CeO_2对氧化锌压敏阀片电位梯度的影响  

Effect of Cerium Oxide on the Electrical Potential Gradient of the Zinc Oxide Varistors

作　　者：唐俊[1] 严群[1] 陈家钊[1] 涂铭旌[1] 

机构地区：[1]四川大学金属材料系,四川成都610065

出　　处：《稀土》2003年第3期27-30,共4页Chinese Rare Earths

摘　　要：研究了稀土氧化物CeO2对氧化锌压敏阀片电位梯度的影响规律。实验结果表明:微量的CeO2能够提高氧化锌压敏阀片的电位梯度,当CeO2含量为0.06%(摩尔分数)时,可提高电位梯度20%。通过扫描电镜、能谱仪和X射线衍射分析发现,CeO2以独立相形态存在,并与尖晶石相协同作用,钉扎在晶界,形成晶界电阻层,阻碍晶界运动,减小氧化锌晶粒尺寸,使晶粒分布均匀致密,从而提高氧化锌压敏阀片的电位梯度,改善其综合性能。The effect of cerium oxide on the electrical potential gradient of zinc oxide varistors is explored in this paperRusults of this study indicated that microadding cerium oxide can improve the electrical potential gradient of zinc oxide varistorsWhen the cerium oxide content is 006%(mol),the electrical potenial gradient can improve 20%Microanalysis via SEM,EPD,XRD indicated that cerium oxide is a independent phase and lies in the grain boundary,forms the intergranular resistance layers with Zn233Sb067O4,hinders the movement of grain boundary,which reduce the zinc oxide grain size,and make the grain well-distributed,greatly improve the electrical potential gradient and comprehensive properties of the zinc oxide varistors

关 键 词：氧化锌压敏阀片 稀土氧化物 电位梯度 晶粒尺寸 

分 类 号：TM283[一般工业技术—材料科学与工程]