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The crystal structure of russellite; a re-determination using neutron powder diffraction of synthetic Bi2WO6

Published online by Cambridge University Press:  05 July 2018

Kevin S. Knight
Kevin S. Knight*
Affiliation:
ISIS Science Division, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX12 0QX
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Abstract

The crystal structure of the displacive ferroelectric mineral russellite, Bi2WO6, has been determined using Rietveld profile refinement of high-resolution, time of flight, neutron powder diffraction data on the synthetic compound. Russellite is orthorhombic, Pca21, with a 5.43726(2) Å, b 16.43018(5) Å, c 5.458422) Å, Z = 4 and is isostructural with the bismuth molybdate mineral koechlinite, Bi2MoO6. The structure consists of layers of tilted WO6 octahedra sandwiched between layers of bismuth and oxygen with the tungsten displaced from the centre of the octahedron by 0.278 Å. The orientations of the lone-pair electrons in the Bi3+ cations have been inferred from the 3.0 Å coordination shells of both crystallographically independent bismuths, and have been found to be non-centrosymmetric, an effect which may give rise to the tilting of the WO6 octahedra. New laboratory source X-ray powder diffraction data are presented for russellite, which, with supplementary synchrotron powder diffractometry, corroborate the new space group and structure determination.

Keywords

russellitecrystal structureRietveld analysisneutron diffraction
Type
Crystal Structures
Information
Mineralogical Magazine , Volume 56 , Issue 384 , September 1992 , pp. 399 - 409
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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