变阻器
材料科学
晶界
兴奋剂
介电常数
扫描电子显微镜
分析化学(期刊)
粒度
电阻率和电导率
相对介电常数
复合材料
电介质
微观结构
光电子学
化学
电气工程
电压
工程类
色谱法
作者
Wenxin Wang,Jinfeng Wang,Hong‐Cun Chen,Weizhou Su,Guo‐Zhong Zang
标识
DOI:10.1016/s0921-5107(02)00477-4
摘要
The effects of Cr2O3 on the properties of (Co, Nb)-doped SnO2 varistors were investigated. The samples with different Cr2O3 concentrations were sintered at 1350 °C for an hour. The properties of (Cr, Co, Nb)-doped SnO2 varistors were evaluated by determining their I–V and ε–f relations, measuring their resistivities, scanning electron microscopy. It was found that the breakdown electrical field increases from 400 to 1000 V mm−1 and relative electrical permittivity decreases from 2022 to 147 with increasing Cr2O3 from 0.00 to 0.07 mol%. Nonlinear coefficient presents a peak of α=52 and grain boundary barrier becomes highest when 0.06 mol% Cr2O3 was added. Electrical permittivity and grain size decreases with increasing the content of Cr2O3. In order to illustrate the grain boundary barrier formation in this varistor system, an interface defect model was introduced.
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