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本文利用慢度曲面法研究LRSHS晶体的铁弹相变。画出了LRSHS晶体在发生铁弹相变过程中一些温度下的慢度曲面图,得到了最大慢度。研究结果表明:晶体在三维空间的慢度最大值方向就是发生本征铁弹相变的方向,即声学软模软化的方向。确定出声学模的软化方向,即可确定出发生本征铁弹相变时软化显著的弹性劲度系数,再利用居里原理即可得到晶体铁弹相的对称性。
In this paper, we use the slowness surface method to study the iron-bomb phase transformation of LRSHS crystals. The slowness of the LRSHS crystal is plotted at some temperatures during the transformation of the iron shells, resulting in the maximum slowness. The results show that the direction of the slow phase of the crystal in the three-dimensional space is the direction of the intrinsic transformation of iron-core, that is, the direction of acoustic soft-mode softening. Determine the softening direction of the acoustic mode, you can determine the occurrence of intrinsic iron-elastic phase change softening significant elastic stiffness coefficient, and then use the Curie principle to get the symmetry of crystal iron elastic phase.