R3: High-pressure science and deep Earth’s material

[R3P-03] Pressure-induced phase transitions of tridymite by Raman spectroscopy

*Masami Kanzaki¹ (1. Okayama U. IPM)

Keywords:tridymite, pressure-induced phase transition, Raman spectroscopy

The pressure-induced phase transitions of tridymite (MC, MX-1, PO-10) were investigated by in-situ Raman spectroscopy. Starting from MC, the phase transition to PO-10 was observed at about 0.3 GPa, and new Raman peaks appeared at 1.5 GPa. The similar transitions were observed for MX-1 and PO-10, and PO-10 was always recovered. This observation suggests that the rare PO-10 in the meteorite may have been altered by shock events from the more common MC.