Journal
CHEMICAL PHYSICS LETTERS
Volume 333, Issue 3-4, Pages 264-270Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(00)01147-7
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X-ray in situ studies in electrically and laser-heated diamond anvil cells (DACs) at pressures over 80 cpa and temperatures above 2500 K were used to determine stable silica phase at extreme conditions. We demonstrate that so far unidentified phases obtained on the compression of cc-cristobalite, new dense silica polymorph in the Martian Shergotty meteorite, and controversial post-stishovite phase is alpha -PbO2-like silica. (C) 2001 Elsevier Science B.V. All rights reserved.
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