Abstract
Abstract The rate and mechanism of oxidation of ferrous sulfide was studied by means of a spring balance and X-ray diffraction analysis over the temperature range from 500°C to 700°C. The conclusion reached is as follows : (1) Complete oxidation, in which only the formation of oxides proceeds, begins at 600°C. (2) At the initial stage of oxidation, a slight increase of weight is found. It was observed by X-ray that the deficiency of cation in ferrous sulfide occurs in this stage. This may be due to the formation of oxide on the surface rather than to chemisorption, which is accompanied by creation of cation vacancies in ferrous sulfide crystal. (3) Above 600°C, the rate of oxidation does not change with temperature, so the rate-determining factor is diffusion of gas. Since the observed rate of oxidation depends upon the quantity of the sample, the diffusion in the bed of sample may determine the rate.
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