Effect of Ni2O3 Doping on the Electrical Properties and Intrinsic Defect Concentration of ZnO Varistor CeramicsQirui Guo, Lei Zhang, Fanyi Kong, Zhaozi Zhang and Shengtao LiE3S Web Conf., 185 (2020) 01019DOI: https://doi.org/10.1051/e3sconf/202018501019