Misfit dislocation loops in composite core-shell nanoparticles

  • Gutkin M
  • Kolesnikova A
  • Krasnitsky S
 et al. 
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Abstract

The critical conditions have been calculated for the generation of circular prismatic loops of misfit dislocations at the interfaces in spherically symmetric composite core-shell nanoparticles. It has been shown that the formation of these loops becomes energetically favorable if the misfit parameter exceeds a critical value, which is determined by the geometry of the system. The most preferred position of the dislocation loop is in the equatorial plane of the nanoparticle. For a given radius of the nanoparticle, there is a minimum value of the critical misfit parameter below which the generation of a misfit dislocation is energetically unfavorable for any ratio of the core and shell radii. For a misfit parameter exceeding the minimum critical value, there are two critical values of the reduced radius of the particle core in the interval between which the generation of a dislocation loop is energetically favorable. This interval increases with increasing misfit parameter for a fixed particle size and decreases with decreasing particle size for a fixed misfit parameter. © 2014 Pleiades Publishing, Ltd.

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Authors

  • M.Y. Gutkin

  • A.L. Kolesnikova

  • S.A. Krasnitsky

  • A.E. Romanov

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