Abstract
The effect of the size distribution of metal particles on the process kinetics was studied for the oxi- dation and reduction of cobalt nanoparticles (6-10 nm) in the Co/SiO 2 , Co/Al 2 O 3 , and Co/ZrO 2 systems in both isothermic and temperature-programmed regimes in the temperature range from 280 to 500 K. The average size of the cobalt particles was estimated by measurements of the coercive force and residual magnetization using a vibration magnetometer. It was found that the average particle size increases upon cobalt oxidation and decreases upon cobalt reduction due to changes in the fraction of nonsuperparamagnetic particles with sizes of at least 6.5 nm.
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