摘要
以硝酸钡和钛酸四丁酯为原料，在２４０℃的碱液中成功地制备了四方相ＢａＴｉＯ＿３．运用ＸＲＤ、ＤＳＣ和ＩＲ等技术研究了碱度、硝酸根离子、钛源活性、填充度等因素对ＢａＴｉＯ＿３形成、粒度和物相的作用．ＫＯＨ最合宜浓度为１．０ｍｏｌ／Ｌ，碱液中ＢａＴｉＯ＿３是ＢａＯ－ＴｉＯ＿２体系中最稳定的物相，硝酸根离子参与了ＢａＴｉＯ＿３晶体的成核和生长，钛源的高活性和高填充度有利于四方相ＢａＴｉＯ＿３的形成．
Tetragonal BaTiO_3 was prepared hydrothermally in alkaline aqueous solution ofBa(NO_3)_2 and Ti(OC_4H_9)_4 at as low as 240℃. The influence of alkalinity, nitrate ion,reactivity of titanium source and degree of fill on the formation, particle sizes and morpholo-gies was investigated by means of XRD, DSC and IR.The optimum KOH concentration wasabout 1.0 mol/L, in which BaTiO_3 was the stablest phase among the family of BaO-TiO_2.The nitrate ion played a positive role in the formatin and growth of BaTiO_3 fine crystals. TheMgher the reactivity of titanium source and degree of fill is, the easier the formatin of tetragonal BaTiO_3 is.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第1期6-9,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
无机水热合成开放实验室基金
关键词
水热合成
硝酸根
钛酸钡
Tetragonal BaTiO_3, Hydrothermal synthesis. Nitrate ion,Reactive titanumsource
