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Mineralogical Magazine; June 2000; v. 64; no. 3; p. 569-576
© 2000 Mineralogical Society of Great Britain and Ireland
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Letter

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

M. T. Dove1,*, M. S. Craig1, D. A. Keen2, W. G. Marshall2, S. A. T. Redfern1, K. O. Trachenko1 and M. G. Tucker1

1 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
2 ISIS Facility, Rutherford Appleton Laboratory, CLRC, Chilton, Didcot, Oxfordshire OX11 0QX, UK

* E-mail: martin{at}esc.cam.ac.uk

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, ß = 124.949(7)°, at P = 3.5 GPa). This phase corresponds to a distortion of the high-temperature cubic ß-phase, rather than of the ambient temperature and pressure tetragonal {alpha}-phase.

KEYWORDS: cristobalite, high-pressure, neutron diffraction, phase transitions




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