无机材料学报

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共沉淀法制备钛酸钡微粉的研究

全学军1; 李大成2   

  1. 1. 重庆工学院材料科学与工程系, 重庆 400050; 2。 四川大学无机非金属材料系, 成都 610065
  • 收稿日期:2000-08-07 修回日期:2000-09-20 出版日期:2001-09-20 网络出版日期:2001-09-20

Preparation of Ultrafine Barium Titanate Powder by Coprecipitation

QUAN Xue-Jun1; LI Da-Cheng 2   

  1. 1。 Department of Meterials Science and Engineering Chongqing Institute of Technology; Chongqing 400050; China; 2。 Department of Inorganic Materials; Sichuan University Chengdu 610065; China
  • Received:2000-08-07 Revised:2000-09-20 Published:2001-09-20 Online:2001-09-20

摘要: 对以TiCl和BaCl为原料,以NHHCO+NH·HO作沉淀剂,制备钛酸钡粉末的过程进行了详细的热力学分析,找出了合成钛酸钡的条件和范围,详细地讨论了反应方式和前躯体洗涤条件.实验研究了反应物钡钛比,终点pH值,煅烧温度,以及分散剂对产物理化性能的影响.结果表明:在NHHCO/BaCl=1.2,TiCl/BaCl=1-1.01,充分搅拌反应1h,煅烧温度920℃,煅烧时间2h条件下,可以制得较理想的产物.在反应体系中加入适量分散剂可以明显降低产物的粒径.

关键词: 共沉淀法, 钛酸钡

Abstract: This paper investigated the preparation of ultrafine barium titanate powders by using titanium tetrachloride and barium chloride as starting materials and
NH4HCO3+NH3·H2O as the precipitant. First of all, a thermodynamic analysis was made in detail to find out optimum synthesis
conditions. Experiment results show that the Ba/Ti ratio of starting materials, calcination temperature, pH value of solution, have a close effect
to the physical and chemical performances of the obtained powders. The best conditions are NH4HCO3/BaCl2·2H2O=1.2; TiCl4/BaCl2·2H2O=1~1.01; reaction time=1h; calacination temperature=920℃ and calcination time 2h. The addition of some
dispersants into the reactant system can obviously reduce particle sizes of the product.

Key words: coprecipitation, barium titanate powders, synthesis

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