Ba_(1-x)Sr_xTiO_3·yLa_2O_3固溶体的合成、结构与性能  

Synthesis, Structure and Properties of Ba1-xSrxTiO3·yLa2O3Solid Solution

作　　者：丁士文[1,2] 马广成[1,2] 孟冬燕 

机构地区：[1]河北大学化学系 [2]衡水师专化学系

出　　处：《河北大学学报（自然科学版）》1998年第2期140-143,共4页Journal of Hebei University(Natural Science Edition)

基　　金：河北省自然科学基金重点资助

摘　　要：用化学掺杂方法合成了Ｂａ１－ｘＳｒｘＴｉＯ３和Ｂａ０９Ｓｒ０１ＴｉＯ３·ｙＬａ２Ｏ３（０≤ｘ≤１，０≤ｙ≤０３）系列固溶体超细粉末。ＸＲＤ证实，当ｘ＝１，ｙ＝０时，为四方晶系ＢａＴｉＯ３纯相，当０＜ｘ＜１，０＜ｙ≤０３时，得到一系列完全互溶固溶体，结果符合Ｖｅｇａｒｄ定律。ＳＥＭ观察粒子为球形，大小均匀，粒度０２～０３μｍ，制陶实验发现，钛酸钡经化学掺杂后，室温介电常数显著提高，当ｘ＝０１，ｙ＝００２时，ε可达３００００，比ＢａＴｉＯ３纯相的室温介电常数提高２０倍。The synthesis、structure and properties of the solid solutions, Ba1-xSrxTiO3·yLa2O3(0≤x≤1,0≤y≤03), were studied The synthesis was achieved by use of precursor method TiCl4 and BaCl2were allowed to react with oxalic acid under 70℃ with the result that BaTiO(C2O4)2·4H2O was obtained After sintering at 850℃, the pure phase of tetragonal system BaTiO3 was obtained Following the same procedure the Ba1-xSrxTiO3·yLa2O3 solid solutions were obtained XRD and d-spacing-composition figures of a series of the solid solutions proved that the compounds are mutual miscible in solid solutions, and the result conform to Vegard′s law The result of making ceramics showed that aduterating with strontium and lanthanum in BaTiO3 pure phase, obviously improved its dielectric constant ε at normal temperature When x is 01 and y is 002, the ceramic body has a dielectric constant up to 30 000

关 键 词：钛酸钡锶镧 固溶体 介电性能 陶瓷 

分 类 号：TQ174.7[化学工程—陶瓷工业]