Effect of oxygen on the microstructure and hydrogen storage properties of V–Ti–Cr–Fe quaternary solid solutions |
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| Affiliation: | 1. Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, P.O. Box 3640, D-76021 Karlsruhe, Germany;2. National Institute of Advanced Industrial Science and Technology (AIST), AIST Central-5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan;3. Karlsruhe Institute of Technology (KIT), Institute of Applied Materials, P.O. Box 3640, D-76021 Karlsruhe, Germany;4. Karlsruhe Institute of Technology (KIT), Helmholtz Institute Ulm for Electrochemical Energy Storage, Helmhotzstr. 11, 89081 Ulm, Germany;5. Karlsruhe Nano Micro Facility, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;6. Karlsruhe Institute of Technology (KIT), Institute of Micro Process Engineering, P.O. Box 3640, D-76021 Karlsruhe, Germany;1. CNRS, Insitut NEEL, F-38042 Grenoble, France;2. Université Grenoble Alpes, Inst. NEEL, F-38042 Grenoble, France;3. ID15, ESRF, 6 rue Jules Horowitz, 38043 Grenoble, France;4. Université Claude Bernard Lyon 1, LMI – UMR CNRS N° 5615, 43 Bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France;1. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;1. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa;2. African Materials Science and Engineering Network (AMSEN), University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa;3. Materials for Energy Research Group (MERG), University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa;4. DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa |
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| Abstract: | The effect of low (<300 ppm O) and high (10,000 ppm O) residual oxygen concentration in vanadium raw metals on the microstructure and hydrogenation properties of V40Fe8Ti26Cr26, was investigated by means of XRD, SEM, TEM and pressure-composition isotherms. A high oxygen concentration in the vanadium raw metal led to the formation of an oxygen-rich secondary phase isostructural with α-Ti. The lattice parameter of the BCC main phase of the high-oxygen sample was reduced to 3.0141 (3) Å compared to 3.0308 (2) Å for the low-oxygen sample. As a result of the high oxygen content the equilibrium hydrogen pressure of the material was increased from 1 MPa to 4 MPa. Deoxidization through the addition of 1 at% rare earth metal could be achieved. The lattice constant of the deoxidized sample was 3.0297 (3) Å, and the thermodynamic properties were also the same as in case of the low-oxygen sample. |
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| Keywords: | BCC alloys Hydrogen storage Oxygen effect |
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