添加剂离子半径对ZnO压敏电阻非线性系数的影响  

Effect of Additive Ionic Radius on Maximum Nonlinear Coefficient of ZnO Varistors

作　　者：刘建科[1] 陈永佳[2] 崔永宏[1] 韩晨[2] 张诚[1] 范亚红[1] 梁楚轩 

机构地区：[1]陕西科技大学文理学院,西安710021 [2]陕西科技大学电气与信息工程学院,西安710021

出　　处：《硅酸盐学报》2016年第12期1736-1739,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51272145);陕西省自然科学基金(2011JM1014)

摘　　要：分析了添加剂离子半径(R_i)对氧化锌(ZnO)压敏电阻最大非线性系数(α_(max))的影响。通过数据分析和曲线拟合得到α_(max)与R_i之间的函数关系,同时发现了Ri和锌离子(Zn^(2+))半径之间的相对偏差(△R_(rel))对α_(max)值的影响规律。结果表明:α_(max)与R_i之间满足特定的函数关系,通过该函数关系计算得到的α_(max)值能够和相关文献中报道的实际非线性系数(α_(rea))吻合;压敏电阻的α_(max)值随着△R_(rel)的增大而增大,当△R_(rel)大于30%时,其增大程度开始变缓,此时ZnO压敏电阻的α_(max)值大于64。对于R_i不同而△R_(rel)相同的2种添加剂离子,R_i大于Zn^(2+)半径的添加剂掺杂的ZnO压敏电阻的α_(max)值较大。从固溶体的形成机理和能量最低原理方面解释了以上现象。The effect of additive ionic radius （Ri） on the maximum nonlinear coefficient （αmax） of ZnO varistors was investigated. The functional relation between areax and Ri is obtained. In addition, the influences of relative deviation △Rrel of Ri and the zinc ionic radius （R） on the value of amax were also discussed. The results indicate that the relation between αmax and Ri can be described, and the calculated values of amax coincide with the real nonlinear coefficient （area） obtained in some previous work. The value of amax increases with the increase of the relative deviation △Rrel, and αmax approaches a saturation value when the values of ARreI are greater than 30%, beyond which αmax is 〉 64. For the additive ions with different Ri values and the same △Rrel value, the value of amax can be enhanced when Ri is greater than that of zinc ionic. The results obtained can be explained via the formation mechanism of the solid solution and the principle of minimum energy.

关 键 词：氧化锌压敏电阻 添加剂离子半径 最大非线性系数 函数关系 

分 类 号：TQ174[化学工程—陶瓷工业]