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Determination of Nucleation and Crystal Growth Kinetics in Hostile Environment – Application to the Tetravalent Uranium Oxalate U(C 2 O 4 ) 2 . 6H 2 O
Author(s) -
BertrandAndrieu Murielle,
Plasari Edouard,
Baron Pascal
Publication year - 2004
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450820508
Subject(s) - nucleation , supersaturation , oxalate , uranium , activation energy , crystal growth , crystal (programming language) , chemistry , kinetics , kinetic energy , thermodynamics , crystallography , inorganic chemistry , materials science , metallurgy , physics , organic chemistry , quantum mechanics , computer science , programming language
A specific apparatus and an original batch method are developed for, respectively, nucleation and crystal growth rate measurements in a hostile environment, such as glove box. Primary nucleation and crystal growth kinetic rates for uranium oxalate are measured over a wide range of temperatures and solution concentrations. The nucleation rate obeys the Volmer‐Weber equation, with activation energies of 182 kJ.mol −1 for the homogeneous nucleation and 102 kJ.mol −1 for the heterogeneous one. The crystal growth rate is first order with respect to the supersaturation and controlled by a surface integration mechanism, characterized by a 29 kJ.mol − 1 activation energy.