The oxidation kinetics of two kinds of polycrystalline nickel particles with an approximate median diameter of 5 μm 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.
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Karmhag et al. (1999) studied this question.
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