Hydrogen Reduction of γIrradiated Nickel Oxide
Faculty of Engineering, Hokkaido University, Sapporo
1966 Volume 15 Issue 150 Pages 146-150
Details
1966 Volume 15 Issue 150 Pages 146-150
Hydrogen reduction experiments were carried out on the unirradiated and the γ-irradiated nickel oxide (NiO) in order to interpret their mechanism at the initial stage of reduction, i.e. the induc-tion period. The reduction velocities were found to decrease with the radiation dose, being remark-able over a total dose of 5.8×107γ. These phenomena are similar to the increase in the excess oxygen in the nickel oxide by irradiation.
From the experimental results of the effect of the preevacuation at various temperatures on the initial reduction kinetics, it was concluded that the reduction kinetics of nickel oxide was associated with the amount of surface excess oxygen by γ-irradiation. It was suggested that the increase ofinduetion period by irradiation was due to the water vapor on the surface of nickel oxide acting as a barrier-layer against the diffusion of hydrogen.
