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Split and sealing of dislocated pipes at the front of a growing crystal
Author(s) -
Gutkin M. Yu.,
Sheinerman A. G.
Publication year - 2004
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.200302019
Subject(s) - dislocation , crystal (programming language) , loop (graph theory) , perpendicular , materials science , front (military) , stress field , stress (linguistics) , mechanics , composite material , crystallography , geometry , physics , chemistry , thermodynamics , mechanical engineering , engineering , mathematics , finite element method , linguistics , philosophy , combinatorics , computer science , programming language
A model is suggested for the split of dislocated pipes at the front a growing crystal. Within the model, the pipe split occurs through the generation of a dislocation semi‐loop at the pipe and crystal surfaces and its subsequent expansion into the crystal interior. The strain energy of such a dislocation semi‐loop as well as the stress field of a dislocated pipe perpendicular to a flat crystal surface are calculated. The parameter regions are determined at which the expansion of the dislocation semi‐loop is energetically favorable and, thus, the pipe split becomes irreversible. A mechanism is proposed for the formation of a stable semi‐loop resulting in the split and possible subsequent overgrowth of the dislocated pipe. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)