Soft Modes and Superlattice Structures in NaNbO_3
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概要
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From the study of superlattice reflections in X-ray diffraction, phase transitions at 365℃, 480℃, 520℃, 572℃ and 643℃ in NaNbO_3 are definitely identified by some distinct changes of the positions and intensities. The anisotropic diffuse X-ray scatterings have been studied with a special respect to the phase transitions. The modes of vibration which are responsible for the diffuse scatterings are found to be Γ_<25> and M_3 modes at R and M points, respectively. It is found from anomalous increases of the diffuse intensities that the M_3 mode condenses at 643℃ and E_g mode, into which two of the Γ_<25> mode transform, condenses at 572℃. The behaviors of the zone boundary phonons in NaNbO_3 are compared with those in KMnF_3. The correlation of superlattice structures with the instability of the zone boundary phonons is discussed.
- 社団法人日本物理学会の論文
- 1973-05-05
著者
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Honjo Goro
Department Of Physics Tokyo Institute Of Technology
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Ishida Koichi
Department Of Physics Tokyo Institute Of Technology:(present Address) Central Research Laboratories
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Ishida Koichi
Department Of Physics Tokyo Institute Of Technology
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Ishida Koichi
Department of Media Science, Faculty of Science and Technology, Teikyo University of Science and Technology, 2525 Yatsusawa, Uenohara-machi, Kitatsuru-gun, Yamanashi 409-0193, Japan
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ISHIDA Koichi
Department of Food Science and Technology, Faculty of Agriculture, Nagoya University
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