Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (08): 942-946.doi: 10.3866/PKU.WHXB20060807

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Thermal Decomposition Kinetics of Complexes of Rare Earths (RE = Nd, Sm) with Amino Acid RE(Val)Cl3•6H2O

WU Xin-Min;LIU Jian-Hua;LI Wei;QI Chuan-Song   

  1. Department of Material and Chemical Engineering, Beijing Institute of Petro-chemical Technology, Beijing 102617, P.R. China
  • Received:2006-02-09 Revised:2006-03-07 Published:2006-08-04
  • Contact: WU Xin-Min E-mail:wuxinmin@bipt.edu.cn

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Abstract: Some complexes of rare earth and valine were synthesized: monovalino -hexaquo-neodymium, samarium. Their property was determined by the EDTA titration, element analysis, infrared spectrum, thermogravimetry, differential thermal analysis and melting point measure. The thermal decomposition mechanism had been deduced, and non-isothermal kinetics of the thermal decomposition of the complexes also had been studied with the methods of Achar and Coats-Redfern. These parameters were carried out that the activation energy (E ), the values of logarithm of preexponential factore {ln(A/s-1)} and the kinetics equation of the complexes’ first step reaction which belong to the stagy of water-loss and the framework of amino acid breaking down.

Key words: Rare earths complexes, RE(Val)Cl3·6H2O(RE = Nd，Sm), Thermal decomposition mechanism, Activation energy, Kinetics equation