Phase transition, thermal expansion and electrical properties of BiCu{sub 2}VO{sub 6}
- Department of Chemistry, University of Durham, Science Site, South Road, Durham DH1 3LE (United Kingdom)
- School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom)
Phase transition in BiCu{sub 2}VO{sub 6} has been studied by variable temperature powder and single crystal X-ray diffraction. A reversible single-crystal-to-single-crystal phase transition has been identified and the high-temperature {beta}-BiCu{sub 2}VO{sub 6} polymorph structurally characterized. {beta}-BiCu{sub 2}VO{sub 6} is monoclinic I-centered and related to the {alpha}-form by a subgroup-supergroup relationship. Bi atoms are coordinated to oxygen so as to give rise to (BiO{sub 2}){sup -} chains parallel to the c-axis. The magnetic Cu-O sublattice forms a complex system of quasi one-dimensional ladders, built up by five- and six-coordinate Cu atoms. Dynamic disorder in the high temperature structure can be described in terms of librational motion of VO{sub 4} tetrahedral group. AC impedance measurements suggest predominantly electronic conduction in this material. -- Graphical abstract:.
- OSTI ID:
- 20729103
- Journal Information:
- Journal of Solid State Chemistry, Vol. 178, Issue 9; Other Information: DOI: 10.1016/j.jssc.2005.07.006; PII: S0022-4596(05)00308-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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