摘要
讨论了慢度曲面与声学模软化之间的关系.立方晶系晶体声学模的软化即对应其在某一方向上的最大慢度,软模的本征矢的方向即为与最大慢度相对应的声学模的偏振化方向.通过求解Christoffel方程可找到某些方向上的最大慢度和与它们对应的声学模的偏振化方向.从而晶体在本征铁弹相变前后结构对称性的变化可以通过分析Christoffel方程的解及利用居里原理来确定.
The relationship between the slowness-curved-surface and the softening of the acoustic mode is discussed.The acoustic mode softening of cubic systems corresponds to the maximum slowness.The eigenvector in the soft mode corresponds to the polarization of acoustic mode.By solving the Christoffel equation,the maximum slowness and the polarization of the acoustic mode are obtained.The symmetry change of proper ferroelastic phase transition of cubic systems is determined by the solution of the Christoffel equation and the Curie principle.
出处
《计算物理》
CSCD
北大核心
2005年第3期217-220,共4页
Chinese Journal of Computational Physics
基金
SupportedbytheHebeiProvinceCollegesandUniversitiesKeySubjectConstructingItemandthePh .D .Foundation
