Circular loops of misfit dislocations in decahedral core-shell nanoparticles

被引：13

作者：

Krauchanka, M. Yu. ^{[1
]}

Krasnitckii, S. A. ^{[1
,2
]}

Gutkin, M. Yu. ^{[1
,2
,3
]}

Kolesnikova, A. L. ^{[1
,2
]}

Romanov, A. E. ^{[1
]}

机构：

[1] ITMO Univ, Kronverkskiy Pr 49, St Petersburg 197101, Russia

[2] Russian Acad Sci, Inst Problems Mech Engn, Bolshoj 61, St Petersburg 199178, Russia

[3] Peter Great St Petersburg Polytech Univ, Dept Mech & Control Proc, Polytekhnicheskaya 29, St Petersburg 195251, Russia

来源：

SCRIPTA MATERIALIA | 2019年 / 167卷

基金：

俄罗斯基础研究基金会;

关键词：

Decahedral core-shell nanoparticles; Disclinations; Dislocations; Interface defects; Stress relaxation; ICOSAHEDRAL SMALL PARTICLES; STRESS-RELAXATION; BIMETALLIC NANOPARTICLES; PENTAGONAL NANORODS; MISMATCHED LAYERS; ELASTIC STRESSES; QUANTUM DOTS; GENERATION; DISCLINATIONS; CHANNELS;

D O I：

10.1016/j.scriptamat.2019.03.031

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A theoretical model is proposed for stress relaxation in decahedral core-shell nanoparticles through formation of circular prismatic misfit dislocation loops at the core-shell interface. The critical conditions for stress relaxation are determined and discussed in comparison with those for single-crystalline core-shell nanoparticles. It is shown that decahedral core-shell nanoparticles should be less stable with respect to misfit dislocation generation than single-crystalline ones when the lattice parameter of the core is larger than that of the shell. Theoretical results are compared with experimental observations available in the literature and are shown to be in a good agreement with the latter. (C) 2019 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页码：81 / 85

页数：5

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