Effects of La2O3 and Nb2O5 doping on the dielectric properties of Ba0.9Sr0.1Ti03 ceramics
Ba0.9Sr0.1TiO3 ferroelectric ceramics with dopants of La2O3(0.0.1,0.1,0.2 mol％)and Nb2O5(0,0,0.1,0.1 mol％) were prepared in solid state process.The double donor substitutions can weaken lattice size effect by the two different size substitutions.XRD method was used to analyze the crystal structure of the samples,and SEM was used to observe the topography,grains size and ceramics density.The results of dielectricfrequency relation indicate that when the contents of La2O3 and Nb2O5 are both 0.10 mol％,the permittivity can reach to 150000,and the dielectric loss keeps only 0.118.When the total donor content is lower than 0.40 mol％,compensation effect is dominated by electrons.The giant permittivity is attributed to electrons inside grain and insulated grain boundary.When the dopant content is higher than 0.40 mol％,the compensation effect is dominated by the host cation vacancies.The permittivity decreases rapidly with the increase of the donor concentration.
Barium strontium titanate Double donor dopant Dielectric property
Wei CHEN Shaohua QU Wanqiang CAO
Xiangfan University,Xiangyang 441053,China Ministry-of-Education Key Laboratory for the Green Prepar Xiangfan University,Xiangyang 441053,China Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materia
国际会议
2012 2nd International Conference on Advanced Material Research(2012 第二届先进材料研究国际会议 ICAMR2012)
成都
英文
453-456
2012-01-07（万方平台首次上网日期，不代表论文的发表时间）