On the theory of diffusional shrinkage of a pore in real crystals

Driving forces and diffusional mechanisms of a pore shrinkage in a crystal, containing other sources (sinks) of vacancies are considered. The finite length of a diffusional path of an excess vacancy in the bulk of a crystal and the difference in the atomic chemical potential on a plain surface and that on the considered sources in the bulk of a crystal are taken into account as is the finite rate of a formation of vacancies on the surface of a pore. An expression describing the duration of the shrinkage of a spherical pore is obtained. This interval is essentially (by 30 times and more) smaller than that for a pore in an ideal crystal.