物理学报Issue(22)：226103-1-226103-7,7.DOI:10.7498/aps.62.226103
沉淀剂对ZnO压敏陶瓷缺陷结构和电气性能的影响
The effects of precipitant on the defect structures and properties of ZnO varistor ceramics
摘要
Abstract
The effects of different precipitants (NH4HCO3 and NaOH) on the performances of ZnO varistor ceramics which were prepared by coprecipitation method were analyzed. There are noticeable influences for different precipitants to the microstructure and electrical performances of ZnO varistor ceramics. The change of microstructure is caused by the properties of precipitants themselves while the change of electrical performance is caused by the influence of precipitants to the grain boundary potential barrier properties. Besides, the donor impurity ion Na+introduced by NaOH in the ZnO varistor ceramic will increase the free electron concentration in the grain. So the densities of intrinsic defects (zinc interstitial and oxygen vacancy) are restrained. The density of zinc interstitial is more sensitive to donor impurity ions compared with oxygen vacancy. Therefore the choice of precipitant is important when using coprecipitation method to prepare the powder of ZnO varistor ceramics. Even little impurity ions will result in the obvious change of the performance of varistor ceramics. The impurity ions should be avoided in the powder of ZnO varistor ceramics.关键词
ZnO压敏陶瓷/缺陷结构/沉淀剂/介电性能Key words
ZnO varistor ceramics/defect structure/precipitant/dielectric properties引用本文复制引用
王辉,蔺家骏,何锦强,廖永力,李盛涛..沉淀剂对ZnO压敏陶瓷缺陷结构和电气性能的影响[J].物理学报,2013,(22):226103-1-226103-7,7.基金项目
国家自然科学基金(批准号:50972118)和中国南方电网公司科技项目(批准号:K-KY2012-002)资助的课题.*Project supported by the National Natural Science Foundation of China (Grant No.50972118) and China Southern Power Grid Project of Science and Technology (Grant No. K-KY2012-002) （批准号:50972118）
