Diffusion Of Oxygen Atoms Research Articles

The Evolution of Gas from Nickel Plate

The quantitative analyses of gas, evoled from commercial and electrolyticnickel were carried out by means of the micro-gas analyser, whose principle is similar to Prescott and Morrison's apparatus. The main components of the evolved gas were carbon mono-oxide, carbon dioxide, hydrogen, water vapour and nitrogen. The rate of evolution of carbon oxide was found to be determinated by the diffusion of oxygen atoms through metal. A considerably large amount of gas was evolved from the electrolytic nickel, but below 450°C only hydrogen was released, while at higher temperature some other kinds of gas were extracted. The activation energy for degassing of hydrogen weire about 5 Kcal/g. atom and 12 Kcal/g. atom for low and high temperature regions respectively. This suggests that there are two mechanisms for the diffusion of hydrogen: one is the normal lattice diffusion and the other is the rift or crystal boundary diffusion.