硅酸盐学报

改进草酸盐共沉淀法制备钛酸锶钡粉体

作者：李明利梁辉徐明霞李晓雷季惠明徐廷献

关键词：钛酸锶钡化学共沉淀相组成微观形貌

分类号：TB383.3

出版年,卷(期):页码：2009,37(1):83-86

DOI：

摘要：

以硝酸钡、硝酸锶、草酸和钛酸丁酯为原料,通过向锶钡盐溶液中预先添加适量氨水,采用草酸盐共沉淀法制备了草酸氧钛锶钡[Ba_(0.6)Sr_(0.4)TiO(C_2O_4)_2·4H_2O,BSTO]前躯体粉体,将该前躯体800℃煅烧4h得到钛酸锶钡([Ba_(0.6)Sr_(0.4)TiO_3,BST)粉体。改进的工艺省去了在共沉淀同时添加NH_3·H_2O调节反应体系pH值的过程,使整个工艺方法较之传统工艺更具可操作性。用X射线衍射仪和扫描电镜研究了BST粉体的相组成和微观形貌,并对该工艺所得BST粉体形貌形成机理进行了探讨。结果表明:所制备的BST粉体为高纯立方晶相。粉体呈准球状,粒径为1～2μm.其比表面积达到18.52m~2/g:BST粉体的"菜花"状软团聚形貌是由于单颗粒BSTO粉体高温煅烧发生分解放出气体而形成。

Barium-strontium titanyl oxalate(Ba_(0.6)Sr_(0.4)TiO(C_2O_4)_2·4H_2O,BSTO)precursor powder was prepared from Ba(NO_3)_2, St(NO_3)_2,oxalic acid dihydrate and tetrabutyl titanate by adding quantitative ammonia(NH_3·H_2O)into a solution that contained stoichiometric quantifies of Ba and Sr ions before the co-precipitation procedure.The pyrolysis of BSTO at 800℃for 4 h in air pro- duced homogeneous barium-strontium titanate(Ba_(0.6)Sr_(0.4)TiO_3,BST)powder.Since the quantitative ammonia was added beforehand to adjust the pH value,the modified procedure was simpler than the traditional oxalate co-precipitation procedure.The phase compo- sitions and morphology of the BST powder were characterized by X-ray diffraction and scanning electron microscopy.The mecha- nism of the special morphology of BST powder was investigated in detail.The results show that the BST powder obtained by the aforementioned technique is cubic with quasi-orbicular morphology.The particle diameter is 1-2μm and the specific surface area of the BST powder is 18.52 m~2/g.Moreover,a cauliflower-like morphology of BST powder is formed during the pyrolysis of BSTO at 800℃with the release of gases.

基金项目：

天津市自然科学基金(013603811)资助项目。

作者简介：

参考文献：

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