Influence of Rare Earth on the Electrical Properties and Microstructure of Barium Titanate Ceramics

摘要：

　　The ceramic samples ofBaTiO3+1/2xLn2O3+2mol%TiO2 (0.001 ≤x≤0.01) were prepared,where Ln is Y,Dy,Ho,Er or Y.The influence of rare earth on the resistivity and microstructure of the samples was investigated by the means of XRD,SEM and electric properties testing.The results showed that the resistivity of La-doped sample decreases when x=0.003 compared with the undoped sample.However,the range of dopant concentration with Dy,Ho,Er or Y for semiconducting samples is wider,especially for Y-doping.Minimum resistivity at room temperature was observed when x=0.003,which is named after the critical concentration.The experimental results indicated that below the critical concentration of Dy,Ho,Er or Y,the substitution took place in the barium sublattice with electronic compensation,and the rare earth ions began to substitute for titanium gradually above the critical concentration.For Ho-doped BaTiO3 ceramic,the resistivity jump (PTCR effect) near the Curie temperature was the highest in the case of x=0.003.Fine-grained structure of the sample doped with 0.6mol% Dy led to the increase of breakdown field strength and dielectric constant of ceramic samples.

关键词： Electrical properties Microstructure Rare earth Barium titanate

作者: Yang Wenhu Pu Yongping Chen Shoutian

作者单位: School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi,an 71002 State Key Laboratory of Electrical Insulation for Power Equipment,Xian Jiaotong University,Xian 71

会议类型: 国际会议

会议名称: The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))

会议地点: 长沙

会议语种:英文

页码: 465-468

在线出版日期: 2007-05-10（万方平台首次上网日期，不代表论文的发表时间）