四方相钛酸钡超细粉体的水热合成研究

采用水热法在温和条件下制备出分散性好的四方相钛酸钡超细粉体。通过考察反应物钡（Ba2+）与钛（Ti4+）物质的量比、反应温度、反应时间、反应体系碱度等条件对制备四方相钛酸钡的影响，得出最佳制备条件。在反应物Ba2+与Ti4+物质的量比为2.0∶1、强碱性条件、反应温度为180 ℃、反应时间为72 h条件下，可以制备出粒径在80~140 nm的四方相钛酸钡（BaTiO3）超细粉体。采用化学分析法测得钛酸钡样品Ba与Ti物质的量比为0.995~1.005。在500 L高压釜中进行了工业放大实验，采用工业原料在动态条件下制备出粒径为100~200 nm的四方相钛酸钡超细粉体。

Study on hydrothermal synthesis of tetragonal barium titanate superfine powders

Well dispersed tetragonal BaTiO3 superfine powders were prepared by hydrothermal method under milder conditions.Influences of reaction conditions,such as amount-of-substance ratio of Ba2+ to Ti4+,reaction temperature,time,and alkalinity of the reaction system,on hydrothermal synthesis of tetragonal BaTiO3 nano-powder were investigated systematically and the optimized preparation conditions were obtained.Tetragonal BaTiO3 powders with particle size of 80～140 nm could be prepared when the reactants with amount-of-substance ratio of Ba2+ to Ti4+ of 2.0∶1,reacted at 180 ℃ for 72 h under strong alkali condition.Chemical analysis result showed the amount-of-substance ratio of barium to titanium of the sample was at 0.995～1.005.Tetragonal BaTiO3 powders with particle size of 100～200 nm were successfully prepared with the industrial materials at the rotating condition in 500 L high pressure reactor in industrial scale experiment.