Pressure-induced transformations of cristobalite

  title={Pressure-induced transformations of cristobalite},
  author={Leonid Dubrovinsky and Natalia Dubrovinskaia and Surendra K. Saxena and F. Tutti and Sandeep Rekhi and Thierry Le Bihan and Guoyin Shen and Jie Hu},
X-ray in situ studies in electrically and laser-heated diamond anvil cells (DACs) at pressures over 80 GPa and temperatures above 2500 K were used to determine stable silica phase at extreme conditions. We demonstrate that so far unidenti®ed phases obtained on the compression of a-cristobalite, new dense silica polymorph in the Martian Shergotty meteorite, and controversial post-stishovite phase is a-PbO2-like silica. Ó 2001 Elsevier Science B.V. All rights reserved. 
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