Synthesis of Rare Earth Ultrafine Powders by Spray Pyrolysis (Ⅰ) Particle Morphology and Formation Mechanism of Y2O3 Powder

Abstract

Abstract: 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)₃·6H₂O were determined by DTAand TG. It was indicated that Y(NO₃)₃·6H₂Owas fully decomposed into Y₂O₃ above 580 ℃ at a heating rate 20 ℃/min. Based on the thermal analysis results, pure cubic phase Y₂O₃ powders with uniform size of 0.50～1.50 μm were prepared by spray pyrolysis from aqueous solution of Y(NO₃)₃·6H₂O. 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.

Key words: Spray pyrolysis, Y₂O₃, Ultrafine powders, Rare earth

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ZHAO Xin-Yu, ZHANG Yu, GU Hong-Chen, GAO Wei . Synthesis of Rare Earth Ultrafine Powders by Spray Pyrolysis (Ⅰ) Particle Morphology and Formation Mechanism of Y₂O₃ Powder[J]. Chem. J. Chinese Universities, 1998, 19(4): 507.

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Synthesis of Rare Earth Ultrafine Powders by Spray Pyrolysis (Ⅰ) Particle Morphology and Formation Mechanism of Y₂O₃ Powder

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