The mechanism and kinetics of thermal decomposition of Co3-xNixO4

被引：2
|
作者：
Prochowska-Klisch, B [1 ]
Malecki, A [1 ]
机构：
[1] Stanislaw Staszic Univ Min & Met, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland
来源：
THERMOCHIMICA ACTA | 1999年 / 335卷 / 1-2期
关键词：
heterogeneous kinetics; reaction mechanism; thermal decomposition; cobalt oxide;
D O I：
10.1016/S0040-6031(99)00154-9
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Thermal decomposition of Co3-xNixO4, x = 0.1, 0.15 and 0.2, at oxygen pressures 2.7-20.0 kPa at linearly growing temperature was examined. Decomposition of Co3-xNixO4 was found to be mixed-control diffusion-reaction process. Observed activation energy of studied process strongly depends on the oxygen pressure-dissociation pressure ratio. Comparison of the results obtained with earlier study on electrical conductivity of Co3-xNixO4 showed linear correlation between activation energy of new phase nucleation and activation energy of electrical conductivity. Transport of electrons from oxygen ions to Co3+ ions leading to CoO nuclei formation was found to be one of two rate limiting steps of thermal decomposition of Co3O4 (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：99 / 104
页数：6
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