Abstract
Raman spectra of (formula presented) 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 (formula presented) was recorded. In the region of 1073-1123 K, two strong bands of the γ phase around 800 and 900 (formula presented) disappeared, which indicates the (formula presented) transformation. Raman frequencies decreased in the (formula presented) and (formula presented) 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 (formula presented)), the band related to the lattice vibration mode (around 250 (formula presented)) shows stronger anharmonic behavior.
| Original language | English |
|---|---|
| Pages (from-to) | 1-5 |
| Number of pages | 5 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 66 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2002 Jan 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Anharmonic lattice mode of (formula presented) : Ultraviolet laser Raman spectroscopy at high temperatures. / Fujimori, Hirotaka; Komatsu, Hiroshi; Ioku, Koji; Goto, Seishi; Yoshimura, Masahiro.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 6, 01.01.2002, p. 1-5.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Anharmonic lattice mode of (formula presented)
T2 - Ultraviolet laser Raman spectroscopy at high temperatures
AU - Fujimori, Hirotaka
AU - Komatsu, Hiroshi
AU - Ioku, Koji
AU - Goto, Seishi
AU - Yoshimura, Masahiro
PY - 2002/1/1
Y1 - 2002/1/1
N2 - Raman spectra of (formula presented) 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 (formula presented) was recorded. In the region of 1073-1123 K, two strong bands of the γ phase around 800 and 900 (formula presented) disappeared, which indicates the (formula presented) transformation. Raman frequencies decreased in the (formula presented) and (formula presented) 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 (formula presented)), the band related to the lattice vibration mode (around 250 (formula presented)) shows stronger anharmonic behavior.
AB - Raman spectra of (formula presented) 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 (formula presented) was recorded. In the region of 1073-1123 K, two strong bands of the γ phase around 800 and 900 (formula presented) disappeared, which indicates the (formula presented) transformation. Raman frequencies decreased in the (formula presented) and (formula presented) 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 (formula presented)), the band related to the lattice vibration mode (around 250 (formula presented)) shows stronger anharmonic behavior.
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U2 - 10.1103/PhysRevB.66.064306
DO - 10.1103/PhysRevB.66.064306
M3 - Article
AN - SCOPUS:85038928860
VL - 66
SP - 1
EP - 5
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 6
ER -