四方晶系
各向异性
极化(电化学)
正交晶系
横波
横截面
凝聚态物理
特征向量
纵波
物理
六方晶系
材料科学
光学
波传播
晶体结构
衍射
结晶学
化学
量子力学
结构工程
物理化学
工程类
摘要
In an anisotropic medium there are only certain directions along which elastic waves can propagate in pure longitudinal and transverse modes. For the determination of third-order elastic coefficients from sound speed measurements in stressed crystals it is desirable to know these modes. Using a method due to Borgnis the pure mode directions are determined for all crystal point groups belonging to the orthorhombic, tetragonal, cubic, rhombohedral, and hexagonal systems. The eigenvalue problem is solved for each of these directions, and the polarization vectors and the wave speeds are tabulated.
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