Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (04): 492-495.doi: 10.3866/PKU.WHXB20060420

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The Influence of Reaction Temperature on the Morphology and Formation Mechanism of Ce2(C2O4)3•10H2O Powders

MEI Yan;HAN Ye-Bin;NIE Zuo-Ren   

  1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, P. R. China
  • Received:2005-08-29 Revised:2005-10-31 Published:2006-04-10
  • Contact: NIE, Zuo-Ren

Abstract: Ce2(C2O4)3•10H2O powders with different morphologies were prepared by homogeneous precipitation method at different temperatures. The source materials were Ce(NO3)3•6H2O and dimethyl oxalate (DMO) with a molar ratio of 1:7.5. The phase, morphology and property of the products were characterized by XRD, TEM and TG-DTA. The results showed that the product was Ce2(C2O4)3•10H2O with a monoclinic structure, and the products′crystallization degree could be enhanced by increasing the reaction temperature. The reaction temperature had direct influences on the particle morphology and size. When the reaction temperatures were 30, 50, 65, 85 ℃, the morphologies were irregular, spherical, rice-like, sheet-like, respectively, indicating the reaction course to be temperature sensitive. The reaction mechanism actually related to nucleation velocity and growth rate of the grains, and it followed LaMer model and crystal distributions and control principle during the crystal formation.

Key words: Reaction temperature, Homogeneous precipitation method, Precursor, Morphology, Mechanism