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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 influence of additive ionic radius (R_i) on the maximum nonlinear coefficient (α_ (max)) of zinc oxide (ZnO) varistor was analyzed. The relationship between α_ (max) and R_i was obtained by data analysis and curve fitting. At the same time, the relative deviation (△ R_ (rel)) between Ri and zinc ion (Zn 2+) (max) value of the law of influence. The results show that α_ (max) and R_i satisfy the specific function, the α_ (max) value calculated by this function can be consistent with the actual nonlinear coefficient (α_ (rea)) reported in the related literature; The value of resistance increases with the increase of ΔR_ (rel). When ΔR_ (rel) exceeds 30%, the increase of ΔR_ (rel) ) Value is greater than 64. For the two kinds of additive ions with the same R_i and the same R_i, the α_ (max) value of the additive-doped ZnO varistor with R_i greater than the Zn_ (2 +) radius is larger. The above phenomenon is explained in terms of the formation mechanism of solid solution and the lowest energy principle.