Kinetic Studies of LaCoO_(3-δ) Preparation from Solid State Reactions

Baijun Yan; Jiayun Zhang; Jianhua Liu

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Kinetic Studies of LaCoO_(3-δ) Preparation from Solid State Reactions

机译：固态反应制备LaCoO_（3-δ）的动力学研究

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The present paper deals with kinetics of LaCoO_(3-δ) preparation with La_2O_3 and Co_3O_4 powder mixture. High temperature X-ray diffraction measurements were carried out in air, combining with TG-DSC technique, between 298K. and 1473K. The results have exhibited the reaction between La_2O_3 and CO_3O_4 starting around 1093 K, and no intermediate compound forming between them. The kinetic study of LaCoO_(3-δ) preparation was further performed using pressed La_2O_3 and Co_3O_4 powder mixture compacts under isothermal calcinations at several temperatures between 983K and 1223K. Three-dimensional diffusion models have been employed to describe the isothermal synthesis process satisfactorily. The resultant activation energy obtained was 233.6 kJ/mol in average. Lanthanum ion diffusion in the product layer could be the rate-controlling step of the overall process.

机译：本文研究了La_2O_3和Co_3O_4粉末混合物制备LaCoO_（3-δ）的动力学。结合TG-DSC技术，在空气中进行了298K之间的高温X射线衍射测量。和1473K。结果显示，La_2O_3和CO_3O_4之间的反应始于1093 K，并且在它们之间没有形成中间化合物。使用La_2O_3和Co_3O_4粉末混合物压制物在等温煅烧下，在983K和1223K之间的几个温度下，进一步进行LaCoO_（3-δ）制备的动力学研究。已使用三维扩散模型令人满意地描述了等温合成过程。所得的活化能平均为233.6kJ / mol。镧离子在产物层中的扩散可能是整个过程的速率控制步骤。

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来源
《High temperature materials and processes》 |2004年第3期|p.163-175|共13页
作者
Baijun Yan; Jiayun Zhang; Jianhua Liu;
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作者单位

Department of Physical Chemistry, University of Science and Technology Beijing Beijing 100083, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类金属学与热处理;
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Kinetic Studies of LaCoO_(3-δ) Preparation from Solid State Reactions

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