Vibrational Spectra of Ca3SiO5: Ultraviolet Laser Raman Spectroscopy at High Temperatures |
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| Authors: | Hirotaka Fujimori Hiroshi Komatsu Koji Ioku Seishi Goto Tomoaki Watanabe |
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| Affiliation: | Division of Applied Medical Engineering Science, Graduate School of Medicine and Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Yamaguchi 755-8611, Japan; Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan |
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| Abstract: | The Raman spectra of Ca3SiO5 have been successfully obtained at temperatures up to 1353 K by a continuous-wave ultraviolet Raman spectroscopic system. The Raman spectra do not change significantly with an increase in temperature, despite triclinic ( T )→monoclinic ( M )→rhombohedral ( R ) transitions. The present result is described in terms of the parameter related to temperature variation at constant pressure, defined in a manner similar to the Gruneisen parameter. Raman bands located above 350 cm−1 show smaller values of the parameter than lower frequency modes, suggesting that these higher frequency modes are assigned to SiO4 internal modes. |
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