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European Journal of Mineralogy GSW 2008 Users' Group Meeting
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European Journal of Mineralogy; June 2001; v. 13; no. 3; p. 479-484; DOI: 10.1127/0935-1221/2001/0013-0479
© 2001 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Direct transition from cristobalite to post-stishovite {alpha}-PbO2-like silica phase

Natalia A. DUBROVINSKAIA1,*, Leonid S. DUBROVINSKY1, Surendra K. SAXENA1, Faramaz TUTTI1, Sandeep REKHI1 and Tristan LE BIHAN2

1 Department of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden
2 European Synchrotron Radiation Facility, Grenoble 38043, France

* e-mail: Natalia.Dubrovinskaia{at}geo.uu.se

This paper was presented at the EMPG VIII meeting in Bergamo, Italy (April 2000)

In situ, x-ray studies in diamond anvil cells at pressures over 80 GPa were used to determine a stable silica phase at extreme conditions. We demonstrate that so far unidentified phases obtained on compression of {alpha}-cristobalite and a new dense silica polymorph discovered in the Martian meteorite Shergotty is the {alpha}-PbO2-type silica.

Key-words: silica, {alpha}-cristobalite, phase transition, diamond anvil cell, high-pressure phase.




This article has been cited by other articles:


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A. El Goresy, P. Dera, T. G. Sharp, C. T. Prewitt, M. Chen, L. Dubrovinsky, B. Wopenka, N. Z. Boctor, and R. J. Hemley
Seifertite, a dense orthorhombic polymorph of silica from the Martian meteorites Shergotty and Zagami
European Journal of Mineralogy, August 1, 2008; 20(4): 523 - 528.
[Abstract] [Full Text] [PDF]

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 American MineralogistHome page
P. Dera, C. T. Prewitt, N. Z. Boctor, and R. J. Hemley
Characterization of a high-pressure phase of silica from the Martian meteorite Shergotty
American Mineralogist, July 1, 2002; 87(7): 1018 - 1023.
[Abstract] [Full Text] [PDF]


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