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首页> 外文期刊>Journal of Materials Engineering and Performance >Kinetics of Nanoscale Cerium Dioxide Prepared by Pechini Process
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Kinetics of Nanoscale Cerium Dioxide Prepared by Pechini Process

机译：Pechini法制备纳米级二氧化铈的动力学

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摘要

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.
机译：用差示扫描量热法通过各种非等温方法研究了用Pechini法制得的纳米二氧化铈颗粒的结晶动力学。根据改进的基辛格方程和小泽方程计算的结晶活化能分别为19.7和22.4 kJ / mol，远低于固态反应的活化能。由Ozawa方程计算得出的Avrami指数约为1.5，这表明成核过程在早期受远程扩散控制，并且小核长成各种形状。随着反应的进行，成核速率降低。另外，还研究了晶体生长的动力学。

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