Volume 51, Number 2, July 2000
|Page(s)||140 - 146|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Anisotropy in the inelastic neutron scattering from fcc NiH
Institute of Solid State Physics RAS -
142432 Chernogolovka, Moscow district, Russia
2 Physik-Department E 15, Technische Universität München D-85747 Garching, Germany
3 Institut Laue-Langevin - BP 156, 38042 Grenoble Cedex 9, France
Accepted: 19 May 2000
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  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.
PACS: 61.12.-q – Neutron diffraction and scattering / 63.20.Dj – Phonon states and bands, normal modes, and phonon dispersion / 63.20.Ry – Anharmonic lattice modes
© EDP Sciences, 2000
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