Diffuse scattering and lattice dynamics of superionic copper chalcogenides

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dc.contributor.authorDanilkin, SAen_AU
dc.date.accessioned2009-07-07T04:55:08Zen_AU
dc.date.accessioned2010-04-30T05:07:40Zen_AU
dc.date.available2009-07-07T04:55:08Zen_AU
dc.date.available2010-04-30T05:07:40Zen_AU
dc.date.issued2009-05-14en_AU
dc.date.statistics2009-05-14en_AU
dc.description.abstractThe energy-resolved neutron diffraction and inelastic neutron scattering study of diffuse scattering in copper chalcogenides was performed in order to clarify the role of static disorder versus low-energy phonons. Neutron diffraction patterns taken from Cu1.75Se, Cu1.98Se and Ag0.25Cu1.75Se powders in superionic phase show a broad maximum related to diffuse scattering. This diffuse background is suppressed in the energy-resolved experiment which indicates a strong contribution from inelastic scattering coming from correlated thermal displacements of the ions in the superionic phase. Diffraction experiments on a single crystal of α-Cu1.8Se have revealed an ordered structure with superstructure reflections at the G +/- 1/2 < 111 > and G +/- 1/3 < 220 > positions of reciprocal space at room temperature. In addition to superstructure spots, diffuse scattering was observed along the < 111 > direction which is considered as a possible diffusion path of mobile Cu ions. In inelastic neutron scattering measurements with this single crystal sample strong inelastic scattering was observed along < 111 >. This shows that the diffuse scattering found in conventional diffraction experiment is mainly inelastic and most probably comes from low-energy phonons. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationDanilkin, S. A. (2009). Diffuse scattering and lattice dynamics of superionic copper chalcogenides. Solid State Ionics, 180(6-8), 483-487. doi:10.1016/j.ssi.2008.06.012en_AU
dc.identifier.govdoc1492en_AU
dc.identifier.issn0167-2738en_AU
dc.identifier.issue6-8en_AU
dc.identifier.journaltitleSolid State Ionicsen_AU
dc.identifier.pagination483-487en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ssi.2008.06.012en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1471en_AU
dc.identifier.volume180en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCrystal structureen_AU
dc.subjectDiffuse scatteringen_AU
dc.subjectChalcogenidesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectDiffusionen_AU
dc.subjectLattice parametersen_AU
dc.titleDiffuse scattering and lattice dynamics of superionic copper chalcogenidesen_AU
dc.typeJournal Articleen_AU
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