Pressure induced phase transformation of Ba8Ga 16Ge30 clathrate studied by x-ray diffraction and Raman spectroscopy

Tetsuji Kume, Satoshi Ohno, Shigeo Sasaki, Hiroyasu Shimizu, Yasuo Ohishi, Norihiko L. Okamoto, Kyosuke Kishida, Katsushi Tanaka, Haruyuki Inui

研究成果: Article査読

13 被引用数 (Scopus)


The phase transition and the vibrational properties of Ba 8Ga16Ge30 have been investigated at high pressures up to 40 GPa at room temperature. The combined study of the high-pressure Raman and synchrotron powder x-ray diffraction (XRD) experiments revealed the occurrence of a first-order phase transition at 33 GPa, on which a volume decrease of about 3% was found. Rietveld refinements of the XRD data demonstrated the atomic displacements precursory to the phase transition, allowing us to discuss the mechanism of the phase transition. In the Raman experimental data, anomalies were observed in the spectral feature and the guest vibration around 17 GPa. By combining the Raman results with the XRD ones, the vibrational frequency of the guest Ba was investigated as a function of the host cage size. As a result, a linear relation between guest vibrational frequency and the guest-host distance was identified.

ジャーナルJournal of Applied Physics
出版ステータスPublished - 2010 2 5

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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