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.%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500L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.
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