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Concentration–elastic instabilities in a solid half‐space
Author(s) -
Mirzade F. Kh.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945186
Subject(s) - instability , condensed matter physics , elastic energy , concentric , space (punctuation) , grating , elastic instability , materials science , physics , mechanics , molecular physics , classical mechanics , optics , thermodynamics , geometry , mathematics , linguistics , philosophy
The generation of periodic structures due to concentration–elastic instability that appears in an ensemble of laser‐induced atomic point defects on the surface of a solid is studied. The dynamical model developed here is based on coupled evolution equations for the elastic and atomic defect density fields. The idea of an instability model is related to a reduction in the activation (formation and migration) energy of atomic defects under the influence of elastic fields. It is shown that the development of this instability creates various ordered surface structures of coupled strain and defect‐concentration fields (one‐ and two‐dimensional lattices, concentric rings, radial and radial‐ray structures). Dispersion relationships are derived for the growth increment of these structures and their characteristic scales (grating period, number of rays in a structure) are obtained. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)