内电极对BZN基多层陶瓷电容器显微结构的影响  

Influence of Inner Electrode on the Microstructure of BZN Based MLC

作　　者：樊宪平[1] 魏建中[1] 王晓莉[1] 姚熹[1] 

机构地区：[1]西安交通大学电子材料与器件研究所

出　　处：《压电与声光》1998年第2期121-124,共4页Piezoelectrics & Acoustooptics

基　　金：863计划新材料领域资助

摘　　要：研究了银钯内电极对Ｂｉ２Ｏ３－ＺｎＯ－Ｎｂ２Ｏ５（ＢＺＮ）基多层陶瓷电容器（ＭＬＣ）的显微结构的影响及对ＢＺＮ复相陶瓷中立方焦绿石（α相）与单斜焦绿石（β相）的影响。利用扫描电镜观察晶粒的大小与形貌，利用能谱（ＥＤＸ）检测不同晶粒的组成，采用波谱观察Ａｇ迁移的情况，证明在ＭＬＣ中存在Ａｇ迁移。探讨了银钯内电极中Ａｇ对晶粒大小及组成的影响，进一步说明其对ＭＬＣ性能的影响。结果表明，内电极中的Ａｇ破坏了β相的稳定性，有利于α相的生成，这在显微结构上表现为大晶粒比例的增大，在相组成上表现为α相比例增加，在电性能上表现为温度系数变负。In this paper, the influence of inner electrode inks on the microstructure of BZN based multilayer ceramic capacitors(MLC) was investigated. Bi 2O 3 ZnO Nb 2O 5 ceramics is made up of cubic pyro chlore α phase and monoclinic pyrochlore β phase. The microstructure of MLC was studied via a scanning electron microscope (SEM) coupled with energy dispersive X ray spectroscopy(EPS). The results show that silver of silver palladium inner electrode ink migrated into ceramics, influenced the grain size and composition. Silver destroyed the stability of monoclinic pyrochlore β phase, benefited for the formation of cubic pyrochlore α phase. It caused the increase of big grain in microstructure and temperature coefficient to be inclined to negative on dielectric behavior. What’s more, with the increase of temperature, the influence was increased.

关 键 词：多层陶瓷电容器 焦绿石 内电极浆料 电容器 

分 类 号：TM534.103[电气工程—电器]