摘要
测量了不同CaCO3含量的ZnO-Bi2O3-Sb2O3-Co2O3-MnO2-Cr2O3-CaCO3压敏陶瓷的正电子寿命谱及其I-V特性,研究了CaCO3对ZnO基压敏陶瓷的微观缺陷和电性能的影响。实验发现,含0.25%(摩尔分数)的CaCO3的ZnO基压敏陶瓷的缺陷浓度、基体和晶界缺陷的电子密度以及压敏电压比不含CaCO3的ZnO基压敏陶瓷的低。当CaCO3含量高于摩尔分数0.25%时,随着CaCO3含量的增加,ZnO基压敏陶瓷缺陷浓度、基体和晶界缺陷态的电子密度升高,从而导致其压敏电压和非线性系数增加,漏电流减小。
The effects of CaCO3 additive on microdefects and electrical properties of ZnO-based varistor ceramics were investigated by measuring the I-V characteristic and the positron lifetime spectra of ZnO-Bi2O3-Sb2O3-Co2O3-MnO2-Cr2O3-CaCO3 ceramics with different contents of CaCO3. The results show that the concentration of defects, the electron densities of bulk and defects on grain boundaries, the breakdown electrical field of the ZnO-based ceramic with CaCO3 of 0.25% （mole fraction） are lower than that of the ZnO-based ceramic without CaCO3. For the ZnO-based varistor ceramics whose CaCO3 content is higher than 0.25% （mole fraction）, with the increase of the CaCO3 content, the concentration of defects, the electron densities of bulk and defects on grain boundaries increase, giving rise to the increases of the breakdown electrical field and the nonlinear coefficient, and the decrease of the leakage current.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2013年第11期11-14,共4页
Electronic Components And Materials
基金
国家自然科学基金资助项目(No.11265002)
广西自然科学重点基金资助项目(No.2010GXNSFD013036)
