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Crystal structure of the high-pressure monoclinic phase-II of cristobalite, SiO2

Published online by Cambridge University Press:  05 July 2018

M. T. Dove ,
M. S. Craig ,
D. A. Keen ,
W. G. Marshall ,
S. A. T. Redfern ,
K. O. Trachenko  and
M. G. Tucker
M. T. Dove*
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
M. S. Craig
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
D. A. Keen
Affiliation:
ISIS Facility, Rutherford Appleton Laboratory, CLRC, Chilton, Didcot, Oxfordshire OX11 0QX, UK
W. G. Marshall
Affiliation:
ISIS Facility, Rutherford Appleton Laboratory, CLRC, Chilton, Didcot, Oxfordshire OX11 0QX, UK
S. A. T. Redfern
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
K. O. Trachenko
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
M. G. Tucker
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
*
* E-mail: martin@esc.cam.ac.uk
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Abstract

The crystal structure of the high-pressure phase-II of cristobalite has been solved by neutron diffraction (space group P21/c, a = 8.3780(11) Å, b = 4.6018(6) Å, c = 9.0568(13) Å, β = 124.949(7)°, at P = 3.5 GPa). This phase corresponds to a distortion of the high-temperature cubic β-phase, rather than of the ambient temperature and pressure tetragonal α-phase.

Keywords

cristobalitehigh-pressureneutron diffractionphase transitions
Type
Letters
Information
Mineralogical Magazine , Volume 64 , Issue 3 , June 2000 , pp. 569 - 576
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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