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
European Journal of Mineralogy Volume 13 Number 3 (2001), p. 479 - 483
published: May 29, 2001
ArtNo. ESP147051303005, Price: 29.00 €
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.