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

Authors
Dubrovinskaia, NA Dubrovinsky, LS Saxena, SK Tutti, F Rekhi, S Le Bihan, T
Citation
Na. Dubrovinskaia et al., Direct transition from cristobalite to post-stishovite alpha-PbO2-like silica phase, EUR J MINER, 13(3), 2001, pp. 479-483
Citations number
19
Categorie Soggetti
Earth Sciences
Journal title
EUROPEAN JOURNAL OF MINERALOGY
ISSN journal
09351221 → ACNP
Volume
13
Issue
3
Year of publication
2001
Pages
479 - 483
Database
ISI
SICI code
0935-1221(200105/06)13:3<479:DTFCTP>2.0.ZU;2-1
Abstract
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 demonstra te that so far unidentified phases obtained on compression of alpha -cristo balite and a new dense silica polymorph discovered in the Martian meteorite Shergotty is the alpha -PbO2-type silica.