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High-temperature synchrotron X-ray powder diffraction study of Cs2XSi5O12(X = Cd, Cu, Zn) leucites

Published online by Cambridge University Press:  05 July 2018

A. M. T. Bell  and
C. M. B. Henderson
A. M. T. Bell*
Affiliation:
HASYLAB/DESY, Notkestraβe 85, 22607 Hamburg, Germany
C. M. B. Henderson
Affiliation:
SEAES, University of Manchester, Manchester M13 9PL, UK ASTeC, Science and Technology Facilities Council (STFC) Laboratory, Daresbury WA4 4AD, UK
*
*E-mail: [email protected]
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Abstract

Synchrotron X-ray powder diffraction data have been collected on three synthetic leucite analogues with the general formula Cs2XSi5O12(X = Cd, Cu, Zn) between 295 and 1173 K. All three samples have the orthorhombic Pbca leucite structure at room temperature with ordered framework T-site cations. The sample with X = Cd retains the Pbca structure over the whole of the investigated temperature range. The sample with X = Cu also retains the Pbca structure, but there is a transition to a less distorted structure with a larger unit-cell volume at ∼333 K. The sample with X = Zn shows evidence for a transition to a previously unknown Pa cubic structure, with some T-site cation disorder, at 566 K, on heating. This transition is reversible on cooling to 633 K.

Keywords

mineral chemistryphase transitionsRietveld refinementleucitessynchrotron X-ray powder diffraction
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 5 , October 2012 , pp. 1257 - 1280
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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