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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 surface and the acoustic mode softening is discussed.The softening of the cubic crystal acoustic mode corresponds to its maximum slowness in a certain direction and the direction of the eigenvector of the soft mode corresponds to the maximum slowness The polarization direction of the acoustic mode.The maximum slowness in some directions and the polarization direction of the acoustic modes corresponding to them can be found by solving the Christoffel equation so that the structural symmetry of the crystal before and after the transformation of the intrinsic iron- Analyze the solution of Christoffel equation and use the principle of Curie to determine.