Kinetics of Nanoscale Cerium Dioxide Prepared by Pechini Process

The crystallization kinetics of nanoscale cerium dioxide particles prepared by Pechini method was investigated by various non-isothermal methods using differential scanning calorimetry. The activation energies for the crystallization calculated from modified Kissinger and Ozawa equations are 19.7 an...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2010-11, Vol.19 (8), p.1220-1224
Main Authors: Zhang, Teng, Tang, Dian, Shao, Yanqun, Yu, Zhenping
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Quality Control
Reliability
Safety and Risk
Tribology
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Summary:The crystallization kinetics of nanoscale cerium dioxide particles prepared by Pechini method was investigated by various non-isothermal methods using differential scanning calorimetry. The activation energies for the crystallization calculated from modified Kissinger and Ozawa equations are 19.7 and 22.4 kJ/mol, respectively, which are much lower than that of solid-state reaction. The Avrami exponent calculated from Ozawa equation is about 1.5, indicating that the nucleation process is controlled by long-range diffusion in the early stage, and the small nuclei grow into various shapes. The nucleation rate decreases as the reaction proceeds. In addition, the kinetics of crystal growth was also studied.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-010-9600-x