Vibrational properties of Ba8Ga16Sn30 under high pressure

18th APS-SCCM; 24th AIRAPT

Sukemura, T.^1 ; Kume, T.^1 ; Matsuoka, T.^1 ; Sasaki, S.^1 ; Onimaru, T.^2 ; Takabatake, T.^2

Department of Materials Science and Technology, Gifu University, 1-1 Yanagido, Gifu

501-1193, Japan^1

Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima

739-8530, Japan^2

关键词: Cage sizes;    Clathrates;    High pressure;    High pressure Raman;    Rattling vibration;    Spectral shapes;    Vibrational properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182022/pdf
DOI  :  10.1088/1742-6596/500/18/182022

来源: IOP

【 摘 要 】

High-pressure Raman scattering experiments were performed for type-I Sn based clathrates, Ba8Ga16Sn30, at room temperature up to 6.9 GPa. We observed irreversible amorphization at 6 GPa. The rattling vibrations of the guest atoms in the cages were investigated up to 5.8 GPa. Pressure induced evolution of spectral shape of the rattling suggested that the reduction in the cage size causes the displacement of the guest atoms from the off center to the center in the cage.