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A detailed structural characterization of quartz on heating through the α–β phase transition

Published online by Cambridge University Press:  05 July 2018

M. G. Tucker ,
D. A. Keen  and
M. T. Dove
M. G. Tucker
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
D. A. Keen
Affiliation:
ISIS Faculty, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
M. T. Dove*
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
*
*E-mail: [email protected]
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Abstract

Total neutron scattering measurements, analysed using a modification of the reverse Monte Carlo modelling method to account for long-range crystallographic order, have been used to describe the temperature-dependent behaviour of the structure of quartz. Two key observations are reported. First, the symmetry change associated with the displacive α–β phase transition is observed in both the long-range and short-range structural correlations. Secondly, some aspects of the structure, such as the Si–O bond length and the thermally-induced dynamic disorder, the latter of which sets in significantly below the transition, are relatively insensitive to the phase transition. These results are used to show that the α-domain model of the β-phase disorder is inappropriate and that the classical soft-mode picture of the phase transition is too simplistic. Instead, it is argued that the structural behaviour is best described in terms of its ability to respond to low-frequency, high-amplitude vibrational modes. This view is supported by additional single-crystal diffuse neutron scattering measurements.

Keywords

structural characterizationquartzα–β transition, total neutron scatteringreverse Monte Carlo modelling
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 4 , August 2001 , pp. 489 - 507
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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Footnotes

†

Present address: Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK

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