Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.591-594
© 2011 The Japan Institute of Metals

Hydrogen Vibrational Excitation Spectra of CaF2-Type Metal Hydrides Synthesized from Ti-Based BCC Solid Solution Alloys

Yumiko Nakamura1, Takashi Kamiyama2 and Etsuo Akiba1

1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
2Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan

Hydrogen vibrational excitation was studied for CaF2-type metal hydrides synthesized from Ti-based BCC solid solution alloys using inelastic incoherent neutron scattering (IINS). Ti1.0V1.1Mn0.9H4.5 and Ti0.7V1.2Cr1.1H4.8 showed IINS spectra similar to that reported for TiH2. The first three peaks were isolated but the higher excitation peaks were not clear. Analysis of the spectra using curve-fitting with Gauss functions revealed that the hydrogen vibration of Ti1.0V1.1Mn0.9H4.5 is harmonic but that of the Ti0.7V1.2Cr1.1H4.8 is deviated from harmonic, which reflects a trumpet-type potential. The relation between metal-hydrogen distance and vibrational excitation energy for the above two hydrides and Ti1.1Cr1.4Mo0.3H∼ 5 was compared with a series of CaF2-type binary metal hydrides. All the hydrides of the Ti-based alloys had lower vibrational excitation energies than the binary metal hydrides for the corresponding metal-hydrogen distances.

(Received 2010/10/13; Accepted 2010/11/26; Published 2011/4/1)

Keywords: hydrogen storage, BCC solid solution alloy, CaF2 structure, vibration, inelastic neutron scattering

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