Effects of Sintering Temperature on Microstructure and Properties in TiO2 Varistor Ceramics

摘要：

　　The effects of sintering temperature on microstructure,micro-composition,barrier structure and electrical properties of TiO2 varistors ceramics were investigated.The microstructures and chemical compositions of grains in TiO2 ceramics were measured by SEM and EDS.Based on the thermo electronic emission theory,Grain boundaries barrier structure was calculated by analyzing electrical properties of samples.The sample sintered at 1350℃ exhibits better microstructure and properties.The grains size of the TiO2 sample sintered at 1350℃ is about 15μm,and other electrical properties are as follows:solid solubility of donor doping Nb5+ cation solute in TiO2 grains of 1.49mol%,barriers height of 0.28ev,barriers width of 48nm,varistor voltages of 5.25V/mm,non-linear coefficient of 4.2 and relative dielectric constant of 1.1 × 104.

关键词： Ceramics Varistor solid solubility Grain boundary barrier structure

作者: Jikang Yan Guoyou Gan Jinghong Du Jialin Sun

作者单位: Faculty of Materials Sience and Engineering, Kunming University of Science and Technology,Kunming, Yunnan, 650093, China

会议类型: 国际会议

会议名称: The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))

会议地点: 哈尔滨

会议语种:英文

页码: 324-328

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）