The dynamic properties of lithium oxide investigated by neutron scattering techniques
1988; Elsevier BV; Volume: 28-30; Linguagem: Inglês
10.1016/s0167-2738(88)80031-6
ISSN1872-7689
AutoresT.W.D. Farley, W. Hayes, S. Hull, R. C. C. Ward, M. T. Hutchings, M. Alba,
Tópico(s)Solid-state spectroscopy and crystallography
ResumoThe lattice dynamics and thermally induced lattice disorder in the antifucrite compound 7Li2O have been studied by inelastic neutron scattering from single-crystal samples. The measured phonon energy dispersion relation can be well accounted for by a shell model of the atomic interactions, and the elastic constants are determined for the first time. No cohenrent diffuse scattering has yet been observed from single crystals at temperatures up to close to the melting point, but incoherent quasielastic scattering observed at low scattering vectors at 1623 K gives an estimate of the mean residence time of the Li+ ions as 3.7 ps.
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