Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/1471
Title: Diffuse scattering and lattice dynamics of superionic copper chalcogenides
Authors: Danilkin, SA
Keywords: Crystal structure
Diffuse scattering
Chalcogenides
Neutron diffraction
Diffusion
Lattice parameters
Issue Date: 14-May-2009
Publisher: Elsevier
Citation: Danilkin, 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.2008.06.012
Abstract: The 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.
Gov't Doc #: 1492
URI: http://dx.doi.org/10.1016/j.ssi.2008.06.012
http://apo.ansto.gov.au/dspace/handle/10238/1471
ISSN: 0167-2738
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.