Deuterium absorption properties of V85Ni15 and evidence of isotope effect |
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| Affiliation: | 1. CNR-ISC, U.O.S. Sapienza, Piazzale A. Moro 5, 00185, Roma, Italy;2. Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185, Roma, Italy;3. Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, 00044, Frascati, (RM), Italy;1. Department of Nuclear Science and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Shaanxi Key Lab. of Advanced Nuclear Energy and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China;2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing, 400044, China;3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China;1. Science and Technology Institute, Federal University of São Paulo, São José dos Campos, SP, Brazil;2. Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, Brazil;3. Grenoble Alpes University, CNRS, LEPMI, F-38000 Grenoble, France;1. Dipartimento Energia “Galileo Ferraris” – Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, TO, Italy;2. ENEA FSN-ING-QMN – C.R. Brasimone, Località Brasimone, 40032 Camugnano, BO, Italy;1. Karlsruhe Institute of Technology, Institute for Technical Physics, Tritium Laboratory Karlsruhe, Hermann-von-Helmholtz Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany;2. BioIS, Biosystems & Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal;3. ENEA, C. R. ENEA Frascati, Via E. Fermi 45, 00044, Frascati, RM, Italy;1. Shizuoka University, 836, Ohya, Suruga-ku, Shizuoka, 422-8529, Japan;2. The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan;3. Max-Planck-Institut für Plasmaphysik, D-85748, Garching, Germany;4. National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu, 509-5292, Japan |
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| Abstract: | The pressure-composition absorption isotherms of deuterium in an alloy with nominal composition V85Ni15 were measured between 87 and 400 °C for pressures up to ≈17 bar. For T ≤ 144 °C one observes the occurrence of a solid solution α phase for D/M < 0.15, the coexistence of α and β phase up to D/M ≈ 0.5 and a subsequent change to a different phase for higher deuterium concentrations. For temperatures higher than 200 °C only a solid solution with a deuteration enthalpy ΔHdeutr = 47 ± 2 kJ/mol is detected. The critical temperature of this V-Ni alloy (144 °C ≤ T*≤200 °C) is much higher than that of pure V (100 °C). Moreover, well above the critical temperature, one can observe a “normal” isotope effect, i.e. the equilibrium pressure of the V85Ni15-H system is higher than that of V85Ni15-D. |
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| Keywords: | V-Ni alloys Deuterium absorption Solid solution Deuteride Deuteration enthalpy |
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