摘要
本文对液相合成ＢａＴｉＯ＿３的前驱体草酸氧钛钡采用ＩＲ、ＸＲＤ分析手段跟踪不同分解温度下其组分及晶型的变化规律，结合ＭＲ—ＧＣ、ＤＴＡ和ＴＧ等分析结果，阐述了草酸氧钛钡的热分解机理。分析结果表明前驱体在２００℃之前脱除四份结晶水成无定形，２２０～４７０℃时是无水草酸氧钛钡分解为ＢａＣＯ＿３和ＴｉＯ＿２并放出ＣＯ、ＣＯ＿２气体，７５０℃时是固相ＢａＣＯ＿３和ＴｉＯ＿２之间的反应生成立方晶型的ＢａＴｉＯ＿３，在１０００℃时已转变为单纯的四方晶型ＢａＴｉＯ＿３。
Changing of composition and crystalline structure of BaTiO(C_2O_4)_2·4H_2O(precursor of BaTiO_3)withdifferent decomposition tempreture is analysized by IR and XRD. The results,together with MR GC, DTA andTG,indicate that the thermal decomposition mechanism of BaTiO(C_2O_4)_2·4H_2O is amorphous:below 200℃due to dehydrolyzing 4H_2O from the precursor; from 220～470℃,BaCO_3 and TiO_2 are produced withdecomposing of BaTiO (C_2O_4)_2, releasing CO and CO_2 simultaneously ; about 750 ℃, cubic BaTiO_3 crystal isobtained through particular solid reaction between BaCO_3 and TiO_2.If calcinated to 1000 ℃,the cubic BaTiO_3crystal would transform to tetragonal BaTiO_3 crystal.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
1995年第5期4-7,13,共5页
Bulletin of the Chinese Ceramic Society
关键词
钛酸钡
草酸氧钛钡
热分解
电子陶瓷
液相合成
barium titanate,barium titanyl oxalate tetrahydrate,thermal decomposition.
