R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2-02] Raman spectroscopic study of tridymite modifications

*Masami Kanzaki¹ (1. IPM, Okayama U.)

Keywords:tridymite, Raman spectroscopy, polytype, phase transition

Tridymite modifications (PO-10, MC, MX-1) were studied by Raman spectroscopy. The compiled spectra allow us to identify those modifications in natural and synthetic samples. Temperature-induced transitions were also studied. Our result was consistent with previous study, but it revealed significant changes at the low-frequency region. The anticipated soft mode for OC was not observed, but a low-frequency peak of OC disappeared at around 470 ºC.