Abstract SnO2 voltage-sensitive ceramics is a kind of ceramic with nonlinear characteristics, which is the most promising new material for high voltage and large current varistors. At present, the SnO2 varistors still have the problems of large leakage current and relatively low nonlinear coefficient. For the low leakage current and high nonlinear coefficient of the varistors, in this paper, the influence of different amounts of Ni2O3 on the electrical properties and microstructure of SnO2·MnO2·ZnO·Ta2O5 system was studied. The formation mechanism of the electrical characteristics of SnO2 varistors was studied by measuring current-voltage, SEM, capacitor-voltage, X-ray diffraction and ac impedance spectra of the samples. It was found that the electrical characteristics of the samples were the best (the voltage gradient was 563V/mm, the leakage current was 8.87 μA/cm2, the nonlinear coefficient was 38.5), when 0.2 mol % Ni2O3 was added. This study has reference significance for exploring SnO2 varistor with high nonlinear and low leakage current.

中文翻译：

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Ni2O3掺杂SnO2压敏陶瓷的电学特性

摘要 SnO2压敏陶瓷是一种具有非线性特性的陶瓷，是最有前途的高压大电流压敏电阻新材料。目前，SnO2压敏电阻还存在漏电流大、非线性系数较低的问题。针对压敏电阻器漏电流低、非线性系数高的问题，本文研究了不同Ni2O3用量对SnO2·MnO2·ZnO·Ta2O5体系电性能和微观结构的影响。通过对样品的电流-电压、扫描电镜、电容-电压、X射线衍射和交流阻抗谱的测量，研究了SnO2压敏电阻电特性的形成机理。发现样品的电特性最好（电压梯度为563V/mm，当添加 0.2 mol % Ni2O3 时，漏电流为 8.87 μA/cm2，非线性系数为 38.5)。该研究对探索高非线性、低漏电流的SnO2压敏电阻具有参考意义。