Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Vibrational Properties and Phase Transitions of Silicon Clathrates Studied by High-Pressure Raman Scattering(Current Topics)
Hiroyasu ShimizuTetsuji Kume
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2005 Volume 60 Issue 7 Pages 543-546

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Abstract

Silicon clathrates are covalent bonded cage-like crystals composed of face-sharing Si20, Si24, and Si28 polyhedra in which guest atoms are occupied. These compounds continue to attract much attention as new superconductors, unusual wide-bandgap semiconductor, and a new class of thermo-electric materials. Vibrational properties of guests and host lattice, and the guest-host interactions are studied by high-pressure Raman spectroscopy. By considering these results and high-pressure phase transitions of Si clathrates, we investigate their characteristics depending on guests and cage-structures.

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