| Issue |
Europhys. Lett.
Volume 51, Number 2, July 2000
|
|
|---|---|---|
| Page(s) | 140 - 146 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00523-2 | |
| Published online | 01 September 2002 | |
Anisotropy in the inelastic neutron scattering from fcc NiH
1
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
Received:
17
January
2000
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 [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.
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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