异质材料电磁特性及局域场增强效应研究  

Electromagnetic Properties of Heterogeneous Materials and the Local Electric Field Enhancement Effects

作　　者：杨晶晶[1,2] 黄铭[1] 杨成福[1] 彭金辉[2] 施继红[1] 

机构地区：[1]云南大学信息学院,昆明650091 [2]昆明理工大学材料与冶金工程学院,昆明650093

出　　处：《材料导报》2009年第24期1-4,16,共5页Materials Reports

基　　金：云南省教育厅重点项目(07Z10875);云南省自然科学基金(2007F005M);教育部重点项目(208133);国家自然科学基金(60861002);国家重点基础研究发展计划(973)项目(2007CB613606)

摘　　要：采用准静电模型仿真了两相异质材料的等效介电常数和局域场分布,结果表明,对于介质-介质型异质材料,三维模型等效介电常数仿真值与Bruggeman公式相符,并位于Hashin-Shtrikman上下界之间;异质材料内两相介电常数差异越大,其内局域场越强。对于由导电相和介质相构成的异质材料,仿真结果表明,异质材料内的电场分布受导电相填充比、形状和电导率等因素的影响;导电相导电性越好,其局域场增强现象越明显。Effective permittivity and inner electric field distribution of the two-phase heterogeneous medium are simulated based on quasi-static models. It shows that for the dielectric-dielectric mixture, the simulation results of the three-dimensional model are in good agreement with the Bruggeman formula and fall always between Hashin-Shtrikman limits. The larger the permittivity contrasts between the two dielectric phases, the greater the local electric field intensity. For the conductor-dielectric mixture, simulation results show that local electric field enhancement phenomenon is governed by a combination of factors such as volume ratio, shape and electric conductivity of the inclusion, and the larger the electrical conductivity, the stronger the local electric filed intensity.

关 键 词：异质材料 等效介电常数 局域场增 强数值模拟 

分 类 号：O441.6[理学—电磁学] TB33[理学—物理]