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.
出处
《压电与声光》
CAS
CSCD
北大核心
1998年第2期121-124,共4页
Piezoelectrics & Acoustooptics
基金
863计划新材料领域资助
关键词
多层陶瓷电容器
焦绿石
内电极浆料
电容器
multilayer ceramic capacitor, pyrochlore, inner electrode ink, Ag migration
