建立了一个考虑中间相的“复合介电模型”，利用平均极化理论和Maxwell-Garnett理论导出了考虑中间相的二元无规复合材料的有效介电常数的普适计算公式。用该公式分析了聚苯乙烯-钛酸钡复合材料的有效介电常数。当钛酸钡体积含量小于20%时，理论值与实验结果符合较好。
In the course of making polystyrene-barium titanate composites, due to diffusion, etc, there exist interfaces between the scattered grains and the host medium. The dielectric properties of the interfaces are different from the dielectric properties of polystyrene and barium titanate. Considering the interfaces between polystyrene and barium titanate, a new “complex model” of dielectric constant of two-phase composites is built up. Starting from the average polarization theory and Maxwell-Garnett theory, the effective dielectric constant of two-phase random composites with an interface is presented. When the volume fraction of the scatter grain is smaller than 20%, the theoretical results on dielectric properties of polystyrene-barium titanate composites with interface are in good agreement with experimental data.
参考文献
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