文献类型：期刊文献

英文题名：Synthesis of rare earth ultrafine powders by spray pyrolysis -: (I) -: Particle morphology and formation mechanism of Y2O3 powder

作者：Zhao, XY; Zhang, Y; Gu, HC; Gao, W

机构：[1]E China Univ Chem Technol, Inst Tech Chem & Phys, Shanghai 200237, Peoples R China

年份：1998

卷号：19

期号：4

起止页码：507

外文期刊名：CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000073169500003)】；

语种：英文

外文关键词：spray pyrolysis; Y2O3; ultrafine powders; rare earth

摘要：Spray pyrolysis is a promising process for mass-production of high quality ultrafine powder, However, studies for preparation of rare earth powder by spray pyrolysis are relatively few until now. In this study the spray pyrolysis process was used to prepare Y2O3 ultrafine powder. First, the thermal properties of precursor Y(NO3)(3) . 6H(2)O were determined by DTA and TG, It was indicated that Y(NO3)(3) . 6H(2)O was fully decomposed into Y2O3 above 580 degrees C at a heating rate 20 degrees C/min, Based on the thermal analysis results, pure cubic phase Y2O3 powders with uniform size of 0.50 similar to 1.50 mu m were prepared by spray pyrolysis from aqueous solution of Y(NO3)(3) . 6H(2)O, The particle size can be adjusted by controlling the operation parameters such as droplet size and concentration of precursor solution. It was proposed that the formation mechanism of Y2O3 powders conforms with One-Droplet-One-Particle mechanism(ODOP), This spray pyrolysis process can also be adapted to prepare other kinds of rare earth powders.