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

¹ Department of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden
² European Synchrotron Radiation Facility, Grenoble 38043, France

View larger version (15K): [in this window] [in a new window]   Fig. 1. Examples of diffraction patterns collected on compression of -cristobalite at room temperature. The initial material (bottom line) is -cristobalite (a = 4.9733(3) Å, c = 6.9234(4) Å). At pressures above 10 GPa -cristobalite transforms to cristobalite-XI (Tsuchida & Yagi, 1990), "CrXI", second line from bottom. At pressures above 37 GPa new reflections start growing and the phase transition to -PbO2-type structure ("S") is completed by 45 GPa. On further compression to 89 GPa at room temperature we did not observe any other phase transitions. Platinum reflections are marked as "Pt".