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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[Ba0.6Sr0.4TiO(C_2O4)2·4H_2O,BSTO]前躯体粉体,将该前躯体800℃煅烧4h得到钛酸锶钡([Ba0.6Sr0.4TiO3,BST)粉体。改进的工艺省去了在共沉淀同时添加NH3·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18.52m2/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。
Abstract：Barium-strontium titanyl oxalate(Ba0.6Sr0.4TiO(C_2O4)2·4H_2O,BSTO)precursor powder was prepared from Ba(NO3)2, St(NO3)2,oxalic acid dihydrate and tetrabutyl titanate by adding quantitative ammonia(NH3·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(Ba0.6Sr0.4TiO3,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 m2/g.Moreover,a cauliflower-like morphology of BST powder is formed during the pyrolysis of BSTO at 800℃with the release of gases.
[1]ZHOU Liqin,VILARINHO P M,BAPTISTA J L.Dependence of the structural and dielectric properties of Ba_(1-x)Sr_xTiO_3 ceramic solid solu- tions on raw material processing[J].J Eur Ceram Soc,1999,19(11): 2015-2020.
[2]GUO H L,GAO W,YOO J.The effect of sintering on the properties of Ba_(0.7)Sr_(0.3)TiO_3 ferroelectric films produced by eleetrophoretic deposi- tion[J].Mater Lett,2004,58(7-8):1387-1391.
[3]杨文，常爱民，杨邦朝．晶粒尺寸对Ba_(0.80)Sr_(0.20)TiO_3陶瓷介电铁电特性的影响[J]．硅酸盐学报，2002，30(3)：390-394．YANG Wen,CHANG Aimin,YANG Chaobang.J Chin Ceram Soc(in Chinese),2002,30(3):390-394.
[4]KHOLLAM Y B,DESHPANDE S B,POTDAR H S,et al.Simple oxalate precursor route for the preparation of barium-strontium titanate: Ba_(1-x)Sr_xTiO_3 powder[J].Mater Charact,2005,54(1):63-74.
[5]WU Di,LI Aidong,LIN Huiqin,et al.Preparation of(Ba_(0.5)Sr_(0.5))TiO_3 thin films by sol-gel method with rapid thermal ennealing[J].Appl Surf Sci,2000,165(4):309-314.
[6]曾华荣，瞿翠凤，姚春华，等．溶胶-凝胶法制备Ba_xSr_(1-x)TiO_3热释电陶瓷材料[J]．无机材料学报，1999，2(14)：101-107．ZENG Huarong,QU Cuifeng,YAO Chunhua,et al.J Inorg Mater(in Chinese),1999,2(14):101-107.
[7]苗鸿雁，周耀辉，朱刚强．钛酸锶钡压电陶瓷超细粉体的水热法合成[J]．无机盐工业，2005，37(5)：15-17．MIAO Hongyan,ZHOU Yaohui,ZHU Gangqiang.Inorg Chem Ind(in Chinese),2005,37(5):15-17.
[8]杨忠波，常爱民，赵青，等．纳米晶钛酸锶钡(Ba_(0.5)Sr_(0.5)TiO_3)粉体的微波水热合成[J]．材料科学与工程学报，2006，24(4)：578-581．YANG Zhongbo,CHANG Aimin,ZHAO Qing,et al.J Mater Sci Eng (in Chinese),2006,24(4):578-581.
[9]BRANKOVIC G.BRANKOVIC Z,GOES M S,et al.Barium stron- tium titanate powders prepared by spray pyrolysis[J].Mater Sci Eng, 2005,122(2):140-144.
[10]SUASMORO S,PRATAPA S,HARTANTO D,et al.The characteriza- tion of mixed titanate Ba_(1-x)Sr_xTiO_3 phase formation from oxalate coprecipitated precursor[J].J Eur Ceram Soc,2000,20(3):309-314.
[11]KHOLLAM Y B,BHORASKAR S V,DESHPANDE S B,et al. Simple chemical route for the quantitative precipitation of barium- strontium titanyl oxalate precursor leading to Ba_(1-x)Sr_xTiO_3 powder[J]. Mater Lett,2003,57(13-14):1871-1879.
[12]KHOLLAM Y B,POTDAR H S,DESHPANDE S B,et al.Synthesis of star shaped Ba_(1-x)Sr_xTiO_3(BST)powders[J].Mater Chem Phys, 2006,97(2-3):295-300.
[13]SCHREY E Effect of pH on the chemical preparation of Barium- Strontium titante[J].J Am Ceram Soc,1965,48(8):401-405.
基本信息:
中图分类号:TB383.3
引用信息:
[1]李明利,梁辉,徐明霞,等.改进草酸盐共沉淀法制备钛酸锶钡粉体[J].硅酸盐学报,2009,37(01):83-86.
基金信息:
天津市自然科学基金(013603811)资助项目。
2009-01-15
2009-01-15