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Monazite structure from dehydrated CaSeO4·2H2O

Published online by Cambridge University Press:  05 July 2018

W. A. Crichton ,
H. Müller ,
M. Merlini ,
T. Roth  and
C. Detlefs
W. A. Crichton*
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
H. Müller
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
M. Merlini
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France Dipartimento di Scienze della Terra “Ardito Desio”, Università degli Studi di Milano, via Mangiagalli 34, 20133 Milano, Italy
T. Roth
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
C. Detlefs
Affiliation:
European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
*
*E-mail: crichton@esrf.fr
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Abstract

The structure of the high-temperature form of CaSeO4, formed by dehydration of the gyspum-type structure dihydrate is presented. The material is equivalent to that described previously as a P212121 form, but is however, a monazite with unit cell a = 6.85661(16) Å, b = 7.04962(15) Å, c = 6.68817(15) Å and β = 104.2675(21)° in space group P121/n1. Also presented is evidence for two intermediate trigonal and pseudo-trigonal phases related to the structurally similar minerals rhabdophane, bassanite, and γ-CaSO4. This result permits closer comparisons between intermediate-temperature structures of the selenate with related sulphates, and orthophosphates with a view to extending structural stability via synthesis of solid-solutions.

Keywords

diffractionsynthesisgypsummonazite
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 1 , February 2010 , pp. 127 - 139
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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