Anisotropy in the inelastic neutron scattering from fcc NiH

A sample of nearly stoichiometric fcc nickel hydride in the form of polycrystalline plates with strong texture was studied by inelastic neutron scattering (INS) in two different orientations, with the [100] axis of the texture parallel and at an angle of 45° to the direction of neutron momentum tran...

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Bibliographic Details
Published in:Europhysics letters 2000-07, Vol.51 (2), p.140-146
Main Authors: Antonov, V. E, Fedotov, V. K, Gnesin, B. A, Grosse, G, Ivanov, A. S, Kolesnikov, A. I, Wagner, F. E
Format: Article
Language:English
Subjects:
61.12.-q
63.20.Dj
63.20.Ry
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Summary:A sample of nearly stoichiometric fcc nickel hydride in the form of polycrystalline plates with strong texture was studied by inelastic neutron scattering (INS) in two different orientations, with the [100] axis of the texture parallel and at an angle of 45° to the direction of neutron momentum transfer. The INS spectra were measured at 5 K with energy transfers ω ranging from 26 to 380 meV. In the region of the second and third band of optical hydrogen vibrations, they showed a significant directional dependence. A similar anisotropy was recently observed in the INS spectrum of fcc palladium hydride, and the now available data for NiH and PdH are discussed together.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2000-00523-2