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

[R2P-02] Dynamics of Guest Molecules of Melanophlogite and Chibaite

*Kouta Hiranuma¹, Koichi Momma³, Maho Kageyama², Yui Shiraishi², Hidekazu Okamura¹, Naoki Noguchi¹ (1. Tokushima Univ. Tech., 2. Tokushima Univ. Sci And Tech., 3. Nat’l. Mus. Nat. Sci.)

Keywords:Melanophlogite, Chibaite, Raman spectroscopy, Infrared spectroscopy

Melanophlogite and Chibaite are clathrate compounds in which guest molecules are enclosed in cages consisting of SiO₂.In this study, Raman and infrared spectra of Melanophlogite and Chibaite were measured at low temperatures to investigate the temperature dependences in the thermal vibrations of the guest molecules of these minerals. The temperatureshift rates of the Raman bands of the guest molecules in the large cages are larger than those of the small cages.