identify amorphous or poorly crystalline phases.

  7. Interstitial Fe in MgO

    SciTech Connect (OSTI)

    Mølholt, T. E., E-mail: tem4@hi.is; Gislason, H. P.; Ólafsson, S. [Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík (Iceland); Mantovan, R. [Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20846 Agrate Brianza (MB) (Italy); Gunnlaugsson, H. P.; Svane, A.; Weyer, G. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Masenda, H.; Naidoo, D. [School of Physics, University of the Witwatersrand, WITS 2050 (South Africa); Bharuth-Ram, K. [Durban University of Technology, Durban 4001 (South Africa); Fanciulli, M. [Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20846 Agrate Brianza (MB) (Italy); Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Milano (Italy); Johnston, K. [PH Department, ISOLDE/CERN, 1211 Geneva 23 (Switzerland); Langouche, G. [Instituut voor Kern-en Stralings fysika, University of Leuven, B-3001 Leuven (Belgium); Sielemann, R. [Helmholtz-Zentrum-Berlin für Materialien und Energie, D-14109 Berlin (Germany)

    2014-01-14T23:59:59.000Z

    Isolated {sup 57}Fe atoms were studied in MgO single-crystals by emission Mössbauer spectroscopy following implantation of {sup 57}Mn decaying to {sup 57}Fe. Four Mössbauer spectral components were found corresponding to different Fe lattice positions and/or charge states. Two components represent Fe atoms substituting Mg as Fe{sup 2+} and Fe{sup 3+}, respectively; a third component is due to Fe in a strongly implantation-induced disturbed region. The fourth component, which is the focus of this paper, can be assigned to Fe at an interstitial site. Comparison of its measured isomer shift with ab initio calculations suggests that the interstitial Fe is located on, or close to, the face of the rock-salt MgO structure. To harmonize such an assignment with the measured near-zero quadrupole interaction a local motion process (cage motion) of the Fe has to be stipulated. The relation of such a local motion as a starting point for long range diffusion is discussed.

  8. Transmission electron microscopy study on Co/Fe interdiffusion in SmCo5/Fe and Sm2Co7/Fe/Sm2Co7 thin films

    E-Print Network [OSTI]

    Liu, J. Ping

    Transmission electron microscopy study on Co/Fe interdiffusion in SmCo5/Fe and Sm2Co7/Fe/Sm2Co7 at the interface of an as-deposited SmCo5/Fe bilayer, while annealing results in measurable Co/Fe interdiffusion near the boundary. For the annealed SmCo5/Fe bilayer, phase separation occurs within the bcc

  9. Crystal structure, oxidation state and magnetism of Sr{sub x}La{sub 2?x}Cu{sub 0.5}Ru{sub 0.5}O{sub 4} (x=1, 1.5)

    SciTech Connect (OSTI)

    Lü, Minfeng, E-mail: m.f.lv@ciac.jl.cn [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Deng, Xiaolong [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Waerenborgh, João C. [IST/ITN, Instituto Superior Técnico, Univ Técnica de Lisboa, CFMC-UL, EN 10, 2686-953 Sacavém (Portugal); Wu, Xiaojie [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China); Meng, Jian, E-mail: jmeng@ciac.jl.cn [State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)

    2014-03-15T23:59:59.000Z

    Sr{sub x}La{sub 2?x}Cu{sub 0.5}Ru{sub 0.5}O{sub 4} (x=1, 1.5) oxides with K{sub 2}NiF{sub 4}-type structure were prepared by solid state reaction and characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, magnetic and electrical resistivity measurements. The SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4} phase was obtained for the first time with a negligible amount of impurities. The octahedral Cu/RuO{sub 6} units are more elongated in SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4} than in Sr{sub 1.5}La{sub 0.5}Cu{sub 0.5}Ru{sub 0.5}O{sub 4} indicating a greater extent of static Jahn–Teller distortion. XPS suggests that mixed ion pairs Ru{sup 5+}/Ru{sup 4+}?Cu{sup +}/Cu{sup 2+} are present in SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4}, while Ru remains as Ru{sup 5+} and Cu as Cu{sup 2+} in Sr{sub 1.5}La{sub 0.5}Cu{sub 0.5}Ru{sub 0.5}O{sub 4}. Both samples show spin-glass behavior, which can be explained by competition between ferromagnetic and antiferromagnetic superexchange interactions. The negative Weiss temperature estimated for SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4}, ?318 K, is significantly lower than ?11.5 K deduced for Sr{sub 1.5}La{sub 0.5}Cu{sub 0.5}Ru{sub 0.5}O{sub 4} which may be related to the higher static Jahn–Teller distortion in the former oxide. -- Graphical abstract: SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4} with K{sub 2}NiF{sub 4}-type structure show a larger static Jahn–Teller distortion than Sr{sub 1.5}La{sub 0.5}Cu{sub 0.5}Ru{sub 0.5}O{sub 4}, which may be related to stronger antiferromagnetic superexchange interactions. Highlights: • SrLaCu{sub 0.5}Ru{sub 0.5}O{sub 4} (I) larger Jahn–Teller (J–T) distortion than Sr{sub 1.5}La{sub 0.5}Cu{sub 0.5}Ru{sub 0.5}O{sub 4} (II). • Octahedral Cu/RuO{sub 6} units are more elongated in I than in II. • Mixed ion pairs Ru{sup 5+}/Ru{sup 4+}?Cu{sup +}/Cu{sup 2+} are present in I, while Ru remains as Ru{sup 5+} and Cu as Cu{sup 2+} in II. • Negative Weiss temperature of I significantly lower, consistent with higher J–T distortion.

  10. Fe/Au Multilayers: Structure and Magnetoresistance

    SciTech Connect (OSTI)

    Singh, Surendra; Basu, Saibal; Bhattacharya, D. [Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400085 (India); Prajapat, C. L. [Technical Physics Division, Bhabha Atomic Research Center, Mumbai 400085 (India); Gupta, M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 017 (India)

    2011-07-15T23:59:59.000Z

    We have measured the magnetoresistance (MR) in two sets of Fe/Au multilayers, with varying (1) Fe layer thickness, t{sub Fe} = 3-10 nm, and (2) Au layer thickness t{sub Au} = 5-15 nm, grown on Si substrates by sputtering. The multilayer interface structure and magnetic properties were studied by polarized neutron reflectometry (PNR). The study was undertaken to understand the correlation between structure of these multilayers and their magneto-transport properties.

  11. Identification of Highly Active Fe Sites in (Ni,Fe)OOH for Electrocata...

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

    enhanced OER activity in Fe-doped -NiOOH, in which Fe sites have near-optimum binding energies for OER intermediates. The conversion of solar energy and water to hydrogen is a...

  12. Bimagnetic Core/Shell FePt/Fe3O4 Nanoparticles

    E-Print Network [OSTI]

    Wang, Zhong L.

    and H2S.11,12 Procedures leading to novel inorganic core/shell structures with controlled dimensions nanoparticles, FePt and Fe3O4, followed by reduc- tive annealing to remove organic surfactant around each

  13. Reductive Biotransformation of Fe in Shale-Limestone Saprolite Containing Fe(III) Oxides and Fe(II)/Fe(III) Phyllosilicates

    SciTech Connect (OSTI)

    Kukkadapu, Ravi K.; Zachara, John M.; Fredrickson, Jim K.; McKinley, James P.; Kennedy, David W.; Smith, Steven C.; Dong, Hailiang

    2006-07-15T23:59:59.000Z

    A <2.0-mm fraction of a mineralogically complex subsurface sediment containing goethite and Fe(II)/Fe(III) phyllosilicates was incubated with Shewanella putrefaciens (strain CN32) and lactate at circumneutral pH under anoxic conditions to investigate electron acceptor preference and the nature of the resulting biogenic Fe(II) fraction. Anthraquinone-2,6-disulfonate (AQDS), an electron shuttle, was included in select treatments to enhance bioreduction and subsequent biomineralization. The sediment was highly aggregated and contained two distinct clast populations: i) a highly weathered one with “sponge-like” internal porosity, large mineral crystallites, and Fe-containing micas, and ii) a dense, compact one with fine-textured Fe-containing illite and nano-sized goethite, as revealed by various forms of electron microscopic analyses. Approximately 10 to 15% of the Fe(III)TOT was bioreduced by CN32 over 60 d in media without AQDS, whereas 24% and 35% of the Fe(III)TOT was bioreduced by CN32 after 40 and 95 d in media with AQDS. Little or no Fe2+, Mn, Si, Al, and Mg were evident in aqueous filtrates after reductive incubation. Mössbauer measurements on the bioreduced sediments indicated that both goethite and phyllosilicate Fe(III) were partly reduced without bacterial preference. Goethite was more extensively reduced in the presence of AQDS whereas phyllosilicate Fe(III) reduction was not influenced by AQDS. Biogenic Fe(II) resulting from phyllosilicate Fe(III) reduction remained in a layer-silicate environment that displayed enhanced solubility in weak acid. The mineralogic nature of the goethite biotransformation product was not determined. Chemical and cryogenic Mössbauer measurements, however, indicated that the transformation product was not siderite, green rust, magnetite, Fe(OH)2, or Fe(II) adsorbed on phyllosilicate or bacterial surfaces. Several lines of evidence suggested that biogenic Fe(II) existed as surface associated phase on the residual goethite, and/or as a Fe(II)-Al coprecipitate. Sediment aggregation and mineral physical and/or chemical factors were demonstrated to play a major role on the nature and location of the biotransformation reaction and its products.

  14. Fe-V redox flow batteries

    DOE Patents [OSTI]

    Li, Liyu; Kim, Soowhan; Yang, Zhenguo; Wang, Wei; Zhang, Jianlu; Chen, Baowei; Nie, Zimin; Xia, Guanguang

    2014-07-08T23:59:59.000Z

    A redox flow battery having a supporting solution that includes Cl.sup.- anions is characterized by an anolyte having V.sup.2+ and V.sup.3+ in the supporting solution, a catholyte having Fe.sup.2+ and Fe.sup.3+ in the supporting solution, and a membrane separating the anolyte and the catholyte. The anolyte and catholyte can have V cations and Fe cations, respectively, or the anolyte and catholyte can each contain both V and Fe cations in a mixture. Furthermore, the supporting solution can contain a mixture of SO.sub.4.sup.2- and Cl.sup.- anions.

  15. fe0024292-gti | netl.doe.gov

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

    Resources - Field Labs Hydraulic Fracturing Test Site (HFTS) Last Reviewed 6292015 DE-FE0024292 Goal This project is to conduct a field-based hydraulic fracturing research...

  16. fe0024293-geglobal | netl.doe.gov

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

    Unconventional Resources Enhanced Oil Recovery Deepwater Tech Methane Hydrate nXis Well Integrity Inspection in Unconventional Wells Last Reviewed January 2015 DE-FE0024293...

  17. fe0013723-UTA | netl.doe.gov

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

    Development of Nanoparticle-Stabilized Foams To Improve Performance of Water-less Hydraulic Fracturing Last Reviewed 1292014 DE-FE0013723 Goal The overall objective of this...

  18. fe0024314-swri | netl.doe.gov

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

    Novel Natural Gas Surface Process Equipment for Replacement of Water as Primary Hydraulic Fracturing Fluid Last Reviewed 1272015 DE-FE0024314 Goal The goal is to develop...

  19. Structural and magnetic properties of the ordered FePt{sub 3}, FePt and Fe{sub 3}Pt nanoparticles

    SciTech Connect (OSTI)

    Liu, Yang [Institute of Condensed State Physics, Jilin Normal University, Siping 136000 (China); Key Laboratory of Functional Materials Physics and Chemistry (Jilin Normal University), Ministry of Education, Siping 136000 (China); Institute of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 (China); Jiang, Yuhong; Zhang, Xiaolong; Wang, Yaxin; Zhang, Yongjun; Liu, Huilian; Zhai, Hongju; Liu, Yanqing [Institute of Condensed State Physics, Jilin Normal University, Siping 136000 (China); Key Laboratory of Functional Materials Physics and Chemistry (Jilin Normal University), Ministry of Education, Siping 136000 (China); Yang, Jinghai, E-mail: jhyang1@jlnu.edu.cn [Institute of Condensed State Physics, Jilin Normal University, Siping 136000 (China); Key Laboratory of Functional Materials Physics and Chemistry (Jilin Normal University), Ministry of Education, Siping 136000 (China); Yan, Yongsheng, E-mail: yanyongsheng215@126.com [Institute of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 (China)

    2014-01-15T23:59:59.000Z

    The Fe{sub x}Pt{sub 100?x} nanoparticles (NPs) with different nominal atomic rations (30?x?80) were synthesized at 700 °C by the sol–gel method. The structure, morphology and magnetic properties of the samples were investigated. When the Fe content in the Fe–Pt alloy NPs was 30 at%, FePt{sub 3} NPs were successfully synthesized. With the increase in Fe content up to 50 at%, it was found that the superlattice reflections (0 0 1) and (1 1 0) appeared, which indicated the formation of the L1{sub 0}-FePt phase. Meanwhile, the FePt{sub 3} fraction was reduced. When the Fe content increased to 60 at%, single-phase L1{sub 0}-FePt NPs were synthesized. The coercivity (Hc), saturation magnetization (Ms) and chemical order parameter S for Fe{sub 60}Pt{sub 40} NPs were as high as 10,200 Oe, 17.567 emu/g and 0.928, respectively. With the further increase of the Fe content to 80 at%, only Fe{sub 3}Pt phase existed and the Hc of the Fe{sub 3}Pt NPs decreased drastically to 360 Oe. - Graphical abstract: Fe{sub 3}Pt, FePt and FePt{sub 3} nanoparticles was obtained by sol–gel method. The effect of iron and platinum content on structural and magnetic properties of the FePt nanoparticles was investigated. Display Omitted - Highlights: • L1{sub 2}-FePt{sub 3}, L1{sub 0}-FePt and L1{sub 2}-Fe{sub 3}Pt NPs were synthesized by sol–gel method. • The chemical order parameter S affects the magnetic properties of the Fe–Pt alloy. • Structural and magnetic properties of the Fe–Pt alloy NPs were studied. • The synthetic route in this study will open up the possibilities of practical use.

  20. Project RU LlSON COPY ON-SITE RADIOLOGICAL PROGRAMS DURING REENTRY DISILLING THROUGH PRODUCTION TESTING

    Office of Legacy Management (LM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA groupTuba City, Arizona, DisposalFourthN V O 1 8 7 +NewAugust Only criticalRU

  1. Low-temperature transport properties of the mixed-valence semiconductor Ru{sub 0.5}Pd{sub 0.5}Sb{sub 3}

    SciTech Connect (OSTI)

    Nolas, G.S. [Research and Development Division, Marlow Industries, Dallas, Texas 75238 (United States)] [Research and Development Division, Marlow Industries, Dallas, Texas 75238 (United States); Harris, V.G.; Tritt, T.M. [Materials Physics Branch, Naval Research Laboratory, Washington, DC 20375 (United States)] [Materials Physics Branch, Naval Research Laboratory, Washington, DC 20375 (United States); Slack, G.A. [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)] [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

    1996-12-01T23:59:59.000Z

    We have measured the transport properties of Ru{sub 0.5}Pd{sub 0.5}Sb{sub 3} from 300 down to 4 K and compared them to those of the binary-skutterudite antimonides. In particular, the lattice thermal conductivity of this compound is substantially lower than that of CoSb{sub 3} and IrSb{sub 3}. This is attributed to the mixed-valency of ruthenium in this compound. Using near-edge extended absorption fine structure analysis, it is observed that ruthenium in this compound is in the Ru{sup 4+}- and Ru{sup 2+}-valence states in approximately equal proportions. The potential for thermoelectric applications of this material is also discussed. {copyright} {ital 1996 American Institute of Physics.}

  2. Exotic magnetism on the quasi-FCC lattices of the d3 double perovskites La2NaB'O6 (B' = Ru, Os)

    SciTech Connect (OSTI)

    Aczel, Adam A [ORNL] [ORNL; Baker, Peter J. [ISIS Facility, Rutherford Appleton Laboratory (ISIS)] [ISIS Facility, Rutherford Appleton Laboratory (ISIS); Bugaris, Dan [University of South Carolina] [University of South Carolina; Yeon, Jeongho [University of South Carolina, Columbia] [University of South Carolina, Columbia; Zur Loye, Hans-Conrad [University of South Carolina] [University of South Carolina; Guidi, T. [ISIS Facility, Rutherford Appleton Laboratory (ISIS)] [ISIS Facility, Rutherford Appleton Laboratory (ISIS); Adroja, D. T. [ISIS Facility, Rutherford Appleton Laboratory (ISIS)] [ISIS Facility, Rutherford Appleton Laboratory (ISIS)

    2014-01-01T23:59:59.000Z

    We find evidence for long-range and short-range ($\\zeta$~$=$~70~\\AA~at 4~K) incommensurate magnetic order on the quasi-face-centered-cubic (FCC) lattices of the monoclinic double perovskites La$_2$NaRuO$_6$ and La$_2$NaOsO$_6$ respectively. Incommensurate magnetic order on the FCC lattice has not been predicted by mean field theory, but may arise via a delicate balance of inequivalent nearest neighbour and next nearest neighbour exchange interactions. In the Ru system with long-range order, inelastic neutron scattering also reveals a spin gap $\\Delta$~$\\sim$~2.75~meV. Magnetic anisotropy is generally minimized in the more familiar octahedrally-coordinated $3d^3$ systems, so the large gap observed for La$_2$NaRuO$_6$ may result from the significantly enhanced value of spin-orbit coupling in this $4d^3$ material.

  3. Fe(II)-catalyzed Recrystallization of Goethite Revisited. | EMSL

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

    structural Fe in Fe(III) oxides and aqueous Fe(II) with no formation of secondary minerals or change in particle size or shape. Here we derive a mass balance model to quantify...

  4. al cr fe: Topics by E-print Network

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

    junctions with CrFe and CrFeCr barriers. Although the exact... Robinson, J. W. A.; Banerjee, N.; Blamire, M. G. 2014-03-05 15 Cavitation erosion of laser processed Fe-Cr-Mn and...

  5. Theoretical Electron Density Distributions for Fe- and Cu-Sulfide...

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

    Electron Density Distributions for Fe- and Cu-Sulfide Earth Materials: A Connection between Bond Length, Bond Theoretical Electron Density Distributions for Fe- and Cu-Sulfide...

  6. Biogeochemical Transformation of Fe Minerals in a Petroleum-Contaminat...

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

    Transformation of Fe Minerals in a Petroleum-Contaminated Aquifer. Biogeochemical Transformation of Fe Minerals in a Petroleum-Contaminated Aquifer. Abstract: Biogeochemical...

  7. Purification and Characterization of [NiFe]-Hydrogenase of Shewanella...

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

    Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1. Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1....

  8. Interactions of hydrogen with alkali promoted Ru/SiO{sub 2} catalysts: A proton NMR study

    SciTech Connect (OSTI)

    Ozbay, U.D.

    1994-05-10T23:59:59.000Z

    Role of H spillover to the silica support was studied using chemisorption; a strongly bound component of spilled over H was found in the silica support which interfered with accurate measurements of active metal sites via volumetric strong H chemisorption. The volumetric chemisorption technique was modified so that measurement times were reduced from 12--36 h to 1 h. The active Ru surface was characterized means of changes in proton spin counts and NMR Knight shifts vs alkali loading. Na, K blocked the active surface of Ru metal, but Cs was pushed off by H chemisorption. The alkali promoters restricted H mobility on both metal surface and at the metal support interfaces; this is consistent with effects on Fischer-Tropsch synthesis. {sup 1}H NMR was used to study the effect of the active metal and promoter on support hydroxyl groups. The OH group density in the silica support decreased with metal and/or promoter loading, but not on a one-to-one basis; the exchange efficiency of the hydroxyls decreased with atomic size of the alkali metal. An additional downfield proton resonance was detected which was assigned to the alkali hydroxide species in the support.

  9. Study of Fe-Co Nanocomposite Films

    SciTech Connect (OSTI)

    Lancok, A.; Klementova, M. [Institute of Inorganic Chemistry of the AS CR, v. v. i., 250 68 Husinec-Rez 1001 (Czech Republic); Kohout, J. [Faculty of Mathematics and Physics. Charles University, V Holesovickach 2, 180 00 Prague (Czech Republic); Miglierini, M. [Institute of Inorganic Chemistry of the AS CR, v. v. i., 250 68 Husinec-Rez 1001 (Czech Republic); Department of Nuclear Physics and Technology, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava (Slovakia); Fendrych, F.; Lancok, J. [Institute of Physics AS CR, v. v. i., Na Slovance 2, 182 21 Prague (Czech Republic)

    2010-07-13T23:59:59.000Z

    Moessbauer study of nanogranular ferromagnetic FeCo films is presented. Two ways of production of nanocomposite systems were employed: (i) hollow cathode plasma jet deposition process, and (ii) laser ablation from Fe-Co metallic targets by means of a KrF excimer laser and r.f. magnetron sputtering. Complementary information on the composition of the samples were obtained by nuclear magnetic resonance of {sup 57}Fe and {sup 59}Co nuclei, conversion electron Moessbauer spectroscopy, and high resolution transmission electron microscopy. The films contain crystalline nanoparticles, 5-20 nm in size, embedded in an amorphous matrix.

  10. Excited State Dynamics of Two New Ru(II) Cyclometallated Dyes: Relation to Cells for Solar Energy Conversion and Comparison to

    E-Print Network [OSTI]

    Turro, Claudia

    Excited State Dynamics of Two New Ru(II) Cyclometallated Dyes: Relation to Cells for Solar Energy, are reported. Related complexes have been used as efficient dyes in dye- sensitized solar cells (DSSCs of ruthenium dyes used in DSSCs to lower energies, it is evident from this work, that for cyclometallated phpy

  11. Oxidation of Methanol on 2nd and 3rd Row Group VIII Transition Metals (Pt, Ir, Os, Pd, Rh, and Ru): Application to Direct Methanol

    E-Print Network [OSTI]

    Goddard III, William A.

    Oxidation of Methanol on 2nd and 3rd Row Group VIII Transition Metals (Pt, Ir, Os, Pd, Rh, and Ru): Application to Direct Methanol Fuel Cells Jeremy Kua and William A. Goddard III* Contribution from functional theory (B3LYP)], we calculated the 13 most likely intermediate species for methanol oxidation

  12. Electron Microscopy Study of Novel Ru Doped La0.8Sr0.2CrO3 as Anode Materials for Solid Oxide Fuel Cells (SOFCs)

    E-Print Network [OSTI]

    Marks, Laurence D.

    Electron Microscopy Study of Novel Ru Doped La0.8Sr0.2CrO3 as Anode Materials for Solid Oxide Fuel Fuel Cells (SOFCs) have been the center of research activities with the goal of improving energy Cells (SOFCs) Y. Wang,* B. D. Madsen,* W. Kobsiriphat,* S.A. Barnett* and L.D. Marks* * Department

  13. Ferromagnetic Mn moments at SrRuO3/SrMnO3 interfaces Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

    E-Print Network [OSTI]

    Haskel, Daniel

    Ferromagnetic Mn moments at SrRuO3/SrMnO3 interfaces Y. Choia Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 Y. Z. Yoo, O. Chmaissem, A. Ullah, S. Kolesnik, and C. W University, DeKalb, Illinois 60115 D. Haskel Advanced Photon Source, Argonne National Laboratory, Argonne

  14. Mid-Infrared Spectrum of [Ru(phen)3]2+* Kristin M. Omberg, Jon R. Schoonover,*, Stefan Bernhard, John A. Moss,

    E-Print Network [OSTI]

    Bernhard, Stefan

    (diphenylarsino)ethane) in acetonitrile-d3 at 298 K. The spectra are assigned by comparison to electrochemically generated [RuIII(phen)3 Materials. Acetonitrile-d3 was obtained from Cambridge Isotope Labs and used without further purification

  15. Address: 125252, Russia, Moscow, Zorge Street, 9, www.farmina.ru The status and development trends of the Russian HP market

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    1500 E, SBB 1500 cool, WTS 40, 5 water heaters water to the house. #12;5 Address: 125252, Russia, Moscow, Zorge Street, 9, www.farmina.ru The statusW ); - in the hotel complex, Ulyanovsk region (heating capacity - 350 kW ); - heating and hot water supply

  16. FE0005889_UTPermian | netl.doe.gov

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

    Case Studies of the ROZ CO2 Flood and the Combined ROZMPZ CO2 Flood at the Goldsmith Landreth Unit, Ector County, Texas Last Reviewed 12162014 DE-FE0005889 Goal The goal of this...

  17. Anisotropic hot deformed magnets prepared from Zn-coated MRE-Fe-B ribbon powder (MRE?=?Nd?+?Y?+?Dy)

    SciTech Connect (OSTI)

    Tang, W.; Zhou, L.; Sun, K. W.; Dennis, K. W.; Kramer, M. J.; Anderson, I. E.; McCallum, R. W.

    2014-05-07T23:59:59.000Z

    Milled melt-spun ribbon flake of MRE-Fe-B coated with Zn coating using a vapor transport technique was found to have significant increase in coercivity without degrading the magnetization when the Zn thickness and heat treatment were optimized. Magnetic measurements show that 0.5–1?wt.?% Zn coating increases the coercivity about 1?kOe over the initial ribbon powder. After vacuum hot deformation (VHD), the VHD magnet with Zn coating of 0.5?wt.?% results in a nearly 3?kOe higher coercivity than an un-coated alloy magnet. An optimized VHD magnet with 0.5?wt.?% Zn coating obtains a coercivity of 11.2?kOe and (BH)max of 23.0 MGOe, respectively. SEM and TEM microstructures analysis demonstrates that the Zn coating on the surface of ribbon powder has diffused along the intergranular boundaries after the ribbon powder was annealed at 750?°C for 30?min or was hot deformed at 700–750?°C.

  18. Thermodynamics of the Magnetite-Ulvöspinel (Fe3O4-Fe2TiO4) Solid...

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

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

  19. FINITENESS OF e Ass Fe (M) AND ITS

    E-Print Network [OSTI]

    Katzman, Moty

    FINITENESS OF e Ass Fe (M) AND ITS CONNECTIONS TO TIGHT CLOSURE. Mordechai Katzman Abstract. Let R the sets e Ass Fe(M) and e Ass Ge(M) where Fe() is the Peskine-Szpiro functor and Ge(M) is Fe(M) modulo and tight closure. The last section of this paper constructs an example which shows that e Ass Fe(M) may

  20. Second Harmonic Generation Studies of Fe(II) Interactions with Hematite (?-Fe2O3)

    SciTech Connect (OSTI)

    Jordan, David S.; Hull, Christopher J.; Troiano, Julianne M.; Riha, Shannon C.; Martinson, Alex B.; Rosso, Kevin M.; Geiger, Franz M.

    2013-02-28T23:59:59.000Z

    Iron oxides are a ubiquitous class of compounds that are involved in many biological, geological, and technological processes, and the Fe(III)/Fe(II) redox couple is a fundamental transformation pathway; however, the study of iron oxide surfaces in aqueous solution by powerful spectroscopic techniques has been limited due to "strong absorber problem". In this work, atomic layer deposition (ALD) thin films of polycrystalline alpha-Fe2O3 were analyzed using the Eisenthal chi((3)) technique, a variant of second harmonic generation that reports on interfacial potentials. By determining the surface charge densities at multiple pH values, the point of zero charge was found to be 5.5 +/- 0.3. The interaction of aqueous Fe(II) at pH 4 and in 1 mM NaCl with ALD-prepared hematite was found to be fully reversible and to lead to about 4 times more ferrous iron ions adsorbed per square centimeter than on fused-silica surfaces under the same conditions. The data are consistent with a recently proposed conceptual model for net Fe(II) uptake or release that is underlain by a dynamic equilibrium between Fe(II) adsorbed onto hematite, electron transfer into favorable surface sites with attendant Fe(III) deposition, and electron conduction to favorable remote sites that release and replenish aqueous Fe(II).

  1. FeMn/Fe/Co/Cu(1,1,10) films studied using the magneto-optic Kerr effect and photoemission electron microscopy

    E-Print Network [OSTI]

    Meng, Y.

    2012-01-01T23:59:59.000Z

    B 84, 064416 (2011) FeMn/Fe/Co/Cu(1,1,10) ?lms studied usingmeasurements on FeMn/ Fe(8ML)/Co/vicinal Cu(001), in whichthe FeMn(10ML)/Fe(2ML)/Co(20ML)/Cu(1,1,10) sample growth. (

  2. Observation of Transverse Bose-Einstein Condensation via Hanbury BrownTwiss Correlations Wu RuGway, A. G. Manning, S. S. Hodgman, R. G. Dall, and A. G. Truscott

    E-Print Network [OSTI]

    Kheruntsyan, Karen

    Observation of Transverse Bose-Einstein Condensation via Hanbury Brown­Twiss Correlations Wu Ru a three-dimensional thermal gas to a gas undergoing transverse condensation by probing Hanbury Brown­Twiss

  3. The transport coefficients in (R1.5Ce0.5)RuSr2Cu2O10-5 (R=Gd,Eu) rutheno-cuprates

    E-Print Network [OSTI]

    Anatska, Maryna Petrovna

    2007-04-25T23:59:59.000Z

    Page Table 1. The onset of superconductivity and the values for first and second superconducting temperatures, Tc and Tcg superconducting temperatures for Ru-1222(Eu) with different oxygen content..............................................61... Table 2. The onset of superconductivity, the values for first and second superconducting temperatures, Tc and Tcg determined from resistivity data and the superconducting temperatures TcS determined from thermopower data for Ru-1222(Gd) with different...

  4. Magnetic interaction in oxygenated alpha Fe-phthalocyanines

    SciTech Connect (OSTI)

    Kuzmann, Ern?, E-mail: kuzmann@caesar.elte.hu; Homonnay, Zoltán; Horváth, Attila [Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, 1512 Budapest (Hungary); Pechousek, Jiri; Cuda, Jan; Machala, Libor; Zoppellaro, Giorgio; Zboril, Radek [Regional Centre of Advanced Technologies and Materials, Departments of Experimental Physics and Physical Chemistry, Faculty of Science Palacky University, 17. Listopadu 1192/12, 771 46 Olomouc (Czech Republic); Yin, Houping; Wei, Yen [Department of Chemistry, Drexel University, Philadelphia, PA 19104 (United States); Klencsár, Zoltán [Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, 1117 (Hungary); Kubuki, Shiro [Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachi-Oji, Tokyo 192-0397 (Japan); Nath, Amar [Department of Chemistry, University of North Carolina, Asheville, NC 28804 (United States)

    2014-10-27T23:59:59.000Z

    Alpha iron phthalocyanines (?-FePc) oxygenated at low temperatures were investigated with the help of {sup 57}Fe Mössbauer spectroscopy, magnetization measurements (SQUID) and X-ray diffractometry (XRD). Mössbauer spectroscopy revealed that upon oxygenation of ?-FePc, new species were formed which could be associated with Fe{sup III}Pc oxygen adducts. Unexpectedly, magnetically split spectrum of oxygenated ?-FePc was observed below 20 K. In-field Mössbauer spectra in a 5 T external magnetic field at 5K and magnetization measurements indicate antiferromagnetic coupling in oxygenated ?-FePc.

  5. Membrane separation advances in FE hydrogen program

    SciTech Connect (OSTI)

    NONE

    2007-12-31T23:59:59.000Z

    Since its inception in Fiscal Year 2003 the US Office of Fossil Energy (FE) Hydrogen from Coal Program has sponsored more than 60 projects and made advances in the science of separating out pure hydrogen from syngas produced through coal gasification. The Program is focusing on advanced hydrogen separation technologies, which include membranes, and combining the WGS reaction and hydrogen separation in a single operation known as process intensification. The article explains the technologies and describes some key FE membrane projects. More details are available from http://www.fossil.energy.gov. 1 fig.

  6. Santa Fe Community College selects new president

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementingnpitcheResearch Briefs TheSanket A. Deshmukh ArgonneSanta FeSanta Fe

  7. Regulation of brain copper homeostasis by the brain barrier systems: Effects of Fe-overload and Fe-deficiency

    SciTech Connect (OSTI)

    Monnot, Andrew D.; Behl, Mamta; Ho, Sanna; Zheng, Wei, E-mail: wzheng@purdue.edu

    2011-11-15T23:59:59.000Z

    Maintaining brain Cu homeostasis is vital for normal brain function. The role of systemic Fe deficiency (FeD) or overload (FeO) due to metabolic diseases or environmental insults in Cu homeostasis in the cerebrospinal fluid (CSF) and brain tissues remains unknown. This study was designed to investigate how blood-brain barrier (BBB) and blood-SCF barrier (BCB) regulated Cu transport and how FeO or FeD altered brain Cu homeostasis. Rats received an Fe-enriched or Fe-depleted diet for 4 weeks. FeD and FeO treatment resulted in a significant increase (+ 55%) and decrease (- 56%) in CSF Cu levels (p < 0.05), respectively; however, neither treatment had any effect on CSF Fe levels. The FeD, but not FeO, led to significant increases in Cu levels in brain parenchyma and the choroid plexus. In situ brain perfusion studies demonstrated that the rate of Cu transport into the brain parenchyma was significantly faster in FeD rats (+ 92%) and significantly slower (- 53%) in FeO rats than in controls. In vitro two chamber Transwell transepithelial transport studies using primary choroidal epithelial cells revealed a predominant efflux of Cu from the CSF to blood compartment by the BCB. Further ventriculo-cisternal perfusion studies showed that Cu clearance by the choroid plexus in FeD animals was significantly greater than control (p < 0.05). Taken together, our results demonstrate that both the BBB and BCB contribute to maintain a stable Cu homeostasis in the brain and CSF. Cu appears to enter the brain primarily via the BBB and is subsequently removed from the CSF by the BCB. FeD has a more profound effect on brain Cu levels than FeO. FeD increases Cu transport at the brain barriers and prompts Cu overload in the CNS. The BCB plays a key role in removing the excess Cu from the CSF.

  8. 90° magnetic coupling in a NiFe/FeMn/biased NiFe multilayer spin valve component investigated by polarized neutron reflectometry

    SciTech Connect (OSTI)

    Callori, S. J., E-mail: sara.callori@ansto.gov.au; Bertinshaw, J. [School of Physics, The University of New South Wales, Sydney, New South Wales 2052 (Australia); Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, New South Wales 2234 (Australia); Cortie, D. L. [The Institute for Superconducting and Electronic Materials, The University of Wollongong, Wollongong, New South Wales 2522 (Australia); Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, New South Wales 2234 (Australia); Cai, J. W., E-mail: jwcai@aphy.iphy.ac.cn; Zhu, T. [Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Le Brun, A. P. [Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, New South Wales 2234 (Australia); Klose, F. [Bragg Institute, Australian Nuclear Science and Technology Organization, Lucas Heights, New South Wales 2234 (Australia); Department of Physics and Materials Science, City University of Hong Kong (Hong Kong)

    2014-07-21T23:59:59.000Z

    We have observed 90° magnetic coupling in a NiFe/FeMn/biased NiFe multilayer system using polarized neutron reflectometry. Magnetometry results show magnetic switching for both the biased and free NiFe layers, the latter of which reverses at low applied fields. As these measurements are only capable of providing information about the total magnetization within a sample, polarized neutron reflectometry was used to investigate the reversal behavior of the NiFe layers individually. Both the non-spin-flip and spin-flip neutron reflectometry signals were tracked around the free NiFe layer hysteresis loop and were used to detail the evolution of the magnetization during reversal. At low magnetic fields near the free NiFe coercive field, a large spin-flip signal was observed, indicating magnetization aligned perpendicular to both the applied field and pinned layer.

  9. Synthesis and microstructural TEM investigation of CaCu{sub 3}Ru{sub 4}O{sub 12} ceramic and thin film

    SciTech Connect (OSTI)

    Brize, Virginie [Universite Francois Rabelais, LEMA, UMR 6157 CNRS-CEA, Parc de Grandmont, 37200 Tours (France); STMicroelectronics, 16 rue P and M Curie, 37001 Tours (France); Autret-Lambert, Cecile, E-mail: cecile.autret-lambert@univ-tours.fr [Universite Francois Rabelais, LEMA, UMR 6157 CNRS-CEA, Parc de Grandmont, 37200 Tours (France); Wolfman, Jerome; Gervais, Monique; Gervais, Francois [Universite Francois Rabelais, LEMA, UMR 6157 CNRS-CEA, Parc de Grandmont, 37200 Tours (France)

    2011-10-15T23:59:59.000Z

    CaCu{sub 3}Ru{sub 4}O{sub 12} (CCRO) is a conductive oxide having the same structure as CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO) and close lattice parameters. The later compound is strongly considered for high density parallel plates capacitors application due to its so-called colossal dielectric constant. The need for an electrode inducing CCTO epitaxial growth with a clean and sharp interface is therefore necessary, and CCRO is a good potential candidate. In this paper, the synthesis of monophasic CCRO ceramic is reported, as well as pulsed laser deposition of CCRO thin film onto (001) NdCaAlO{sub 4} substrate. Structural and physical properties of bulk CCRO were studied by transmission electron microscopy and electron spin resonance. CCRO films and ceramic exhibited a metallic behavior down to low temperature. CCRO films were (001) oriented and promoted a CCTO film growth with the same orientation. - Graphical Abstract: Structure of CaCu{sub 3}Ru{sub 4}O{sub 12} showing the RuO{sub 6} octahedra and the square planar environment for Cu{sup 2+}. Highlights: > In this study, we investigate the structural properties and microstructure of ceramics CaCu{sub 3}Ru{sub 4}O{sub 12}. > We study the conduction properties of polycrystalline material. > Then we synthesize the conductive thin film which is deposited on a high K material with the same structure (CaCu{sub 3}Ti{sub 4}O{sub 12}).

  10. High-Quality Epitaxy of Ruthenium Dioxide, RuO2, on Rutile Titanium Dioxide, TiO2, by Pulsed Chemical Vapor Deposition

    E-Print Network [OSTI]

    of rutile TiO2, a material with a high dielectric constant. Therefore, capacitors with high capacitance per these capacitors have low leakage current. Due to its good redox properties, RuO2 has been made into electrodes films have been made by CVD, such as wide-gap semiconductors ZnO23,25 and SnO2,26,27 super- conducting

  11. Layer-dependent Debye temperature and thermal expansion of Ru(0001) by means of high-energy resolution core-level photoelectron spectroscopy

    SciTech Connect (OSTI)

    Ferrari, Eugenio; Galli, Lorenzo; Miniussi, Elisa; Morri, Maurizio; Panighel, Mirko; Ricci, Maria [Physics Department, University of Trieste, Via Valerio 2, I-34127 Trieste (Italy); Lacovig, Paolo; Lizzit, Silvano [Sincrotrone Trieste S.C.p.A., Strada Statale 14 Km 163.5, 34149 Trieste (Italy); Baraldi, Alessandro [Physics Department, University of Trieste, Via Valerio 2, I-34127 Trieste (Italy); Laboratorio TASC, IOM-CNR, S.S. 14 Km 163.5, I-34149 Trieste (Italy)

    2010-11-15T23:59:59.000Z

    The layer-dependent Debye temperature of Ru(0001) is determined by means of high-energy resolution core-level photoelectron spectroscopy measurements. The possibility to disentangle three different components in the Ru 3d{sub 5/2} spectrum of Ru(0001), originating from bulk, first-, and second-layer atoms, allowed us to follow the temperature evolution of their photoemission line shapes and binding energies. Temperature effects were detected, namely, a lattice thermal expansion and a layer-dependent phonon broadening, which was interpreted within the framework of the Hedin-Rosengren formalism based on the Debye theory. The resulting Debye temperature of the top-layer atoms is 295{+-}10 K, lower than that of the bulk (T=668{+-}5 K) and second-layer (T=445{+-}10 K) atoms. While these results are in agreement with the expected phonon softening at the surface, we show that a purely harmonic description of the motion of the surface atoms is not valid, since anharmonic effects contribute significantly to the position and line shape of the different core-level components.

  12. THE THICKNESS DISTORTION OF Fe 57 BACKSCATTER MOSSBAUER SPECTRA

    E-Print Network [OSTI]

    Fultz, B.

    2013-01-01T23:59:59.000Z

    F. Weise, and P. Flinn, "Mossbauer Spectrometry for AnalysisOF Fe 57 BACKSCATTER MOSSBAUER SPECTRA B. Fultz and J. W.DISTORTION OF Fe BACKSCATTER MOSSBAUER SPECTRA B. Fultz and

  13. Reductive Biotransformation of Fe in Shale-Limestone Saprolite...

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

    AQDS, whereas 24% and 35% of the Fe(III)TOT was bioreduced by CN32 after 40 and 95 d in media with AQDS. Little or no Fe2+, Mn, Si, Al, and Mg were evident in aqueous filtrates...

  14. Microbial Lithotrophic Oxidation of Structural Fe(II) in Biotite...

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

    of weathering. Here we show that a lithotrophic Fe(II)-oxidizing, nitrate-reducing enrichment culture (Straub, 6 1996) can grow via oxidation of structural Fe(II) in biotite, a...

  15. The effect of Ta on the magnetic thickness of permalloy (Ni{sub 81}Fe{sub 19}) films

    SciTech Connect (OSTI)

    Kowalewski, M. [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Butler, W. H. [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Moghadam, N. [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Stocks, G. M. [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Schulthess, T. C. [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Song, K. J. [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Thompson, J. R. [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)] [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Arrott, A. S. [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States)] [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States); Zhu, T. [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States)] [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States); Drewes, J. [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States)] (and others) [Honeywell, Inc., MN14-3C15, 12001 State Highway 55, Plymouth, Minnesota 55441 (United States)

    2000-05-01T23:59:59.000Z

    The effect of Ta and Ta/Cu seed layers, and Ta and Cu cap layers on the effective magnetic thickness of ultrathin permalloy (Ni{sub 81}Fe{sub 19}) was investigated for MRAM applications. The films were deposited by Ion Beam Deposition. The magnetic moment of each as-deposited permalloy film was measured using a B-H looper and a SQUID magnetometer. The films were further annealed at either 525 K for 1/2 h or 600 K for 1 h to study the effect of thermally driven interdiffusion on the magnetic moment of the permalloy film. Our theoretical calculations showed that the presence of 12% intermixing at the interface reduces the Ni moments to zero. Experimentally, it was shown that the tantalum rather than the copper interfaces are primarily responsible for the magnetically dead layers. The Ta seed layer interface produces a loss of moment equivalent to a magnetically dead layer of thickness 0.6{+-}0.2 nm. The Ta metal in the cap layer results in a loss of moment equivalent to a dead layer of thickness 1.0{+-}0.2 nm. Upon annealing, thermally driven interdiffusion is concluded to have a strong effect on the Ta(seed)/ Ni{sub 81}Fe{sub 19} as-deposited interface, based on the doubling of the magnetically dead layer to 1.2{+-}0.2 nm. The Ni{sub 81}Fe{sub 19}/Ta(cap) as-deposited interface slightly increases its equivalent magnetically dead layer upon annealing to 1.2{+-}0.2 nm. As-deposited interfaces of Ta(seed)/permalloy and permalloy/Ta(cap) are not chemically equivalent and result in different magnetically dead layers, whereas after annealing to 600 K both interfaces attain comparable intermixing and magnetically dead layers. It was also shown that a half-hour anneal at the lower 525 K annealing temperature, which is closer to the actual processing temperature, results in only slight increase of the magnetically dead layer at both interfaces. (c) 2000 American Institute of Physics.

  16. Metallicity distribution of bulge planetary nebulae and the [O/Fe] x [Fe/H] relation

    E-Print Network [OSTI]

    W. J. Maciel

    1999-10-27T23:59:59.000Z

    The O/H metallicity distribution of different samples of planetary nebulae in the bulge of the Milky Way and M31 are compared. O/H abundances are converted into [Fe/H] metallicity by the use of theoretical [O/Fe] x [Fe/H] relationships both for the bulge and the solar neighbourhood. It is found that these relationships imply an offset of [Fe/H] abundances by a factor up to 0.5 dex for bulge nebulae. Systematic errors in the O/H abundances as suggested by some recent recombination line work, ON cycling and statistical uncertainties are unable to explain the observed offset, suggesting that the adopted relationship for the bulge probably overestimates the oxygen enhancement relative to iron.

  17. Solution-phase photochemistry of a [FeFe]hydrogenase model compound: Evidence of photoinduced isomerisation

    SciTech Connect (OSTI)

    Kania, Rafal; Hunt, Neil T. [Department of Physics, University of Strathclyde, SUPA, Glasgow G4 0NG (United Kingdom); Frederix, Pim W. J. M. [Department of Physics, University of Strathclyde, SUPA, Glasgow G4 0NG (United Kingdom); WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL (United Kingdom); Wright, Joseph A.; Pickett, Christopher J. [Energy Materials Laboratory, School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ (United Kingdom); Ulijn, Rein V. [WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL (United Kingdom)

    2012-01-28T23:59:59.000Z

    The solution-phase photochemistry of the [FeFe] hydrogenase subsite model ({mu}-S(CH{sub 2}){sub 3}S)Fe{sub 2}(CO){sub 4}(PMe{sub 3}){sub 2} has been studied using ultrafast time-resolved infrared spectroscopy supported by density functional theory calculations. In three different solvents, n-heptane, methanol, and acetonitrile, relaxation of the tricarbonyl intermediate formed by UV photolysis of a carbonyl ligand leads to geminate recombination with a bias towards a thermodynamically less stable isomeric form, suggesting that facile interconversion of the ligand groups at the Fe center is possible in the unsaturated species. In a polar or hydrogen bonding solvent, this process competes with solvent substitution leading to the formation of stable solvent adduct species. The data provide further insight into the effect of incorporating non-carbonyl ligands on the dynamics and photochemistry of hydrogenase-derived biomimetic compounds.

  18. Magnetism in La?O?(Fe??xMnx)?Se? tuned by Fe/Mn ratio

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

    Lei, Hechang; Bozin, Emil S.; Llobet, A.; Ivanovski, V.; Koteski, V.; Belosevic-Cavor, J.; Cekic, B.; Petrovic, C.

    2012-09-01T23:59:59.000Z

    We report the evolution of structural and magnetic properties in La?O?(Fe??xMnx)?Se?. Heat capacity and bulk magnetization indicate an increased ferromagnetic component of the long-range magnetic order and possible increased degree of frustration. Atomic disorder on Fe(Mn) sites suppresses the temperature of the long-range order whereas intermediate alloys show a rich magnetic phase diagram.

  19. CRITICAL FLUCTUATIONS. ANOMALOUS LINE SHAPES OF Fe3+ -MOSSBAUER SPECTRA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    CRITICAL FLUCTUATIONS. ANOMALOUS LINE SHAPES OF Fe3+ -MOSSBAUER SPECTRA IN MAGNETICALLY ORDERED Mossbauer ont montre qu'un recuit incomplet des solutions solides CrzO3-Fez03 et A12 0 3-Fez03 donnelieu203-Fe203pures ou dopeespar Fe2+donnent lieu uneespkceentierementnouvelle de spectres Mossbauer

  20. Low 60Fe abundance in Semarkona and Sahara 99555

    E-Print Network [OSTI]

    Tang, Haolan

    2015-01-01T23:59:59.000Z

    Iron-60 (t1/2=2.62 Myr) is a short-lived nuclide that can help constrain the astrophysical context of solar system formation and date early solar system events. A high abundance of 60Fe (60Fe/56Fe= 4x10-7) was reported by in situ techniques in some chondrules from the LL3.00 Semarkona meteorite, which was taken as evidence that a supernova exploded in the vicinity of the birthplace of the Sun. However, our previous MC-ICPMS measurements of a wide range of meteoritic materials, including chondrules, showed that 60Fe was present in the early solar system at a much lower level (60Fe/56Fe=10-8). The reason for the discrepancy is unknown but only two Semarkona chondrules were measured by MC-ICPMS and these had Fe/Ni ratios below ~2x chondritic. Here, we show that the initial 60Fe/56Fe ratio in Semarkona chondrules with Fe/Ni ratios up to ~24x chondritic is 5.4x10-9. We also establish the initial 60Fe/56Fe ratio at the time of crystallization of the Sahara 99555 angrite, a chronological anchor, to be 1.97x10-9. The...

  1. Revised Transition Probabilities for Fe XXV Relativistic CI Calculations

    E-Print Network [OSTI]

    Johnson, Walter R.

    Revised Transition Probabilities for Fe XXV Relativistic CI Calculations W. R. Johnson1 and U are provided for transition probabilities between fine-structure components of levels with n 6 in FeXXV. Earlier published data for transitions between fine-structure levels in FeXXV is found to in error

  2. RDX degradation using an integrated Fe(0)-microbial treatment approach

    E-Print Network [OSTI]

    Alvarez, Pedro J.

    RDX degradation using an integrated Fe(0)-microbial treatment approach M.J. Wildman and P was enhanced by anaerobic bacteria that feed on cathodic hydrogen (i.e., H2 produced during anaerobic Fe(0) corrosion by water). Apparently, the hydrogenotrophic consortium that exploits Fe(0) corrosion

  3. Multiferroicity and spiral magnetism in FeVO{sub 4} with quenched Fe orbital moments

    SciTech Connect (OSTI)

    Daoud-Aladine, A.; Chapon, L. C. [ISIS facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom); Kundys, B.; Martin, C.; Simon, C. [Laboratoire CRISMAT-UMR, 6508 ENSI CAEN, 6, Marechal Juin, 14050 Caen (France); Radaelli, P. G. [ISIS facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom); Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom); Brown, P. J. [Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9 (France)

    2009-12-01T23:59:59.000Z

    FeVO{sub 4} has been studied by heat capacity, magnetic susceptibility, electric polarization and single-crystal neutron-diffraction experiments. The triclinic crystal structure is made of S-shaped clusters of six Fe{sup 3+} ions, linked by VO{sub 4}{sup 3-} groups. Two long-range magnetic ordering transitions occur at T{sub N1}=22 K and T{sub N2}=15 K. Both magnetic structures are incommensurate and below T{sub N2}, FeVO{sub 4} becomes weakly ferroelectric coincidentally with the loss of the collinearity of the magnetic structure in a very similar fashion than in the classical TbMnO{sub 3} multiferroic material. However we argue that the symmetry considerations and the mechanisms invoked to explain these properties in TbMnO{sub 3} do not straightforwardly apply to FeVO{sub 4}. First, the magnetic structures, even the collinear structure, are all acentric so that ferroelectricity in FeVO{sub 4} is not correlated with the fact magnetic ordering is breaking inversion symmetry. Regarding the mechanism, FeVO{sub 4} has quenched orbital moments that questions the exact role of the spin-orbit interactions.

  4. In vitro degradation and biocompatibility of FePd and FePt composites fabricated by spark plasma sintering

    E-Print Network [OSTI]

    Zheng, Yufeng

    rate than pure iron, Fe-5 wt.%Pd and Fe-5 wt.%Pt composites were prepared by spark plasma sinteringIn vitro degradation and biocompatibility of Fe­Pd and Fe­Pt composites fabricated by spark plasma sintering T. Huang a,b , J. Cheng c , Y.F. Zheng a,b,c, a State Key Laboratory for Turbulence and Complex

  5. In-field {sup 57}Fe Mössbauer spectroscopy below spin-flop transition in powdered troilite (FeS) mineral

    SciTech Connect (OSTI)

    Cuda, Jan, E-mail: jan.cuda@upol.cz; Tucek, Jiri; Filip, Jan; Malina, Ondrej; Krizek, Michal; Zboril, Radek [Regional Centre of Advanced Technologies and Materials, Departments of Experimental Physics and Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 1192/12, 771 46 Olomouc (Czech Republic); Kohout, Tomas [Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki University, Finland and Institute of Geology, Academy of Sciences of the Czech Republic v.v.i., Rozvojová 269, 165 00 Prague (Czech Republic)

    2014-10-27T23:59:59.000Z

    Powdered troilite (FeS), extracted from the Cape York IIIA octahedrite meteorite, was investigated employing in-field {sup 57}Fe Mössbauer spectroscopy. The study identified a typical behavior of polycrystalline antiferromagnetic material under external magnetic fields. The in-field evolution of the {sup 57}Fe Mössbauer spectra showed that the spin-flop transition in the FeS system occurs at a field higher than 5 T.

  6. Heavy d-electron Quasiparticle Interference and Real-space Electronic Structure of Sr3Ru2O7

    SciTech Connect (OSTI)

    Lee, J.; Allan, M.P.; Wang, M.A.; Farrell, J.; Grigera, S.A.; Baumberger, F.; Davis, J.C.; Mackenzie, A.P.

    2009-09-13T23:59:59.000Z

    The intriguing idea that strongly interacting electrons can generate spatially inhomogeneous electronic liquid-crystalline phases is over a decade old, but these systems still represent an unexplored frontier of condensed-matter physics. One reason is that visualization of the many-body quantum states generated by the strong interactions, and of the resulting electronic phases, has not been achieved. Soft condensed-matter physics was transformed by microscopies that enabled imaging of real-space structures and patterns. A candidate technique for obtaining equivalent data in the purely electronic systems is spectroscopic imaging scanning tunnelling microscopy (SI-STM). The core challenge is to detect the tenuous but 'heavy' momentum (k)-space components of the many-body electronic state simultaneously with its real-space constituents. Sr{sub 3}Ru{sub 2}O{sub 7} provides a particularly exciting opportunity to address these issues. It possesses a very strongly renormalized 'heavy' d-electron Fermi liquid and exhibits a field-induced transition to an electronic liquid-crystalline phase. Finally, as a layered compound, it can be cleaved to present an excellent surface for SI-STM.

  7. Controlled oxidation of FeCo magnetic nanoparticles to produce faceted FeCo/ferrite nanocomposites for rf heating applications

    E-Print Network [OSTI]

    Laughlin, David E.

    Controlled oxidation of FeCo magnetic nanoparticles to produce faceted FeCo/ferrite nanocomposites XRD and TEM showed MNPs to have a thin ferrite shell. Nanopowders were isochronally annealed and oxidation products in FeCo/ferrite nanocomposite materials and their influence on applications.4 We report

  8. Granular nanostructures and magnetic characteristics of FePt-TiO{sub 2}/FePt-C stacked granular films

    SciTech Connect (OSTI)

    Ono, Takuya, E-mail: ono-takuya@fujielectric.co.jp; Moriya, Tomohiro [Fuji Electric Co. Ltd., Tokyo 191-8502 (Japan); Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Miyagi 980-8578 (Japan); Hatayama, Masatoshi [Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Miyagi 980-8578 (Japan); Kikuchi, Nobuaki; Okamoto, Satoshi; Kitakami, Osamu [Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Miyagi 980-8577 (Japan); Shimatsu, Takehito [Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Miyagi 980-8578 (Japan); Research institutes of Electrical Communication (RIEC), Tohoku University, Miyagi 980-8577 (Japan)

    2014-05-07T23:59:59.000Z

    To realize a granular film composed of L1{sub 0}-FePt grains with high uniaxial magnetic anisotropy energy, K{sub u}, and segregants for heat-assisted magnetic recording, the FePt-TiO{sub 2}/FePt-C stacked film was investigated. The FePt-TiO{sub 2}/FePt-C stacked film has well-isolated granular structure with average grain size of 6.7?nm because the FePt-TiO{sub 2} film follows the FePt-C template film in microstructural growth. However, the K{sub u} value is quite low for total thickness of 9?nm: 5?×?10{sup 6} erg/cm{sup 3}. Exploration of the thickness dependence of L1{sub 0}-FePt(001) peaks in XRD spectra and cross-sectional TEM images suggest that degradation of the L1{sub 0} ordering appears near the middle of the FePt-TiO{sub 2} layer. The EDX-STEM mapping reveals that Ti atoms exist within the FePt grains in addition to the grain boundary. This indicates the possibility that TiO{sub 2} tends to be incorporated into the FePt grains and that it prevents L1{sub 0}-ordering of the FePt grains along the normal-to-plane direction.

  9. Challenges in synthesizing carbon-coated LiFePO4 nanoparticles from hydrous FePO4 and their electrochemical properties

    E-Print Network [OSTI]

    Park, Byungwoo

    Challenges in synthesizing carbon-coated LiFePO4 nanoparticles from hydrous FePO4 properties A B S T R A C T Carbon-coated LiFePO4 nanoparticles are obtained from a polymer-coated hydrous Fe polymer additives which are subsequently carbonized by calcination [14­19]. Carbon-coated LiFePO4

  10. FT-ICR SWNTs Co/Fe FT-ICR Mass Spectroscopy and Initial Reaction of Co/Fe Mixed Clusters

    E-Print Network [OSTI]

    Maruyama, Shigeo

    FT-ICR SWNTs Co/Fe FT-ICR Mass Spectroscopy and Initial Reaction of Co/Fe Mixed Clusters Used, for FenCoN-n + (N ) 2 (b) (Fe : Co = 0.514 : 0.486) 3 Fe2FeCoCo2 Corbett(3) Li Na 112 116 120 Mass (amu

  11. Nitrogen addition to bcc-Fe by attrition milling

    SciTech Connect (OSTI)

    Rawers, J.; Krabbe, R.; Cook, D.

    1999-01-01T23:59:59.000Z

    To enhance the nitrogen solubility in bcc-Fe, iron powder and blends of iron and iron nitride powders were attrition-milled in nitrogen gas. X-ray diffraction and Moessbauer spectroscopy were used to characterize the milled microstructure and to characterize the nitrogen distribution. After processing for 150 hours, the infused nitrogen was determined to be interstitial (locally deforming the bcc-Fe lattice to a bct-Fe lattice) and associated with the outer layer of the bcc-Fe nanograin. Nitrogen stabilized the milled grain structure but at elevated temperatures rapidly came to thermodynamical equilibrium, transforming from bcc-Fe(N) to bcc-Fe and Fe{sub 4}N.

  12. Speciation of Fe in ambient aerosol and cloudwater

    SciTech Connect (OSTI)

    Siefert, L. [California Institute of Technology, Pasadena, CA (United States)

    1996-08-15T23:59:59.000Z

    Atmospheric iron (Fe) is thought to play an important role in cloudwater chemistry (e.g., S(IV) oxidation, oxidant production, etc.), and is also an important source of Fe to certain regions of the worlds oceans where Fe is believed to be a rate-limiting nutrient for primary productivity. This thesis focuses on understanding the chemistry, speciation and abundance of Fe in cloudwater and aerosol in the troposphere, through observations of Fe speciation in the cloudwater and aerosol samples collected over the continental United States and the Arabian Sea. Different chemical species of atmospheric Fe were measured in aerosol and cloudwater samples to help assess the role of Fe in cloudwater chemistry.

  13. Effect of nitrogen upon structural and magnetic properties of FePt in FePt/AlN multilayer structures

    SciTech Connect (OSTI)

    Gao, Tenghua, E-mail: gao.t.ab@m.titech.ac.jp; Zhang, Cong; Sannomiya, Takumi; Muraishi, Shinji; Nakamura, Yoshio; Shi, Ji [Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8552 (Japan)

    2014-09-01T23:59:59.000Z

    This paper investigates the effect of the addition of nitrogen in FePt layers for ultrathin FePt/AlN multilayer structures. X-ray diffraction results reveal that a compressive stress relaxation occurs after annealing owing to the release of interstitial nitrogen atoms in the FePt layers. The introduction of nitrogen also induces a large in-plane compressive strain during grain growth not seen in FePt deposited without nitrogen. This strain is considered to decrease the driving force for (111) grain growth and FePt ordering.

  14. Proteome of Geobacter sulfurreducens grown with Fe(III) oxide or Fe(III) citrate as the electron acceptor.

    SciTech Connect (OSTI)

    Ding, Y-H R.; Hixson, Kim K.; Aklujkar, Ma; Lipton, Mary S.; Smith, Richard D.; Lovley, Derek R.; Mester, Tunde

    2008-12-01T23:59:59.000Z

    e(III) oxides are the most abundant source of reducible Fe(III) by microorganisms in most soils and sediments, yet few studies on the physiology of Fe(III)-reducing microorganisms during growth on Fe(III) oxide have been conducted because of the technical difficulties in working with cell growth and harvest in the presence of Fe(III) oxides. Geobacter sulfurreducens is a representative of the Geobacter species that predominate in a variety of subsurface environments in which Fe(III) oxide is important. In order to better understand the physiology of Geobacter species during growth on Fe(III) oxide, the proteome of G. sulfurreducens grown on Fe(III) oxide was compared with the proteome of cells grown with soluble Fe(III) citrate. Two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) revealed 19 proteins that were more abundant during growth on Fe(III) oxide than on soluble Fe(III). These included proteins related to protein synthesis, electron transfer and energy production, oxidative stress, protein folding, outer membrane proteins, nitrogen metabolism and hypothetical proteins. Further analysis of the proteome with the accurate mass and time (AMT) tag method revealed additional proteins associated with growth on Fe(III) oxide. These included the outer-membrane c-type cytochrome, OmcS and OmcG, which genetic studies have suggested are required for Fe(III) oxide reduction. Furthermore, several other cytochromes, as yet unstudied, were detected to be significantly up regulated during growth on Fe(III) oxide and other proteins of unknown function were more abundant during growth on Fe(III) oxide than on soluble Fe(III). PilA, the structural protein for pili, which is required for Fe(III) oxide reduction, and other pilin-associated proteins were also more abundant during growth on Fe(III) oxide. Confirmation of the differential expression of proteins known to be important in Fe(III) oxide reduction was observed, and an additional number of previously unidentified proteins were found with significant abundance in the cells grown under conditions of Fe(III) oxide reduction.

  15. Activation of the S-H Group in Fe(µ2-SH)Fe Clusters: S-H Bond Strengths and Free Radical Reactivity of the Fe(µ2-SH)Fe Cluster

    SciTech Connect (OSTI)

    Franz, James A.; Lee, Suh-Jane; Bowden, Thomas A.; Alnajjar, Mikhail S.; Appel, Aaron M.; Birnbaum, Jerome C.; Bitterwolf, Thomas E.; Dupuis, Michel

    2009-10-28T23:59:59.000Z

    Absolute rate constants were determined for the abstraction of hydrogen atom from (OC)3Fe(?-SH)2Fe(CO)3 (Fe2S2H2) and (OC)3Fe(?-SCH3)(?-SH)Fe(CO)3 (Fe2S2MeH) by benzyl radical in benzene. From the temperature dependent rate data for Fe2S2H2, ?H‡ and ?S‡ were determined to be 2.03 ? 0.56 kcal/mol and 19.3 ? 1.7 cal/mol K, respectively, giving kabs = 1.2 ? 107 M 1 s 1 at 25?C. For Fe2S2MeH, ?H‡ and ?S‡ were determined to be 1.97 ? 0.46 kcal/mol and 18.1 ? 1.5 cal/mol K, respectively, giving kabs = 2.3 ? 107 M 1 s 1 at 25?C. Temperature dependent rate data are also reported for hydrogen atom abstraction by benzyl radical from thiophenol (?H‡ = 3.62 ? 0.43 kcal/mol, ?S‡ = 21.7 ? 1.3 cal/mol K) and H2S (?H‡ = 5.13 ? 0.99 kcal/mol, ?S‡ = 24.8 ? 3.2 cal/mol K), giving kabs at 25?C of 2.5 ? 105 and 4.2 ? 103 M 1 s 1, respectively. DFT calculations predict S-H bond strengths of 73.1 and 73.2 kcal/mol for Fe2S2H2 and Fe2S2MeH, respectively. Free energy and NMR chemical shift calculations confirm the NMR assignments and populations of Fe2S2H2 and Fe2S2MeH isomers. Derived radicals Fe2S2H• and Fe2S2Me• exhibit singly occupied HOMOs with unpaired spin density distributed between the two Fe atoms, a bridging sulfur, and d?-bonding between Fe centers. The S-H solution bond dissociation free energy (SBDFE) of Fe2S2MeH was found to be 69.4 ± 1.7 kcal/mol by determination of its pKa (16.0 ± 0.4) and the potential for the oxidation of the anion, Fe2S2Me- of 0.26 ± 0.05 V vs. ferrocene in acetonitrile (corrected for dimerization of Fe2S2Me•). This SBDFE for Fe2S2MeH corresponds to a gas phase bond dissociation enthalpy (BDE) of 74.2 kcal/mol, in satisfactory agreement with the DFT value of 73.2 kcal/mol. Replacement of the Fe-Fe bond in Fe2S2MeH with bridging ?-S (Fe2S3MeH) or ?-CO (Fe2S2(CO)MeH) groups leads to (DFT) BDEs of 72.8 and 66.2 kcal/mol, the latter indicating dramatic effects of choice of bridge structure on S-H bond strengths. These results provide a model for the reactivity of hydrosulfido sites of low-valent heterogeneous FeS catalysts. This work was supported by the US Department of Energy's Office of Basic Energy Sciences, Chemical Sciences program. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.

  16. MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO4/FePO4 System

    E-Print Network [OSTI]

    Cabana, Jordi

    2010-01-01T23:59:59.000Z

    compared to the lithium-electron interaction in x Li FeP04 (by Fermi contact interactions between the lithium ions andlithium ions in LiFePC^ suggests a modification of the Fe -O-P interaction.

  17. “Covalent Hydration” Reactions in Model Monomeric Ru 2,2'-Bipyridine Complexes: Thermodynamic Favorability as a Function of Metal Oxidation and Overall Spin States

    SciTech Connect (OSTI)

    Ozkanlar, Abdullah; Cape, Jonathan L.; Hurst, James K.; Clark, Aurora E.

    2011-09-05T23:59:59.000Z

    Density functional theory (DFT) has been used to investigate the plausibility of water addition to the simple mononuclear ruthenium complexes, [(NH{sub 3}){sub 3}(bpy)Ru=O]{sup 2+}/{sup 3+} and [(NH{sub 3}){sub 3}(bpy)RuOH]{sup 3+}, in which the OH fragment adds to the 2,2{prime}-bipyridine (bpy) ligand. Activation of bpy toward water addition has frequently been postulated within the literature, although there exists little definitive experimental evidence for this type of 'covalent hydration'. In this study, we examine the energetic dependence of the reaction upon metal oxidation state, overall spin state of the complex, as well as selectivity for various positions on the bipyridine ring. The thermodynamic favorability is found to be highly dependent upon all three parameters, with free energies of reaction that span favorable and unfavorable regimes. Aqueous addition to [(NH{sub 3}){sub 3}(bpy)Ru=O]{sup 3+} was found to be highly favorable for the S = 1/2 state, while reduction of the formal oxidation state on the metal center makes the reaction highly unfavorable. Examination of both facial and meridional isomers reveals that when bipyridine occupies the position trans to the ruthenyl oxo atom, reactivity toward OH addition decreases and the site preferences are altered. The electronic structure and spectroscopic signatures (EPR parameters and simulated spectra) have been determined to aid in recognition of 'covalent hydration' in experimental systems. EPR parameters are found to uniquely characterize the position of the OH addition to the bpy as well as the overall spin state of the system.

  18. Ternary rare-earth ruthenium and iridium germanides RE{sub 3}M{sub 2}Ge{sub 3} (RE=Y, Gd–Tm, Lu; M=Ru, Ir)

    SciTech Connect (OSTI)

    Oliynyk, Anton O.; Stoyko, Stanislav S.; Mar, Arthur, E-mail: arthur.mar@ualberta.ca

    2013-06-15T23:59:59.000Z

    Through arc-melting reactions of the elements and annealing at 800 °C, the ternary rare-earth germanides RE{sub 3}Ru{sub 2}Ge{sub 3} and RE{sub 3}Ir{sub 2}Ge{sub 3} have been prepared for most of the smaller RE components (RE=Y, Gd–Tm, Lu). In the iridium-containing reactions, the new phases RE{sub 2}IrGe{sub 2} were also generally formed as by-products. Powder X-ray diffraction revealed orthorhombic Hf{sub 3}Ni{sub 2}Si{sub 3}-type structures (space group Cmcm, Z=4) for RE{sub 3}M{sub 2}Ge{sub 3} (M=Ru, Ir) and monoclinic Sc{sub 2}CoSi{sub 2}-type structures (space group C2/m, Z=4) for RE{sub 2}IrGe{sub 2}. Full crystal structures were determined by single-crystal X-ray diffraction for all members of RE{sub 3}Ru{sub 2}Ge{sub 3} (a=4.2477(6) Å, b=10.7672(16) Å, c=13.894(2) Å for RE=Y; a=4.2610(3)–4.2045(8) Å, b=10.9103(8)–10.561(2) Å, c=14.0263(10)–13.639(3) Å in the progression of RE from Gd to Lu) and for Tb{sub 3}Ir{sub 2}Ge{sub 3} (a=4.2937(3) Å, b=10.4868(7) Å, c=14.2373(10) Å). Both structures can be described in terms of CrB- and ThCr{sub 2}Si{sub 2}-type slabs built from Ge-centred trigonal prisms. However, band structure calculations on Y{sub 3}Ru{sub 2}Ge{sub 3} support an alternative description for RE{sub 3}M{sub 2}Ge{sub 3} based on [M{sub 2}Ge{sub 3}] layers built from linked MGe{sub 4} tetrahedra, which emphasizes the strong M–Ge covalent bonds present. The temperature dependence of the electrical resistivity of RE{sub 3}Ru{sub 2}Ge{sub 3} generally indicates metallic behaviour but with low-temperature transitions visible for some members (RE=Gd, Tb, Dy) that are probably associated with magnetic ordering of the RE atoms. Anomalously, Y{sub 3}Ru{sub 2}Ge{sub 3} exhibits semiconductor-like behaviour of uncertain origin. Magnetic measurements on Dy{sub 3}Ru{sub 2}Ge{sub 3} reveal antiferromagnetic ordering at 3 K and several unusual field-dependent transitions suggestive of complex spin reorientation processes. - Graphical abstract: RE{sub 3}M{sub 2}Ge{sub 3} (M=Ru, Ir) adopts the Hf{sub 3}Ni{sub 2}Si{sub 3}-type structure containing slabs built up from Ge-centred trigonal prisms. - Highlights: • Crystal structures of RE{sub 3}Ru{sub 2}Ge{sub 3} (RE=Y, Gd–Tm, Lu) and Tb{sub 3}Ir{sub 2}Ge{sub 3} were determined. • Strong M–Ge covalent bonds were confirmed by band structure calculations. • Most RE{sub 3}Ru{sub 2}Ge{sub 3} members except Y{sub 3}Ru{sub 2}Ge{sub 3} exhibit metallic behaviour. • Dy{sub 3}Ru{sub 2}Ge{sub 3} displays unusual field-dependent magnetic transitions.

  19. Overview of the development of FeAl intermetallic alloys

    SciTech Connect (OSTI)

    Maziasz, P.J.; Liu, C.T.; Goodwin, G.M.

    1995-09-01T23:59:59.000Z

    B2-phase FeAl ordered intermetallic alloys based on an Fe-36 at.% Al composition are being developed to optimize a combination of properties that includes high-temperature strength, room-temperature ductility, and weldability. Microalloying with boron and proper processing are very important for FeAl properties optimization. These alloys also have the good to outstanding resistance to oxidation, sulfidation, and corrosion in molten salts or chlorides at elevated temperatures, characteristic of FeAl with 30--40 at.% Al. Ingot- and powder-metallurgy (IM and PM, respectively) processing both produce good properties, including strength above 400 MPa up to about 750 C. Technology development to produce FeAl components for industry testing is in progress. In parallel, weld-overlay cladding and powder coating technologies are also being developed to take immediate advantage of the high-temperature corrosion/oxidation and erosion/wear resistance of FeAl.

  20. Microsoft Word - FeVI.doc

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA / USACE SWPAURTeC:8CO6 Figure 1. Proposed Fe(VI)-nitrido

  1. FE Categorical Exclusions | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic Plan| Department of Energy 088:EnergyFAR27.pdf FAR27.pdfEnclosureFE

  2. FE Petroleum Reserves News | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic Plan| Department of Energy 088:EnergyFAR27.pdfFE DOCKET NO.Oil

  3. FE Clean Energy Group | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model,DOEHazelPennsylvania: EnergyExolis Energy JumpFAC 04-08 Jump to:FC3 Group JumpFE

  4. FE Oil and Natural Gas News

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube|6721 FederalTexasManager FAQS Reference Guide -September 30,Clean CoalFE

  5. Isolation and microbial reduction of Fe(III) phyllosilicates...

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

    to conditions similar to that in the pristine sediment. The extent of microbial (Geobacter sulfurreducens) reduction of Fe(III) phyllosilicates isolated by CDB extraction (ca....

  6. Hydrocarbon Inhibition and HC Storage Modeling in Fe-Zeolite...

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

    aging, etc. deer09devarakonda.pdf More Documents & Publications The Effects of Hydrocarbons on NOx Reduction over Fe-based SCR Catalyst CLEERS Aftertreatment Modeling and...

  7. Competing retention pathways of uranium upon reaction with Fe...

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

    upon reaction with Fe(II). Abstract: Biogeochemical retention processes, including adsorption, reductive precipitation, and incorporation into host minerals, are important in...

  8. Anisotropic scattering rate in Fe-substituted Bi 2 Sr 2 Ca ( Cu 1 - x Fe x ) 2 O 8 + ?

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

    Naamneh, M.; Lubashevsky, Y.; Lahoud, E.; Gu, G. D.; Kanigel, A.

    2015-05-01T23:59:59.000Z

    We measured the electronic structure of Fe-substituted Bi2212 using angle-resolved photoemission spectroscopy. We find that the substitution does not change the momentum dependence of the superconducting gap but induces a very anisotropic enhancement of the scattering rate. A comparison of the effect of Fe substitution to that of Zn substitution suggests that the Fe reduces Tc so effectively because it suppresses very strongly the coherence weight around the antinodes.

  9. Modified embedded-atom method interatomic potential for the Fe-Cu alloy system and cascade simulations on pure Fe and Fe-Cu alloys

    SciTech Connect (OSTI)

    Lee, Byeong-Joo [Department of Materials Science and Engineering, Pohang University of Science and Technology Pohang 790-784 (Korea, Republic of); Wirth, Brian D. [Nuclear Engineering Department, University of California, Berkeley, Berkeley, California 94720-1730 (United States); Shim, Jae-Hyeok [Nuclear Engineering Department, University of California, Berkeley, Berkeley, California 94720-1730 (United States); Nano-Materials Research Center, Korea Institute of Science and Technology Seoul 136-791 (Korea, Republic of); Kwon, Junhyun; Kwon, Sang Chul; Hong, Jun-Hwa [Nuclear Materials Technology R and D Team, Korea Atomic Energy Research Institute, Taejon 305-353 (Korea, Republic of)

    2005-05-01T23:59:59.000Z

    A modified embedded-atom method (MEAM) interatomic potential for the Fe-Cu binary system has been developed using previously developed MEAM potentials of Fe and Cu. The Fe-Cu potential was determined by fitting to data on the mixing enthalpy and the composition dependencies of the lattice parameters in terminal solid solutions. The potential gives a value of 0.65 eV for the dilute heat of solution and reproduces the increase of lattice parameter of Fe with addition of Cu in good agreement with experiments. The potential was used to investigate the primary irradiation defect formation in pure Fe and Fe-0.5 at. % Cu alloy by a molecular dynamics cascade simulation study with a PKA energy of 2 keV at 573 K. A tendency for self-interstitial atom-Cu binding, the formation of mixed (Fe-Cu) dumbbells and even Cu-Cu dumbbells was observed. Given a positive binding energy between Cu atoms and self-interstitials, Cu transport by an interstitial diffusion mechanism could be proposed to contribute to the formation of Cu-rich precipitates and irradiation-induced embrittlement in nuclear structural steels.

  10. Microsoft Word - Multiscale_Speciation bh

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

    Los Alamos, McGuire AFB, Mayak, and Rocky Flats The chemical speciation of potentially hazardous subsurface contaminants is a crucial parameter in environmental risk assessment...

  11. Microsoft Word - MappingMetals bh

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

    Fluid catalytic cracking (FCC) is the refining process for converting large andor heavy molecules of oil feedstock into smaller and lighter hydrocarbons, such as gasoline....

  12. Microsoft Word - SupramolecularProtAssy bh

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

    (PDB 3IQ6). 1 One of the Zn binding motifs ensured the stable self-assembly of the tetramer, whereas the other motif anchored coordinatively unsaturated Zn sites for catalysis....

  13. Microsoft Word - InterfacialElectron bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Project0 FOIAneutron rich1 - 2,104 CX3Band

  14. Microsoft Word - MappingMetals bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Project0 FOIAneutron rich14.18theMapping

  15. Microsoft Word - Multiscale_Speciation bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Project0 FOIAneutronMeeting MayTERENA3

  16. Microsoft Word - SupramolecularProtAssy bh

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1 SECTION A. Revised: April 3, 2014 1 of2P.O.Figure 1.

  17. Structural characterisation of BaTiO{sub 3} thin films deposited on SrRuO{sub 3}/YSZ buffered silicon substrates and silicon microcantilevers

    SciTech Connect (OSTI)

    Colder, H.; Jorel, C., E-mail: corentin.jorel@unicaen.fr; Méchin, L. [GREYC, UMR 6072, CNRS, ENSICAEN, UCBN, 6 bd du Maréchal Juin, 14050 Caen Cedex (France); Domengès, B. [LAMIPS, CRISMAT-NXP Semiconductors-Presto Engineering laboratory, CNRS-UMR 6508, ENSICAEN, UCBN, 2 rue de la Girafe, 14 000 Caen (France); Marie, P.; Boisserie, M. [CIMAP, UMR 6252, CNRS, ENSICAEN, UCBN, CEA, 6 bd du Maréchal Juin, 14050 Caen Cedex (France); Guillon, S.; Nicu, L. [LAAS, CNRS, Univ de Toulouse, 7 avenue du Colonel Roche, 31400 Toulouse (France); Galdi, A. [GREYC, UMR 6072, CNRS, ENSICAEN, UCBN, 6 bd du Maréchal Juin, 14050 Caen Cedex (France); Department of Industrial Engineering, CNR-SPIN Salerno, Università di Salerno, 84084 Fisciano, Salerno (Italy)

    2014-02-07T23:59:59.000Z

    We report on the progress towards an all epitaxial oxide layer technology on silicon substrates for epitaxial piezoelectric microelectromechanical systems. (101)-oriented epitaxial tetragonal BaTiO{sub 3} (BTO) thin films were deposited at two different oxygen pressures, 5.10{sup ?2} mbar and 5.10{sup ?3} mbar, on SrRuO{sub 3}/Yttria-stabilized zirconia (YSZ) buffered silicon substrates by pulsed laser deposition. The YSZ layer full (001) orientation allowed the further growth of a fully (110)-oriented conductive SrRuO{sub 3} electrode as shown by X-ray diffraction. The tetragonal structure of the BTO films, which is a prerequisite for the piezoelectric effect, was identified by Raman spectroscopy. In the BTO film deposited at 5.10{sup ?2} mbar strain was mostly localized inside the BTO grains whereas at 5.10{sup ?3} mbar, it was localized at the grain boundaries. The BTO/SRO/YSZ layers were finally deposited on Si microcantilevers at an O{sub 2} pressure of 5.10{sup ?3} mbar. The strain level was low enough to evaluate the BTO Young modulus. Transmission electron microscopy (TEM) was used to investigate the epitaxial quality of the layers and their epitaxial relationship on plain silicon wafers as well as on released microcantilevers, thanks to Focused-Ion-Beam TEM lamella preparation.

  18. New Results for Double-Beta Decay of Mo-100 to Excited Final States of Ru-100 Using the TUNL-ITEP Apparatus

    E-Print Network [OSTI]

    M. F. Kidd; J. H. Esterline; W. Tornow; A. S. Barabash; V. I. Umatov

    2009-02-25T23:59:59.000Z

    The coincidence detection efficiency of the TUNL--ITEP apparatus designed for measuring half-life times of two-neutrino double-beta decay transitions to excited final states in daughter nuclei has been measured with a factor of 2.4 improved accuracy. In addition, the previous measuring time of 455 days for the study of the Mo-100 two-neutrino double-beta decay to the first excited 0+ state in Ru-100 has been increased by 450 days, and a new result (combined with the previous measurement obtained with the same apparatus) for this transition is presented: T_(1/2) = [5.5 (+1.2/-0.8) (stat) +/- 0.3 (syst)] x 10^20 y. Measured two-neutrino double-beta decay half-life times to excited states can be used to test the reliability of nuclear matrix element calculations needed for determining the effective neutrino mass from zero-neutrino double-beta decay data. We also present new limits for transitions to higher excited states in Ru-100 which, if improved, may be of interest for more exotic conjectures, like a bosonic component to neutrino statistics.

  19. Structure and critical function of Fe and acid sites in Fe-ZSM-5 in propane oxidative dehydrogenation with N2O and N2O decomposition

    E-Print Network [OSTI]

    Sklenak, Stepan

    Structure and critical function of Fe and acid sites in Fe-ZSM-5 in propane oxidative species Steamed Fe-zeolites Mössbauer spectroscopy UV­Vis FTIR H2-TPR N2O decomposition Propane oxidative of propane to propene with N2O. The evacuated non-steamed FeH-ZSM-5 contained high concentration of Brønsted

  20. Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma Chuan-Bing Rong, Vikas Nandwana, Narayan Poudyal, and J. Ping Liua

    E-Print Network [OSTI]

    Liu, J. Ping

    Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering Chuan-Bing Rong, Vikas nanocomposite magnets from nano- particles remains a great challenge. Spark plasma sintering SPS is known as one; published online 27 April 2007 FePt/Fe3Pt bulk nanocomposite magnets have been prepared by the spark plasma

  1. Photovoltaic properties of Aurivillius phase Bi{sub 5}FeTi{sub 3}O{sub 15} thin films grown by pulsed laser deposition

    SciTech Connect (OSTI)

    Kooriyattil, Sudheendran [Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, P.O. Box 70377, San Juan, Puerto Rico 00936-8377 (United States); Department of Physics, Sree Kerala Varma College, Thrissur 680011, Kerala (India); Katiyar, Rajesh K.; Pavunny, Shojan P., E-mail: rkatiyar@uprrp.edu, E-mail: shojanpp@gmail.com; Morell, Gerardo; Katiyar, Ram S., E-mail: rkatiyar@uprrp.edu, E-mail: shojanpp@gmail.com [Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, P.O. Box 70377, San Juan, Puerto Rico 00936-8377 (United States)

    2014-08-18T23:59:59.000Z

    We report a remarkable photovoltaic effect in pulsed laser deposited multiferroic aurivillius phase Bi{sub 5}FeTi{sub 3}O{sub 15} (BFTO) thin films sandwiched between ZnO:Al transparent conductive oxide top electrode and SrRuO{sub 3} bottom electrode fabricated on amorphous fused silica substrates. The structural and micro structural properties of these films were analysed by X-ray diffraction and atomic force microscopy techniques. The films were showing a photo sensitive ferroelectric behaviour with a notable apparent polarization in the range of 10–15??C/cm{sup 2}. These films also exhibited a switchable photo-response and this parameter was observed to be sensitive to polarisation field and the polarization direction. The device shows a large ON/OFF photo current ratio with an open circuit voltage of 0.14?V. The photo response at zero bias of this BFTO based heterostructures showed rapid increase to a saturation value of 6??A at zero bias.

  2. Fe(III) Oxide Reactivity Toward Biological versus Chemical

    E-Print Network [OSTI]

    Roden, Eric E.

    amorphous materials, such as ferrihydrite, to well-crystallized minerals such as goethite and hematite (5 assemblages. Experimental Section Oxide Synthesis and Characterization.A variety of synthetic Fe(III) oxides included a series of goethites with differing crystallinity and surface area, synthesized from Fe(NO3

  3. CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL...

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

    CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE. CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL...

  4. Insights into the Mechanism of Fe(II) Adsorption and Oxidation...

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

    Mechanism of Fe(II) Adsorption and Oxidation at Fe-Clay Mineral Surfaces from First-Principles Calculations. Insights into the Mechanism of Fe(II) Adsorption and Oxidation at...

  5. Synthesis and Photoexcited Charge Carrier Dynamics of beta-FeOOH...

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

    Photoexcited Charge Carrier Dynamics of beta-FeOOH Nanorods. Synthesis and Photoexcited Charge Carrier Dynamics of beta-FeOOH Nanorods. Abstract: Akaganeite(B-FeOOH) nanorods of...

  6. Oxygen Plasma Activation of Cr(CO)(6) on ?-Fe2O3(0001)...

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

    on ?-Fe2O3(0001). Abstract: The chemistry of Cr(CO)6 on the Fe3O4(111) surface termination of ?-Fe2O3(0001) was explored using temperature programmed desorption (TPD),...

  7. Water Adsorption, Desorption, and Clustering on FeO(111). | EMSL

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

    Adsorption, Desorption, and Clustering on FeO(111). Water Adsorption, Desorption, and Clustering on FeO(111). Abstract: The adsorption of water on FeO(111) is investigated using...

  8. Kinetics of Fe(II)-catalyzed transformation of 6-line ferrihydrite under anaerobic flow conditions

    E-Print Network [OSTI]

    Yang, L.

    2010-01-01T23:59:59.000Z

    transformation to goethite via the Fe(II) pathway. Am.ferrihydrite, and goethite. Geochim. Cosmochim. Acta 2001,between Aqueous Fe(II) and Goethite: An Fe Isotope Tracer

  9. Anharmonic phonons and magnons in BiFeO3

    SciTech Connect (OSTI)

    Delaire, Olivier A [ORNL; Ma, Jie [ORNL; Stone, Matthew B [ORNL; Huq, Ashfia [ORNL; Gout, Delphine J [ORNL; Brown, Craig [National Institute of Standards and Technology (NIST); Wang, Kefeng [Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing; Ren, Zhifeng [Boston College, Chestnut Hill

    2012-01-01T23:59:59.000Z

    The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO3 were measured for temperatures 200 < T < 750K , using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO3 closely resembles that of similar Fe perovskites, such as LaFeO3, despite the cycloid modulation in BiFeO3. We do not find any evidence for a spin gap. A strong T-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.

  10. Doc.~:Ru.

    Office of Legacy Management (LM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTableSelling CorpNew 1325.8. (8-89)p,Departtient,of-JAN26.' ,

  11. Ru!fsa!!

    Office of Legacy Management (LM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA groupTuba City, Arizona, DisposalFourthN V O 1 8 7 +NewAugustr* R

  12. Microbial Reduction of Fe(III) in the Fithian and Muloorina Illites...

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

    Fe(III) in the Fithian and Muloorina Illites : Contrasting Extents and Rates of Bioreduction. Microbial Reduction of Fe(III) in the Fithian and Muloorina Illites : Contrasting...

  13. Heterogeneous Reduction of U6+ by Structural Fe2+ From Theory...

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

    U6+ by Structural Fe2+ From Theory and Experiment. Heterogeneous Reduction of U6+ by Structural Fe2+ From Theory and Experiment. Abstract: Computational and experimental studies...

  14. Fine structure of Fe-Co-Ga and Fe-Cr-Ga alloys with low Ga content

    SciTech Connect (OSTI)

    Kleinerman, Nadezhda M., E-mail: kleinerman@imp.uran.ru; Serikov, Vadim V., E-mail: kleinerman@imp.uran.ru; Vershinin, Aleksandr V., E-mail: kleinerman@imp.uran.ru; Mushnikov, Nikolai V., E-mail: kleinerman@imp.uran.ru; Stashkova, Liudmila A., E-mail: kleinerman@imp.uran.ru [Institute of Metal Physics UB RAS, S. Kovalevskaya str. 18, 620990 Ekaterinburg (Russian Federation)

    2014-10-27T23:59:59.000Z

    Investigation of Ga influence on the structure of Fe-Cr and Fe-Co alloys was performed with the use of {sup 57}Fe Mössbauer spectroscopy and X-ray diffraction methods. In the alloys of the Fe-Cr system, doping with Ga handicaps the decomposition of solid solutions, observed in the binary alloys, and increases its stability. In the alloys with Co, Ga also favors the uniformity of solid solutions. The analysis of Mössbauer experiments gives some grounds to conclude that if, owing to liquation, clusterization, or initial stages of phase separation, there exist regions enriched in iron, some amount of Ga atoms prefer to enter the nearest surroundings of iron atoms, thus forming binary Fe-Ga regions (or phases)

  15. Ru-induced loss of long-range magnetic order in a-Fe90 xRuxZr10 Physics Department, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada

    E-Print Network [OSTI]

    Ryan, Dominic

    , The University of New South Wales, Sydney, NSW 2052, Australia Zin Tun AECL, Chalk River Laboratories, Chalk the DUALSPEC triple-axis spectrometer at AECL, Chalk River. Initial polarizations of 95% at 0.237 nm were

  16. Epitaxial Fe3-xTixO4 films from magnetite to ulvöspinel by pulsed laser deposition

    E-Print Network [OSTI]

    Droubay, T.C.

    2012-01-01T23:59:59.000Z

    Fe O Fig. 1. Droubay et al. PRB Intensity (Counts) Fe 2 TiOdeg) Fig. 2. Droubay et al. PRB Fe 2p 3/2 Intensity Fe 2peV) Fig. 3. Droubay et al. PRB Fe 2.75 Ti 0.25 O 4 Fe 2.50

  17. Solution medium control of the photoredox yield in the Ru(bpy)/sub 3//sup 2 +//methyl viologen/EDTA system

    SciTech Connect (OSTI)

    Mandal, K.; Hoffman, M.Z.

    1984-01-19T23:59:59.000Z

    The observed quantum yield of formation of the methyl viologen radical cation, phi(MV/sup +/-), upon 450-nm irradiation of the Ru(bpy)/sub 3//sup 2 +//methyl viologen dication/EDTA system at pH 11.0 is dependent on the concentrations of all three components. Under the conditions of the experiments, phi(MV/sup +/-)approx. =2eta/sub cr/ where eta/sub cr/ is the efficiency of release of redox products from the solvent cage. The maximum value of eta/sub cr/ is approx. =0.17 at high concentrations of all components where the photosensitizer, electron relay, and sacrificial electron donor exist as ion-paired aggregates within a single solvent-caged unit. 3 figures.

  18. Local magnetism in the molecule-based metamagnet [Ru2(O2CMe)4]3[Cr(CN)6] probed with implanted muons

    SciTech Connect (OSTI)

    Lancaster, T. [University of Oxford; Pratt, F. L. [ISIS Facility, Rutherford Appleton Laboratory; Blundell, S. J. [University of Oxford; Steele, Andrew J. [University of Oxford; Baker, Peter J. [ISIS Facility, Rutherford Appleton Laboratory; Wright, Jack D. [University of Oxford; Fishman, Randy Scott [ORNL; Miller, Joel S. [University of Utah

    2011-01-01T23:59:59.000Z

    We present a muon-spin relaxation study of local magnetism in the molecule-based metamagnet [Ru2(O2CMe)4]3[Cr(CN)6]. We observe magnetic order with TN = 33 K, although above 25 K the sublattice spins become less rigid and a degree of static magnetic disorder is observed. The comparison of measurements in applied magnetic field with simulations allows us to understand the origin of the muon response across the metamagnetic transition and to map out the phase diagram of the material. Applied hydrostatic pressures of up to 6 kbar lead to an increase in the local magnetic field along with a complex change in the internal magnetic field distribution.

  19. Synthesis and characterization of redox polymers of (M(4-vinyl-4 prime -methyl-2,2 prime -bipyridine) sub 3 )(PF sub 6 ) sub 2 (M = Ru, Os)

    SciTech Connect (OSTI)

    Bommarito, S.L.; Lowery-Bretz, S.P.; Abruna, H.D. (Cornell Univ., Ithaca, NY (United States))

    1992-02-05T23:59:59.000Z

    The authors have prepared polymers of (M(vbpy){sub 3}(PF{sub 6}){sub 2}) (M = Ru, Os) (vbpy = 4-vinyl-4{prime}-methyl-2,2{prime}-bipyridine) in solution via free-radical polymerization and fractionated them according to molecular weight using size exclusion chromatography. Different fractions have been characterized by electrochemical and spectroscopic means. The authors find that whereas for the osmium containing polymers the relative polymer size varies in proportion to the number of vinyl groups consumed during the polymerization reaction, the same is not true for the analogous ruthenium polymers. In addition, the emission energy of both the ruthenium and osmium polymers is also related to the concentration of residual vinyl groups in the polymer. Upon polymerization, there is a shift in the emission toward higher energies. Electrochemically determined diffusion coefficients are consistent with the relative size of the various fractions.

  20. Pulsed-electron-beam melting of Fe

    SciTech Connect (OSTI)

    Knapp, J.A.; Follstaedt, D.M.

    1981-01-01T23:59:59.000Z

    Pulsed (50 nsec) electron beams with deposited energies of 1.1 to 2.3 J/cm/sup 2/ have been used to rapidly melt a surface layer of Fe. Calculations show that this range of energies produces melt depths from 0.4 to 1.2 ..mu..m and melt times of 100 to 500 nsec. Optical microscopy and SEM of pulse treated polycrystalline foils show slip traces, as well as a general smoothing of surface features which shows that melting has occurred. TEM shows that the resolidified material is bcc, and that the material within a grain is epitaxial with the substrate. TEM also shows slip traces along (110) planes, as well as a high density of dislocations, both extended and loop. At the highest energy, subgrain boundaries are observed. Some samples were implanted with 1 x 10/sup 16/ Sn/cm/sup 2/ at 150 keV. After pulse treatment, the Sn depth profile was observed to have broadened, consistent with liquid phase diffusion. The Sn had the unexpected effect of suppressing slip at the sample surface.

  1. Feasibility of band gap engineering of pyrite FeS?

    E-Print Network [OSTI]

    Sun, Ruoshi

    We use first-principles computations to investigate whether the band gap of pyrite FeS? can be increased by alloying in order to make it a more effective photovoltaic material. In addition to the isostructural compounds ...

  2. Hydrogen-Vacancy Interactions in Fe-C Alloys

    E-Print Network [OSTI]

    Yip, Sidney

    Energetics and concentrations of hydrogen-containing point defect clusters (PDCs) in Fe-C alloys are calculated and cast into a PDC dominance diagram. Because of the strong binding effects of iron vacancies on the stability ...

  3. Simulated magnetization reversal in Fe nanopillar S. H. Thompson

    E-Print Network [OSTI]

    Weston, Ken

    Simulated magnetization reversal in Fe nanopillar S. H. Thompson Florida State University and Center for Materials Research and Technology. 1 S. H. Thompson, G. Brown, and P. A. Rikvold, J. Appl

  4. Clean Energy- FE Dkt No. 14-54-LNG (FTA)

    Broader source: Energy.gov [DOE]

    The Office of Fossil Energy (FE) of the Department of Energy (DOE) gives notice of receipt of an application filed on March 18, 2014, by Clean Energy, requesting blanket authorization to engage in...

  5. PRECIPITATION-STRENGTHENED AUSTENITIC FE-MN-TI ALLOYS

    E-Print Network [OSTI]

    Chiang, K.-M.

    2010-01-01T23:59:59.000Z

    energy spectrums showing that precipitates are rich in titanium, andtitanium additions can reduce the austenitic stacking fault energyfault energy of the Fe-Mn austenite is lowered by titanium

  6. fe0013531-Oregon-State | netl.doe.gov

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

    DE-FE0013531 Goal The goal of this project is to study the biogeochemical response of the gas hydrate system on the Svalbard margin to environmental change. Performer Oregon State...

  7. Fe-CYCLE BACTERIA FROM INDUSTRIAL CLAYS MINED IN GEORGIA, USA EVGENYA S. SHELOBOLINA

    E-Print Network [OSTI]

    Lovley, Derek

    Fe-CYCLE BACTERIA FROM INDUSTRIAL CLAYS MINED IN GEORGIA, USA EVGENYA S. SHELOBOLINA 1, *,{, SAM M are major discoloring impurities in mined commercial white kaolin clay. In order to evaluate the potential influence of Fe-cycle bacteria on Fe cycling during post- depositional clay-weathering alteration, Fe

  8. NITRIDATION EFFECTS ON THE OXIDATION MECHANISMS OF AN ODS FeAl INTERMETALLIC ALLOY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    NITRIDATION EFFECTS ON THE OXIDATION MECHANISMS OF AN ODS FeAl INTERMETALLIC ALLOY F. Pedraza*, J-mail: fpedraza@univ-lr.fr Abstract An ODS FeAl intermetallic alloy has been nitrided at low-energy high flux of an ODS FeAl alloy have been discussed [13], indicating the formation of AlN and again of -Fe after

  9. Demonstration of Security Benefits of Renewable Generation at FE Warren Air Force Base

    SciTech Connect (OSTI)

    Warwick, William M.; Myers, Kurt; Seifert, Gary

    2010-12-31T23:59:59.000Z

    Report detailing field demonstration of security benefits of renewable generation at FE Warren Air Force Base.

  10. Determination of the stellar (n,$\\gamma$) cross section of $^{54}Fe$ with accelerator mass spectrometry

    E-Print Network [OSTI]

    Coquard, L; Dillmann, I; Wallner, A; Knie, K; Kutschera, W

    2006-01-01T23:59:59.000Z

    Determination of the stellar (n,$\\gamma$) cross section of $^{54}Fe$ with accelerator mass spectrometry

  11. A nuclear magnetic resonance probe of Fe-Al and Al20V2Eu intermetallics

    E-Print Network [OSTI]

    Chi, Ji

    2009-05-15T23:59:59.000Z

    Al-rich Fe-Al systems (FeAl2, Fe2 Al5 and Fe4Al13) and Al20V2Eu have complicated structures with quasicrystal-like features making these materials potentially of interest for magnetic behavior. However, there is not much work on these materials...

  12. Structural and electronic properties of Fe3+ in GaN from optical and EPR experiments

    E-Print Network [OSTI]

    Nabben, Reinhard

    into GaN to compensate inherent n-type conductivity and to produce semi-insulating substrate materialStructural and electronic properties of Fe3+ and Fe2+ centers in GaN from optical and EPR, and electronic properties of Fe-doped GaN. A set of high-quality GaN crystals doped with Fe at concentrations

  13. Mössbauer investigations of hyperfine interactions features of {sup 57}Fe nuclei in BiFeO{sub 3} ferrite

    SciTech Connect (OSTI)

    Sobolev, Alexey, E-mail: salex12@rambler.ru; Presniakov, Igor, E-mail: salex12@rambler.ru; Rusakov, Vyacheslav, E-mail: salex12@rambler.ru; Matsnev, Mikhail; Gorchakov, Dmitry; Glazkova, Iana [Lomonosov Moscow State University, 119991, Moscow (Russian Federation); Belik, Alexey [International Center for Materials Nanoarchitectonics (MANA), National Institute for Material Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 (Japan)

    2014-10-27T23:59:59.000Z

    New results of {sup 57}Fe Mössbauer studies on BiFeO{sub 3} powder sample performed at various temperatures above and below magnetic phase transitions point T{sub N} ? 640K are reported. We have performed self-consistent calculations of the lattice contributions to the EFG tensor, taking into account dipole moments of the O{sup 2?} and Bi{sup 3+} ions. Low-temperature {sup 57}Fe Mössbauer spectra recorded at T < T{sub N} were analyzed assuming an anharmonic cycloidal modulation of the Fe{sup 3+} magnetic moments. The cycloidal modulation of the iron spin was described with the elliptic Jacobi function sn[(±4K(m)/?)x,m]. The good fit of the experimental spectra was obtained for the anharmonicity m = 0.44 ± 0.04 (T = 4.9K) resulting from the easy-axis magnetic anisotropy.

  14. Heterogeneous Reduction of PuO2 with Fe(II): Importance of the Fe(III) Reaction Product

    SciTech Connect (OSTI)

    Felmy, Andrew R.; Moore, Dean A.; Rosso, Kevin M.; Qafoku, Odeta; Rai, Dhanpat; Buck, Edgar C.; Ilton, Eugene S.

    2011-05-01T23:59:59.000Z

    Abstract Heterogeneous reduction of actinides in higher and more soluble oxidation states to lower more insoluble oxidation states by reductants such as Fe(II) has been the subject of intensive study for more than two decades. However, Fe(II)-induced reduction of sparingly soluble Pu(IV) to the more soluble lower oxidation state Pu(III) has been much less studied even though such reactions can potentially increase the mobility of Pu in the subsurface. Thermodynamic calculations are presented that show how differences in the free energy of various possible solid-phase Fe(III) reaction products can greatly influence aqueous Pu(III) concentrations resulting from reduction of PuO2(am) by Fe(II). We present the first experimental evidence that reduction of PuO2(am) to Pu(III) by Fe(II) was enhanced when the Fe(III) mineral goethite was spiked into the reaction. The effect of goethite on reduction of Pu(IV) was demonstrated by measuring the time-dependence of total aqueous Pu concentration, its oxidation state, and system pe/pH. We also re-evaluated established protocols for determining Pu(III) [(Pu(III) + Pu(IV)) - Pu(IV)] by using thenoyltrifluoroacetone (TTA) in toluene extractions; the study showed that it is important to eliminate dissolved oxygen from the TTA solutions for accurate determinations. More broadly, this study highlights the importance of the Fe(III) reaction product in actinide reduction rate and extent by Fe(II).

  15. Composition-Mediated Order-Disorder Transformation in FePt Nanoparticles

    SciTech Connect (OSTI)

    Johnston-Peck, Aaron C [ORNL; Cullen, David A [ORNL; Tracy, Joseph B [North Carolina State University

    2013-01-01T23:59:59.000Z

    Thumbnail image of graphical abstract Heat-treated alloy FePt nanoparticles transform into L10 FePt and mixed L10/L12 FePt3 intermetallic phases. Enrichment in Pt in some nanoparticles, rather than intrinsic thermodynamic effects, drives phase segregation. FePt nanoparticles of uniform, equimolar composition are expected to transform into phase-pure, highly ordered L10 FePt nanoparticles.

  16. Lightest Isotope of Bh Produced Via the 209Bi(52Cr,n)260Bh Reaction

    E-Print Network [OSTI]

    2007-01-01T23:59:59.000Z

    models. For many years, “cold fusion” reactions utilizingproduced via the new “cold fusion” reaction 209 Bi( 52 Cr,

  17. N2s2 chelating agents as cys-x-cys biomimics for fe(no) and fe(no)2 complexes 

    E-Print Network [OSTI]

    Chiang, Chao-Yi

    2006-08-16T23:59:59.000Z

    model complexes I have examined the fundamental properties of a dithiolato-Fe(NO)2 complex, bismercaptoethandiazacyclooctane iron dinitrosyl or (H+bme-daco)Fe(NO)2 as a biomimic of dicysteinate coordination of [Fe(NO)2]. This complex was prepared...

  18. PHYSICAL REVIEW B 83, 104526 (2011) Fe Mossbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals

    E-Print Network [OSTI]

    Ryan, Dominic

    2011-01-01T23:59:59.000Z

    PHYSICAL REVIEW B 83, 104526 (2011) 57 Fe M¨ossbauer study of magnetic ordering in superconducting 31 March 2011) The magnetic ordering of superconducting single crystals of K0.80Fe1.76Se2.00 has been studied between 10 and 550 K using 57 Fe M¨ossbauer spectroscopy. Despite being superconducting below Tsc

  19. N2s2 chelating agents as cys-x-cys biomimics for fe(no) and fe(no)2 complexes

    E-Print Network [OSTI]

    Chiang, Chao-Yi

    2006-08-16T23:59:59.000Z

    model complexes I have examined the fundamental properties of a dithiolato-Fe(NO)2 complex, bismercaptoethandiazacyclooctane iron dinitrosyl or (H+bme-daco)Fe(NO)2 as a biomimic of dicysteinate coordination of [Fe(NO)2]. This complex was prepared...

  20. Dual and Triple Ion-Beam Irradiations of Fe, Fe(Cr) and Fe(Cr)-ODS Final Report: IAEA SMoRE CRP

    SciTech Connect (OSTI)

    Fluss, M J; Hsiung, L L; Marian, J

    2011-11-20T23:59:59.000Z

    Structures of nanoparticles in Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y2O3 (K3) and Fe-20Cr-4.5Al-0.34Ti-0.5Y2O3 (MA956) oxide dispersion strengthened (ODS) ferritic steels produced by mechanical alloying (MA) and followed by hot extrusion have been studied using high-resolution transmission electron microscopy (HRTEM) techniques to gain insight about the formation mechanism of nanoparticles in MA/ODS steels. The observations of Y-Al-O complex-oxide nanoparticles in both ODS steels imply that decomposition of Y2O3 in association with internal oxidation of Al occurred during mechanical alloying. While the majority of oxide nanoparticles formed in both steels is Y4Al2O9, a few oxide particles of YAlO3 are also occasionally observed. These results reveal that Ti (0.3 wt %) plays an insignificant role in forming oxide nanoparticles in the presence of Al (4.5 wt %). HRTEM observations of crystalline nanoparticles larger than {approx}2 nm and amorphous or disordered cluster domains smaller than {approx}2 nm provide an insight into the formation mechanism of oxide nanoparticle in MA/ODS steels, which we believe from our observations involves a solid-state amorphous precursor followed by recrystallization. Dual ion-beam irradiations using He{sup +} + Fe{sup +8} ions were employed to gain more detailed insight about the role of nanoparticles in suppressing radiation-induced swelling. This is elaborated through TEM examinations of cavity distributions in ion-irradiated Fe-14Cr and K3-ODS ferritic steels. HRTEM observations of helium-filled cavities (helium bubbles) preferably trapped at nanoscale oxide particles and clusters in ion-irradiated K3-ODS are presented. Finally, we describe the results from triple ion-beam irradiations using H{sup +} + He{sup +} + Fe{sup +8} ions to emulate fusion first wall radiation effects. Preliminary work is reported that confirms the existence of significant hydrogen synergistic effects described earlier by Tanaka et al., for Fe(Cr) and by Wakai et al., for F82H reduced activation ferritic martensitic (RAF/M) steel. These previous results combined with our data suggest a complex new 'catalytic' mechanism whereby H interacts with the steady state population of defects and the embryonic cavities so as to accelerated cavity (void) growth in both Fe(Cr) and under special conditions in ODS steels.

  1. Unique Properties of Lunar Impact Glass: Nanophase Metallic Fe Synthesis

    SciTech Connect (OSTI)

    Liu, Yang [University of Tennessee, Knoxville (UTK); Taylor, Lawrence A. [University of Tennessee, Knoxville (UTK); Thompson, James R [ORNL; Schnare, Darren W. [University of Tennessee, Knoxville (UTK); Park, Jae-Sung [University of Tennessee, Knoxville (UTK)

    2007-01-01T23:59:59.000Z

    Lunar regolith contains important materials that can be used for in-situ resource utilization (ISRU) on the Moon, thereby providing for substantial economic savings for development of a manned base. However, virtually all activities on the Moon will be affected by the deleterious effects of the adhering, abrasive, and pervasive nature of lunar dust (<20 {micro}m portion of regolith, which constitutes {approx}20 wt% of the soil). In addition, the major impact-produced glass in the lunar soil, especially agglutinitic glass (60-80 vol% of the dust), contains unique nanometer-sized metallic Fe (np-Fe{sup 0}), which may pose severe pulmonary problems for humans. The presence of the np-Fe0 imparts considerable magnetic susceptibility to the fine portion of the lunar soil, and dust mitigation techniques can be designed using these magnetic properties. The limited availability of Apollo lunar soils for ISRU research has made it necessary to produce materials that simulate this unique np-Fe{sup 0} property, for testing different dust mitigation methods using electromagnetic fields, and for toxicity studies of human respiratory and pulmonary systems, and for microwave treatment of lunar soil to produce paved roads, etc. A method for synthesizing np-Fe{sup 0} in an amorphous silica matrix is presented here. This type of specific simulant can be used as an additive to other existing lunar soil simulants.

  2. Fe-doped InN layers grown by molecular beam epitaxy

    SciTech Connect (OSTI)

    Wang Xinqiang; Liu Shitao; Ma Dingyu; Zheng Xiantong; Chen Guang; Xu Fujun; Tang Ning; Shen Bo [State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871 (China); Zhang Peng; Cao Xingzhong; Wang Baoyi [State Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China); Huang Sen; Chen, Kevin J. [Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology (Hong Kong); Zhou Shengqiang [Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01314 Dresden (Germany); Yoshikawa, Akihiko [Center for SMART Green Innovation Research, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522 (Japan)

    2012-10-22T23:59:59.000Z

    Iron(Fe)-doped InN (InN:Fe) layers have been grown by molecular beam epitaxy. It is found that Fe-doping leads to drastic increase of residual electron concentration, which is different from the semi-insulating property of Fe-doped GaN. However, this heavy n-type doping cannot be fully explained by doped Fe-concentration ([Fe]). Further analysis shows that more unintentionally doped impurities such as hydrogen and oxygen are incorporated with increasing [Fe] and the surface is degraded with high density pits, which probably are the main reasons for electron generation and mobility reduction. Photoluminescence of InN is gradually quenched by Fe-doping. This work shows that Fe-doping is one of good choices to control electron density in InN.

  3. Single-crystal epitaxial thin films of SrFeO{sub 2} with FeO{sub 2} 'infinite layers'

    SciTech Connect (OSTI)

    Inoue, Satoru; Kawai, Masanori; Shimakawa, Yuichi [Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan); Mizumaki, Masaichiro; Kawamura, Naomi [Japan Synchrotron Radiation Research Institute/SPring-8, Sayo, Hyogo 679-5198 (Japan); Watanabe, Takashi; Tsujimoto, Yoshihiro; Kageyama, Hiroshi; Yoshimura, Kazuyoshi [Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502 (Japan)

    2008-04-21T23:59:59.000Z

    Single-crystal thin films of SrFeO{sub 2}, which is an oxygen-deficient perovskite with ''infinite layers'' of Fe{sup 2+}O{sub 2}, were prepared by using CaH{sub 2} for low-temperature reduction of epitaxial SrFeO{sub 2.5} single-crystal films deposited on KTaO{sub 3} substrates. This reduction process, removing oxygen ions from the perovskite structure framework and causing rearrangements of oxygen ions, topotactically transforms the brownmillerite SrFeO{sub 2.5} to the c-axis oriented SrFeO{sub 2}.

  4. Anomalous codeposition of Fe-Ni alloys and Fe-Ni-SiO{sub 2} composites under potentiostatic conditions: Experimental study and mathematical model

    SciTech Connect (OSTI)

    Ramasubramanian, M.; Popova, S.N.; Popov, B.N.; White, R.E. [Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering; Yin, K.M. [Yuan-Ze Inst. of Tech., Taoyuan (Taiwan, Province of China)

    1996-07-01T23:59:59.000Z

    A mathematical model has been developed to describe the electrodeposition of Fe-Ni alloys and Fe-Ni-SiO{sub 2} composites under potentiostatic conditions. This model can be used to predict the polarization behavior, partial current densities, and alloy composition of each of the components as a function of the applied potential. Fe-Ni-SiO{sub 2} samples were deposited on platinum rotating disk electrodes from sulfate electrolytes under potentiostatic conditions, and the results obtained were compared to the model. The model predictions were found to agree well with the experimental observations for the Fe-Ni and Fe-Ni-SiO{sub 2} systems.

  5. Structural and Electrochemical Characterization of PureLiFePO4and Nanocomposite C-LiFePO4Cathodes for Lithium Ion Rechargeable Batteries

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

    Kumar, Arun; Thomas, R.; Karan, N. K.; Saavedra-Arias, J. J.; Singh, M. K.; Majumder, S. B.; Tomar, M. S.; Katiyar, R. S.

    2009-01-01T23:59:59.000Z

    Pure lithium iron phosphate (LiFePO4) and carbon-coatedLiFePO4(C-LiFePO4) cathode materials were synthesized for Li-ion batteries. Structural and electrochemical properties of these materials were compared. X-ray diffraction revealed orthorhombic olivine structure. Micro-Raman scattering analysis indicates amorphous carbon, and TEM micrographs show carbon coating onLiFePO4particles. Ex situ Raman spectrum of C-LiFePO4at various stages of charging and discharging showed reversibility upon electrochemical cycling. The cyclic voltammograms ofLiFePO4and C-LiFePO4showed only a pair of peaks corresponding to the anodic and cathodic reactions. The first discharge capacities were 63, 43, and 13?mAh/g for C/5, C/3, and C/2, respectively forLiFePO4where as in case of C-LiFePO4that were 163, 144,more »118, and 70?mAh/g for C/5, C/3, C/2, and 1C, respectively. The capacity retention of pureLiFePO4was 69% after 25 cycles where as that of C-LiFePO4was around 97% after 50 cycles. These results indicate that the capacity and the rate capability improved significantly upon carbon coating.« less

  6. Synthesis and characterization of Fe(III)-silicate precipitation tubes

    SciTech Connect (OSTI)

    Parmar, K.; Pramanik, A.K. [National Metallurgical Laboratory, Council of Scientific and Industrial Research, Burmamines, Jamshedpur 831007 (India)] [National Metallurgical Laboratory, Council of Scientific and Industrial Research, Burmamines, Jamshedpur 831007 (India); Bandyopadhya, N.R. [Bengal Engineering and Science University, Shibpur, Howrah 711103 (India)] [Bengal Engineering and Science University, Shibpur, Howrah 711103 (India); Bhattacharjee, S., E-mail: santanu@nmlindia.org [National Metallurgical Laboratory, Council of Scientific and Industrial Research, Burmamines, Jamshedpur 831007 (India)

    2010-09-15T23:59:59.000Z

    Fe(III)-silicate precipitation tubes synthesized through 'silica garden' route have been characterized using a number of analytical techniques including X-ray diffraction, infrared spectroscopy, atomic force microscopy, scanning and transmission electron microscopy. These tubes are brittle and amorphous and are hierarchically built from smaller tubes of 5-10 nm diameters. They remain amorphous at least up to 650 {sup o}C. Crystobalite and hematite are the major phases present in Fe(III)-silicate tubes heated at 850 {sup o}C. Morphology and chemical compositions at the external and internal walls of these tubes are remarkably different. These tubes are porous with high BET surface area of 291.2 m{sup 2}/g. Fe(III)-silicate tubes contain significant amount of physically and chemically bound moisture. They show promise as an adsorbent for Pb(II), Zn(II), and Cr(III) in aqueous medium.

  7. Beta-decay properties of neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes from deformed quasiparticle random-phase approximation

    E-Print Network [OSTI]

    P. Sarriguren

    2015-04-07T23:59:59.000Z

    Beta-decay properties of even and odd-A neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes involved in the astrophysical rapid neutron capture process are studied within a deformed proton-neutron quasiparticle random-phase approximation. The underlying mean field is described self-consistently from deformed Skyrme Hartree-Fock calculations with pairing correlations. Residual interactions in the particle-hole and particle-particle channels are also included in the formalism. The isotopic evolution of the various nuclear equilibrium shapes and the corresponding charge radii are investigated in all the isotopic chains. The energy distributions of the Gamow-Teller strength as well as the beta-decay half-lives are discussed and compared with the available experimental information. It is shown that nuclear deformation plays a significant role in the description of the decay properties in this mass region. Reliable predictions of the strength distributions are essential to evaluate decay rates in astrophysical scenarios.

  8. Iron-phosphorus relationships in Fe chlorisis of sorghum 

    E-Print Network [OSTI]

    Morales-Vargas, Dennis A

    1979-01-01T23:59:59.000Z

    soils, depending on the species or variety of plant grown. Wallace and Lunt (52) indicated that 25 to 30% of the earth's land surface is calcareous. A survey (31) in all states west of the Mississippi River to de- termine the estimated acreage of Fe... as decrease in the yields, whereas, the same quantities of P applied to so1ls with an initial react1on ranging between 3. 5 and 5. 8 may cause stimulation of plant growth and increase of y1elds. In experiments of Fe nutrition of plants at h1gh pH, De...

  9. Room-Temperature Multiferroic Hexagonal LuFeO3

    SciTech Connect (OSTI)

    Cheng, Xuemei [Bryn Mawr College; Balke, Nina [ORNL; Chi, Miaofang [ORNL; Gai, Zheng [ORNL; Keavney, David [Argonne National Laboratory (ANL); Lee, Ho Nyung [ORNL; Shen, Jian [University of Tennessee, Knoxville (UTK); Snijders, Paul C [ORNL; Wang, Wenbin [ORNL; Ward, Thomas Z [ORNL; Xu, Xiaoshan [ORNL; Yi, Jieyu [ORNL; Zhu, Leyi [Argonne National Laboratory (ANL); Christen, Hans M [ORNL; Zhao, Jun [University of California, Berkeley

    2013-01-01T23:59:59.000Z

    We observed the coexistence of ferroelectricity and weak ferromagnetism at room temperature in the hexagonal phase of LuFeO3 stabilized by epitaxial thin film growth. While the ferroelectricity in hexagonal LuFeO3 can be understood as arising from its polar structure, the observation of weak ferromagnetism at room temperature is remarkable considering the frustrated triangular spin structure. An explanation of the room temperature weak ferromagnetism is proposed in terms of a subtle lattice distortion revealed by the structural characterization. The combination of ferroelectricity and weak ferromagnetism in epitaxial films at room temperature offers great potential for the application of this novel multiferroic material in next generation devices.

  10. Iron-phosphorus relationships in Fe chlorisis of sorghum

    E-Print Network [OSTI]

    Morales-Vargas, Dennis A

    1979-01-01T23:59:59.000Z

    IRON-PHOSPHORUS RELATIONSHIPS IN FE CHLOROSIS OF SORGHUM A Thesis by DENNIS A. MORALES-VARGAS Submitted to the Graduate College of Texas A8M University in partial fulfillment of the requirement for the degree of MASl'ER OF SCIENCE December... 1979 Major Subject: Soil Science IRON-PHOSPHORUS RELATIONSHIPS IN FE CHLOROSI OF SORGHUM A Thesis by DENNIS A. MORALES-VARGAS Approved as to style and content by: \\ J(c'w"H~. v& 4 Cc ~. r&'4 wc' c "&"~ / ~Chairman of Committee ! ~Co-' hai...

  11. FE DOCKET NO. 11-59-LNG | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T,OfficeEnd of Year 2010SaltInstrumentation andFE DOCKET NO. 11-59-LNG FE DOCKET

  12. FE FY 2015 Budget Request Presentation | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T,OfficeEnd of Year 2010SaltInstrumentation andFE DOCKET NO. 11-59-LNG FE DOCKETFY

  13. FE Leaders Discuss African Energy Development | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T,OfficeEnd of Year 2010SaltInstrumentation andFE DOCKET NO. 11-59-LNG FE

  14. Crystal structure, magnetism and transport properties of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10}

    SciTech Connect (OSTI)

    Janka, Oliver [Department of Chemistry, University of California, One Shields Ave, Davis, CA 95616 (United States); Baumbach, Ryan E.; Thompson, Joe D. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Bauer, Eric D., E-mail: edbauer@lanl.gov [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Kauzlarich, Susan M., E-mail: smkauzlarich@ucdavis.edu [Department of Chemistry, University of California, One Shields Ave, Davis, CA 95616 (United States)

    2013-09-15T23:59:59.000Z

    Single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10} were obtained from a process in which a polycrystalline sample of CeRu{sub 2}Al{sub 2}B was annealed in an excess of a Ni–In flux. The initial phase, CeRu{sub 2}Al{sub 2}B, does not recrystallize, instead, crystals of a new phase, Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10}, could be isolated once the flux was removed. The title compound crystallizes in the tetragonal space group P4/nmm (No. 129) with a=1139.02(8), c=801.68(6) pm (c/a=0.70) in the Nd{sub 3}Ni{sub 29}Si{sub 4}B{sub 10} structure type. Electrical resistivity measurements reveal metallic behavior with a minimum of 700 µ? cm and a small residual resistivity ratio of RRR=1.4 indicating a large amount of disorder scattering. The cerium atoms are either in the 4+ or an intermediate valence state with a valence fluctuation temperature far above room temperature. - Graphical abstract: Single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}A{sub l4.1}B{sub 10} were obtained using a process in which a polycrystalline sample of CeRu{sub 2}Al{sub 2}B was annealed in an excess of a Ni–In flux. Electrical resistivity measurements reveal metallic behavior with a minimum of 700 ?? cm and a small residual resistivity ratio of RRR=1.4 indicating a large amount of disorder scattering. The cerium atoms are either in the 4+ or an intermediate valence state with a valence fluctuation temperature far above room temperature. Display Omitted - Highlights: • Flux synthesis of high quality single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10} is presented along with the crystal structure, magnetic and transport properties. • The compound is isostructural to Nd{sub 3}Ni{sub 29}Si{sub 4}B{sub 10} but is first of this structure type showing mixed occupancies of d-elements. • This is an intermetallic phase with Ce in either the 4+ or an intermediate valence state. • The fact that this structure with mixed occupied transition metal sites exists suggests that more compounds of this type should be accessible and the physical properties tuned.

  15. k-space spin filtering effect in the epitaxial Fe/Au/Fe/GaAs(001) spin-valve

    SciTech Connect (OSTI)

    Hervé, M.; Tricot, S.; Claveau, Y.; Delhaye, G.; Lépine, B.; Di Matteo, S.; Schieffer, P.; Turban, P., E-mail: pascal.turban@univ-rennes1.fr [Département Matériaux et Nanosciences, Institut de Physique de Rennes, UMR 6251, CNRS-Université de Rennes 1, Campus de Beaulieu, Bât 11E, 35042 Rennes cedex (France)

    2013-11-11T23:59:59.000Z

    The hot-electron magnetotransport of epitaxial Fe/Au/Fe/GaAs(001) spin-valves is investigated by ballistic-electron magnetic microscopy. A magnetocurrent amplitude larger than 500% is observed at room temperature close to the Schottky barrier energy. Remarkably, this magnetocurrent is not significantly affected by the thickness reduction of ferromagnetic films, down to 5 atomic layers of the Fe(001) top electrode. This rather suggests a dominant interfacial spin-filtering effect. Finally, the magnetocurrent is strongly reduced when the effective mass of the semiconductor collector is increased. These observations are consistent with recent theoretical prediction of k-space spin-filtering effect in epitaxial spin-valves attached to a semiconducting lead.

  16. Synthesis and crystal structure of layered chalcogenides [KCuFeS[sub 2] and KCuFeSe[sub 2

    SciTech Connect (OSTI)

    Mujica, C.; Paez, J.; Llanos, J. (Univ. Catolica del Norte, Antofagasta (Chile). Dept. de Quimica)

    1994-03-01T23:59:59.000Z

    The new layer chalcogenides KCuFeS[sub 2] and KCuFeSe[sub 2] have been prepared from the copper iron chalcogenide and potassium carbonate. Both phases crystallize with tetragonal symmetry, in the space group I4/mmm (Nr 139) with a=383.7 (1) pm, c=1338.4 (4) pm and a=397.9 (2) pm, c = 1378.7 (54) pm respectively in the ThCr[sub 2]Si[sub 2]-type structure. The chalcogen atoms form bidimensional layers of edge sharing pyramids. Copper and iron are statistically distributed in tetrahedral sites. The potassium ions are placed in cubic sites between the layers.

  17. The passivation of calcite by acid mine water. Column experiments with Fe(III)- SO4-H+ and Fe(III)-Cl-H+ solutions at pH 2

    E-Print Network [OSTI]

    Boi, Marco

    2010-01-01T23:59:59.000Z

    transformation into goethite and jarosite. Geochimica etwith respect to goethite, hematite and schwertmannite (Fe(+ solutions. Schwertmannite and goethite appeared as the Fe(

  18. Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt...

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

    Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt. No. - 15-33-LNG Bear Head LNG Corporation and Bear Head LNG (USA), LLC - FE Dkt. No. - 15-33-LNG The Office of...

  19. CE FLNG, LLC - FE DKT. NO. 12-123-LNG - ORDER 3193 | Department...

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

    CE FLNG, LLC - FE DKT. NO. 12-123-LNG - ORDER 3193 CE FLNG, LLC - FE DKT. NO. 12-123-LNG - ORDER 3193 No reports submitted for this docket. More Documents & Publications...

  20. The Effects of Hydrocarbons on NOx Reduction over Fe-based SCR...

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

    Hydrocarbons on NOx Reduction over Fe-based SCR Catalyst The Effects of Hydrocarbons on NOx Reduction over Fe-based SCR Catalyst Study of effects of hydrocarbons on ammonia storage...

  1. Non-ideal liquidus curve in the Fe-S system and Mercury's snowing core

    E-Print Network [OSTI]

    Hauck II, Steven A.

    was quenched by shutting off the power to the furnace. Recovered run products were polished, carbon-coated]. Stoichiometric mixtures of Fe and FeS were dried and packed into MgO capsules. High temperature was generated

  2. Charge transport in micas: The kinetics of FeII/III electron...

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

    transport in micas: The kinetics of FeIIIII electron transfer in the octahedral sheet. Charge transport in micas: The kinetics of FeIIIII electron transfer in the octahedral...

  3. An Ab Initio Model of Electron Transport in Hematite (a-Fe2O3...

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

    An Ab Initio Model of Electron Transport in Hematite (a-Fe2O3) Basal Planes. An Ab Initio Model of Electron Transport in Hematite (a-Fe2O3) Basal Planes. Abstract: Transport of...

  4. Electrical transport properties of Ti-doped Fe2O3(0001) epitaxial...

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

    Electrical transport properties of Ti-doped Fe2O3(0001) epitaxial films. Electrical transport properties of Ti-doped Fe2O3(0001) epitaxial films. Abstract: The electrical transport...

  5. Excited Carrier Dynamics of ?-Cr2O3/?-Fe2O3 Core...

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

    Excited Carrier Dynamics of ?-Cr2O3?-Fe2O3 Core-Shell Nanostructures. Excited Carrier Dynamics of ?-Cr2O3?-Fe2O3 Core-Shell Nanostructures. Abstract: In...

  6. Carrier Dynamics in a-Fe2O3 (0001) Thin Films and Single Crystals...

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

    Carrier Dynamics in a-Fe2O3 (0001) Thin Films and Single Crystals Probed by Femtosecond Transient Absorption and Reflectivity. Carrier Dynamics in a-Fe2O3 (0001) Thin Films and...

  7. Template-directed FeCo nanoshells on AuCu. | EMSL

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

    on AuCu. Abstract: A synthetic route is reported to achieve a precise control of FeCo shell growth on AuCu cores, leading to AuCuFeCo core-shell nanoparticles, which could...

  8. Isotopic Fractionation of Mg2+(aq), Ca2+(aq), and Fe2+(aq) with...

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

    Fractionation of Mg2+(aq), Ca2+(aq), and Fe2+(aq) with Carbonate Minerals. Isotopic Fractionation of Mg2+(aq), Ca2+(aq), and Fe2+(aq) with Carbonate Minerals. Abstract: Density...

  9. Characterization of natural titanomagnetites (Fe3-xTixO4) for...

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

    as those at the Hanford nuclear reservation, Washington, USA, are rich in Fe-bearing minerals of mixed valence. These minerals are redox reactive with aqueous O2 or Fe(II), and...

  10. Effects of Laser Energy and Wavelength on the Analysis of LiFePO4...

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

    Laser Energy and Wavelength on the Analysis of LiFePO4 Using Laser Assisted Atom Probe Tomography. Effects of Laser Energy and Wavelength on the Analysis of LiFePO4 Using Laser...

  11. Analysis of Fe Nanoparticles Using XPS Measurements Under D.C...

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

    Fe Nanoparticles Using XPS Measurements Under D.C. or Pulsed-Voltage Bias. Analysis of Fe Nanoparticles Using XPS Measurements Under D.C. or Pulsed-Voltage Bias. Abstract: The...

  12. FLORIDIAN NATURAL GAS STORAGE COMPANY, LLC - FE DKT. NO. 15-38...

    Energy Savers [EERE]

    FLORIDIAN NATURAL GAS STORAGE COMPANY, LLC - FE DKT. NO. 15-38-LNG FLORIDIAN NATURAL GAS STORAGE COMPANY, LLC - FE DKT. NO. 15-38-LNG The Office of Fossil Energy gives notice of...

  13. American LNG Marketing LLC - FE Dkt. No. 14-209-LNG | Department...

    Office of Environmental Management (EM)

    American LNG Marketing LLC - FE Dkt. No. 14-209-LNG American LNG Marketing LLC - FE Dkt. No. 14-209-LNG The Office of Fossil Energy gives notice of receipt of an application filed...

  14. Freeport LNG Expansion, L.P. and FLNG Liquefaction, LLC - FE...

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

    Freeport LNG Expansion, L.P. and FLNG Liquefaction, LLC - FE Dkt. No. 11-161-LNG Freeport LNG Expansion, L.P. and FLNG Liquefaction, LLC - FE Dkt. No. 11-161-LNG On November 15,...

  15. SEMI-ANNUAL REPORTS FOR LAKE CHARLES EXPORTS, LLC - FE DKT. NO...

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

    LAKE CHARLES EXPORTS, LLC - FE DKT. NO. 11-59-LNG - ORDER 3324 SEMI-ANNUAL REPORTS FOR LAKE CHARLES EXPORTS, LLC - FE DKT. NO. 11-59-LNG - ORDER 3324 October 2013 April 2014...

  16. Freeport LNG Expansion, L.P. and FLNG Liquefaction, LLC - FE...

    Office of Environmental Management (EM)

    and FLNG Liquefaction, LLC - FE Dkt. No. 10-161-LNG Freeport LNG Expansion, L.P. and FLNG Liquefaction, LLC - FE Dkt. No. 10-161-LNG On May 17, 2013, the Office of Fossil Energy...

  17. SEMI-ANNUAL REPORTS FOR GASFIN DEVELOPMENT USA, LLC - FE DKT...

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

    GASFIN DEVELOPMENT USA, LLC - FE DKT. NO. 13-06-LNG - ORDER 3253 SEMI-ANNUAL REPORTS FOR GASFIN DEVELOPMENT USA, LLC - FE DKT. NO. 13-06-LNG - ORDER 3253 April 2013 October 2013...

  18. SEMI-ANNUAL REPORTS FOR ALASKA LNG PROJECT, LLC - FE DKT NO....

    Office of Environmental Management (EM)

    ALASKA LNG PROJECT, LLC - FE DKT NO. 14-96-LNG - ORDER 3643 (NFTA) SEMI-ANNUAL REPORTS FOR ALASKA LNG PROJECT, LLC - FE DKT NO. 14-96-LNG - ORDER 3643 (NFTA) No reports submitted....

  19. UV spectra of iron-doped carbon clusters FeC_n n = 3-6

    E-Print Network [OSTI]

    Steglich, Mathias; Johnson, Anatoly; Maier, John P

    2015-01-01T23:59:59.000Z

    Electronic transitions of jet-cooled FeC$_n$ clusters ($n = 3 - 6$) were measured between 230 and 300 nm by a mass-resolved 1+1 resonant two-photon ionization technique. Rotational profiles were simulated based on previous calculations of ground state geometries and compared to experimental observations. Reasonable agreement is found for the planar fan-like structure of FeC$_3$. The FeC$_4$ data indicate a shorter distance between the Fe atom and the bent C$_4$ unit of the fan. The transitions are suggested to be $^{3}$A$_{2} \\leftarrow ^{3}$B$_{1}$ for FeC$_3$ and $^{5}$A$_{1} \\leftarrow ^{5}$A$_{1}$ for FeC$_4$. In contrast to the predicted C$_{\\infty \\text{v}}$ geometry, non-linear FeC$_5$ is apparently observed. Line width broadening prevents analysis of the FeC$_6$ spectrum.

  20. Low Temperature Oxidation of Fe2+ Surface Sites on the (2x1)...

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

    Sites on the (2x1) Reconstructed Surface of ?-Fe2O3(01(1) over-bar2). Low Temperature Oxidation of Fe2+ Surface Sites on the (2x1) Reconstructed Surface of...

  1. Magnetism of NiMn2O4-Fe3O4 spinel interfaces

    E-Print Network [OSTI]

    Nelson-Cheeseman, B. B.

    2007-01-01T23:59:59.000Z

    Magnetism of NiMn 2 O 4 –Fe 3 O 4 spinel interfaces B. B.2. Element-specific magnetism of Fe 3 O 4 /NMO interface inin these structures, 6 the magnetism near the isostructural

  2. Carbon-Supported bimetallic Pd-Fe catalysts for vapor-phasehydrodeoxy...

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

    Carbon-Supported bimetallic Pd-Fe catalysts for vapor-phase hydrodeoxygenation of guaiacol. Carbon-Supported bimetallic Pd-Fe catalysts for vapor-phase hydrodeoxygenation of...

  3. A MOSSBAUER STUDY OF AUSTENITE STABILITY AND IMPACT FRACTURE IN Fe - 6 Ni STEEL

    E-Print Network [OSTI]

    Fultz, Brent

    2011-01-01T23:59:59.000Z

    IMPACT FRACTURE IN Fe-6Ni STEEL Brent Thomas Fultz Materialscommercial cryogenic alloy steel was studied with regard toThe Experiments Fe-6Ni-lMn steel plate was received from the

  4. WELDABILITY OF GRAIN-REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS

    E-Print Network [OSTI]

    Morris Jr., J.W.

    2013-01-01T23:59:59.000Z

    of the Cryogenic Nickel Steels, WRC Bull, 205, May, 1975.REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS D.E.REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS D.

  5. The Utility of FeVO4 in Combination with Stabilized Titanias...

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

    The Utility of FeVO4 in Combination with Stabilized Titanias for Mobile SCR Application The Utility of FeVO4 in Combination with Stabilized Titanias for Mobile SCR Application...

  6. Stability of uranium incorporated into Fe(hydr)oxides under fluctuating redox conditions

    E-Print Network [OSTI]

    Stewart, B.D.

    2009-01-01T23:59:59.000Z

    by interaction with goethite, lepidocrocite, muscovite, andM. Reduction of U(VI) in goethite (alpha-FeOOH) suspensionsmM Fe(II) k F=ferrihydrite, G=goethite, L=lepidocrocite, M=

  7. Immobilization of 99-Technetium (VII) by Fe(II)-Goethite and Limited Reoxidation

    E-Print Network [OSTI]

    Um, Wooyong

    2013-01-01T23:59:59.000Z

    of Technetium-99 by Fe(II)-goethite; PNNL- 19833; PacificTransformation of magnetite to goethite under alkaline pHisotope variation among goethite (alpha- FeOOH) and the

  8. JOURNAL DE PHYSIQUE Colloque C2, supplment au n 3, Tome 40, mars 1979, page C2-267 Fe MOSSBAUER STUDIES IN FeCoCr04 AND Fe2 Mo04 CUBIC SPINELS*

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    MOSSBAUER STUDIES IN FeCoCr04 AND Fe2 Mo04 CUBIC SPINELS* M.P. Guptat, S.M.Kanetkartt, S.K. Datettt, ACoCrOi, et FezMoOii, ont été déterminées à l'aide de la spectroscopie Mossbauer et la diffraction des rayons spi- nels, FeCoCrOi, and FeaMoOi, have been determined using Mossbauer and X-ray diffraction

  9. Important role of the non-uniform Fe distribution for the ferromagnetism in group-IV-based ferromagnetic semiconductor GeFe

    SciTech Connect (OSTI)

    Wakabayashi, Yuki K.; Ohya, Shinobu; Ban, Yoshisuke; Tanaka, Masaaki [Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)

    2014-11-07T23:59:59.000Z

    We investigate the growth-temperature dependence of the properties of the group-IV-based ferromagnetic semiconductor Ge{sub 1?x}Fe{sub x} films (x?=?6.5% and 10.5%), and reveal the correlation of the magnetic properties with the lattice constant, Curie temperature (T{sub C}), non-uniformity of Fe atoms, stacking-fault defects, and Fe-atom locations. While T{sub C} strongly depends on the growth temperature, we find a universal relationship between T{sub C} and the lattice constant, which does not depend on the Fe content x. By using the spatially resolved transmission-electron diffractions combined with the energy-dispersive X-ray spectroscopy, we find that the density of the stacking-fault defects and the non-uniformity of the Fe concentration are correlated with T{sub C}. Meanwhile, by using the channeling Rutherford backscattering and particle-induced X-ray emission measurements, we clarify that about 15% of the Fe atoms exist on the tetrahedral interstitial sites in the Ge{sub 0.935}Fe{sub 0.065} lattice and that the substitutional Fe concentration is not correlated with T{sub C}. Considering these results, we conclude that the non-uniformity of the Fe concentration plays an important role in determining the ferromagnetic properties of GeFe.

  10. Beta-decay of Mn-65 to Fe-65

    E-Print Network [OSTI]

    Olaizola, B; Mach, H; Aprahamian, A; Briz, J A; Cal-Gonzalez, J; Ghita, D; Koster, U; Kurcewicz, W; Lesher, S R; Pauwels, D; Picado, E; Poves, A; Radulov, D; Simpson, G S; Udias, J M

    2013-01-01T23:59:59.000Z

    The low energy structure of Fe-65 has been studied by means of gamma- and fast-timing spectroscopy. A level scheme of Fe-65 populated following the beta-decay of Mn-65 was established for the first time. It includes 41 levels and 85 transitions. The excitation energy of the beta-decaying isomer in Fe-65 has been precisely determined at 393.7(2) keV. The beta delayed neutron emission branch was measured as Pn = 7.9(12)%, which cannot be reconciled with the previously reported value of 21.0(5)%. Four gamma-rays and four excited states in Fe-64 were identified as being populated following the beta-n decay. Four lifetimes and five lifetime limits in the subnanosecond range have been measured using the Advanced Time-Delayed Method. The level scheme is compared with shell-model calculations. Tentative spin and parity assignments are proposed based on the observed transition rates, the calculations and the systematics of the region.

  11. Ligand exchange in gold-coated FePt nanoparticles

    E-Print Network [OSTI]

    de la Presa, P; Morales, M P; Hernando, A; 10.1109/TMAG.2008.2002251

    2009-01-01T23:59:59.000Z

    In this work we present the magnetic properties of gold coated FePt nanoparticles and the study of stable aqueous dispersions of FePt@Au and FePt synthesized after ligand exchange with mercaptoundecanoic acid. The particle size determined from TEM micrographs goes from 4 nm for the uncoated nanoparticles to a maximum of 10 nm for the gold coated ones indicating that the thickness of the shell ranges from 1 to 3 nm. The magnetic characterization consists in hysteresis cycles at 10 and 300 K. The results show that, at low field and room temperature, the magnetic behavior of uncoated and coated nanoparticles are surprisingly quite similar. Since the gold coated nanoparticles keep the magnetic properties of FePt and the presence of gold improves the functionalization of nanoparticles, the system is suitable for biological application. Mercaptoundecanoic ligand transfer was used to render water stable nanoparticles in a wide pH range. Transmission electron microscopy and dynamic light scattering results show the n...

  12. Vapor Phase Synthesis and Characterization of -FeSi Nanowires

    E-Print Network [OSTI]

    Heller, Eric

    HF and placed in a horizontal tube furnace, between the center and the downstream end of the alumina tube. Anhydrous FeCl3 powder (Aldrich, 99.99%) was placed in an alumina boat upstream of the substrates. An inert atmosphere was maintained with a flow rate of 100 sccm N2, and the temperature at the center

  13. Spin glass behavior in FeAl2 

    E-Print Network [OSTI]

    Lue, CS; Oner, Y.; Naugle, Donald G.; Ross, JH.

    2001-01-01T23:59:59.000Z

    Magnetic and transport measurements indicate FeAl2 to be an ordered intermetallic spin glass, with canonical behavior including a susceptibility cusp at T-f = 35 K and frequency-dependent susceptibility below T-f. The field-cooled and zero...

  14. Equation of state and phase diagram of FeO

    SciTech Connect (OSTI)

    Fischer, Rebecca A.; Campbell, Andrew J.; Shofner, Gregory A.; Lord, Oliver T.; Dera, Przemyslaw; Prakapenka, Vitali B. (Bristol); (Maryland); (UC)

    2012-04-11T23:59:59.000Z

    Wuestite, Fe{sub 1-x}O, is an important component in the mineralogy of Earth's lower mantle and may also be a component in the core. Therefore the high pressure, high temperature behavior of FeO, including its phase diagram and equation of state, is essential knowledge for understanding the properties and evolution of Earth's deep interior. We performed X-ray diffraction measurements using a laser-heated diamond anvil cell to achieve simultaneous high pressures and temperatures. Wuestite was mixed with iron metal, which served as our pressure standard, under the assumption that negligible oxygen dissolved into the iron. Our data show a positive slope for the subsolidus phase boundary between the B1 and B8 structures, indicating that the B1 phase is stable at the P-T conditions of the lower mantle and core. We have determined the thermal equation of state of B1 FeO to 156 GPa and 3100 K, finding an isothermal bulk modulus K{sub 0} = 149.4 {+-} 1.0 GPa and its pressure derivative K'{sub 0} = 3.60 {+-} 0.4. This implies that 7.7 {+-} 1.1 wt.% oxygen is required in the outer core to match the seismologically-determined density, under the simplifying assumption of a purely Fe-O outer core.

  15. QER- Comment of Sustainable Santa Fe Programs Manager

    Broader source: Energy.gov [DOE]

    At the City of Santa Fe we have had difficulty in getting energy usage data from the investor-owned utility to be able to track progress towards energy use and greenhouse gas reduction goals. It would be helpful if that information were required to be publicly available at the Zip code level. Thanks.

  16. FE-Analysen zur Thermoermdung Test-und Feldzyklen

    E-Print Network [OSTI]

    Berlin,Technische Universität

    LIVE AG 1 -AG 2 FE-Analysen zur Thermoermüdung Test- und Feldzyklen R. Dudek, R. Döring, B #12;LIVE different SAC creep laws: Steady State Creep (after Schubert, SAC405 and Röllig/Wiese SAC xx) Creep properties of SAC 407 show much higher creep resistance than SAC xx SAC 305 bulk averaged values

  17. ELECTRON-CAPTURE SUPERNOVAE AS SOURCES OF {sup 60}Fe

    SciTech Connect (OSTI)

    Wanajo, Shinya [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Janka, Hans-Thomas; Mueller, Bernhard, E-mail: shinya.wanajo@nao.ac.jp [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching (Germany)

    2013-09-01T23:59:59.000Z

    We investigate the nucleosynthesis of the radionuclide {sup 60}Fe in electron-capture supernovae (ECSNe). The nucleosynthetic results are based on a self-consistent, two-dimensional simulation of an ECSN as well as models in which the densities are systematically increased by some factors (low-entropy models). {sup 60}Fe is found to be appreciably made in neutron-rich ejecta during the nuclear quasi-equilibrium phase with greater amounts being produced in the lower-entropy models. Our results, combining them with the yields of core-collapse supernovae in the literature, suggest that ECSNe account for at least 4%-30% of live {sup 60}Fe in the Milky Way. ECSNe co-produce neutron-rich isotopes, {sup 48}Ca, {sup 50}Ti, {sup 54}Cr, some light trans-iron elements, and possibly weak r-process elements including some radionuclides such as {sup 93}Zr, {sup 99}Tc, and {sup 107}Pd, whose association with {sup 60}Fe might have been imprinted in primitive meteorites or in the deep ocean crust on the Earth.

  18. Spin glass behavior in FeAl2

    E-Print Network [OSTI]

    Lue, CS; Oner, Y.; Naugle, Donald G.; Ross, JH.

    2001-01-01T23:59:59.000Z

    Magnetic and transport measurements indicate FeAl2 to be an ordered intermetallic spin glass, with canonical behavior including a susceptibility cusp at T-f = 35 K and frequency-dependent susceptibility below T-f. The field-cooled and zero...

  19. The Effects of Fe3+ Aluminum Silicate Phase Relations in

    E-Print Network [OSTI]

    Lee, Cin-Ty Aeolus

    The Effects of Fe3+ and Mn3+ on Aluminum Silicate Phase Relations in North-Central New Mexico, U, New Mexico 87131 (Received 28 November 1983; in revised form 2 October 1984) ABSTRACT Aluminum, then their equilibrium coexistence is invariant. However, the aluminum silicate minerals are not pure in highly oxidized

  20. High strength-high conductivity Cu--Fe composites produced by powder compaction/mechanical reduction

    DOE Patents [OSTI]

    Verhoeven, John D. (Ames, IA); Spitzig, William A. (Ames, IA); Gibson, Edwin D. (Ames, IA); Anderson, Iver E. (Ames, IA)

    1991-08-27T23:59:59.000Z

    A particulate mixture of Cu and Fe is compacted and mechanically reduced to form an "in-situ" Cu-Fe composite having high strength and high conductivity. Compaction and mechanical reduction of the particulate mixture are carried out at a temperature and time at temperature selected to avoid dissolution of Fe into the Cu matrix particulates to a harmful extent that substantially degrades the conductivity of the Cu-Fe composite.

  1. Structural and Mössbauer spectroscopic study of Fe-Ni alloy nanoparticles

    SciTech Connect (OSTI)

    Kumar, Asheesh; Banerjee, S., E-mail: vsudar@barc.gov.in; Sudarsan, V., E-mail: vsudar@barc.gov.in [Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India); Meena, S. S. [Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India)

    2014-04-24T23:59:59.000Z

    Nano-crystalline Fe-Ni alloys have been synthesized in ethylene glycol medium. Based on XRD studies it is confirmed that, in these alloys Fe atoms are incorporated at Ni site to form Ni-Fe solid solutions. Mössbauer studies have established that for alloy particles having smaller size there is significant concentration of two different types of paramagnetic Fe species and their relative concentration decreased with increase in particle size.

  2. High strength-high conductivity Cu-Fe composites produced by powder compaction/mechanical reduction

    DOE Patents [OSTI]

    Verhoeven, J.D.; Spitzig, W.A.; Gibson, E.D.; Anderson, I.E.

    1991-08-27T23:59:59.000Z

    A particulate mixture of Cu and Fe is compacted and mechanically reduced to form an ''in-situ'' Cu-Fe composite having high strength and high conductivity. Compaction and mechanical reduction of the particulate mixture are carried out at a temperature and time at temperature selected to avoid dissolution of Fe into the Cu matrix particulates to a harmful extent that substantially degrades the conductivity of the Cu-Fe composite. 5 figures.

  3. Adsorption and diffusion energetics of hydrogen atoms on Fe(1 1 0) from first principles

    E-Print Network [OSTI]

    Carter, Emily A.

    as a reactant in Fe-catalyzed ammonia synthesis [1], the Fischer­Tropsch reaction [2] (and many others

  4. Adsorption and dissociation of CO on Fe(110) from first principles

    E-Print Network [OSTI]

    Carter, Emily A.

    catalysis and Fischer­Tropsch synthesis. Fe is used as a catalyst in the Fischer­Tropsch process [1] due

  5. High temperature magnetic properties of SmCo5/-Fe(Co) bulk nanocomposite magnets

    E-Print Network [OSTI]

    Liu, J. Ping

    High temperature magnetic properties of SmCo5/-Fe(Co) bulk nanocomposite magnets Chuanbing Rong://apl.aip.org/about/rights_and_permissions #12;High temperature magnetic properties of SmCo5/a-Fe(Co) bulk nanocomposite magnets Chuanbing Rong,1 containing no heavy rare earths for power applications, SmCo5/Fe bulk nanocomposite magnets with enhanced

  6. SmCo5/Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles

    E-Print Network [OSTI]

    Liu, J. Ping

    SmCo5/Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles Yanglong Hou nanocomposites SmCo5/Fex x=0­2.9 are synthesized by a simultaneous calcium reduction of Sm­Co­O and Fe3O4 nanoparticles. The composites consist of nanostructured SmCo5 and Fe with their average grain sizes at 29 and 8

  7. Reduction of Sintering during Annealing of FePt Nanoparticles Coated with Iron Oxide

    E-Print Network [OSTI]

    Laughlin, David E.

    Reduction of Sintering during Annealing of FePt Nanoparticles Coated with Iron Oxide Chao Liu °C for 30 min at which 2.6-nm FePt nanoparticles without oxide shell coating start to sinter. LowVised Manuscript ReceiVed October 12, 2004 FePt/iron oxide core/shell nanoparticles are synthesized by a two step

  8. OXIDATION MECHANISMS OF LOW ENERGY-HIGH FLUX NITRIDED ODS FeAl INTERMETALLIC ALLOY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    OXIDATION MECHANISMS OF LOW ENERGY-HIGH FLUX NITRIDED ODS FeAl INTERMETALLIC ALLOY F. Pedraza*, J)5.46.45.72.72 Abstract Microscopy studies of low energy-high flux nitrided ODS FeAl Grade 3 intermetallic alloy reveal nitridation treatment at moderate temperature of ODS FeAl Grade 3 has been performed to modify the surface

  9. Hydrogen adsorption on Pd/TiFe (110) surface S.E. Kulkovaa

    E-Print Network [OSTI]

    Kim, Jai Sam

    Hydrogen adsorption on Pd/TiFe (110) surface S.E. Kulkovaa , S.V. Eremeeva,b,*, V.E. Egorushkinc February 2003 by E.L. Ivchenko Abstract Adsorption of hydrogen on the TiFe (110) surface covered the local density approximation. Influence of palladium coating to adsorption properties of the TiFe (110

  10. Combined Microbial-Fe(0) Treatment Systems 1 1058-8337/00/$.50

    E-Print Network [OSTI]

    Alvarez, Pedro J.

    produces cathodic H2 when corroded by water. The preferential colonization of Fe(0) suggests- valent iron (Fe(0)) is submerged in anoxic water, hydro- gen gas is produced via cathodic depolarizationCombined Microbial-Fe(0) Treatment Systems 1 1058-8337/00/$.50 © 2000 by Battelle Memorial

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

    E-Print Network [OSTI]

    Hwang, S.

    2010-01-01T23:59:59.000Z

    3, 1976 LBL-5401 l NICKEL-FREE Fe-12Mn-O. 2Ti ALLOY STEELowned rights. I v LBL-540l NICKEL-FREE Fe-12Mn-0.2Ti ALLOY94720 USA ABSTRACT A nickel-free Fe-12Mn-0.2Ti alloy steel

  12. High-pressure phases of FeTiO3 from first principles N. C. Wilson

    E-Print Network [OSTI]

    2005; published 19 July 2005 The structural, elastic, and electronic properties of the high-pressure Fe and their interaction with the structural degrees of freedom. Ilmenite, the mineral form of FeTiO3, is commonly found of diamond deposits.2 In addition to ilmenite, two other polymorphs of FeTiO3 are known,3 namely, the lithium

  13. Emitting gas regions in Mrk 493: An extensive Fe II line emission region

    E-Print Network [OSTI]

    L. C. Popovic; A. Smirnova; D. Ilic; A. Moiseev; J. Kovacevic; V. Afanasiev

    2007-01-24T23:59:59.000Z

    We performed 3D spectroscopic observations of Mrk 493 in order to investigate the Fe II emitting region and their possible connection with the Hydrogen emitting region. We found that there is a strong Fe II emission in an extensive region ~ 4" x 4" around Sy 1 nucleus. The Fe II line width indicates that these lines are originated in an intermediate line region.

  14. Temperature dependence of magnetoelastic properties of Fe100?xSix (5 < x < 20)

    SciTech Connect (OSTI)

    Petculescu, G.; Lambert, P.K.; Clark, A.E.; Hathaway, K.B.; Xing, Qingfeng; Lograsso, Tom; Restorff, J.B.; Wun-Fogle, M.

    2012-02-29T23:59:59.000Z

    Tetragonal magnetostriction (??,2) and elastic constants (c?, c44, and c11) for Fe100?xSix were measured as a function of temperature (T). Compositions corresponding to the disordered A2 (x?=?5), ordered D03 (x?=?19.8), and mixed (x?=?11.6) phases, were investigated. The magnetoelastic coupling (?b1) was determined for 77 < T < 300?K and compared with those of Fe-Ga, Fe-Ge, and Fe-Al. Both ??,2(T) and ?b1(T) of Fe-Si behave similarly to those of Fe-Ge, while other notable differences exist between the measured properties of Fe-Si and those of the other three alloys. Due to the early establishment of short range order, Fe-Si exhibits a positive, although small, slope in ??,2(T) at 5 at. % Si, and a remarkable drop in ?b1 before the solubility limit. The weaker softening of the tetragonal shear modulus with the addition of Si and the lack of strong anharmonic effects in the Fe-Si lattice inferred from the weak T-dependence of all the moduli suggest that Fe-Si exhibits more structural stability than the other three alloys. The distinctive behavior is likely due to the smaller size of Si compared to the sizes of Ga, Ge and Al, and therefore to the effect of the larger size difference between Fe and Si in the Fe-Si lattice.

  15. A synthesis of LiFePO{sub 4} starting from FePO{sub 4} under reducing atmosphere

    SciTech Connect (OSTI)

    Prosini, Pier Paolo [ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Centre, Via Anguillarese 301, 00123 Santa Maria di Galeria, Rome, Italy and DInESto, Drive the Innovation in Energy Storage, Via Provin (Italy); Cento, Cinzia; Masci, Amedeo; Carewska, Maria; Gislon, Paola [ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Centre, Via Anguillarese 301, 00123 Santa Maria di Galeria, Rome (Italy)

    2014-06-19T23:59:59.000Z

    A fast and easy way to produce LiFePO{sub 4} starting from FePO{sub 4}, used as iron and phosphorus source, is proposed. 5% hydrogen is employed as a reducing agent and various compounds containing lithium as lithiation agents. The selected lithiation agents included: LiCl, CH{sub 3}COOLi, LiOH, Li{sub 2}S, LiH, and Li{sub 2}CO{sub 3}. Solid state synthesis is used for the LiFePO{sub 4} preparation and the so obtained materials are structurally characterized by XRD. The materials are used to fabricate composite electrode and their specific capacity is evaluated by low rate galvanostatic charge/discharge cycles (C/10 rate). Among the various lithium salts, the acetate give rise to the LiFePO{sub 4} with the best electrochemical performance. The morphology of this material is further investigated by SEM microscopy and the specific capacity is evaluated as a function of the discharge rate and the cycle number.

  16. Identification of an incommensurate FeAl{sub 2} overlayer on FeAl(110) using x-ray diffraction and reflectivity

    SciTech Connect (OSTI)

    Baddorf, A.P. [Oak Ridge National Lab., TN (United States); Chandavarkar, S.S. [Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy

    1995-06-30T23:59:59.000Z

    FeAl, like NiAl, crystallizes in the CsCl structure. Consequently the (110) planes contain equal amounts of Fe and Al distributed as interlocking rectangles. Unlike the NiAI(110) surface, which retains the (1{times}l) in-plane symmetry of the bulk, FeAl(l10) reconstructs to form an ordered, incommensurate overlayer. The reconstructed layer introduces x-ray diffraction rods at half-order positions along the [1{bar 1}0] direction, and displaced {plus_minus}0.2905 from integer positions along the [001] direction. Peak widths reveal excellent long range order. Specular reflectivity measurements above and below the Fe K{alpha} edge can be reproduced using a model containing a single reconstructed overlayer with an Fe:Al ratio of 1:2, consistent with FeA{sub I}2.

  17. g factor of the first excited state in {sup 56}Fe and implications for transient-field calibration in the Fe region

    SciTech Connect (OSTI)

    East, M. C.; Stuchbery, A. E.; Chamoli, S. K.; Kibedi, T. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University Canberra, ACT 0200 (Australia); Wilson, A. N. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University Canberra, ACT 0200 (Australia); Department of Physics, Australian National University, Canberra, ACT 0200 (Australia); Crawford, H. L.; Pinter, J. S.; Mantica, P. F. [NSCL and Department of Chemistry, Michigan State University, Michigan 48824 (United States)

    2009-02-15T23:59:59.000Z

    The transient-field technique has been used to measure the g factor of the 2{sub 1}{sup +} state in {sup 56}Fe relative to the independently determined g factor of the first 5/2{sup -} state in {sup 57}Fe. The new result for {sup 56}Fe agrees with previous measurements but is more precise. Implications for calibrating the transient field and g-factor measurements in the fp region are discussed.

  18. 0 1 2 3 4 5 Fig. S1. Core photograph combined with Ca, Mn, Fe counts and Mn/Fe ratio determined by XRF core

    E-Print Network [OSTI]

    Gilli, Adrian

    1. Core photograph combined with Ca, Mn, Fe counts and Mn/Fe ratio determined by XRF core scanning determined by XRF core scanning on core ZH10-19 from Lake Zurich recovered in 135 m water depth (2 m above counts and Mn/Fe ratio determined by XRF core scanning on core ZH10-21 from Lake Zurich recovered in 123

  19. Iron silicide formation at different layers of (Fe/Si){sub 3} multilayered structures determined by conversion electron Mössbauer spectroscopy

    SciTech Connect (OSTI)

    Badía-Romano, L., E-mail: lbadia@unizar.es; Bartolomé, J. [Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, E-50009 Zaragoza (Spain); Rubín, J. [Departamento de Ciencia y Tecnología de Materiales y Fluidos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, E-50018 Zaragoza (Spain); Magén, C. [Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, E-50018 Zaragoza (Spain); Bürgler, D. E. [Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich (Germany)

    2014-07-14T23:59:59.000Z

    The morphology and the quantitative composition of the Fe-Si interface layer forming at each Fe layer of a (Fe/Si){sub 3} multilayer have been determined by means of conversion electron Mössbauer spectroscopy (CEMS) and high-resolution transmission electron microscopy (HRTEM). For the CEMS measurements, each layer was selected by depositing the Mössbauer active {sup 57}Fe isotope with 95% enrichment. Samples with Fe layers of nominal thickness d{sub Fe}?=?2.6?nm and Si spacers of d{sub Si}?=?1.5?nm were prepared by thermal evaporation onto a GaAs(001) substrate with an intermediate Ag(001) buffer layer. HRTEM images showed that Si layers grow amorphous and the epitaxial growth of the Fe is good only for the first deposited layer. The CEMS spectra show that at all Fe/Si and Si/Fe interfaces a paramagnetic c-Fe{sub 1?x}Si phase is formed, which contains 16% of the nominal Fe deposited in the Fe layer. The bottom Fe layer, which is in contact with the Ag buffer, also contains ?-Fe and an Fe{sub 1?x}Si{sub x} alloy that cannot be attributed to a single phase. In contrast, the other two layers only comprise an Fe{sub 1?x}Si{sub x} alloy with a Si concentration of ?0.15, but no ?-Fe.

  20. Interface magnetism of Co{sub 2}FeGe Heusler alloy layers and magnetoresistance of Co{sub 2}FeGe/MgO/Fe magnetic tunnel junctions

    SciTech Connect (OSTI)

    Tanaka, M. A., E-mail: mtanaka@nitech.ac.jp; Maezaki, D.; Ishii, T.; Okubo, A.; Mibu, K. [Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Nagoya, Aichi 466-8555 (Japan); Hiramatsu, R.; Ono, T. [Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)

    2014-10-28T23:59:59.000Z

    The interface magnetism between Co{sub 2}FeGe Heusler alloy layers and MgO layers was investigated using {sup 57}Fe Mössbauer spectroscopy. Interface-sensitive samples, where the {sup 57}Fe isotope was used only for the interfacial atomic layer of the Co{sub 2}FeGe layer on the MgO layer, were prepared using atomically controlled alternate deposition. The {sup 57}Fe Mössbauer spectra of the interface-sensitive samples at room temperature were found similar to those of the bulk-sensitive Co{sub 2}FeGe films in which the {sup 57}Fe isotope was distributed throughout the films. On the other hand, the tunnel magnetoresistance effect of magnetic tunnel junctions with Co{sub 2}FeGe layers as the ferromagnetic electrodes showed strong reduction at room temperature. These results indicate that the strong temperature dependence of the tunneling magnetoresistance of magnetic tunnel junctions using Heusler alloy electrodes cannot be attributed simply to the reduction of the magnetization at the interfaces between the Heusler alloy and insulator layers.

  1. First analysis of eight Algol-type systems: V537 And, GS Boo, AM CrB, V1298 Her, EL Lyn, FW Per, RU Tri, and WW Tri

    E-Print Network [OSTI]

    Zasche, P

    2014-01-01T23:59:59.000Z

    Analyzing available photometry from the Super WASP and other databases, we performed the very first light curve analysis of eight eclipsing binary systems V537 And, GS Boo, AM CrB, V1298 Her, EL Lyn, FW Per, RU Tri, and WW Tri. All of these systems were found to be detached ones of Algol-type, having the orbital periods of the order of days. 722 new times of minima for these binaries were derived and presented, trying to identify the period variations caused by the third bodies in these systems.

  2. Oxide shell reduction and magnetic property changes in core-shell Fe nanoclusters under ion irradiation

    SciTech Connect (OSTI)

    Sundararajan, Jennifer A.; Kaur, Maninder; Qiang, You, E-mail: youqiang@uidaho.edu [Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States); Jiang, Weilin [Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352 (United States); McCloy, John S. [School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164 (United States)

    2014-05-07T23:59:59.000Z

    Ion irradiation effects are studied on the Fe-based core-shell nanocluster (NC) films with core as Fe and shell as Fe{sub 3}O{sub 4}/Fe{sub 3}N. These NC films were deposited on Si substrates to thickness of ?0.5 ?m using a NC deposition system. The films were irradiated at room temperature with 5.5?MeV Si{sup 2+} ions to ion fluences of 10{sup 15} and 10{sup 16} ions/cm{sup 2}. It is found that the irradiation induces grain growth, Fe valence reduction in the shell, and crystallization or growth of Fe{sub 3}N. The film retained its Fe-core and its ferromagnetic properties after irradiation. The nature and mechanism of oxide shell reduction and composition dependence after irradiation were studied by synthesizing additional NC films of Fe{sub 3}O{sub 4} and FeO?+?Fe{sub 3}N and irradiating them under the same conditions. The presence of nanocrystalline Fe is found to be a major factor for the oxide shell reduction. The surface morphologies of these films show dramatic changes in the microstructures due to cluster growth and agglomeration as a result of ion irradiation.

  3. Morphology and crystallographic orientation relationship in isothermally transformed Fe–N austenite

    SciTech Connect (OSTI)

    Jiao, Dongling, E-mail: dljiao@scut.edu.cn [School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640 (China); Luo, Chengping; Liu, Jiangwen [School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640 (China); Zhang, Guoqing [Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095 (China)

    2014-02-15T23:59:59.000Z

    The 225 °C isothermal transformation of a high-nitrogen austenite with Fe–2.71 wt.% N was investigated by means of electron microscopy. It was found that the transformation products were composed of ultrafine ?-Fe and ??-Fe{sub 4}N plus retained austenite ?, which were in two types of morphologies, namely, (i) with the retained austenite patches dispersed among the (?-Fe + ??-Fe{sub 4}N) packets and (ii) with the ultrafine ?-Fe and ?/??-Fe{sub 4}N laths interwoven with each other within a single bainitic packet. A cube–cube orientation relationship between the ? (austenite) and ??-Fe{sub 4}N, and a near Greninger–Troiano (G–T) one between the ? (austenite) and the bainitic ?-ferrite were detected. The morphology, orientation relationship and high hardness (> 1000 HV) of the transformation products indicated that the isothermal transformation of the high nitrogen austenite was analogous to a bainitic one. - Highlights: • Isothermal transformation products consisted of nano-sized ?-Fe + ?? + ? (retained). • The hardness of transformation product exceeded 1000 HV. • The ?-Fe and ?/??-Fe{sub 4}N kept a near G-T OR in the grain interior.

  4. Synthesis of Monodisperse FeCo Nanoparticles by Reductive Salt-Matrix Annealing

    SciTech Connect (OSTI)

    Poudyal, Narayan; Chaubey, Girija S.; Rong, Chuan-bing; Cui, Jun; Liu, J.Ping

    2013-08-02T23:59:59.000Z

    We report here a novel synthetic method to prepare monodisperse air-stable FeCo nanoparticles. CoFe2O4 nanoparticles with different sizes were first synthesized by a chemical solution method. The as-synthesized CoFe2O4 nanoparticles were then mixed with ball-milled NaCl powders and heated to 400–500oC in forming gas (Ar 93% + H2 7%). The salt powder worked as a separating medium that prevents the CoFe2O4 nanoparticles from agglomerating during the heat treatment while the forming gas reduces the CoFe2O4 nanoparticles to FeCo nanoparticles. Monodisperse FeCo nanoparticles were recovered by dissolving the NaCl in water and subsequently washing with ethanol and acetone. Structural analyses confirmed that FeCo nanoparticles retained the same size as their oxide precursors. The size of the FeCo nanoparticles can be well tuned by controlling the size of the CoFe2O4 nanoparticles. The saturation magnetization of FeCo nanoparticles is size dependent and increases with size.

  5. Improved gas sensing and dielectric properties of Fe doped hydroxyapatite thick films: Effect of molar concentrations

    SciTech Connect (OSTI)

    Mene, Ravindra U. [PDEA's, Annasaheb Waghire College of Science, Arts and Commerce, Otur 412409, M.S. (India); School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, M.S. (India); Mahabole, Megha P. [School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, M.S. (India); Mohite, K.C. [Haribhai. V. Desai College, Pune 411002, M.S. (India); Khairnar, Rajendra S., E-mail: rskhairnarsps@gmail.com [School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, M.S. (India)

    2014-02-01T23:59:59.000Z

    Highlights: • We report improved gas sensing and dielectric characteristics of Fe ion exchanged HAp films. • Fe doped HAp film shows maximum gas response at relatively lower temperature. • Response and gas uptake capacity of sensors is improved for appropriate amount of Fe ions in HAp matrix. • Fe-HAp films exhibit remarkable improvement in dielectric properties compared to pure HAp. • Fe doped HAp films show significant improvement in gas sensing as well as in dielectric properties. - Abstract: In the present work Fe doped hydroxyapatite (Fe-HAp) thick films has been successfully utilized to improve the gas sensing as well as its dielectric properties. Initially, HAp nano powder is synthesized by chemical precipitation process and later on Fe ions are doped in HAp by ion exchange process. Structural and morphological modifications are observed by means of X-ray diffraction and scanning electron microscopy analysis. The sensing parameters such as operating temperature, response/recovery time and gas uptake capacity are experimentally determined. The Fe-HAp (0.05 M) film shows improved CO and CO{sub 2} gas sensing capacity at lower operating temperature compared to pure HAp. Moreover, variation of dielectric constant and dielectric loss for pure and Fe-HAp thick films are studied as a function of frequency in the range of 10 Hz–1 MHz. The study reveals that Fe doped HAp thick films improve the sensing and dielectric characteristics as compared to pure HAp.

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

    SciTech Connect (OSTI)

    Motta, A. T.

    1998-01-29T23:59:59.000Z

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

  7. The passivation of calcite by acid mine water. Column experiments with Fe(III)- SO4-H+ and Fe(III)-Cl-H+ solutions at pH 2

    E-Print Network [OSTI]

    Boi, Marco

    2010-01-01T23:59:59.000Z

    2 (e) (a) t / tau Fe (ppm) mg Fe / g CaCO3 Fe (ppm) (b) t /tau mg Fe / g CaCO3 SO4 or Cl (eq/kg H2O) SO4 or Cl (eq/kg

  8. Exchange bias in Fe/Cr double superlattices.

    SciTech Connect (OSTI)

    Jiang, J. S.; Felcher, G. P.; Inomata, A.; Goyette, R.; Nelson, C.; Bader, S. D.

    1999-11-30T23:59:59.000Z

    Utilizing the oscillatory interlayer exchange coupling in Fe/Cr superlattices, we have constructed ''double superlattice'' structures where a ferromagnetic (F) and an antiferromagnetic (AF) Fe/Cr superlattice are coupled through a Cr spacer. The minor hysteresis loops in the magnetization are shifted from zero field, i.e., the F superlattice is exchange biased by the AF one. The double superlattices are sputter-deposited with (211) epitaxy and possess uniaxial in-plane magnetic anisotropy. The magnitude of the bias field is satisfactorily described by the classic formula for collinear spin structures. The coherent structure and insensitivity to atomic-scale roughness makes it possible to determine the spin distribution by polarized neutron reflectivity, which confirms that the spin structure is collinear. The magnetic reversal behavior of the double superlattices suggests that a realistic model of exchange bias needs to address the process of nucleating local reverse domains.

  9. Kinetics of Fe(III)*EDTA reduction by ascorbic acid

    SciTech Connect (OSTI)

    Li, W.; Harkness, J.B.L.; Mendelsohn, M.H.

    1992-12-01T23:59:59.000Z

    The kinetics of the reduction of ferric chelate by ascorbic acid have been determined at a typical flue-gas scrubber-system operating temperature ({approximately}55{degrees}C). The ascorbic acid reaction has the same reduction rate expression as the reduction by bisulfite ions, namely, first order with respect to the concentrations of both Fe(III)*EDTA and monoionic species of ascorbic acid. The reaction rate isnegative first order with respect to Fe(II)*EDTA concentration. In the pH range of 6--8, reduction of the hydrolyzed form of the metal chelate compound was negligible. The rate constant for the ascorbic acid reduction reaction is almost 400 times larger than that for the bisulfite reduction reaction under the same reaction conditions. There was no contribution associated with the nonionized form of ascorbic acid.

  10. Kinetics of Fe(III)*EDTA reduction by ascorbic acid

    SciTech Connect (OSTI)

    Li, W.; Harkness, J.B.L.; Mendelsohn, M.H.

    1992-01-01T23:59:59.000Z

    The kinetics of the reduction of ferric chelate by ascorbic acid have been determined at a typical flue-gas scrubber-system operating temperature ([approximately]55[degrees]C). The ascorbic acid reaction has the same reduction rate expression as the reduction by bisulfite ions, namely, first order with respect to the concentrations of both Fe(III)*EDTA and monoionic species of ascorbic acid. The reaction rate isnegative first order with respect to Fe(II)*EDTA concentration. In the pH range of 6--8, reduction of the hydrolyzed form of the metal chelate compound was negligible. The rate constant for the ascorbic acid reduction reaction is almost 400 times larger than that for the bisulfite reduction reaction under the same reaction conditions. There was no contribution associated with the nonionized form of ascorbic acid.

  11. Effect of tungsten addition on the toughness and hardness of Fe{sub 2}B in wear-resistant Fe-B-C cast alloy

    SciTech Connect (OSTI)

    Huang, Zhifu, E-mail: hzf@mail.xjtu.edu.cn; Xing, Jiandong; Lv, Liangliang

    2013-01-15T23:59:59.000Z

    The effects of tungsten additions of 0%, 1.12%, 2.04%, and 3.17% (in wt.%) on the morphology, fracture toughness and micro-hardness of Fe{sub 2}B in Fe-B-C cast alloy were investigated. The results indicate that, with the increase of tungsten addition, the morphology and distribution of Fe{sub 2}B have no change and a new W-containing phase, except the (Fe, W){sub 2}B with a certain tungsten solution, does not form, and that the fracture toughness of Fe{sub 2}B increases first and then decreases, while the hardness increases first and then has a little change. Compared with the fracture toughness (3.8 MPa{center_dot}m{sup 1/2}) of Fe{sub 2}B without tungsten addition, the toughness at 2.04 wt.% tungsten can be improved by about above 80% and achieves about 6.9 MPa{center_dot}m{sup 1/2}, and variation characteristics of hardness and toughness of Fe{sub 2}B were also testified by viewing the indentation marks and cracks on the Fe{sub 2}B, respectively. - Highlights: Black-Right-Pointing-Pointer Poor toughness of Fe2B decreases obviously the wear resistance of the alloy. Black-Right-Pointing-Pointer As W content increases, Fe2B's toughness increases first and then decreases. Black-Right-Pointing-Pointer As W content increases, Fe2B's hardness first increases and then has little change. Black-Right-Pointing-Pointer The toughness at 2.04 % W can be improved by above 80% more than that at 0% W.

  12. Average Fe K-alpha emission from distant AGN

    E-Print Network [OSTI]

    A. Corral; M. J. Page; F. J. Carrera; X. Barcons; S. Mateos; J. Ebrero; M. Krumpe; A. Schwope; J. A. Tedds; M. G. Watson

    2008-10-02T23:59:59.000Z

    One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape of broad relativistic Fe lines seen in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to measure the mean Fe emission properties of AGN at different depths with very different results. We compute the mean Fe emission from a large and representative sample of AGN X-ray spectra up to redshift ~ 3.5. We developed a method of computing the rest-frame X-ray average spectrum and applied it to a large sample (more than 600 objects) of type 1 AGN from two complementary medium sensitivity surveys based on XMM-Newton data, the AXIS and XWAS samples. This method makes use of medium-to-low quality spectra without needing to fit complex models to the individual spectra but with computing a mean spectrum for the whole sample. Extensive quality tests were performed by comparing real to simulated data, and a significance for the detection of any feature over an underlying continuum was derived. We detect with a 99.9% significance an unresolved Fe K-alpha emission line around 6.4 keV with an EW ~ 90 eV, but we find no compelling evidence of any significant broad relativistic emission line in the final average spectrum. Deviations from a power law around the narrow line are best represented by a reflection component arising from cold or low-ionization material. We estimate an upper limit for the EW of any relativistic line of 400 eV at a 3 sigma confidence level. We also marginally detect the so-called Iwasawa-Taniguchi effect on the EW for the unresolved emission line, which appears weaker for higher luminosity AGN.

  13. Santa Fe Community College offers new welding program

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementingnpitcheResearch Briefs TheSanket A. Deshmukh ArgonneSanta Fe

  14. Average Fe K-alpha emission from distant AGN

    E-Print Network [OSTI]

    Corral, A; Carrera, F J; Barcons, X; Mateos, S; Ebrero, J; Krumpe, M; Schwope, A; Tedds, J A; Watson, M G

    2008-01-01T23:59:59.000Z

    One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape of broad relativistic Fe lines seen in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to measure the mean Fe emission properties of AGN at different depths with very different results. We compute the mean Fe emission from a large and representative sample of AGN X-ray spectra up to redshift ~ 3.5. We developed a method of computing the rest-frame X-ray average spectrum and applied it to a large sample (more than 600 objects) of type 1 AGN from two complementary medium sensitivity surveys based on XMM-Newton data, the AXIS and XWAS samples. This method makes use of medium-to-low quality spectra without needing to fit complex models to the individual spectra but with computing a mean spectrum for the whole sample. Extensive quality tests were performed by comparing real to simulated data, a...

  15. Magnetoelectric nano-Fe3O4?CoFe2O4?PbZr0.53Ti0.47O3 composite

    E-Print Network [OSTI]

    Ren, Shenqiang; Wuttig, Manfred

    2008-02-26T23:59:59.000Z

    A new magnetoelectric hybrid device composed of a nanoparticulate magnetostrictive iron oxide-cobalt ferritefilm on a piezoelectric lead zirconic titanate crystal serving as both substrate and straining medium is described. Nano-Fe3O4?CoFe2O4...

  16. Focus on superconductivity in Fe-based systems

    SciTech Connect (OSTI)

    Prozorov, Ruslan; Chubukov, Andrey; Meingast, Christoph; Putti, Marina

    2012-08-03T23:59:59.000Z

    The past four years of incredibly intense research into Fe-based superconductors have brought about many unexpected surprises. Our understanding of their behavior and physical properties is constantly evolving. Unlike any other superconductors, those containing iron span diverse groups of materials: pnictides, chalcogenides, intermetallics and oxides. Some major properties of the materials are quite similar, yet each group has its own distinct features. Significant effort has been put into identifying new superconducting compositions, modifying the existing ones with new dopants and treatments, and producing single crystals, thin films, wires and polycrystalline bulk material. A wide array of experimental techniques was applied to study Fe-based superconductors and the result is a tremendous amount of data collected over a period of less than four years. Theoretical debates are still lively, and there is an ongoing search for possible universalities and commonalities with other unconventional superconductors, like high-Tc cuprates or heavy fermion materials. The three-dimensional electronic structures of Fe-based superconductors, as well as their extreme sensitivity to disorder, present serious challenges for both theoretical analysis and the interpretation of experiments. However, some key properties emerge from multiple studies. Unconventional, multiband superconductivity originating from an electronic mechanism has found both experimental and theoretical support. There has been great progress in the understanding of various anisotropies of superconducting gap structures, including the possibility of gap nodes even if the gap symmetry is s-wave. Similar to high-Tc cuprates, the superconducting phase has a dome-like shape on T-doping or T-pressure phase diagrams. The anisotropy of the superconducting gap evolves with doping and is likely to become stronger at the dome's edge. In many Fe-based superconductors there is a range where superconductivity coexists and competes with long-range magnetic order, and magnetic fluctuations are considered by some to be of the utmost importance for the pairing mechanism. Others argue that orbital fluctuations, possibly in combination with phonons, are crucial for the pairing. Fe-based superconductors show extremely large upper critical fields and relatively low electronic anisotropy, which are crucial aspects for power applications. The expectations are high, though it remains unclear what maximal current densities can be supported by a properly designed bulk material with optimal pinning centers. This focus issue of Superconductor Science and Technology is a snapshot of some of the recent progress in materials preparation, experiments and theory. It includes articles on the search for new Fe-based superconductors and on the search for superconductivity at extreme conditions. Particular attention is devoted to: the effects of chemical substitutions; the development of thin films; the introduction of artificial defects to increase critical current density; and a general analysis of vortex physics. The articles on fundamental aspects of superconductivity include: the discussion of various experimental problems; an in-depth analysis of the nodal and nodeless pairing states; the discussion of the pairing mechanism; and the effects of pair-breaking due to disorder. Also discussed are nematic correlations and the coexistence of magnetism and superconductivity. The papers collected in this issue present a detailed review of the accomplishments of the last four years of research into Fe-based superconductors, up to and including last-minute developments. We hope that this combination will make this special section of Superconductor Science and Technology both interesting and useful to a broad spectrum of physicists and materials scientists.

  17. Isolation and microbial reduction of Fe(III) phyllosilicates from subsurface sediments

    SciTech Connect (OSTI)

    Wu, Tao; Shelobolina, Evgenya S.; Xu, Huifang; Konishi, Hiromi; Kukkadapu, Ravi K.; Roden, Eric E.

    2012-10-12T23:59:59.000Z

    Fe(III)-bearing phyllosilicates can be important sources of Fe(III) for dissimilatory microbial iron reduction in clay-rich anoxic soils and sediments. The goal of this research was to isolate Fe(III) phyllosilicate phases, and if possible, Fe(III) oxide phases, from a weathered shale saprolite sediment in order to permit experimentation with each phase in isolation. Physical partitioning by density gradient centrifugation did not adequately separate phyllosilicate and Fe(III) oxide phases (primarily nanoparticulate goethite). Hence we examined the ability of chemical extraction methods to remove Fe(III) oxides without significantly altering the properties of the phyllosilicates. XRD analysis showed that extraction with oxalate alone or oxalate in the presence of added Fe(II) altered the structure of Fe-bearing phyllosilicates in the saprolite. In contrast, citrate-bicarbonate-dithionite (CBD) extraction at room temperature and 80C led to minimal alteration of phyllosilicate structures. Reoxidation of CDB-extracted sediment with H2O2 restored phyllosilicate structure (i.e. d-spacing) and redox speciation to conditions similar to that in the pristine sediment. The extent of microbial (Geobacter sulfurreducens) reduction of Fe(III) phyllosilicates isolated by CDB extraction (ca. 16 %) was comparable to what took place in pristine sediments as determined by Mossbauer spectroscopy (ca. 18 % reduction). These results suggest that materials isolated by CDB extraction and H2O2 reoxidation are appropriate targets for detailed studies of natural soil/sediment Fe(III) phyllosilicate reduction.

  18. First principles study of Fe in diamond: A diamond-based half metallic dilute magnetic semiconductor

    SciTech Connect (OSTI)

    Benecha, E. M. [Department of Physics, University of South Africa, P.O. Box 392, UNISA 0003 Pretoria (South Africa); Lombardi, E. B., E-mail: lombaeb@unisa.ac.za [College of Graduate Studies, University of South Africa, P.O. Box 392, UNISA 0003 Pretoria (South Africa)

    2013-12-14T23:59:59.000Z

    Half-metallic ferromagnetic ordering in semiconductors, essential in the emerging field of spintronics for injection and transport of highly spin polarised currents, has up to now been considered mainly in III–V and II–VI materials. However, low Curie temperatures have limited implementation in room temperature device applications. We report ab initio Density Functional Theory calculations on the properties of Fe in diamond, considering the effects of lattice site, charge state, and Fermi level position. We show that the lattice sites and induced magnetic moments of Fe in diamond depend strongly on the Fermi level position and type of diamond co-doping, with Fe being energetically most favorable at the substitutional site in p-type and intrinsic diamond, while it is most stable at a divacancy site in n-type diamond. Fe induces spin polarized bands in the band gap, with strong hybridization between Fe-3d and C-2s,2p bands. We further consider Fe-Fe spin interactions in diamond and show that substitutional Fe{sup +1} in p-type diamond exhibits a half-metallic character, with a magnetic moment of 1.0??{sub B} per Fe atom and a large ferromagnetic stabilization energy of 33?meV, an order of magnitude larger than in other semiconductors, with correspondingly high Curie temperatures. These results, combined with diamond's unique properties, demonstrate that Fe doped p-type diamond is likely to be a highly suitable candidate material for spintronics applications.

  19. Towards tailoring the magnetocaloric response in FeRh-based ternary compounds

    SciTech Connect (OSTI)

    Barua, Radhika, E-mail: barua.r@husky.neu.edu; Jiménez-Villacorta, Félix; Lewis, L. H. [Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)

    2014-05-07T23:59:59.000Z

    In this work, we demonstrate that the magnetocaloric response of FeRh-based compounds may be tailored for potential magnetic refrigeration applications by chemical modification of the FeRh lattice. Alloys of composition Fe(Rh{sub 1?x}A{sub x}) or (Fe{sub 1?x}B{sub x})Rh (A?=?Cu, Pd; B?=?Ni; 0?FeRh-based systems were determined using isothermal M(H) curves measured in the vicinity of the magnetostructural temperature (T{sub t}). It is found that the FeRh working temperature range (?T{sub FWHM}) may be chemically tuned over a wide temperature range, 100?K???T???400?K. While elemental substitution consistently decreases the magnetic entropy change (?S{sub mag}) of the FeRh-based ternary alloys from that of the parent FeRh compound (?S{sub mag},{sub FeRh}???17?J/kg?K; ?S{sub mag,FeRh-ternary?=}?7–14?J/kg?K at H{sub app}?=?2?T), the net refrigeration capacity (RC), defined as the amount of heat that can be transferred during one magnetic refrigeration cycle, of the modified systems is significantly higher (RC{sub FeRh}???150?J/kg; RC{sub FeRh-ternary?=}?170–210?J/kg at H{sub app}?=?2?T). These results are attributed to stoichiometry-induced changes in the FeRh electronic band structure and beneficial broadening of the magnetostructural transition due to local chemical disorder.

  20. STORAGE RING CROSS SECTION MEASUREMENTS FOR ELECTRON IMPACT SINGLE AND DOUBLE IONIZATION OF Fe{sup 13+} AND SINGLE IONIZATION OF Fe{sup 16+} AND Fe{sup 17+}

    SciTech Connect (OSTI)

    Hahn, M.; Novotny, O.; Savin, D. W. [Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027 (United States)] [Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027 (United States); Becker, A.; Grieser, M.; Krantz, C.; Repnow, R.; Wolf, A. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany)] [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Bernhardt, D.; Mueller, A.; Schippers, S.; Spruck, K. [Institut fuer Atom- und Molekuelphysik, Justus-Liebig-Universitaet Giessen, Leihgesterner Weg 217, D-35392 Giessen (Germany)] [Institut fuer Atom- und Molekuelphysik, Justus-Liebig-Universitaet Giessen, Leihgesterner Weg 217, D-35392 Giessen (Germany); Lestinsky, M. [GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany)] [GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany)

    2013-04-10T23:59:59.000Z

    We report measurements of electron impact ionization for Fe{sup 13+}, Fe{sup 16+}, and Fe{sup 17+} over collision energies from below threshold to above 3000 eV. The ions were recirculated using an ion storage ring. Data were collected after a sufficiently long time that essentially all the ions had relaxed radiatively to their ground state. For single ionization of Fe{sup 13+}, we find that previous single pass experiments are more than 40% larger than our results. Compared to our work, the theoretical cross section recommended by Arnaud and Raymond is more than 30% larger, while that of Dere is about 20% greater. Much of the discrepancy with Dere is due to the theory overestimating the contribution of excitation-autoionization via n = 2 excitations. Double ionization of Fe{sup 13+} is dominated by direct ionization of an inner shell electron accompanied by autoionization of a second electron. Our results for single ionization of Fe{sup 16+} and Fe{sup 17+} agree with theoretical calculations to within the experimental uncertainties.

  1. Refined model of the {Fe9} magnetic molecule from low-temperature inelastic neutron scattering studies

    SciTech Connect (OSTI)

    Engelhardt, Larry [Francis Marion University; Demmel, Franz [Rutherford Appleton Laboratory; Luban, Marshall [Ames Laboratory; Timco, Grigore A [The University of Manchester; Tuna, Floriana [The University of Manchester; Winpenny, Richard E [The University of Manchester

    2014-06-01T23:59:59.000Z

    We present a refined model of the {Fe9} tridiminished icosahedron magnetic molecule system. This molecule was originally modeled as being composed of two ({Fe3} and {Fe6}) clusters, with the Fe3+ ions within each cluster being coupled via exchange interactions, but with no coupling between the clusters. The present inelastic neutron scattering (INS) measurements were used to probe the low-lying energy spectrum of {Fe9}, and these results demonstrate that the previously published model of two uncoupled clusters is incomplete. To achieve agreement between the experiment and theory, we have augmented the model with relatively small exchange coupling between the clusters. A combination of Lanczos matrix diagonalization and quantum Monte Carlo simulations have been used to achieve good agreement between the experimental data and the improved model of the full {Fe9} system despite the complexity of this model (with Hilbert space dimension >107).

  2. Cation self-diffusion in Fe/sub 2/O/sub 3/

    SciTech Connect (OSTI)

    Hoshino, K.; Peterson, N.L.

    1984-01-01T23:59:59.000Z

    Self-diffusion of /sup 59/Fe in single crystals of Fe/sub 2/O/sub 3/ parallel to the c-axis has been measured as a function of temperature (1150 to 1340/sup 0/C) and oxygen partial pressure (2 x 10/sup -3/) less than or equal to Po/sub 2/ less than or equal to 1 atm). The oxygen partial pressure dependence of the diffusivity indicates that cation self-diffusion occurs by an interstitial-type mechanism. The simultaneous diffusion of /sup 52/Fe and /sup 59/Fe has been measured in Fe/sub 2/O/sub 3/ at 1251/sup 0/C and Po/sub 2/ = 1.91 x 10/sup -2/ atm. The small value of the isotope effect (f..delta..K = 0.067 +- 0.016) is consistent with diffusion of Fe ions by an interstitially mechanism.

  3. Development of an Fe efficiency screening procedure for sorghum based on realistic soil parameters 

    E-Print Network [OSTI]

    Hernandez, Francisco

    1987-01-01T23:59:59.000Z

    , are considered to be good indicators of Fe use efficiency in plants, and thus were the basis determining Fe-efficiency of the sorghum cultivars. Rodriguez de Cianzio et al. (1979) reported that visual chlorosis ratings weze highly correlated (r=0. 90...DEVELOPMENT OF AN FE EFFICIENCY SCREENING PROCEDURE FOR SORGHUH BASED ON REAl ISTIC SOIL PARAHETERS A Thesis by FRANCISCO HERNANDEZ Submitted to the Graduate College of Texas ASH University in partial fulfillment of the requirements...

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

    E-Print Network [OSTI]

    Zheng, Yufeng

    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

  5. The impact of alpha/Fe enhanced stellar evolutionary tracks on the ages of elliptical galaxies

    E-Print Network [OSTI]

    Daniel Thomas; Claudia Maraston

    2003-02-04T23:59:59.000Z

    We complement our study of alpha/Fe enhanced stellar population models of Lick absorption indices (Thomas et al. 2003) by comparing two sets of alpha/Fe enhanced models. In both models the impact on Lick indices due to alpha/Fe enhancement is accounted for through a modification of the stellar absorption line-strengths using the response functions of Tripicco & Bell (1995). One set of models, however, uses solar-scaled, the other alpha/Fe enhanced stellar evolutionary tracks. Since the alpha/Fe enhanced tracks are hotter than the solar-scaled ones (Salasnich et al. 2000), the correspondent stellar population models have slightly weaker metallic indices (i.e. Mgb, etc.) and stronger Balmer line indices (Hbeta) (Maraston et al 2003). Here we explore quantitatively the impact of this effect on the alpha/Fe ratios, metallicities and ages that are derived for elliptical galaxies. We find that the modest decrease of the metallic indices Mgb and balance each other, such that fully consistent alpha/Fe ratios are derived for stellar systems using alpha/Fe enhanced models with either solar-scaled or alpha/Fe enhanced stellar tracks. The decrease of the metallic indices and the increase of Hbeta conspire in a way that also consistent metallicities are obtained. The derived ages, instead, are significantly different. The inclusion of alpha/Fe enhanced stellar tracks leads to the derivation of ages as high as 30 Gyr for elliptical galaxies. For the same objects, ages not older than 15 Gyr are obtained, if alpha/Fe enhanced models using solar-scaled tracks are adopted. This may indicate that current stellar evolutionary models overestimate the bluing of stellar evolutionary tracks due to alpha/Fe enhanced chemical mixtures at super-solar metallicities.

  6. Controlling ferromagnetism of (In,Fe)As semiconductors by electron doping

    SciTech Connect (OSTI)

    Dang Vu, Nguyen; Fukushima, Tetsuya; Katayama-Yoshida, Hiroshi [Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531 (Japan); Sato, Kazunori [Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

    2014-02-21T23:59:59.000Z

    Based on experimental results, using the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA) method and Monte Carlo simulation, we study the mechanism of ferromagnetic behavior of (In,Fe)As. We show that with doped Be atoms occupying in interstitial sites, chemical pair interactions between atoms and magnetic exchange interactions between Fe atoms change due to electron concentration. Therefore, by controlling the doping process, magnetic behavior of (In,Fe)As is controlled and ferromagnetism is observed in this semiconductor.

  7. The reaction of Fe and Ni at intermediate energies

    E-Print Network [OSTI]

    Liddick, Sean Nicholas

    2013-02-22T23:59:59.000Z

    of the LtVrIVERSITY UNDERGRADUATE RESEARCH FEI LOtVS April 2001 Group. Physical Sciences THE REACTION OF Fe AND Vi AT IlvTFRMEDIATE ENERGIFS A Senior Honors Thesis B& SEAN NICHOLAS I. IDDICK Submitted to the Office of Honors Progran & Academic..., and the energy of the incident beam. Sean Nicholas Liddick Department of Chemistry Texas AilcM University Fellows Advisor: Dr, Sherry Yennello Department of Chemistry TABLE OF CONTFNTS ABSTRACT Page i 1 i TABI E OF CONTENTS. LIST OF FIGURES...

  8. Cu-Ni-Fe anodes having improved microstructure

    DOE Patents [OSTI]

    Bergsma, S. Craig; Brown, Craig W.

    2004-04-20T23:59:59.000Z

    A method of producing aluminum in a low temperature electrolytic cell containing alumina dissolved in an electrolyte. The method comprises the steps of providing a molten electrolyte having alumina dissolved therein in an electrolytic cell containing the electrolyte. A non-consumable anode and cathode is disposed in the electrolyte, the anode comprised of Cu--Ni--Fe alloys having single metallurgical phase. Electric current is passed from the anode, through the electrolyte to the cathode thereby depositing aluminum on the cathode, and molten aluminum is collected from the cathode.

  9. Improved oxidation sulfidation resistance of Fe-Cr-Ni alloys

    DOE Patents [OSTI]

    Natesan, K.; Baxter, D.J.

    1983-07-26T23:59:59.000Z

    High temperature resistance of Fe-Cr-Ni alloy compositions to oxidative and/or sulfidative conditions is provided by the incorporation of about 1 to 8 wt % of Zr or Nb and results in a two-phase composition having an alloy matrix as the first phase and a fine grained intermetallic composition as the second phase. The presence and location of the intermetallic composition between grains of the matrix provides mechanical strength, enhanced surface scale adhesion, and resistance to corrosive attack between grains of the alloy matrix at temperatures of 500 to 1000/sup 0/C.

  10. Oxidation sulfidation resistance of Fe-Cr-Ni alloys

    DOE Patents [OSTI]

    Natesan, Ken (Naperville, IL); Baxter, David J. (Woodridge, IL)

    1984-01-01T23:59:59.000Z

    High temperature resistance of Fe-Cr-Ni alloy compositions to oxidative and/or sulfidative conditions is provided by the incorporation of about 1-8 wt. % of Zr or Nb and results in a two-phase composition having an alloy matrix as the first phase and a fine grained intermetallic composition as the second phase. The presence and location of the intermetallic composition between grains of the matrix provides mechanical strength, enhanced surface scale adhesion, and resistance to corrosive attack between grains of the alloy matrix at temperatures of 500.degree.-1000.degree. C.

  11. Nonlinear FE analysis of cracks in tension and shear

    E-Print Network [OSTI]

    Kesse, G.; Lees, Janet M.

    2007-05-01T23:59:59.000Z

    Carbon FRP Shear Reinforcement. PhD thesis, University of Cambridge, UK, 2003. 3. Bazant Z. P. and Planas J. Fracture and Size Effect in Con- crete and Other Quasibrittle Materials. CRC Press, Boca Raton, Florida, 1998. Nonlinear FE analysis of cracks... of plain concrete to cyclic tension. ACI Materials Journal, 1987, 84, No. 5, 365–373. 9. Paulay T. and Loeber P. J. Shear transfer by aggregate inter- lock. ACI Special Publication, SP-42, 1974, 1, 1–14. 10. Houde J. and Mirza M. S. A finite element...

  12. Inelastic scattering of fast neutrons from $^{56}$Fe

    E-Print Network [OSTI]

    Beyer, R; Hannaske, R; Junghans, A R; Massarczyk, R; Anders, M; Bemmerer, D; Ferrari, A; Kögler, T; Röder, M; Schmidt, K; Wagner, A

    2014-01-01T23:59:59.000Z

    Inelastic scattering of fast neutrons from $^{56}$Fe was studied at the photoneutron source nELBE. The neutron energies were determined on the basis of a timeof- flight measurement. Gamma-ray spectra were measured with a high-purity germanium detector. The total scattering cross sections deduced from the present experiment in an energy range from 0.8 to 9.6 MeV agree within 15% with earlier data and with predictions of the statistical-reaction code Talys.

  13. Balmer Absorption Lines in FeLoBALs

    E-Print Network [OSTI]

    K. Aoki; I. Iwata; K. Ohta; N. Tamura; M. Ando; M. Akiyama; G. Kiuchi; K. Nakanishi

    2006-12-14T23:59:59.000Z

    We discovered non-stellar Balmer absorption lines in two many-narrow-trough FeLoBALs (mntBALs) by the near-infrared spectroscopy with Subaru/CISCO. Presence of the non-stellar Balmer absorption lines is known to date only in the Seyfert galaxy NGC 4151, thus our discovery is the first cases for quasars. Since all known active galactic nuclei with Balmer absorption lines share characteristics, it is suggested that there is a population of BAL quasars which have unique structures at their nuclei or unique evolutionary phase.

  14. Startup Funding Forum on October 18 in Santa Fe

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our Instagram Secretary900 SpecialNanoparticulate FeS asEnzyme2ResidualStartup

  15. FE FY 2016 BUDGET REQUEST PRESENTATION | Department of Energy

    Office of Environmental Management (EM)

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  16. FE Implementation of the Recovery Act | Department of Energy

    Office of Environmental Management (EM)

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  17. FE Oil and Natural Gas News | Department of Energy

    Office of Environmental Management (EM)

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  18. Los Alamos National Security invests in Santa Fe Community College

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests in Santa Fe Community College

  19. AgFe Management Ltd | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTriWildcat 1AMEE JumpAeroWind Inc.Information AfluenteAg Fuels LtdAgFe

  20. SF 6432-FE Fixed Price Contracts Outside the US

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

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  1. FE Leaders Discuss African Energy Development | Department of Energy

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

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  2. Santa Fe Chamber of Commerce Business Awards Gala

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiationImplementingnpitcheResearch Briefs TheSanket A. Deshmukh ArgonneSanta Fe Chamber

  3. Magnetization, magnetic susceptibility, effective magnetic moment of Fe{sup 3+} ions in Bi{sub 25}FeO{sub 39} ferrite

    SciTech Connect (OSTI)

    Zatsiupa, A.A., E-mail: zatsiupa@mail.ru [Belarussian State Technological University, 220030 Minsk (Belarus); Bashkirov, L.A. [Belarussian State Technological University, 220030 Minsk (Belarus); Troyanchuk, I.O. [Scientific and Practical Materials Research Centre of the NAS of Belarus, 220072 Minsk (Belarus); Petrov, G.S. [Belarussian State Technological University, 220030 Minsk (Belarus); Galyas, A.I.; Lobanovsky, L.S.; Truhanov, S.V. [Scientific and Practical Materials Research Centre of the NAS of Belarus, 220072 Minsk (Belarus)

    2014-04-01T23:59:59.000Z

    Magnetic susceptibility for ferrite Bi{sub 25}FeO{sub 39} is measured at 5–950 K in the magnetic field of 0.86 T. It is shown that Bi{sub 25}FeO{sub 39} is paramagnetic in the temperature range 5?950 K. The saturation magnetization is equal to 5.04?{sub B} per formula unit at 5 K in a magnetic field of 10 T. It is found that at 5?300 K the effective magnetic moment of Fe{sup 3+} ions in Bi{sub 25}FeO{sub 39} is equal to 5.82?{sub B}. - Graphical abstract: The dependence of the magnetization (n, ?{sub B}) on the magnetic field for one formula unit of Bi{sub 25}FeO{sub 39} at 5 K. - Highlights: • Magnetic susceptibility for Bi{sub 25}FeO{sub 39} is measured at 5–950 K in the magnetic field of 0.86 T. • It is shown that Bi{sub 25}FeO{sub 39} is paramagnetic in the temperature range 5?950 K. • The saturation magnetization is equal to 5.04?{sub B} per formula unit at 5 K in a magnetic field of 10 T.

  4. Effect of CoFe insertion in Co{sub 2}MnSi/CoFe/n-GaAs junctions on spin injection properties

    SciTech Connect (OSTI)

    Ebina, Yuya; Akiho, Takafumi; Liu, Hong-xi; Yamamoto, Masafumi; Uemura, Tetsuya, E-mail: uemura@ist.hokudai.ac.jp [Division of Electronics for Informatics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814 (Japan)

    2014-04-28T23:59:59.000Z

    The CoFe thickness (t{sub CoFe}) dependence of spin injection efficiency was investigated for Co{sub 2}MnSi/CoFe/n-GaAs junctions. The ?V{sub NL}/I value, which is a measure of spin injection efficiency, strongly depended on t{sub CoFe}, where ?V{sub NL} is the amplitude of a nonlocal spin-valve signal, and I is an injection current. Importantly, the maximum value of ?V{sub NL}/I for a Co{sub 2}MnSi/CoFe/n-GaAs junction was one order of magnitude higher than that for a CoFe/n-GaAs junction, indicating that a Co{sub 2}MnSi electrode works as a highly polarized spin source. No clear spin signal, on the other hand, was observed for a Co{sub 2}MnSi/n-GaAs junction due to diffusion of Mn atoms into the GaAs channel. Secondary ion mass spectrometry analysis indicated that the CoFe insertion effectively suppressed the diffusion of Mn into GaAs, resulting in improved spin injection properties compared with those for a Co{sub 2}MnSi/n-GaAs junction.

  5. Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

    SciTech Connect (OSTI)

    Zhang, Qiang [Ames Laboratory; Tian, Wei [Ames Laboratory; Li, Haifeng [Ames Laboratory; Kim, Jong-Woo [Argonne Naitonal Laboratory; Yan, Jiaqiang [Ames Laboratory; McCallum, Robert William [Ames Laboratory; Lograsso, Thomas A. [Ames Laboratory; Zarestky, Jerel L. [Ames Laboratory; Budko, Sergey L. [Ames Laboratory; McQueeney, Robert J. [Ames Laboratory; Vaknin, David [Ames Laboratory

    2013-11-27T23:59:59.000Z

    Neutron and synchrotron resonant x-ray magnetic scattering (RXMS) complemented by heat capacity and resistivity measurements reveal the evolution of the magnetic structures of Fe and Ce sublattices in a CeFeAsO single crystal. The RXMS of magnetic reflections at the Ce LII edge shows a magnetic transition that is specific to the Ce antiferromagnetic long-range ordering at TCe? 4 K with short-range Ce ordering above TCe, whereas neutron diffraction measurements of a few magnetic reflections indicate a transition at T?? 12 K with an unusual order parameter. Detailed order-parameter measurements on several magnetic reflections by neutrons show a weak anomaly at 4 K that we associate with the Ce ordering. The successive transitions at TCe and T? can also be clearly identified by two anomalies in heat capacity and resistivity measurements. The higher transition temperature at T?? 12 K is mainly ascribed to Fe spin reorientation transition, below which Fe spins rotate uniformly and gradually in the ab plane. The Fe spin reorientation transition and short-range Ce ordering above TCe reflect the strong Fe-Ce couplings prior to long-range ordering of the Ce. The evolution of the intricate magnetic structures in CeFeAsO going through T? and TCe is proposed.

  6. The Role of FeS in Initial Activation and Performance Degradation...

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

    optimum level of FeS in the cathode resulted in minimum Ni particle growth and improved battery cycling performance. The results of electrochemical characterization indicated...

  7. Synergistic Catalysis between Pd and Fe in Gas Phase Hydrodeoxygenation of m-Cresol

    SciTech Connect (OSTI)

    Hong, Yongchun; Zhang, He; Sun, Junming; Karim, Ayman M.; Hensley, Alyssa; Gu, Meng; Engelhard, Mark H.; McEwen, Jean-Sabin; Wang, Yong

    2014-10-31T23:59:59.000Z

    In this work, a series of Pd/Fe2O3 catalysts were synthesized, characterized, and evaluated for the hydrodeoxygenation (HDO) of m-cresol. It was found that the addition of Pd remarkably promotes the catalytic activity of Fe while the product distributions resemble that of monometallic Fe catalyst, showing high selectivity towards the production of toluene (C-O cleavage without saturation of aromatic ring and C-C cleavage). Reduced catalysts featured with Pd patches on the top of reduced Fe nanoparticle surface, and the interaction between Pd and Fe was further confirmed using X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM) and X-ray absorption near edge fine structure (XANES). A possible mechanism, including Pd assisted H2 dissociation and Pd facilitated stabilization of metallic Fe surface as well as Pd enhanced product desorption, is proposed to be responsible for the high activity and HDO selectivity in Pd-Fe catalysts. The synergic catalysis derived from Pd-Fe interaction found in this work was proved to be applicable to other precious metal promoted Fe catalysts, providing a promising strategy for future design of highly active and selective HDO catalysts.

  8. Mass Measurements of Proton-Rich Nuclei Fe-50 and Ni-54 

    E-Print Network [OSTI]

    Tribble, Robert E.; Cossairt, J. D.; May, D. P.; Kenefick, R. A.

    1977-01-01T23:59:59.000Z

    PHYSICAL REUIE% C VOLUME 16, N UMBER 2 AUGUST 1977 Mess measurements of' the proton-rich nuciei Fe and ~Nit R. E. Tribble, ~ J. D. Cossairt, D. P. May, and R. A. Kenefick Cyclotron Institute and Physics Department, Texas A AM University, College... Station, Texas 77843 {Received 6 December 1976) The reactions "Fe{'He,'He)' Fe and "Ni{'He,'He)"Ni have been observed at an incident a energy of 110 MeV. The reaction Q values are found to be Q{ Fe) = ?50.95 + 0.06 MeV and Q{' Ni) = ?50.19 + 0.05 Me...

  9. Electrochemical performance of Sol-Gel synthesized LiFePO4 in lithium batteries

    E-Print Network [OSTI]

    Hu, Yaoqin; Doeff, Marca M.; Kostecki, Robert; Finones, Rita

    2003-01-01T23:59:59.000Z

    LiFePO 4 in Lithium Batteries Yaoqin Hu,* Marca M. Doeff,*material in lithium ion batteries based on environmental and

  10. Nanostructure evolution in joining of Al and Fe nanoparticles with femtosecond laser irradiation

    SciTech Connect (OSTI)

    Jiao, Z. [State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001 (China); Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Huang, H.; Zhou, Y., E-mail: hepeng@hit.edu.cn, E-mail: nzhou@uwaterloo.ca [Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Liu, L. [Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Department of Mechanical Engineering, Tsinghua University, Beijing 100084 (China); Hu, A. [Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37916 (United States); Duley, W. [Centre for Advanced Materials Joining, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); He, P., E-mail: hepeng@hit.edu.cn, E-mail: nzhou@uwaterloo.ca [State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001 (China)

    2014-04-07T23:59:59.000Z

    The joining of Al-Fe nanoparticles (NPs) by femtosecond (fs) laser irradiation is reported in this paper. Fe and Al NPs were deposited on a carbon film in vacuum via fs laser ablation. Particles were then exposed to multiple fs laser pulses at fluences between 0.5 and 1.3?mJ/cm{sup 2}. Transmission Electron Microscopy (TEM) and Electron Diffraction X-ray observations indicate that Al and Fe NPs bond to each other under these conditions. For comparison, bonding of Al to Al and Fe to Fe NPs was also investigated. The nanostructure, as observed using TEM, showed that individual Al NPs were monocrystalline while individual Fe NPs were polycrystalline prior to joining and that these structures are retained after the formation of Al-Al and Fe-Fe NPs. Al-Fe NPs produced by fs laser joining exhibited a mixed amorphous and crystalline phase at the interface. Bonding is suggested to originate from intermixing within a region of high field intensity between particles.

  11. SciTech Connect: A Solution for Solution-Produced [beta]-FeSe...

    Office of Scientific and Technical Information (OSTI)

    A Solution for Solution-Produced beta-FeSe: Elucidating and Overcoming Factors that Prevent Superconductivity Citation Details In-Document Search Title: A Solution for...

  12. Origin of room temperature ferromagnetic moment in Rh-rich Rh/Fe multilayer thin films

    E-Print Network [OSTI]

    Laughlin, David E.

    films of FeRh was done by electron beam melting on amorphous substrates3 but the low extent of ordering

  13. HIGH RESOLUTION SCANNING AUGER MICROSCOPIC INVESTIGATION OF INTERGRANULAR FRACTURE IN AS-QUENCHED Fe-12Mn

    E-Print Network [OSTI]

    Lee, H.J.

    2013-01-01T23:59:59.000Z

    contents in Fe-Mn alloys. Scanning electron fractographsTransactions HIGH RESOLUTION SCANNING AUGER MICROSCOPICof Califomia. HIGH RESOLUTION SCANNING AUGER MICROSCOPIC

  14. Connecting Observations of Hematite (a Fe2O3) Growth Catalyzed...

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

    structural Fe(III) in iron oxides and oxyhydroxides is important for understanding degradation of environmental pollutants through its apparent constitutive role underlying...

  15. Preservation of Fe(II) by Carbon-Rich Matrices in Hydrothermal...

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

    with organic material from nearby flora and fauna. The collaboration suggests that the organic matrices prevent oxidation and precipitation of the Fe(II), perhaps increasing...

  16. Immobilization of 99-Technetium (VII) by Fe(II)-Goethite and...

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

    of Fe(II) to sequester Tc present in both deionized water and simulated off-gas scrubber waste solutions. Pertechnetate concentration in solution decreased immediately when...

  17. Effect of conductive additives in LiFePO4 cathode for lithium-ion batteries

    E-Print Network [OSTI]

    Shim, J.; Guerfi, A.; Zaghib, K.; Striebel, K.A.

    2003-01-01T23:59:59.000Z

    Effect of Conductive Additives in LiFePO 4 Cathode forcapacity on conductive additive content and specificthe amount of conductive additive increases. The addition of

  18. Phonon densities of states of face-centered-cubic Ni-Fe alloys

    SciTech Connect (OSTI)

    Lucas, Matthew [United States Air Force Research Laboratory, Wright-Patterson Air Force Base] [United States Air Force Research Laboratory, Wright-Patterson Air Force Base; Mauger, L [California Institute of Technology, W. M. Keck Laboratory, Pasadena] [California Institute of Technology, W. M. Keck Laboratory, Pasadena; Munoz, Jorge A. [California Institute of Technology, Pasadena] [California Institute of Technology, Pasadena; Halevy, I [California Institute of Technology, Pasadena] [California Institute of Technology, Pasadena; Horwath, J [United States Air Force Research Laboratory, Wright-Patterson Air Force Base] [United States Air Force Research Laboratory, Wright-Patterson Air Force Base; Semiatin, S L [United States Air Force Research Laboratory, Wright-Patterson Air Force Base] [United States Air Force Research Laboratory, Wright-Patterson Air Force Base; Leontsev, S. O. [University of Kentucky, Lexington] [University of Kentucky, Lexington; Stone, Matthew B [ORNL] [ORNL; Abernathy, Douglas L [ORNL] [ORNL; Xiao, Yuming [Carnegie Institution of Washington] [Carnegie Institution of Washington; Chow, P [HPCAT Geophysical Lab, Argonne, IL] [HPCAT Geophysical Lab, Argonne, IL; Fultz, B. [California Institute of Technology, Pasadena] [California Institute of Technology, Pasadena

    2013-01-01T23:59:59.000Z

    Inelastic neutron scattering and nuclear resonant inelastic x-ray scattering were used to determine the phonon densities of states of face-centered-cubic Ni-Fe alloys. Increasing Fe concentration results in an average softening of the phonon modes. Chemical ordering of the Ni0.72Fe0.28 alloy results in a reduction of the partial vibrational entropy of the Fe atoms but does not significantly change the partial vibrational entropy of the Ni atoms. Changes in the phonon densities of states with composition and chemical ordering are discussed and analyzed with a cluster expansion method.

  19. Structural, thermodynamic, mechanical, and magnetic properties of FeW system

    SciTech Connect (OSTI)

    Ren, Q. Q.; Fan, J. L.; Han, Y.; Gong, H. R., E-mail: gonghr@csu.edu.cn [State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083 (China)

    2014-09-07T23:59:59.000Z

    The Fe-W system is systematically investigated through a combined use of first-principles calculation, cluster expansion, special quasirandom structures, and experiments. It is revealed that the ferromagnetic state of BCC Fe-W solid solution has lower heat of formation than its nonmagnetic state within the entire composition range, and intermetallic ?-Fe{sub 2}W and ?-Fe{sub 7}W{sub 6} phases are energetically favorable with negative heats of formation. Calculations also show that the Fe-W solid solution has much lower coefficient of thermal expansion than its mechanical mixture, and that the descending sequence of temperature-dependent elastic moduli of each Fe-W solid solution is E?>?G?>?B. Moreover, magnetic state should have an important effect on mechanical properties of Fe-W phases, and electronic structures can provide a deeper understanding of various properties of Fe-W. The derived results agree well with experimental observations, and can clarify two experimental controversies regarding structural stability and magnetic property of Fe-W phases in the literature.

  20. Improvement of SOFC Electrodes through Catalyst Infiltration & Control of Cr Volatilization from FeCr Components

    SciTech Connect (OSTI)

    Visco, S.J.; Jacobson, C.; Kurokawa, H.; Sholklapper, T.; Lu, C.; De Jonghe, L.

    2005-01-28T23:59:59.000Z

    This presentation discusses the improvement of SOFC electrodes through catalyst infiltration and control of Cr volatilization from FeCr components.

  1. Search for Resonant Absorption of Solar Axions Emitted in M1 Transition in $^{57}$Fe Nuclei

    E-Print Network [OSTI]

    A. V. Derbin; A. I. Egorov; I. A. Mitropol'sky; V. N. Muratova; D. A. Semenov; E. V. Unzhakov

    2009-06-01T23:59:59.000Z

    A search for resonant absorbtion of 14.4 keV solar axions by $^{57}$Fe target was performed. The Si(Li) detector placed inside the low-background setup was used to detect the $\\gamma$-quanta appearing in the deexcitation of 14.4 keV nuclear level: $A+\\rm{^{57}Fe} \\to \\rm{^{57}Fe^{*}} \\to \\rm{^{57}Fe} + \\gamma$. The new upper limit for the hadronic axion mass have been obtained: $m_{A} \\leq 151$ eV (90% C.L.) ($S$=0.5, $z$=0.56).

  2. CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE

    SciTech Connect (OSTI)

    Jaisi, Deb P.; Kukkadapu, Ravi K.; Eberl, Dennis D.; Dong, Hailiang

    2005-12-01T23:59:59.000Z

    A quantitative study was performed to understand how Fe(III) site occupancy controls Fe(III) bioreduction in nontronite by Shewanella putrefaciens CN32. NAu-1 and NAu-2 were nontronites and contained Fe(III) in different structure sites with 16% and 23% total iron (w/w), respectively, with almost all iron as Fe(III). Moessbauer spectroscopy showed that Fe(III) was present in the octahedral site in NAu-1 (with a small amount of goethite), but in both the tetrahedral and the octahedral sites in NAu-2. Moessbauer data further showed that the octahedral Fe(III) in NAu-2 existed in at least two environments- trans (M1) and cis (M2) sites. The microbial Fe(III) reduction in NAu-1 and NAu-2 was studied in batch cultures at a nontronite concentration of 5mg/mL in bicarbonate buffer with lactate as the electron donor. Fe(II) production in inoculated treatments was determined by extraction with 0.5 N HCl and compared to uninoculated controls to establish the extent of biological reduction. The resulting solids were characterized by X-ray diffraction (XRD), Moessbauer spectroscopy, and transmission electron microscopy (TEM). In the presence of an electron shuttle, anthraquinone-2,6-disulfonate (AQDS), the extent of bioreduction was 11-16% for NAu-1 but 28-32% for NAu-2. The extent of reduction in the absence of AQDS was only 5-7% in NAu-1 but 14-18% in NAu-2. The reduction rate was also faster in NAu-2 than that in NAu-1. Moessbauer data of the bioreduced nontronite materials indicated that the Fe(III) reduction in NAu-1 was mostly from the presence of goethite, whereas the reduction in NAu-2 was due to the presence of the tetrahedral and trans-octahedral Fe(III) in the structure. The measured aqueous Fe(II) was negligible [< 2.5% of the total biogenic Fe(II)]. As a result of bioreduction, the average nontronite particle thickness remained nearly the same (from 2.1 to 2.5 nm) for NAu-1, but decreased significantly from 6 to 3.5 nm for NAu-2 with a concomitant change in crystal size distribution. The decrease in crystal size suggests reductive dissolution of nontronite NAu-2, which was supported by aqueous solution chemistry (i.e., aqueous Si). These data suggest that the more extensive Fe(III) bioreduction in NAu-2 was due to the presence of the tetrahedral and the trans-octahedral Fe(III), which was presumed to be more reducible. The biogenic Fe(II) was not associated with biogenic solids such as siderite or green rust or in the aqueous solution. We infer that it may be either adsorbed onto surfaces of nontronite particles/bacteria and in the structure of nontronite. Furthermore, we have demonstrated that natural nontronite clays were capable of supporting cell growth even in non-growth medium, possibly due to presence of naturally existing nutrients in the nontronite clays. These results suggest that crystal chemical environment of Fe(III) is an important determinant in controlling the rate and extent of microbial reduction of Fe(III) in nontronite.

  3. Proton spectroscopy of 48Ni, 46Fe, and 44Cr

    E-Print Network [OSTI]

    M. Pomorski; M. Pfützner; W. Dominik; R. Grzywacz; A. Stolz; T. Baumann; J. S. Berryman; H. Czyrkowski; R. D?browski; A. Fija?kowska; T. Ginter; J. Johnson; G. Kami?ski; N. Larson; S. N. Liddick; M. Madurga; C. Mazzocchi; S. Mianowski; K. Miernik; D. Miller; S. Paulauskas; J. Pereira; K. P. Rykaczewski; S. Suchyta

    2014-07-06T23:59:59.000Z

    Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48Ni including four events of two-proton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of \\b{eta}-delayed protons emitted in the decays of 44Cr and 46Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the \\b{eta}2p decay of 46 Fe, based on one clear event, is shown.

  4. Postirradiation deformation of ferritic Fe-Cr binary alloys

    SciTech Connect (OSTI)

    Hamilton, M.L.; Gelles, D.S.

    1991-06-01T23:59:59.000Z

    Six binary Fe-Cr alloys ranging from 3 to 18% chromium were irradiated in the form of miniature tensile specimens in the Fast Flux Test Facility and tested at room temperature. The irradiation conditions produced 7 to 30 dpa at 365 to 574{degrees}C. The major purpose of the experiment was to compare the behavior of these simple alloys with that of more complex commercial alloys, The tensile data obtained on these specimens at room temperature are discussed with appropriate fractographic and microstructural support. Previous studies on similar materials had revealed the presence of a feature typically exhibited in channel fractures: elongated voids were evident in shear bands of an irradiated and deformed TEM disk of a binary Fe-6Cr alloy. An additional purpose of the experiment was therefore to provide a better understanding of the potential contribution of channel fracture to deformation in ferritic alloys. No evidence for channel fracture was found, however. 14 refs., 6 figs., 2 tabs.

  5. Si and Fe depletion in Galactic star-forming regions observed by the Spitzer Space Telescope

    E-Print Network [OSTI]

    Yoko Okada; Takashi Onaka; Takashi Miyata; Yoshiko K. Okamoto; Itsuki Sakon; Hiroshi Shibai; Hidenori Takahashi

    2008-04-10T23:59:59.000Z

    We report the results of the mid-infrared spectroscopy of 14 Galactic star-forming regions with the high-resolution modules of the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. We detected [SiII] 35um, [FeII] 26um, and [FeIII] 23um as well as [SIII] 33um and H2 S(0) 28um emission lines. Using the intensity of [NII] 122um or 205um and [OI] 146um or 63um reported by previous observations in four regions, we derived the ionic abundance Si+/N+ and Fe+/N+ in the ionized gas and Si+/O0 and Fe+/O0 in the photodissociation gas. For all the targets, we derived the ionic abundance of Si+/S2+ and Fe2+/S2+ for the ionized gas. Based on photodissociation and HII region models the gas-phase Si and Fe abundance are suggested to be 3-100% and solar abundance, respectively, for the ionized gas and 16-100% and 2-22% of the solar abundance, respectively, for the photodissociation region gas. Since the [FeII] 26um and [FeIII] 23um emissions are weak, the high sensitivity of the IRS enables to derive the gas-phase Fe abundance widely in star-forming regions. The derived gas-phase Si abundance is much larger than that in cool interstellar clouds and that of Fe. The present study indicates that 3-100% of Si atoms and <22% of Fe atoms are included in dust grains which are destroyed easily in HII regions, probably by the UV radiation. We discuss possible mechanisms to account for the observed trend; mantles which are photodesorbed by UV photons, organometallic complexes, or small grains.

  6. Role of cross-shell excitations in the reaction 54Fe(d_pol,p)55Fe

    E-Print Network [OSTI]

    M. Mahgoub; R. Kruecken; Th. Faestermann; A. Bergmaier; D. Bucurescu; R. Hertenberger; Th. Kroell; H. -F. Wirth; A. F. Lisetskiy

    2009-01-13T23:59:59.000Z

    The reaction 54Fe(d_pol,p)55Fe was studied at the Munich Q3D spectrograph with a 14 MeV polarized deuteron beam. Excitation energies, angular distributions and analyzing powers were measured for 39 states up to 4.5 MeV excitation energy. Spin and parity assignments were made and spectroscopic factors deduced by comparison to DWBA calculations. The results were compared to predictions by large scale shell model calculations in the full pf-shell and it was found that reasonable agreement for energies and spectroscopic factors below 2.5 MeV could only be obtained if up to 6 particles were allowed to be excited from the f_7/2 orbital into p_3/2, f_5/2, and p_1/2 orbitals across the N=28 gap. For levels above 2.5 MeV the experimental strength distribution was found to be significantly more fragmented than predicted by the shell model calculations.

  7. Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO??xFxand Sr(Fe??xCox)?As?

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

    Vilmercati, Paolo; Fedorov, Alexei; Bondino, Federica; Offi, Francesco; Panaccione, Giancarlo; Lacovig, Paolo; Simonelli, Laura; McGuire, Michael A.; Sefat, Athena S. M.; Mandrus, David; Sales, Brian C.; Egami, Takeshi; Ku, Wei; Mannella, Norman

    2012-06-01T23:59:59.000Z

    A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped CeFeAsO??xFx (x = 0, 0.11) and Sr(Fe??xCox)2As2 (x = 0, 0.10) pnictides. The rapid time scales of the photoemission process allowed the detection of large local spin moments fluctuating on a 10?¹? s time scale in the paramagnetic, antiferromagnetic, and superconducting phases, indicative of the occurrence of ubiquitous strong Hund's magnetic correlations. The magnitude of the spin moment is found to vary significantly among different families, 1.3?B in CeFeAsO and 2.1?B in SrFe?As?. Surprisingly, the spin moment is found to decrease considerably in the optimally doped samples, 0.9?B in CeFeAsO?.??F?.?? and 1.3?B in Sr(Fe?.?Co?.?)?As?. The strong variation of the spin moment against doping and material type indicates that the spin moments and the motion of itinerant electrons are influenced reciprocally in a self-consistent fashion, reflecting the strong competition between the antiferromagnetic superexchange interaction among the spin moments and the kinetic energy gain of the itinerant electrons in the presence of a strong Hund's coupling. By describing the evolution of the magnetic correlations concomitant with the appearance of superconductivity, these results constitute a fundamental step toward attaining a correct description of the microscopic mechanisms shaping the electronic properties in the pnictides, including magnetism and high-temperature superconductivity.

  8. PHYSICAL REVIEW B 88, 174406 (2013) High magnetic field study of the Tm2Fe17 and Tm2Fe17D3.2 compounds

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2013-01-01T23:59:59.000Z

    of the deuteride Tm2Fe17D3.2 has been carried out in steady (14 T) and pulsed (60 T and, in one case, up to 74 T in the deuteride. In either case the magnetization increases with magnetic field undulatorily in broad steps whose the powder data for the deuteride. Thus, the mean molecular field on Tm in Tm2Fe17D3.2 is found to be 49

  9. Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO??xFxand Sr(Fe??xCox)?As?

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

    Vilmercati, Paolo; Fedorov, Alexei; Bondino, Federica; Offi, Francesco; Panaccione, Giancarlo; Lacovig, Paolo; Simonelli, Laura; McGuire, Michael A.; Sefat, Athena S. M.; Mandrus, David; et al

    2012-06-01T23:59:59.000Z

    A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped CeFeAsO??xFx (x = 0, 0.11) and Sr(Fe??xCox)2As2 (x = 0, 0.10) pnictides. The rapid time scales of the photoemission process allowed the detection of large local spin moments fluctuating on a 10?¹? s time scale in the paramagnetic, antiferromagnetic, and superconducting phases, indicative of the occurrence of ubiquitous strong Hund's magnetic correlations. The magnitude of the spin moment is found to vary significantly among different families, 1.3?B in CeFeAsO and 2.1?Bmore »in SrFe?As?. Surprisingly, the spin moment is found to decrease considerably in the optimally doped samples, 0.9?B in CeFeAsO?.??F?.?? and 1.3?B in Sr(Fe?.?Co?.?)?As?. The strong variation of the spin moment against doping and material type indicates that the spin moments and the motion of itinerant electrons are influenced reciprocally in a self-consistent fashion, reflecting the strong competition between the antiferromagnetic superexchange interaction among the spin moments and the kinetic energy gain of the itinerant electrons in the presence of a strong Hund's coupling. By describing the evolution of the magnetic correlations concomitant with the appearance of superconductivity, these results constitute a fundamental step toward attaining a correct description of the microscopic mechanisms shaping the electronic properties in the pnictides, including magnetism and high-temperature superconductivity.« less

  10. SCT&E LNG, LLC - FE Dkt. No. 14-98-LNG | Department of Energy

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

    FE Dkt. No. 14-98-LNG SCT&E LNG, LLC - FE Dkt. No. 14-98-LNG The Office of Fossil Energy gives notice of receipt of an Application filed July 24, 2014, by SCT&E LNG, LLC (SCT&E),...

  11. Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: comparison of experiment and theory

    E-Print Network [OSTI]

    Wysin, Gary

    Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: comparison of experiment to evaluate their potential for application. In this study, the Faraday rotation enhancement of gold coated Fe2O3 nanoparticles (NP) is investigated experimentally and theoretically. The experiment shows

  12. Neutron powder diffraction of carbon-coated FeCo alloy nanoparticles John Henry J. Scotta)

    E-Print Network [OSTI]

    McHenry, Michael E.

    Neutron powder diffraction of carbon-coated FeCo alloy nanoparticles John Henry J. Scotta in carbon-coated FexCo1 x nanoparticles produced using a radio frequency plasma torch. The nanoparticles roll and machine. In this work, the order­disorder trans- formation in C-coated FeCo nanoparticles

  13. Fe3O4-LiMo3Se3 Nanoparticle Clusters as Superparamagnetic Nanocompasses

    E-Print Network [OSTI]

    Osterloh, Frank

    -iodopropionic acid treated LiMo3Se3 nanowire bundles with oleic acid-stabilized Fe3O4 nanoparticles of 2.8, 5Fe3O4-LiMo3Se3 Nanoparticle Clusters as Superparamagnetic Nanocompasses Frank E. Osterloh,*, Hiroki A scaleable chemical approach to functional nanoscale analogues of the magnetic compasses in magnetotactic

  14. Building the Santa Fe Artificial Stock Market Blake LeBaron

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    Building the Santa Fe Artificial Stock Market Blake LeBaron Brandeis University June 2002 Abstract This short summary presents an insider's look at the construction of the Santa Fe artificial stock of the directions that researchers have been taking is the use of agent-based financial markets. These "bottom- up

  15. Water adsorption on alpha-Fe2O3(0001) at near ambient conditions

    E-Print Network [OSTI]

    Yamamoto, Susumu

    2010-01-01T23:59:59.000Z

    Physical Chemistry Water adsorption on at n e a r a m b i eR U N N I N G H E A D : Water adsorption on a-Fe O (0001) *hydroxylation and water adsorption on a-Fe O (0001) at water

  16. Fe(II) Sorption on a Synthetic Montmorillonite. A Combined Macroscopic and Spectroscopic Study

    E-Print Network [OSTI]

    Wehrli, Bernhard

    , and the fate of contaminants.1-3 With respect to pollutant transformation reactions, Fe(II) bound to solid the reactivity of Fe(II) associated with (hydr)oxides, green rust, and iron-containing minerals such as magnetite minerals, although a large proportion of the iron pool in soils is thought to be present as sorbed

  17. Magnetic properties of Fe3C nanograins embedded in carbon matrix Y. H. Lee,a)

    E-Print Network [OSTI]

    Huang, Jung-Chun

    Magnetic properties of Fe3C nanograins embedded in carbon matrix Y. H. Lee,a) T. C. Han, and J. C. A. Huang Physics Department, National Cheng-Kung University, Tainan 70101, Taiwan, Republic of China rods was used in manufacturing carbon films with Fe3C nanograin inclusions. Both temperature- and field

  18. Short communication Chemically abrupt interface between Ce oxide and Fe films

    E-Print Network [OSTI]

    Kim, Sehun

    layer barrier. This situation can lead to partial oxidation of the ferromagnetic metals and degradationShort communication Chemically abrupt interface between Ce oxide and Fe films H.G. Lee a,b , D. Lee online 24 May 2005 Abstract A chemically abrupt Fe/Ce oxide interface can be formed by initial oxidation

  19. First-principles study of iron oxyfluorides and lithiation of FeOF

    E-Print Network [OSTI]

    Chevrier, Vincent L.

    First-principles studies of iron oxyfluorides in the FeF[subscript 2] rutile framework (FeO[subscript x]F[subscript 2?x], 0?x?1) are performed using density functional theory (DFT) in the general gradient approximation ...

  20. LOW ENERGYHIGH FLUX NITROGEN IMPLANTATION OF AN OXIDE-DISPERSION-STRENGTHENED FeAl INTERMETALLIC ALLOY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 LOW ENERGY­HIGH FLUX NITROGEN IMPLANTATION OF AN OXIDE- DISPERSION-STRENGTHENED Fe countercurrent diffusion of nitrogen and aluminium seems to proceed. As a result, segregation of -Fe is observed alloys, the nitridation of titanium aluminides have received most of the attention concerning

  1. Induced lattice strain in epitaxial Fe-based superconducting films on CaF{sub 2} substrates: A comparative study of the microstructures of SmFeAs(O,F), Ba(Fe,Co){sub 2}As{sub 2}, and FeTe{sub 0.5}Se{sub 0.5}

    SciTech Connect (OSTI)

    Ichinose, Ataru, E-mail: ai@criepi.denken.or.jp; Tsukada, Ichiro [Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka 240-0195 (Japan); Nabeshima, Fuyuki; Imai, Yoshinori; Maeda, Atsutaka [Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902 (Japan); Kurth, Fritz; Holzapfel, Bernhard; Iida, Kazumasa [Institute for Metallic Materials, IFW Dresden, 01171 Dresden (Germany); Ueda, Shinya; Naito, Michio [Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 (Japan)

    2014-03-24T23:59:59.000Z

    The microstructures of SmFeAs(O,F), Ba(Fe,Co){sub 2}As{sub 2}, and FeTe{sub 0.5}Se{sub 0.5} prepared on CaF{sub 2} substrates were investigated using transmission electron microscopy. The SmFeAs(O,F)/CaF{sub 2} interface is steep, without a disordered layer. By contrast, a chemical reaction occurs at the interface in the cases of Ba(Fe,Co){sub 2}As{sub 2} and FeTe{sub 0.5}Se{sub 0.5}. The reaction layers are located on opposite sides of the interface for Ba(Fe,Co){sub 2}As{sub 2} and FeTe{sub 0.5}Se{sub 0.5}. We found that the lattice distortion of the three superconducting films on the CaF{sub 2} substrates enhances the T{sub C} values compared with films prepared on oxide substrates. The origin of this lattice deformation varies depending on the superconducting material.

  2. Thermoelastic strain in polycrystalline FePd shape memory alloy thin film Jun Hyun Han a,

    E-Print Network [OSTI]

    Thermoelastic strain in polycrystalline Fe­Pd shape memory alloy thin film Jun Hyun Han a, , Juil shape memory alloy Elastic modulus Wrinkling Thermoelastic strain in a polycrystalline Fe­Pd thin film due to shape memory effect was determined from Hooke's law using the measured residual stress

  3. Multi-bit magnetic memory using Fe8 high spin molecules

    E-Print Network [OSTI]

    Keren, Amit

    16 10 17 10 18 10 19 10 20 QTM Magnetic cores Disk file Magnetic bubble Thin film Optical disk IBM molecule behaves independently. #12;8 [Fe8O2(OH)12(C6H15N3)6]Br7(H2O)Br8H2O Fe8 Molecule Iron Carbon

  4. From: To: FERGAS Subject: FE Docket No. 14-96-LNG Date:

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

    FE Docket No. 14-96-LNG Date: Monday, November 17, 2014 7:26:37 PM Dear DOE, I am writing in support of FE Docket No. 14-96-LNG and asking you to grant an Export License to The...

  5. Research paper The determination of labile Fe in ferrihydrite by ascorbic acid extraction

    E-Print Network [OSTI]

    Benning, Liane G.

    , grain-sizes and crystallinity. Furthermore the extraction of bioavailable Fe from potential mineral). No simple chemical extraction can replicate the diversity of these processes, nevertheless extractionsResearch paper The determination of labile Fe in ferrihydrite by ascorbic acid extraction

  6. A Twisted Ladder: Relating the Fe Superconductors to the High Tc Cuprates

    SciTech Connect (OSTI)

    Berg, E.

    2010-05-26T23:59:59.000Z

    We construct a 2-leg ladder model of an Fe-pnictide superconductor and discuss its properties and relationship with the familiar 2-leg cuprate model. Our results suggest that the underlying pairing mechanism for the Fe-pnictide superconductors is similar to that for the cuprates.

  7. Mapping magnetic fields of Fe3O4 nanosphere assemblies by electron holography

    E-Print Network [OSTI]

    Rubloff, Gary W.

    Magnetite (Fe3O4) nanocrystals have attracted much attention due to their unique magnetic properties, and bio-separation.1­3 Fe3O4 has also been demonstrated as an excellent storage material for lithium and mesocrystals, where magnetic interactions deter- mine the morphology.3 It is of great importance to identify

  8. Switchable diode effect and ferroelectric resistive switching in epitaxial BiFeO3 thin films

    E-Print Network [OSTI]

    Tian, Weidong

    Switchable diode effect and ferroelectric resistive switching in epitaxial BiFeO3 thin films Can observed in epitaxial multiferroic BiFeO3 BFO thin films. The forward direction of the rectifying current the switchable diode effect and the ferroelectric resistive switching in epitaxially BFO thin films. BFO thin

  9. Thermal equation of state of Fe3S and implications for sulfur in Earth's core

    E-Print Network [OSTI]

    Shen, Guoyin

    anvil cell (DAC). The thermal equation of state (EOS) of Fe3S was investigated up to pressures of 80 GPa.8(3) calibrated against NaCl in the B2 structure. The room temperature data were also calibrated against the EOS in Earth's core, because of its solar abundance and the ease with which it forms compounds with Fe. Other

  10. Large pyramid shaped single crystals of BiFeO{sub 3} by solvothermal synthesis method

    SciTech Connect (OSTI)

    Sornadurai, D.; Ravindran, T. R.; Paul, V. Thomas; Sastry, V. Sankara [Condensed Matter Physics Division, Materials Science Group, Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu (India); Condensed Matter Physics Division, Materials Science Group (India)

    2012-06-05T23:59:59.000Z

    Synthesis parameters are optimized in order to grow single crystals of multiferroic BiFeO{sub 3}. 2 to 3 mm size pyramid (tetrahedron) shaped single crystals were successfully obtained by solvothermal method. Scanning electron microscopy with EDAX confirmed the phase formation. Raman scattering spectra of bulk BiFeO3 single crystals have been measured which match well with reported spectra.

  11. Probe Mössbauer spectroscopy of mechanical alloying in binary Cr?{sup 57}Fe(1 at%) system

    SciTech Connect (OSTI)

    Elsukov, Evgeny P., E-mail: e-yelsukov@mail.ru; Kolodkin, Denis A., E-mail: e-yelsukov@mail.ru; Ul'yanov, Alexander L., E-mail: e-yelsukov@mail.ru; Porsev, Vitaly E., E-mail: e-yelsukov@mail.ru [Physical-Technical Institute UrB RAS, Izhevsk (Russian Federation)

    2014-10-27T23:59:59.000Z

    Solid state reactions during mechanical alloying (MA) in a binary mixture of powdered Cr and {sup 57}Fe in atomic ratio of 99:1 have been studied using {sup 57}Fe Mössbauer spectroscopy, X-ray diffraction and Auger spectrometry. The proposed model of MA includes formation of Cr(Fe){sub x}O{sub y} oxides at the contact places of Cr and Fe particles, formation of nanostructure with simultaneous dissolution of the oxides, penetration of Fe atoms along grain boundaries in close-to-boundary distorted zones of interfaces in a substitutional position, formation of the substitutional solid solution of Fe in Cr in the body of grains. It was shown that the increase in the BCC lattice parameter on increasing the milling time is due to the dissolution of oxides and formation of interstitial solid solution of O in Cr. There were established substantial differences in consumption of BCC Fe in a Mg ? Al ? Si ? Cr sequence due to the major role of chemical interaction of Mg(Al,Si,Cr) with Fe.

  12. INVESTIGATION OF THE ELECTRICAL PROPERTIES OF METAL/PYRITE (FeS2) JUNCTIONS

    E-Print Network [OSTI]

    Hall, Sharon J.

    cost was a factor and the unconventional solar cell candidates included: FeS2, CuO, and Zn3P2 (Wadia et al 2009:2702). For high volume production of solar panels, cheaper material for commercial use The nontoxic semiconductor pyrite FeS2 appeals to us as a good candidate for solar cells because it has a small

  13. Si and Fe depletion in Galactic star-forming regions observed by the Spitzer Space Telescope

    E-Print Network [OSTI]

    Okada, Yoko; Miyata, Takashi; Okamoto, Yoshiko K; Sakon, Itsuki; Shibai, Hiroshi; Takahashi, Hidenori

    2008-01-01T23:59:59.000Z

    We report the results of the mid-infrared spectroscopy of 14 Galactic star-forming regions with the high-resolution modules of the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. We detected [SiII] 35um, [FeII] 26um, and [FeIII] 23um as well as [SIII] 33um and H2 S(0) 28um emission lines. Using the intensity of [NII] 122um or 205um and [OI] 146um or 63um reported by previous observations in four regions, we derived the ionic abundance Si+/N+ and Fe+/N+ in the ionized gas and Si+/O0 and Fe+/O0 in the photodissociation gas. For all the targets, we derived the ionic abundance of Si+/S2+ and Fe2+/S2+ for the ionized gas. Based on photodissociation and HII region models the gas-phase Si and Fe abundance are suggested to be 3-100% and solar abundance, respectively, for the ionized gas and 16-100% and 2-22% of the solar abundance, respectively, for the photodissociation region gas. Since the [FeII] 26um and [FeIII] 23um emissions are weak, the high sensitivity of the IRS enables to de...

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

    E-Print Network [OSTI]

    Hwang, S.

    2010-01-01T23:59:59.000Z

    Parr, J. Gordon, J. Iron and Steel Inst. B, vol. 283,137 (Properties of Fe-12Mn-0.2Ti Steel at -196°C Yield Stress (FREE Fe-12Mn-O. 2Ti ALLOY STEEL FOR CRYOGENIC APPLICATIONS

  15. FE Electrical Report 2005-2006 By: Chris Dudasik, Tianyi Li, and Jeff Schvey

    E-Print Network [OSTI]

    Ruina, Andy L.

    , batteries, or general electrical theory, please see the Fe Electrical Team Report ­ Spring 2005 or the Fe the ground, the metal strip connected to the lever of the limit switch presses up against the case; this causes the signal wire to read +0v. When the foot is in the air, the strip is depressed and the signal

  16. Experimental constraints on the thermodynamics and sound velocities of hcp-Fe to core pressures

    E-Print Network [OSTI]

    Jackson, Jennifer M.

    that comprises the volume-dependent phonon density of states (DOS) of e-Fe at eleven compression points. From information about the partitioning behavior of iron isotopes in equilibrium processes involving solid e providing a new tight constraint on the density dependence of e-Fe's sound velocities to outer core

  17. Characteristics of Phosphate Adsorption-Desorption Onto Ferrihydrite: Comparison With Well-Crystalline Fe

    E-Print Network [OSTI]

    Sparks, Donald L.

    . Sparks2 Abstract: The adsorption-desorption behavior of phosphate on ferrihydrite, goethite, and hematite for ferrihydrite and goethite, yet more time for hematite; phosphate exchange with Fe-OH2 1/2+ and Fe-OH1/2j goethite (10%) 9 ferrihydrite (8.5%). The lower desorption for ferrihydrite indicates a higher percentage

  18. Exchange bias and blocking temperature distribution of Fe-film/CoO-nanoparticle hybrid bilayers

    E-Print Network [OSTI]

    Krishnan, Kannan M.

    relaxation in a Fe-film/CoO-nanoparticle hybrid system Appl. Phys. Lett. 101, 132401 (2012); 10 anisotropy energy per unit volume and V is the grain volume. Therefore, hybrid EB bilayers with the AF layer beExchange bias and blocking temperature distribution of Fe-film/CoO-nanoparticle hybrid bilayers Wei

  19. Nebular spectra and abundance tomography of the type Ia supernova SN 2011fe: a normal SN Ia with a stable Fe core

    E-Print Network [OSTI]

    Mazzali, P A; Filippenko, A V; Garnavich, P M; Clubb, K I; Maguire, K; Pan, Y -C; Shappee, R; Silverman, J M; Benetti, S; Hachinger, S; Nomoto, K; Pian, E

    2015-01-01T23:59:59.000Z

    A series of optical and one near-infrared nebular spectra covering the first year of the Type Ia supernova SN 2011fe are presented and modelled. The density profile that proved best for the early optical/ultraviolet spectra, "rho-11fe", was extended to lower velocities to include the regions that emit at nebular epochs. Model rho-11fe is intermediate between the fast deflagration model W7 and a low-energy delayed-detonation. Good fits to the nebular spectra are obtained if the innermost ejecta are dominated by neutron-rich, stable Fe-group species, which contribute to cooling but not to heating. The correct thermal balance can thus be reached for the strongest [FeII] and [FeIII] lines to be reproduced with the observed ratio. The 56Ni mass thus obtained is 0.47 +/- 0.05 Mo. The bulk of 56Ni has an outermost velocity of ~8500 km/s. The mass of stable iron is 0.23 +/- 0.03 Mo. Stable Ni has low abundance, ~10^{-2} Mo. This is sufficient to reproduce an observed emission line near 7400 A. A sub-Chandrasekhar exp...

  20. STORAGE RING CROSS-SECTION MEASUREMENTS FOR ELECTRON IMPACT SINGLE AND DOUBLE IONIZATION OF Fe{sup 9+} AND SINGLE IONIZATION OF Fe{sup 10+}

    SciTech Connect (OSTI)

    Hahn, M.; Novotny, O.; Savin, D. W. [Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027 (United States); Becker, A.; Grieser, M.; Krantz, C.; Wolf, A. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Lestinsky, M.; Repnow, R. [GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany); Mueller, A.; Schippers, S.; Spruck, K. [Institut fuer Atom- und Molekuelphysik, Justus-Liebig-Universitaet Giessen, Leihgesterner Weg 217, D-35392 Giessen (Germany)

    2012-11-20T23:59:59.000Z

    We have measured electron impact ionization from the ground state of Fe{sup 9+} and Fe{sup 10+} over the relative electron-ion collision energy ranges 200-1900 eV and 250-1800 eV, respectively. The ions were confined in an ion storage ring long enough for essentially all metastable levels to radiatively relax to the ground state. For single ionization, we find a number of discrepancies between the existing theoretical cross sections and our results. The calculations appear to neglect some excitation-autoionization (EA) channels, particularly from n = 3 to n' excitations, which are important near threshold, and those from n = 2 {yields} 3 excitations, which contribute at about 650 eV. Conversely, at higher energies the calculations appear to overestimate the importance of EA channels due to excitation into levels where n {>=} 4. The resulting experimental rate coefficients agree with the most recent theory for Fe{sup 9+} to within 16% and for Fe{sup 10+} to within 19% at temperatures where these ions are predicted to form in collisional ionization equilibrium. We have also measured double ionization of Fe{sup 9+} forming Fe{sup 11+} in the energy range 450-3000 eV and found that although there is an appreciable cross section for direct double ionization, the dominant mechanism appears to be through direct ionization of an inner shell electron producing an excited state that subsequently stabilizes through autoionization.

  1. Tuning exchange bias in Fe/?-Fe{sub 2}O{sub 3} core-shell nanoparticles: Impacts of interface and surface spins

    SciTech Connect (OSTI)

    Khurshid, Hafsa, E-mail: hkhurshi@usf.edu, E-mail: phanm@usf.edu, E-mail: sharihar@usf.edu; Phan, Manh-Huong, E-mail: hkhurshi@usf.edu, E-mail: phanm@usf.edu, E-mail: sharihar@usf.edu; Mukherjee, Pritish; Srikanth, Hariharan, E-mail: hkhurshi@usf.edu, E-mail: phanm@usf.edu, E-mail: sharihar@usf.edu [Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)

    2014-02-17T23:59:59.000Z

    A comparative study has been performed of the exchange bias (EB) effect in Fe/?-Fe{sub 2}O{sub 3} core-shell nanoparticles with the same thickness of the ?-Fe{sub 2}O{sub 3} shell (?2?nm) and the diameter of the Fe core varying from 4?nm to 11?nm. Transmission electron microscopy (TEM) and high-resolution TEM confirmed the high quality of the core-shell nanostructures. A systematic analysis of magnetization versus magnetic field measurements under zero-field-cooled and field-cooled regimes using the Meiklejohn-Bean model and deconvoluting superparamagnetic and paramagnetic contribution to the total magnetic moment Langevin function shows that there exists a critical particle size (?10?nm), above which the spins at the interface between Fe and ?-Fe{sub 2}O{sub 3} contribute primarily to the EB, but below which the surface spin effect is dominant. Our finding yields deeper insight into the collective contributions of interface and surface spins to the EB in core-shell nanoparticle systems, knowledge of which is the key to manipulating EB in magnetic nanostructures for spintronics applications.

  2. Controllable synthesis, magnetic and biocompatible properties of Fe{sub 3}O{sub 4} and {alpha}-Fe{sub 2}O{sub 3} nanocrystals

    SciTech Connect (OSTI)

    Zhou, Xi, E-mail: xizhou@xmu.edu.cn [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China)] [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China); Shi, Yanfeng; Ren, Lei [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China)] [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China); Bao, Shixiong [State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005 (China)] [State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005 (China); Han, Yu; Wu, Shichao; Zhang, Honggang; Zhong, Lubin [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China)] [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China); Zhang, Qiqing, E-mail: zhangqiq@xmu.edu.cn [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China)] [Research Center of Biomedical Engineering, Department of Biomaterials, College of Materials, The Key Laboratory of Biomedical Engineering of Fujian Province, Xiamen University, Xiamen, Fujian 361005 (China)

    2012-12-15T23:59:59.000Z

    Iron oxide nanocrystals (NCs) with a series of well-controlled morphologies (octahedron, rod, wire, cube and plate) and compositions (Fe{sub 3}O{sub 4} and {alpha}-Fe{sub 2}O{sub 3}) were synthesized via a facile hydrothermal process. The morphological and compositional control of various iron oxide NCs was based on the regulations of precursor thermolysis kinetics and surfactants. The obtained samples were characterized by XRD, SEM, TEM, SQUID and cytotoxicity test. These as-prepared iron oxide NCs showed excellent magnetic properties and good biocompatibility, paving the way for their high-efficiency bio-separation and bio-detection applications. - Graphical Abstract: Schematic illustration for the formation of iron oxide NCs (Fe{sub 3}O{sub 4} and {alpha}-Fe{sub 2}O{sub 3}) with different controlled morphologies and compositions. Highlights: Black-Right-Pointing-Pointer Iron oxide NCs with a series of well-controlled morphologies (octahedron, rod, wire, cube, and plate) and compositions (Fe{sub 3}O{sub 4} and {alpha}-Fe{sub 2}O{sub 3}) were synthesized via a facile hydrothermal method. Black-Right-Pointing-Pointer The mechanism of the morphological and compositional control process is directly related to precursor thermolysis kinetics and surfactants. Black-Right-Pointing-Pointer These iron oxide NCs exhibited excellent magnetic response and good biocompatibility, which should have great applications in the cell separation and biodetection.

  3. Microstructural investigations of rare-earth transition-metal...

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

    Corp. Temperature dependences of BH max Source: Prof. Oliver Gutfleisch, IFW Dresden, Germany Nd-Fe-B Sm-Co 2:17 Nd-Dy-Fe-B Ferrite The state of the art in terms of magnetic...

  4. Spreading of Sn-Ag solders on FeNi alloys

    SciTech Connect (OSTI)

    Saiz, Eduardo; Hwang, C-W.; Suganuma, Katsuaki; Tomsia, Antoni P.

    2003-02-28T23:59:59.000Z

    The spreading of Sn-3Ag-xBi solders on Fe-42Ni has been studied using a drop transfer setup. Initial spreading velocities as fast as {approx}0.5 m/s have been recorded. The results are consistent with a liquid front moving on a metastable, flat, unreacted substrate and can be described by using a modified molecular-kinetic model for which the rate controlling step is the movement of one atom from the liquid to the surface of the solid substrate. Although the phase diagram predicts the formation of two Fe-Sn intermetallics at the solder/substrate interface in samples heated at temperatures lower than 513 C, after spreading at 250 C only a thin FeSn reaction layer could be observed. Two interfacial layers (FeSn and FeSn2) were found after spreading at 450 C.

  5. Effects of temperature and pressure on phonons in FeSi1–xAlx

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

    Delaire, O.; Al-Qasir, I. I.; Ma, J.; dos Santos, A. M.; Sales, B. C.; Mauger, L.; Stone, M. B.; Abernathy, D. L.; Xiao, Y.; Somayazulu, M.

    2013-05-01T23:59:59.000Z

    The effects of temperature and pressure on phonons in B20 compounds FeSi1–xAlx were measured using inelastic neutron scattering and nuclear-resonant inelastic x-ray scattering. The effect of hole doping through Al substitution is compared to results of alloying with Co (electron doping) in Fe??xCoxSi. While the temperature dependence of phonons in FeSi is highly anomalous, doping with either type of carriers leads to a recovery of the normal quasiharmonic behavior. Density functional theory (DFT) computations of the electronic band structure and phonons were performed. The anomaly in the temperature dependence of the phonons in undoped FeSi was related to the narrow band gap, and its sensitivity to the effect of thermal disordering by phonons. On the other hand, the pressure dependence of phonons at room temperature in undoped FeSi follows the quasiharmonic behavior and is well reproduced by the DFT calculations.

  6. Intrinsic magnetic properties of hexagonal LuFeO{sub 3} and the effects of nonstoichiometry

    SciTech Connect (OSTI)

    Moyer, Jarrett A., E-mail: moyerja@illinois.edu, E-mail: schlom@cornell.edu; Schiffer, Peter [Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States); Misra, Rajiv [Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Mundy, Julia A. [School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States); Brooks, Charles M.; Heron, John T. [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States); Muller, David A. [School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853 (United States); Schlom, Darrell G., E-mail: moyerja@illinois.edu, E-mail: schlom@cornell.edu [Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853 (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853 (United States)

    2014-01-01T23:59:59.000Z

    We used oxide molecular-beam epitaxy in a composition-spread geometry to deposit hexagonal LuFeO{sub 3} (h-LuFeO{sub 3}) thin films with a monotonic variation in the Lu/Fe cation ratio, creating a mosaic of samples that ranged from iron rich to lutetium rich. We characterized the effects of composition variation with x-ray diffraction, atomic force microscopy, scanning transmission electron microscopy, and superconducting quantum interference device magnetometry. After identifying growth conditions leading to stoichiometric film growth, an additional sample was grown with a rotating sample stage. From this stoichiometric sample, we determined stoichiometric h-LuFeO{sub 3} to have a T{sub N} = 147 K and M{sub s} = 0.018 ?{sub B}/Fe.

  7. Growth of FePt encapsulated carbon nanotubes by thermal chemical vapor deposition

    SciTech Connect (OSTI)

    Fujiwara, Yuji, E-mail: fujiwara@phen.mie-u.ac.jp; Kaneko, Tetsuya; Hori, Kenta; Takase, Sho; Sato, Hideki; Maeda, Kohji; Kobayashi, Tadashi [Graduate School of Engineering, Mie University, Kurima-machiya-cho 1577, Tsu 514-8507 (Japan); Kato, Takeshi; Iwata, Satoshi [Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601 (Japan); Jimbo, Mutsuko [Department of Electrical and Electronic Engineering, Daido University, Takiharu-cho 10-3, Minami-ku, Nagoya 457-8530 (Japan)

    2014-03-15T23:59:59.000Z

    FePt encapsulated carbon nanotubes (CNTs) were grown by thermal chemical vapor deposition using an Fe/Pt bilayer catalyst. The CNTs were grown according to the base growth model. Selected area electron diffraction results revealed that the encapsulated particles were A1-FePt, L1{sub 0}-FePt, and Fe{sub 3}PtC. The crystal structures of particles found at the root parts of CNTs were not able to be identified, however. The layered structure of catalytic films seemed to be responsible for the difference in Pt content between particles found at tip and root parts of CNTs. Approximately 60% of CNTs grown at 800?°C had particles at their tip parts, compared to only 30% when the growth temperature was 700?°C, indicating that higher process temperatures promote particle encapsulation in CNTs.

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

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

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

    2015-02-01T23:59:59.000Z

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

  9. FePt-based exchange-coupled composite perpendicular recording media.

    SciTech Connect (OSTI)

    Sun, C.; Stafford, D.; Acharya, R.; X-Ray Science Division; Western Digital Media

    2010-06-01T23:59:59.000Z

    In order to demonstrate the strong and proper exchange coupling between bottom magnetic layer and capping magnetic layer in FePt-based exchange-coupled composite (ECC) perpendicular recording media, we have investigated the thermal stability, writability, degree of exchange coupling, and ECC gain factor of FePt-based ECC media as a function of the thickness of the capping FePt layer. With increasing the thickness of capping FePt layer, both thermal stability and media writability increase simultaneously as a result of the change from strong exchange coupling to proper exchange coupling. The proper exchange-coupled FePt ECC is a promising candidate for future high-density perpendicular recording.

  10. 9 T high magnetic field annealing effects on FeN bulk sample

    SciTech Connect (OSTI)

    Jiang, Yanfeng; Wang, Jian-Ping, E-mail: jpwang@umn.edu [Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minneota 55455 (United States); Dabade, Vivekanand; James, Richard D. [Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455 (United States); Brady, Michael P.; Rios, Orlando [Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831–6115 (United States)

    2014-05-07T23:59:59.000Z

    ??-Fe{sub 16}N{sub 2} has been suggested as a promising candidate for future rare-earth-free magnets. In this paper, we report to use high magnetic field (9?T) assisted post-annealing process to enhance the Fe{sub 16}N{sub 2} phase formation in FeN bulk rod samples during the ?? ? ?? phase transformation and thus improve its magnetic properties. It was found by X-ray Diffraction measurement that the volume ratio of Fe{sub 16}N{sub 2} phase was increased up to 22%, which corresponds to an increase in the amount of transformation from ?? ? ?? up to 78%. Also, the saturation magnetization (M{sub s}) of the prepared FeN rod sample was increased to 227?emu/g with its coercivity up to 376?Oe at room temperature. A working mechanism for the high field assisted post-annealing process was presented.

  11. Resolving the stellar sources of isotopically rare presolar silicate grains through Mg and Fe isotopic analyses

    SciTech Connect (OSTI)

    Nguyen, Ann N.; Messenger, Scott, E-mail: lan-anh.n.nguyen@nasa.gov [Robert M. Walker Laboratory for Space Science, Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, Houston, TX 77058 (United States)

    2014-04-01T23:59:59.000Z

    We conducted multi-element isotopic analyses of 11 presolar silicate grains from the Acfer 094 meteorite having unusual O isotopic compositions. Eight grains are {sup 18}O-rich, one is {sup 16}O-rich, and two are extremely {sup 17}O-rich. We constrained the grains' stellar sources by measuring their Si and Mg isotopic ratios, and also the {sup 54}Fe/{sup 56}Fe and {sup 57}Fe/{sup 56}Fe ratios for five grains. The Mg and Fe isotopic measurements were conducted after surrounding matrix grains were removed for more accurate ratios. Most of the {sup 18}O-rich silicates had anomalous Mg isotopic ratios, and their combined isotopic constraints are consistent with origins in low-mass Type II supernovae (SNe II) rather than high-metallicity stars. The isotopic ratios of the {sup 16}O-rich silicate are also consistent with an SN origin. Mixing small amounts of interior stellar material with the stellar envelope replicated all measured isotopic ratios except for {sup 29}Si/{sup 28}Si and {sup 54}Fe/{sup 56}Fe in some grains. The {sup 29}Si/{sup 28}Si ratios of all SN-derived grains are matched by doubling the {sup 29}Si yield in the Ne- and Si-burning zones. The {sup 54}Fe/{sup 56}Fe ratios of the grains imply elemental fractionation in the Si/S zone, or introduction of isotopically solar Fe by secondary processing. The two highly {sup 17}O-rich silicates exhibited significant {sup 25}Mg and/or {sup 26}Mg enrichments and their isotopic ratios are best explained by strong dilution of 1.15 M {sub ?} CO nova matter. We estimate that ?12% and 1% of presolar silicates have SN and nova origins, respectively, similar to presolar SiC and oxides. This implies that asymptotic giant branch stars are the dominant dust producers in the galaxy.

  12. Postirradiation deformation behavior in ferritic Fe-Cr alloys

    SciTech Connect (OSTI)

    Hamilton, M.L.; Gelles, D.S. [Pacific Northwest Lab., Richland, VA (United States); Gardner, P.L. [Univ. of Missouri, Rolla (United States)

    1992-12-31T23:59:59.000Z

    It has been demonstrated that fast neutron irradiation produces significant hardening in simple Fe(3-18)Cr binary alloys irradiated to about 35 dpa in the temperature range 365 to 420{degrees}C, whereas irradiation at 574{degrees}C produces hardening only for 15% or more chromium. The irradiation-induced changes in tensile properties are discussed in terms of changes in the power law work hardening exponent. The work hardening exponent of the lower chromium alloys decreased significantly after low temperature irradiation ({le}420{degrees}C) but increased after irradiation at 574{degrees}C. The higher chromium alloys failed either in cleavage or in a mixed ductile/brittle fashion. Deformation microstructures are presented to support the tensile behavior.

  13. Postirradiation deformation behavior in ferritic Fe-Cr alloys

    SciTech Connect (OSTI)

    Hamilton, M.L.; Gelles, D.S. [Pacific Northwest Lab., Richland, WA (United States); Gardner, P.L. [Missouri Univ., Rolla, MO (United States)

    1992-06-01T23:59:59.000Z

    It has been demonstrated that fast-neutron irradiation produces significant hardening in simple Fe-(3-18)Cr binary alloys irradiated to about 35 dpa in the temperature range 365 to 420{degrees}C, whereas irradiation at 574{degrees}C produces hardening only for 15% or more chromium. The irradiation-induced changes in tensile properties are discussed in terms of changes in the power law work-hardening exponent. The work-hardening exponent of the lower chromium alloys decreased significantly after low-temperature irradiation ({le} 420{degrees}C) but increased after irradiation at 574{degrees}C. The higher chromium alloys failed either in cleavage or in a mixed ductile/brittle fashion. Deformation microstructures are presented to support the tensile behavior.

  14. Postirradiation deformation behavior in ferritic Fe-Cr alloys

    SciTech Connect (OSTI)

    Hamilton, M.L.; Gelles, D.S. (Pacific Northwest Lab., Richland, WA (United States)); Gardner, P.L. (Missouri Univ., Rolla, MO (United States))

    1992-06-01T23:59:59.000Z

    It has been demonstrated that fast-neutron irradiation produces significant hardening in simple Fe-(3-18)Cr binary alloys irradiated to about 35 dpa in the temperature range 365 to 420[degrees]C, whereas irradiation at 574[degrees]C produces hardening only for 15% or more chromium. The irradiation-induced changes in tensile properties are discussed in terms of changes in the power law work-hardening exponent. The work-hardening exponent of the lower chromium alloys decreased significantly after low-temperature irradiation ([le] 420[degrees]C) but increased after irradiation at 574[degrees]C. The higher chromium alloys failed either in cleavage or in a mixed ductile/brittle fashion. Deformation microstructures are presented to support the tensile behavior.

  15. Fast Neutron Damage Studies on NdFeB Materials

    E-Print Network [OSTI]

    Spencer, James; Baldwin, A; Boussoufi, Moe; Pellet, David; Volk, James T; Wolf, Zachary

    2005-01-01T23:59:59.000Z

    Many materials and electronics need to be tested for the radiation environment expected at linear colliders (LC) where the accelerator and detectors will be subjected to large fluences of hadrons, leptons and gammas over the life of the facility. Although the linacs will be superconducting, there are still many potential uses for NdFeB in the damping rings, injection and extraction lines and final focus. Our understanding of the radiation damage situation for rare earth permanent magnet materials was presented at PAC2003 and our first measurements of fast neutron, stepped doses at the UC Davis McClellan Nuclear Reactor Center (UCD MNRC) were presented at EPAC2004 where the damage appeared proportional to the distances between the effective operating points and Hc. Here we have extended those doses and included more commercial samples together with the induced radioactivities associated with their respective dopants. Hall probe data for the external induction distributions are compared with vector magnetizatio...

  16. The Wide Field Spectrograph (WiFeS)

    E-Print Network [OSTI]

    Michael Dopita; John Hart; Peter McGregor; Patrick Oates; Gabe Bloxham; Damien Jones

    2007-05-02T23:59:59.000Z

    This paper describes the Wide Field Spectrograph (WiFeS) under construction at the Research School of Astronomy and Astrophysics (RSAA) of the Australian National University (ANU) for the ANU 2.3m telescope at the Siding Spring Observatory. WiFeS is a powerful integral field, double-beam, concentric, image-slicing spectrograph designed to deliver excellent thoughput, wavelength stability, spectrophotometric performance and superb image quality along with wide spectral coverage throughout the 320-950 nm wavelength region. It provides a 25x38 arcsec. field with 0.5 arcsec. sampling along each of twenty five 38X1 arcsec slitlets. The output format is optimized to match the 4096x4096 pixel CCD detectors in each of two cameras individually optimized for the blue and the red ends of the spectrum, respectively. A process of "interleaved nod-and-shuffle" will be applied to permit quantum noise-limited sky subtraction. Using VPH gratings, spectral resolutions of 3000 and 7000 are provided. The full spectral range is covered in a single exposure at R=3000, and in two exposures in the R=7000 mode. The use of transmissive coated optics, VPH gratings and optimized mirror coatings ensures a throughput (including telescope atmosphere and detector) > 30% over a wide spectral range. The concentric image-slicer design ensures an excellent and uniform image quality across the full field. To maximize scientific return, the whole instrument is configured for remote observing, pipeline data reduction, and the accumulation of calibration image libraries.

  17. Mossbauer spectroscopic and x-ray diffraction studies of FeSiO2 nanocomposite soft magnetic materials

    E-Print Network [OSTI]

    Yang, De-Ping

    Mo¨ssbauer spectroscopic and x-ray diffraction studies of FeÕSiO2 nanocomposite soft magnetic. The compositions of the precursor and the successive heat-treated samples have been investigated by 57 Fe Mo¨ssbauer a synthesis of Fe/SiO2 nanocomposites and a study of their magnetic and structural properties using Mo¨ssbauer

  18. SPIN DENSITY OF THE CANTED MOMENT IN 03B1-Fe2O3 (1) By S. J. PICKART,

    E-Print Network [OSTI]

    Boyer, Edmond

    avec des neutrons polarisés. On trouve que cette densité diffère de celle de l'ion Fe3+. Abstract. 2014 neutrons and found to differ from that of the Fe3+ ion. LE JOURNAL DE PHYSIQUE TOME 25, MAI 1964, as established by the original neutron diffraction measurements [3], consists of the Fe3 ~ spins in each (111

  19. Phase equilibria of an Al0.5CrFeCoNiCu High Entropy Alloy

    E-Print Network [OSTI]

    Jones, N. G.; Frezza, A.; Stone, H. J.

    2014-07-27T23:59:59.000Z

    /Co/Fe with Cr exhibit multiphase regions, the solubility of Cr in each Ni/Co/Fe binary solid solutions at elevated temperatures is always significant [22,34–36]. The Fig. 4. BSEI micrographs of Al0.5CrFeCoNiCu following 1000 h heat treatment at (a) 700 1C, (b...

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

    E-Print Network [OSTI]

    de Lima, Oscar Ferreira

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