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The low-temperature behaviour of analcime. 1: high-resolution neutron powder diffraction

Published online by Cambridge University Press:  05 July 2018

C. M. B. Line ,
M. T. Dove ,
K. S. Knight  and
B. Winkler
C. M. B. Line
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
M. T. Dove
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
K. S. Knight
Affiliation:
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
B. Winkler
Affiliation:
Mineralogisch-Petrographisches Institut der Christian Albrechts, Universität, Olshausenstr. 40, D-24098 Kiel, Germany
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Abstract

The structure of a synthetic sample of analcime has been determined as a function of temperature between 30–300 K by high-resolution neutron powder diffraction. Although there are some reports of samples of analcime having non-cubic structures, the sample in our experiments remained cubic (space group la3d), and hence disordered, down to low temperatures. The absence of phase transitions involving ordering of the orientations of the water molecules, ordering of the sodium positions, or a displacive instability as in leucite and related materials, is discussed. We speculate that part of the reason for the absence of ordering of the water molecules or sodium cations is associated with the Al/Si disorder, which cannot order at low temperatures. We also discuss the likely distribution of the orientations of the water molecules at low temperatures, and propose that the water diads lie close to any of the crystal diads with the H-H Vectors lying close to the triads.

Keywords

analcimeneutron diffractionlow-temperature behaviour
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 400 , June 1996 , pp. 499 - 507
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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Footnotes

*

Present address: Institut Laue Langevin, BP 156, 38042 Grenoble Cedex 9, France

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