It is shown that nonlinear segregation effects (saturation, interaction of species) lead to nonlinear grain-boundary penetration plots. If the diffusion penetration depth is larger than a critical value, the concentration profiles become linear. The sign of the curvature and the deviation from a straight concentration profile depend on the segregation parameters (segregation energy, energy of mixing). As an illustration results of numerical calculations are presented and discussed.
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Bokstein et al. (1992) studied this question.
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