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运用改进的无规元素孤立位移模型，研究了三元混晶构成的三层极性半导体之界面光学（ＩＯ）声子模．发现在典型的三元混晶三层系中，除局域在三个单层内的６支类体模外，存在１２支ＩＯ声子模．将有效声子模近似用于简化三元混晶异质结构的电子－声子相互作用问题．数值计算并讨论了几种实际体系的ＩＯ声子模频率．
By using the improved random element displacement model, the interface optical (10) phonon modes of three-layer polar semiconductor consisting of ternary mixed crystals were studied. It is found that in the typical ternary mixed-crystal three-layer system, there are 12 tenophone modes except for the six-branch phantom localized in three monolayers. An effective phonon mode approximation is used to simplify the electron-phonon interaction problem of ternary mixed-crystal heterostructures. Numerical calculation and discussion of several practical systems of the IO phonon frequency.