Abstract
Methods are described to extract the grain boundary diffusion coefficient from experimental measurements of surface concentration of a diffusing species. For Type C kinetics, where bulk transport is negligible, easily used exact analytical solutions are available for infinite source and zero or infinite sink boundary conditions. For infinite or finite source and finite sink boundary conditions, the surface concentration is described by an exponential curve if the surface capacity is larger than the grain boundary capacity. The finite sink analysis has been applied to chromium diffusing in platinum, and was found to equal . For Type B kinetics, where bulk transport is not negligible, equations developed by Wuttig and Birnbaum may be used with a general criterion for approximating the bulk lattice flux developed in the present work. These solutions are available for infinite and finite source and infinite and zero boundary conditions. For an infinite source and sink condition, was calculated for gold in platinum by a “time‐of‐penetration” measurement and was shown to equal .
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