Abstract Effective electrical resistivities and static relative permittivities of binary powder mixtures were measured and compared to theoretical equations given by Generalized Mixture Rule (GMR). The measured values for mixtures were influenced by the resistivity and permittivity of the pure component materials, the particle sizes and by the sticking between the different particles. According to the Random Model (RM), the effective resistivity and relative permittivity of any randomly packed mixture material can be calculated from the component resistivities and relative permittivities, respectively, and their concentrations. It was shown that RM gave good predictions for both quantities for powders if the particle sizes of the component materials were almost the same. However, this was not the case when large NaCl particles were mixed with fine sugar particles. When these mixtures were prepared, finer, more numerous sugar particles coated the larger NaCl particles, and the mixtures were not random but closer to the series configuration. Effect of particle size was studied briefly by mixing very fine NaCl particles with sugar of similar size. With these mixtures, results predicted by RM were obtained.

中文翻译：

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二元粉末混合物的电阻率和相对介电常数

摘要 测量了二元粉末混合物的有效电阻率和静态相对介电常数，并与广义混合规则 (GMR) 给出的理论方程进行了比较。混合物的测量值受纯组分材料的电阻率和介电常数、颗粒尺寸以及不同颗粒之间的粘附影响。根据随机模型 (RM)，任何随机填充的混合物材料的有效电阻率和相对介电常数都可以分别从组分电阻率和相对介电常数及其浓度计算出来。结果表明，如果组分材料的粒径几乎相同，则 RM 对粉末的两种数量都给出了很好的预测。然而，当大 NaCl 颗粒与细糖颗粒混合时，情况并非如此。制备这些混合物时，更细、数量更多的糖颗粒覆盖在较大的 NaCl 颗粒上，并且混合物不是随机的，而是更接近于串联配置。通过将非常细的 NaCl 颗粒与相似尺寸的糖混合，简要研究了颗粒尺寸的影响。使用这些混合物，获得了 RM 预测的结果。