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Since there is no software for dielectric properties calculation of the infrared band. Some of the existing commercial software about quantum mechanical calculations£¨such as CASTEP£©, only can calculate dielectric properties of UV to visible spectrum. For the three-dimensional crystal, the dielectric parameters , crystal structure and the frequency of the external electric field are closely related to tensor. Thus, considering the contribution of ionic displacement polarization and electron cloud polarization comprehensively, the parameters of calculation method in the model must begin from dielectric parameters of computing model. Meanwile, the corresponding relationship of the crystal structure and model parameters is solved. Finally, the dielectric parameters with frequency are obtained. [ Last edited by jw227 on 2009-9-6 at 21:02 ] |

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