Original paper

Direct transition from cristobalite to post-stishovite alpha-PbO2-like silica phase

Dubrovinskaia, Natalia A.; Dubrovinsky, Leonid S.; Saxena, Surendra K.; Tutti, Faramaz; Rekhi, Sandeep; Le Bihan, Tristan


In situ X-ray studies in diamond anvil cells at pressures over 80 GPa were used to determine a stable silica phase at extreme conditions. We demonstrate that so far unidentified phases obtained on compression of α-cristobalite and a new dense silica polymorph discovered in the Martian meteorite Shergotty is the α-PbO2-type silica.


silicaalpha-cristobalitephase transitiondiamond anvil cellhigh-pressure phase