稀土氧化物掺杂ZnO-Bi_2O_3系压敏陶瓷的介电特性  

The Dielectric Characteristics of Rare Earth Oxides Adulterate with ZnO-Bi_2O_3 Series Varistor Ceramics

作　　者：成鹏飞[1] 李盛涛[2] 

机构地区：[1]西安工程大学理学院,西安710048 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《电瓷避雷器》2010年第3期20-22,共3页Insulators and Surge Arresters

基　　金：西安工程大学博士科研启动基金(编号:No.BS0814);国家杰出青年基金(编号:No.50625721)的资助

摘　　要：在不同温度下测量了稀土氧化物Gd2O3、Ce2O3掺杂ZnO-Bi2O3系压敏陶瓷的介电频谱,发现稀土氧化物的掺杂引起介电损耗显著增大。通过理论计算发现稀土氧化物掺杂后锌填隙和氧空位浓度显著增大,而耗尽层宽度明显减小。因此认为稀土氧化物引起施主性本征缺陷浓度的增大,导致Schottky势垒变薄,从而引起泄露电流的增大及非线性指数的下降。Dielectric frequency spectrum of rare earth oxides Gd2O3, Ce2O3 aduherate with ZnO- Bi2O3 series varistor ceramics at different temperatures were measured. It is found that the dielectric loss is increases apparently caused by adulteration of rare earth oxides. Through theoretically calculation it is believed that after the adulteration of rare earth oxides, the zinc gap filling and oxygen filler concentration increased significant, and width of depletion layer decreased significatly. Therefore, more electrons will jump over Schottky barrier at grainboundaries and the leak current will increases and non-linear exponent will decreases inevitably.

关 键 词：ZNO压敏陶瓷 介电谱 稀土氧化物 

分 类 号：TM28[一般工业技术—材料科学与工程]