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Formation of mismatched layers in pentagonal nanorods
Author(s) -
Kolesnikova A. L.,
Romanov A. E.
Publication year - 2007
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200701204
Subject(s) - nanorod , shell (structure) , wedge (geometry) , materials science , relaxation (psychology) , radius , core (optical fiber) , critical radius , crystal (programming language) , perfect crystal , lattice (music) , thickening , condensed matter physics , crystallography , chemistry , nanotechnology , composite material , physics , spheres , optics , psychology , social psychology , computer security , bent molecular geometry , astronomy , polymer science , computer science , acoustics , programming language
A new mechanism is presented to model the relaxation phenomena in pentagonal nanorods (PNRs) – elongated multiple twinned crystals. It is demonstrated that a shell possessing crystal mismatch with respect to the PNR core region will reduce the internal energy of the PNR associated with wedge disclinations of strength 7°20′ lying along the PNR axis. We predict the existence of an optimal magnitude for core/shell crystal lattice mismatch and an optimal shell thickness providing maximum energy release for this mechanism of mechanical stress relaxation. The considered relaxation mechanism can be realized by the diffusion of impurities in the shell region without change of the PNR radius or by growth of a thin mismatched shell layer with the corresponding thickening of PNR. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)