摘要：介绍了一种用草酸共沉淀法合成高纯超细钛酸钡（BaTiO₃）的方法，并对影响最终产品性能的几个主要因素，如加料速度、配料比、洗涤情况、干燥煅烧条件等进行了探讨．指出通过控制工艺条件完全可以稳定地制备出纯度＞99.5％、粒度不超过1μｍ的球形钛酸钡。

关键词：高纯超细粉料;钛酸钡;液相共沉淀;电子陶瓷;PTC材料;

Abstract：Based on analysis and deduction to Stoke's falling principle, some questions of particle size measurement in Stoke's falling principle were probed and analyzed. The calculation formsof maximum measured particle diameter and minimum measured particle diameter in the principlewere put forward.It will attach importance to pratical application.

Key words：particle size measurement; Stoke's falling principle; fluid mechanics; Brownianmovement