Subsurface diffusion in crystals and effect of surface permeability on the atomic step motion

Sergey Kosolobov

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    A new theoretical approach to characterize the diffusion of both surface and bulk point defects in crystals is presented. In our model, atomic steps are considered as sources and sinks not only for adatoms and advacancies but also for self-interstitials and bulk vacancies, providing a new mechanism for bulk point defect generation and annihilation. It is shown that the creation and annihilation of self-interstitials and vacancies occur at atomic steps and can be described by introducing a diffusive layer of the bulk point defects adsorbed just below the surface. The atomic step rate of advance is studied taking into account finite permeability of the surface for bulk and surface point defects. The surface permeability results in the appearance of the dependence of the total step rate of advance not only on the supersaturation in vapor phase but also on the supersaturation of point defects in the bulk.

    Original languageEnglish
    Article number13428
    JournalScientific Reports
    Volume9
    Issue number1
    DOIs
    Publication statusPublished - 1 Dec 2019

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