Author/Authors :
Dubrovinsky، نويسنده , , L.S and Dubrovinskaia، نويسنده , , N.A and Saxena، نويسنده , , S.K and Tutti، نويسنده , , F and Rekhi، نويسنده , , S and Le Bihan، نويسنده , , T and Shen، نويسنده , , Guoyin and Hu، نويسنده , , J، نويسنده ,
Abstract :
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 unidentified phases obtained on the compression of α-cristobalite, new dense silica polymorph in the Martian Shergotty meteorite, and controversial post-stishovite phase is α-PbO2-like silica.
