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Influence of CBS Doping on Dielectric Properties of BaTiO_3 Ceramics

YAO Bin,ZHANG Shu-ren,ZHOU Xiao-hua,TANG Bin(School of Microelectronic and Solid State Electronics,University of Electronic Science and Technology,Chengdu 610054,China)  
Investigated were the microstructure and dielectric properties of BaTiO3(BT)-Nb2O5-ZnO system doped with CBS glass-ceramic.The results reveal that when the amount of CBS is small,it assembles at grain boundary.And the barium titanate grains are coated with glass as the amount of CBS increases.The various effects of different amount of CBS doping on the BT ceramics can be explained by the volume proportion change of grain core and grain shell in the core-shell structure.After the SEM photographs were analyzed,it proves that εr has close relationship with the grain size of BT ceramics and the volume proportion and distribution of the glass phase.By optimizing composition and technical process,the BaTiO3 ceramics sintered at 1 150℃ into the atmosphere have perfect dielectric properties:εr 25℃1 300,tgδ≤1.0×10-2,ρ≥1011?·cm,ΔC/C≤ ±10%(-55~+155℃).This material is promising for the preparation of X8R MLCC.
【Fund】: 总装预研基金资助项目
【CateGory Index】: TM282
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