Structure and oxide ion conductivity in Bi28Re2O49, a new bismuth rhenium oxide containing tetrahedral and octahedral Re(VII)

T. E. Crumpton; J. F. W. Mosselmans; C. Greaves

doi:10.1039/B412108M

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Structure and oxide ion conductivity in Bi₂₈Re₂O₄₉, a new bismuth rhenium oxide containing tetrahedral and octahedral Re(vii)

T. E. Crumpton,^a J. F. W. Mosselmans^b and C. Greaves*^a

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* Corresponding authors

^a School of Chemistry, University of Birmingham, Birmingham, UK
E-mail: c.greaves@bham.ac.uk

^b CCLRC, Daresbury Laboratory, Warrington, UK

Abstract

A new Bi–Re–O phase, Bi₂₈Re₂O₄₉, has been synthesized and characterized. Its structure, determined by neutron powder diffraction, is a superstructure of the cubic fluorite unit cell: tetragonal, I4/m, a = 8.7216(1) Å, c = 17.4177(2) Å. The structure comprises an ordered framework of linked BiO₄e trigonal bipyramids and square pyramids (e = lone pair of electrons), with discrete Re oxoanions at the origin and body-centre of the unit cell. The infra-red spectrum and Re K-edge X-ray absorption spectrum were consistent with the presence of tetrahedral ReO₄⁻ and octahedral ReO₆⁵⁻ species in the ratio of 3 : 1. This correctly provides charge balance in the overall structure. The phase is found to display high oxide ion conductivity, which may relate to the presence of the two different oxoanion species, and possible migration of O²⁻ ions between them.

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Article information

DOI: https://doi.org/10.1039/B412108M
Article type: Paper
Submitted: 05 Aug 2004
Accepted: 18 Oct 2004
First published: 10 Nov 2004

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J. Mater. Chem., 2005,15, 164-167

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Structure and oxide ion conductivity in Bi₂₈Re₂O₄₉, a new bismuth rhenium oxide containing tetrahedral and octahedral Re(VII)

T. E. Crumpton, J. F. W. Mosselmans and C. Greaves, J. Mater. Chem., 2005, 15, 164 DOI: 10.1039/B412108M

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Journal of Materials Chemistry