Phonon dispersion curves by inelastic neutron scattering to 12 Gpa
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S. Klotz
Abstract
Recent progress in high pressure techniques allows the measurements of phonon dispersion curves to ~12 GPa by inelastic neutron scattering on triple axis spec-trometers. Provided the structure is not too complex, a vari-ety of low-compressibility solids may be studied over the entire stability range of their ambient pressure forms. This article reviews results obtained during the last five years on the lattice dynamics of a number of “simple” systems (Ge, GaSb, PbTe, FeO, Zn, Fe) where the pressure-induced frequency shifts of the acoustic branches have been studied in considerable detail. In several of these solids pronounced “mode softening” is found under pressure. Grüneisen parameters and elastic constants have been determined and the results were compared to predictions of first-principle calculations.
© 2001 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- In situ structure solution of helical sulphur at 3GPa and 400ºC
- Phonon dispersion curves by inelastic neutron scattering to 12 Gpa
- Self-intersecting three-periodic minimal surfaces forming one-periodic tubes or finite polyhedra
- The crystal structure of FeInGe2O7
- Crystal structure of kristiansenite: a case of class IIB twinning by metric merohedry
- The crystal structures of phenacite-type Li2(MoO4), and scheelite-type LiY(MoO4)2 and LiNd(MoO4)2
- A synchrotron X-ray diffraction analysis of near-stoichiometric LiNbO3
- Polymorphism and multiple twinning of (Et4N)2ZnCl4
- Prediction of crystal structure of a rare monosaccharide – influence of model geometry
