摘要
对以TiCl4和BaCl2为原料,以NH4HCO3+NH3·H2O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NH4HCO3/BaCl2=1.2,TiCl4/BaCl2=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.
This paper investigated the preparation of ultrafine barium titanate powders by using titanium tetrachloride and barium chloride as starting materials and NH4HCO3+(NH3H2O)-H-. 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/BaCl(2)(.)2H(2)O=1.2; TiCl4/BaCl2-2H(2)O=1 similar to1.01; reaction time=1h; calacination temperature=920 degreesC and calcination time 2h. The addition of some dispersants into the reactant system can obviously reduce particle sizes of the product.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第5期853-860,共8页
Journal of Inorganic Materials