Crossref journal-article
American Association for the Advancement of Science (AAAS)
Science (221)
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.

Bibliography

Andrault, D., Fiquet, G., Guyot, F., & Hanfland, M. (1998). Pressure-Induced Landau-Type Transition in Stishovite. Science, 282(5389), 720–724.

Authors 4
  1. Denis Andrault (first)
  2. Guillaume Fiquet (additional)
  3. François Guyot (additional)
  4. Michael Hanfland (additional)
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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)
Funders 0

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@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} }