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

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

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number064306
Pages (from-to)643061-643065
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number6
DOIs
Publication statusPublished - 2002 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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