Al、Ga离子对ZnO压敏电阻阀片电气性能的调控

Adjustment of Electrical Properties of ZnO Varistor Ceramics by Co-doping with Aluminum and Gallium Ions

为获取高性能氧化锌压敏电阻阀片,研究了采用镓离子、铝离子共同掺杂的氧化锌压敏电阻的电气性能。测试了氧化锌压敏电阻的小电流区以及高场区的伏安特性曲线。在固定的铝离子掺杂浓度下,随着镓离子掺杂浓度的增加,氧化锌压敏电阻的电压梯度以及非线性系数均表现出了先上升后下降的变化趋势,除此之外,泄漏电流表现出了先下降后上升的变化趋势。当硝酸铝和硝酸镓掺杂摩尔分数分别为0.1%和0.72%时,氧化锌压敏电阻可以获取最佳的电气性能,此时压敏电阻表现出了低残压、高非线性系数以及低泄漏电流的特性。该研究有助于装配电气性能优异的氧化锌压敏电阻。

In order to obtain high performance ZnO varistors, the electrical properties of zinc oxide varistors co-doped with aluminum and gallium ions were investigated. The volt-ampere characteristic curves of zinc oxide varistors in small current region and high field region were examined. At a fixed alumina doping concentration, with the increase of gallium doping concentration, the voltage gradient and non-linear coefficient of zinc oxide varistor show a trend of first rising and then decreasing. In addition, leakage current shows a trend of first decrease and then increase. When the doping concentration of aluminum is 0.1% and the doping concentration of gallium oxide is 0.72%, the zinc oxide varistor presents the best electrical performance. At this time, the varistor shows low residual voltage, high non-linear coefficient and low leakage current. This research will help to assemble zinc oxide varistors with excellent electrical properties in the power system.