Abstract
A Rietveld structural analysis of stishovite, with angle-dispersive x-ray diffraction synchrotron source at the European Synchrotron Radiation Facility, confirmed a CaCl 2 form of stishovite distortion at 54 ± 1 gigapascals but confirmed no further phase transformation up to 120 gigapascals. The deviatoric stress that is usually encountered at such pressures was relaxed after yttrium-aluminum-garnet–laser heating. A single Birch-Murnaghan equation of state fits volumes of stishovite and a CaCl 2 form, showing that the tetragonal distortion occurs without a substantial change in volume. At the 54-gigapascal transition, the pressure-induced lattice modifications were similar to those found in a Landau-type temperature-induced transition. It is proposed that, above the transition pressure, the critical temperature increases above 300 kelvin, so that the lower entropy form becomes stable.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 27, 2002, 5:50 a.m.) |
Deposited | 1 year, 7 months ago (Jan. 13, 2024, 12:12 a.m.) |
Indexed | 1 week, 1 day ago (Aug. 19, 2025, 6:20 a.m.) |
Issued | 26 years, 10 months ago (Oct. 23, 1998) |
Published | 26 years, 10 months ago (Oct. 23, 1998) |
Published Print | 26 years, 10 months ago (Oct. 23, 1998) |
@article{Andrault_1998, title={Pressure-Induced Landau-Type Transition in Stishovite}, volume={282}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.282.5389.720}, DOI={10.1126/science.282.5389.720}, number={5389}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Andrault, Denis and Fiquet, Guillaume and Guyot, François and Hanfland, Michael}, year={1998}, month=oct, pages={720–724} }