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Equations for the diffusion through gas-solid interface reaction were summarized for spherical model. An analytical solution for the concentration distribution in the solid where the interface reactio...n rate as well as the diffusion rate in solid controls the diffusion amount was derived. A self-diffusion coefficient of oxygen ion was determined for a ThO_2-CaO solid solution using an isotope exchange technique and the concentration distribution profile is calculated using the solution derived. It was clarified that the concentration gap at the interface decreases with the advance of diffusion annealing time. Cautions to obtain precise diffusion coefficients using gas-solid isotope exchange technique were discussed.show more
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