机构地区: 江西理工大学理学院
出 处: 《量子电子学报》 2010年第5期620-625,共6页
摘 要: 在随机元素等位移(MREI)模型的基础上,进一步改进了模型。在计算多元混晶声子频率时,对不同模式采用了不同的次近邻常数,并且推算了近邻常数与组分x呈负幂指数变化的规律,从而不使用任何调节参数计算了几种AB_(1-x)C_x混晶的声子频率对组分x的依赖关系。理论结果和实验数据两者符合较好,对今后的实验给出了一定程度的指导。 The modified random-element isodisplacement (MREI) model is improved. The different second neighbor force constants are used to calculate the frequencies of optical phonons of the mixed crystals, and the first neighbor force constants can be evaluated to be a negative exponent variation with the composition x, thus the relationship between optical phonons frequencies and composition x of several AB1-xCx style mixed crystals was calculated without any modulatory parameters. The theoretical results and experimental data meet well with each other, which gives certain guidance to future experiments.