ZnO－Bi_2O_3－Sb_2O_3BaO系压敏陶瓷组成相的显微分析  

MICROANALYSIS OF CONSTITUTE PHASES IN ZnOBi_2O_3-Sb_2O_3-BaO VARISTOR CERAMIC SYSTEMS

作　　者：陈志雄[1] 黄卓和[1] 石滨 付刚 

机构地区：[1]广州师范学院

出　　处：《应用科学学报》1996年第3期339-344,共6页Journal of Applied Sciences

基　　金：国家自然科学基金

摘　　要：用Ｘ射线衍射及电子探针微区成分分析技术，研究了ＺｎＯ－Ｂｉ２Ｏ３－Ｓｂ２Ｏ３－ＢａＯ为基的压敏陶瓷的显微结构．除通常的ＺｎＯ、Ｂｉ２Ｏ２和Ｚｎ２．３３Ｓｂ０．６７Ｏ４晶相之外，发现了一新的晶界相．分析表明，新的晶界相是固溶有微量Ｚｎ的ＢａＳｂ２Ｏ６晶相；它以颗粒状夹杂于弥散的Ｂｉ２Ｏ３晶界相中；随钡含量增加，ＢａＳｂ２Ｏ６相的数量增多，粒径也增大，相应地Ｚｎ２．３３Ｓｂ０．６７Ｏ４相的数量则减少．同时还发现，晶界层中组分及结构的这种变化，使压敏陶瓷在长期电负荷下工作的稳定性得到改善．The miorostructure of varistor ceramics based on ZnO-Bi2O3-Sb2O3BaO systems has been investigated by XRD and EPMA techniques. A new grain boundary phase in which trace Zn tobe, dissolved is found besides the known ZnO,Bizoa and Zn2.33Sb0.67O4 crystal phases, it is the BaSb3O6 crystal phase. This phase in grain forms mixes with the dispersed Bi2O3 grain boundary phase. With the increase in the amount of barium additive, it increases in amount and grows in grain size, while Zn2.33 Sb0.67O4 decreases in amount. It is also found that the long life stability of the varistor ceramics under a loaded voltage is improved due to the change of the composition and the microstructure in the intergranular layer.

关 键 词：压敏陶瓷 显微分析 氧化锌 氧化铋 氧化锑 

分 类 号：TQ174.756[化学工程—陶瓷工业] TM282[化学工程—硅酸盐工业]