Oxidation kinetics of small nickel particles

被引：54

作者：

Karmhag, R

Niklasson, GA

Nygren, M

机构：

[1] Univ Uppsala, Dept Mat Sci, S-75121 Uppsala, Sweden

[2] Univ Stockholm, Arrhenius Lab, Dept Inorgan Chem, S-10691 Stockholm, Sweden

来源：

JOURNAL OF APPLIED PHYSICS | 1999年 / 85卷 / 02期

关键词：

D O I：

10.1063/1.369244

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The oxidation kinetics of two kinds of polycrystalline nickel particles with an approximate median diameter of 5 mu m but with different morphology, has been studied by thermogravimetric measurements in the temperature range 573-973 K. The oxidation was found to be thermally activated with an apparent activation energy of about 1.5 eV. The kinetics was compared with a homogeneous field, coupled-currents theory for oxidation of spherical metal particles. Calculations using a median particle size or a distribution of particle sizes do not give satisfactory fits to the experimental data. Possible explanations of the deviations in terms of space charge, grain boundary diffusion, grain growth, and sintering are discussed. (C) 1999 American Institute of Physics. [S0021-8979(99)08502-3].

引用

页码：1186 / 1191

页数：6

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