【作者】 王天国； 邵刚勤； 段兴龙； 史晓亮；

【Author】 WANG Tian-guo SHAO Gang-qin DUAN Xing-long SHI Xiao-liang (State Key Laboratory of Advanced Technology for Materials Synthesis & Processing,Wuhan University of Technology,Wuhan 430070,China)

【机构】 武汉理工大学材料复合新技术国家重点实验室；

【摘要】 制备了不同掺量 SrCO₃的 WO₃-CeO₂系列低压压敏陶瓷．研究结果表明：随着 SrCO₃掺量的增加, WO₃晶粒尺寸逐渐减小,样品的压敏电压明显增大,非线性系数 a 先增大后减小．在 SrCO₃掺量为0．5%（摩尔分数）时,样品表现出较好的压敏性能,其压敏电压可低至9．1V/mm,非线性系数高至3．3．探讨了 Sr 元素掺杂的作用机理。更多还原

【Abstract】 The WO₃-CeO₂ based low-voltage varistor ceramics were prepared by doping with different content of SrCO₃. Results show that when the SrCO₃ content increased,the size of WO₃ grain decreased and the breakdown voltage of WO₃ varistor ceramics increased,while the nonlinear coefficient（α）of samples first increased and then decreased.The sample with an optimal composition of WO₃-0.1 mol% CEO₂-0.5 mol% SrCO3 exhibits a low breakdown electrical field of 9.1 V/mm and a nonlinear coefficient（a）of 3.3.The dopant mechanism of SrCO₃ was discussed.更多还原