Elsevier, Chemical Physics Letters, 3-4(333), p. 264-270
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 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-PbO 2 -like silica. Ó 2001 Elsevier Science B.V. All rights reserved.