Yb(NO3)3·6H2O的差热和热重分析表明,Yb(NO3)3·6H2O经脱水和热分解在460℃以上完全分解为Yb2O3。在此基础上,以Yb(NO3)3·6H2O为前驱体采用喷雾热分解法制备出粒度为050～150μm的单相立方晶系球形Yb2O3粉末。本喷雾热分解法同样适用于其他稀土超细粉末的制备,粒子粒径可以通过调节液滴尺寸和溶液浓度等操作条件进行控制。 Differential thermal analysis and thermogravimetric analysis of Yb (NO3) 3 · 6H2O show that Yb (NO3) 3 · 6H2O decomposes completely into Yb2O3 above 460 ℃ by dehydration and pyrolysis. On this basis, Yb (NO3) 3 · 6H2O precursor was prepared by spray pyrolysis of single-phase cubic Yb2O3 powder with a particle size of 050 ~ 150μm. The spray pyrolysis method is equally applicable to the preparation of other rare earth ultrafine powder, the particle size can be controlled by adjusting the operation conditions such as droplet size and solution concentration.