中文摘要：

研究了银/氧化锌复合材料的介电特性,发现其在低频下的频率特性表现出很强的弥散现象,直流电导相对真交流电导也不可忽略.利用普适介电理论,对于频率范围为10-1—107Hz,温度范围为173—473K的实验结果进行了分析.通过对电导率的标准化处理发现,不同银含量的样品其介电损耗机理相同,均属深能级的电子跳跃.试样的电位梯度E1mA随银含量的变化可以通过αlf随银含量的变化关系来反映.实验结果可用普适介电理论得到较好解释.

英文摘要：

The dielectric properties of Ag/ZnO composite material are investigated and a strong low-frequency dispersion phenomenon is found. The experimental results are systematically studied in the frequency range of 0.1--10^7 Hz and in the temperature range of 173--473 K. By means of normalization of conductivity, it is found that samples with different Ag contents show similar mechanism of dielectric loss, which is suggested as electron jumping between deep levels. In addition, it is also found that the dependence of E1mA on Ag content is similar to that of all on Ag content, which is a novel result in the research of varistor materials. The results can be fully understood by means of universal power law.