【摘要】 为研究CuO掺杂对ZnO基压敏陶瓷中的电子密度和电性能的影响,以固相反应法制备了CuO掺杂的ZnO-Bi2O3-Sb2O3-Co2O3-MnO2-Cr2O3基压敏陶瓷,测量了其正电子湮没寿命谱及电性能,结果表明,随着CuO含量的增加,ZnO基压敏陶瓷基体(晶粒内部)和晶界缺陷态的自由电子密度降低,导致其压敏电压V1mA和漏电流IL升高,非线性系数)减小。CuO含量为1.0%的ZnO基压敏电阻可用于220 V交流电路的过压保护。更多还原

【Abstract】 In order to study the effects of CuO dopant on electron density and electrical properties of ZnO-based varistor ceramics,the CuO doped ZnO-Bi2O3-Sb2O3-Co2O3-MnO2-Cr2O3varistor ceramics were prepared by means of the solid state reaction method,and the positron lifetime spectra and electrical properties of the varistor ceramics were measured. The experimental results show that the electron densities in the bulk and on the grain boundaries decrease with the CuO content in the ZnObased varistor increasing,resulting in the increase of threshold voltage( V1mA) and leakage current( IL),and the decrease of nonlinear coefficient()) of the ZnO-based ceramics. The ZnO-based varistor ceramic with 1. 0% CuO can be used to the overvoltage protection in a 220 V AC source circuit.更多还原