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Phase transition, thermal expansion and electrical properties of BiCu2VO6

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Author(s)

I R Evans, S W Tao, J T S Irvine

School/Research organisations

Abstract

Phase transition in BiCU2VO6 has been studied by variable temperature powder and single crystal X-ray diffraction. A reversible siiigle-crystal-to-single-crystaI phase transition has been identified and the high-temperature beta-BiCu2VO6 polymorph structurally characterized. beta-BiCu2VO6 is monoclinic 1-centered and related to the alpha-form by a subgroup-supergroup relationship. Bi atoms are coordinated to oxygen so as to give rise to (BiO2)(-) chains parallel to the c-axis. The magnetic Cu-O sublattice forms a complex system of quasi one-diniensional 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 VO4 tetrahedral group. AC impedance measurements suggest predominantly electronic conduction in this material. (c) 2005 Elsevier Inc. All rights reserved.

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Details

Original languageEnglish
Pages (from-to)2927-2933
Number of pages7
JournalJournal of Solid State Chemistry
Volume178
DOIs
Publication statusPublished - Sep 2005

    Research areas

  • phase transitions, VANADATE

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