Kato Kihiro, Tsukada Shinya, Kano Jun, Yamamoto Takashi, Kojima Seiji
Graduate School of Pure and Applied Sciences, University of Tsukuba,Tsukuba, Ibaraki, 305-8573, Japan.
IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Dec;54(12):2599-602. doi: 10.1109/TUFFC.2007.585.
The paraelectric to ferroelectric phase transitions were studied by Raman scattering in Ca-doped lead titanate ceramics. The soft optic modes responsible for the ferroelectric phase transitions were clearly observed. The A(1)(1TO) mode, which softens toward T(c), contains four subpeaks. The frequencies of these subpeaks depend to a great extent on the Ca content and the temperature. These behaviors are discussed on the basis of the anharmonicity of lattice vibrations.
通过拉曼散射研究了钙掺杂钛酸铅陶瓷中顺电到铁电的相变。清晰地观察到了导致铁电相变的软光学模。向居里温度（(T_c)）软化的(A_1(1TO))模包含四个子峰。这些子峰的频率在很大程度上取决于钙含量和温度。基于晶格振动的非简谐性对这些行为进行了讨论。
