Anharmonic lattice mode of Ca2SiO4: Ultraviolet laser Raman spectroscopy at high temperatures

Hirotaka Fujimori, Hiroshi Komatsu, Koji Ioku, Seishi Goto, Masahiro Yoshimura

研究成果: Article査読

23 被引用数 (Scopus)

抄録

Raman spectra of Ca2SiO4 have been obtained at temperatures up to 1723 K by using a continuous-wave ultraviolet Raman spectroscopic system. At room temperature, the typical Raman spectrum of γ-Ca2SiO4 was recorded. In the region of 1073-1123 K, two strong bands of the γ phase around 800 and 900 cm-1 disappeared, which indicates the γ→α′L transformation. Raman frequencies decreased in the α′L and α′H phases with increasing temperature. The measured shifts are used in conjunction with available high-pressure Raman data to calculate the Gruneisen parameter related to pressure variation at constant temperature, the corresponding parameter related to temperature variation at constant pressure, and the anharmonic parameter. Although the anharmonicity is weaker for the bands related to the internal vibrations of Si-O bonds (more than around 400 cm-1), the band related to the lattice vibration mode (around 250 cm-1) shows stronger anharmonic behavior.

本文言語English
論文番号064306
ページ(範囲)643061-643065
ページ数5
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
66
6
DOI
出版ステータスPublished - 2002 8月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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