We study the coupled macroscopic and lattice wave propagation in anisotropic crystals seen as continua with affine microstructure (or micromorphic). In the general case we obtain qualitative informations on the frequencies and the dispersion realtions. These results are then specialized to crystals of the tetragonal point group for various propagation directions: exact representation for the acoustic and optic frequencies and for the coupled vibrations modes are obtained for propagation directions along the tetragonal c-axis.

中文翻译：

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波在微晶各向异性连续体中的传播并应用于四方晶体

我们研究了被视为具有仿射微结构（或微晶）的连续体的各向异性晶体中的耦合宏观和晶格波传播。在一般情况下，我们获得关于频率和色散关系的定性信息。然后将这些结果专门用于各种传播方向的四方点群晶体：声频和光频以及耦合振动模式的精确表示可用于沿四方 c 轴的传播方向。