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Science 23 October 1998:
Vol. 282. no. 5389, pp. 720 - 724
DOI: 10.1126/science.282.5389.720
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Reports

Pressure-Induced Landau-Type Transition in Stishovite

Denis Andrault, * Guillaume Fiquet, François Guyot, Michael Hanfland

A Rietveld structural analysis of stishovite, with angle-dispersive x-ray diffraction synchrotron source at the European Synchrotron Radiation Facility, confirmed a CaCl2 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 CaCl2 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.

D. Andrault, Laboratoire des Géomatériaux, Institut de Physique du Globe, Paris 75252, France. G. Fiquet, Laboratoire de Géologie, Ecole Nationale Supérieure de Lyon, Lyon 69364, France. F. Guyot, Laboratoire de Minéralogie-Cristallographie, Université Paris VII, Paris 75252, France, and Institut de Physique du Globe, Paris 75252, France. M. Hanfland, European Synchrotron Radiation Facility, Grenoble 38043, France.
*   To whom correspondence should be addressed.

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