Anomalous temperature effect of nonlinearity of WO_3 varistor doped with Al_2O_3

作     者：WANG Yu, Z. Aburas and YAO KailunDepartment of Physics , Huazhong University of Science and Technology, Wuhan 430074, China 

作者机构：Department of Physics Huazhong University of Science and Technology Wuhan China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：1999年第44卷第7期

页      面：671-672页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：Nat- ural Science Foundation of Hubei Pruvince  (J028) 

主　　题：Anomalous temperature effect of nonlinearity of WO3 varistor doped with Al2O3 Al 

摘      要：MAKAROV and Trontelj first reported the WO3-based low voltage varistor material doped with MnO2 and Na2CO3 in 1994. This material is worth further study because of its low threshold voltage （ 2O3 can obviously improve the nonlinearity of WO3-MnO2-Na2CO3 series with nonlinear coefficient α≈ 2,and a may be higher than 5 when the amount of Co2O3 is 1% （mole percentage）. However, the nonlinear characteristic almost vanished when 0.5% Al2O3 was doped into this system at room temperature, and Al2O3 showed very stable