用化学共沉SrTiO_3研制钛酸锶铋介质陶瓷  

A Study on Strontitum Bismuth Titanate Ceramic Dielectrics by Chemical Coprecipitation of SrTiO_3

作　　者：金放呜 郑家范 景镇子[1] 游恩溥[1] 

机构地区：[1]西北轻工业学院

出　　处：《电子元件与材料》1994年第3期42-46,共5页Electronic Components And Materials

摘　　要：采用ＸＲＤ、ＳＥＭ、ＥＤＡＸ、粒度分析等手段研究了在（１－ｘ）ＳｒＴｉＯ３ｘＢｉ２Ｏ３·３ＴｉＯ２（简称ＳＢＴ）系统中采用化学共沉ＳｒＴｉＯ３时，Ｂｉ２Ｏ３·３ＴｉＯ２的含量对介电性能和显微结构的影响。发现当其摩尔分数ｘ小于１０％时，结构为单相固溶体，εｒ随ｘ的增加而增加；当ｘ大于１０％时，为复相结构，εｒ开始下降。这个结果与采用ＳｒＣＯ３和ＴｉＯ２固相合成的ＳｒＴｉＯ３烧块时的结果相近，变化趋势一致。但化学共沉ＳｒＴｉＯ３之晶粒细小，杂质少，故使所制介质具有非常优异的介电性能。By means of XRD, SEM, EDAX, particle size analysis, etc. the effect of Bi2O3. 3TiO2 content on dielectric performances and microstructure when SrTiO3 coprecipitated in the system of (l-x)SrTiO3xBi2O3·3TiO2 (SBT) is studied. When mole fraction x<10%, the structure is sigle phase solid solution and εr is increasing with x;when x>10%, the structure is complex phase and begings to drop. The result is close to that when SrTiO3 cake obtained by composing solid phase SrCO3 and TiO2, and changes in the same way. But the former is finer and more pure, and therfore. the dielectrics made of the former have extraordinary dielectric perpormances.

关 键 词：介质陶瓷 钛酸锶铋 化学共沉淀 

分 类 号：TQ174.756[化学工程—陶瓷工业]