Neutron diffraction study of diffuse scattering in Cu2−δSe superionic compounds

Simple item page
dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorSakuma, Ten_AU
dc.contributor.authorMacquart, RBen_AU
dc.contributor.authorLing, CDen_AU
dc.date.accessioned2011-09-15T01:04:02Zen_AU
dc.date.available2011-09-15T01:04:02Zen_AU
dc.date.issued2011-05-05en_AU
dc.date.statistics2011-09-15en_AU
dc.description.abstractCrystal structure and short-range order in Cu2-delta Se compounds were studied in superionic and non-superionic phases using high-resolution neutron diffractometer Echidna at ANSTO. In diffraction patterns of beta-Cu-1.98 Se (ordered phase at ambient T), both Bragg peaks and diffuse background change sharply through the beta -> alpha structural phase transition at T = 414K during heating. In case of alpha-Cu1.75Se (disordered superionic phase at ambient T) the changes are monotonic, showing gradual shifts of Bragg peaks and increased intensity of the diffuse background as a function of temperature. On cooling, both compounds undergo a beta -> beta ' transformation. Diffuse scattering in the alpha-phase shows an oscillating dependence on wavevector, with broad peaks centred at Q similar to 3, 5.5 and 8 angstrom(-1). The measurements taken in energy dispersive mode show that the oscillating diffuse background arises from correlated thermal displacements of the ions. Diffuse scattering is higher for compositions close to stoichiometry and increases with temperature. Theoretical calculations show that the increase in diffuse intensity both with temperature and Cu content is related to correlated thermal vibrations of Se and Cu atoms, with Se-Cu(8c, 32f) and Cu(8c)-Cu(8c) correlations being the most important. (C) 2011 Elsevier B.V.en_AU
dc.identifier.citationDanilkin, S.A., Avdeev, M., Sakuma, T., Macquart, R., Ling, C.D. (2011). Neutron diffraction study of diffuse scattering in Cu2−δSe superionic compounds. Journal of Alloys and Compounds, 509(18), 5460-5465. doi:10.1016/j.jallcom.2011.02.101en_AU
dc.identifier.govdoc3416en_AU
dc.identifier.issn0925-8388en_AU
dc.identifier.issue18en_AU
dc.identifier.journaltitleJournal of Alloys and Compoundsen_AU
dc.identifier.pagination5460-5465en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jallcom.2011.02.101en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3737en_AU
dc.identifier.volume509en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectIonic conductivityen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectInorganic compoundsen_AU
dc.subjectBragg curveen_AU
dc.subjectANSTOen_AU
dc.subjectDiffuse scatteringen_AU
dc.titleNeutron diffraction study of diffuse scattering in Cu2−δSe superionic compoundsen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles