The migration of inclusions in two-component crystals (solid solutions, ionic crystals, and other compounds) is, in many respects, different from their migration in crystals which contain atoms of one kind only. In the case of two-component crystals, an inclusion may migrate under the influence of diffusion fluxes of atoms of both types, and the mobilities of these atoms in an external force field may be different. Therefore, gradients of concentrations of atoms or defects (or an additional inhomogeneous force field) are needed to ensure continuous diffusion fluxes of different kinds of atoms so that the rate of arrival or departure of atoms of different kinds on the surface of a moving dislocation are equal.
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