This article is cited in 31 papers

Mechanical properties, strength physics and plasticity

Misfit dislocation loops in composite core-shell nanoparticles

M. Yu. Gutkin^abc, A. L. Kolesnikova^b, S. A. Krasnitckii^c, A. E. Romanov<sup>ade

a</sup> St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^b Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg
^c Peter the Great St. Petersburg Polytechnic University
^d Ioffe Institute, St. Petersburg
^e Togliatti State University

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.

Received: 14.10.2013

 English version: Physics of the Solid State, 2014, 56:4, 723–730

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