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The Core Structure of an Edge Dislocation in NaCl
Author(s) -
Puls M. P.,
So C. B.
Publication year - 1980
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.2220980107
Subject(s) - burgers vector , condensed matter physics , dislocation , core (optical fiber) , symmetry (geometry) , stress (linguistics) , peierls stress , materials science , enhanced data rates for gsm evolution , physics , chemistry , mathematics , geometry , composite material , dislocation creep , telecommunications , linguistics , philosophy , computer science
A theoretical study is carried out to determine the core structure of ( a /2) < 110 > {110} edge dislocations in NaCl and to investigate whether the dislocations dissociate. The calculations show that they do not. This result is opposite to the predictions of Fontaine and Haasen and the conclusions of Belzner and Granzer. The results are generated with the same point‐ion model (PIM) potential employed by Belzner and Granzer, plus a breathing shell model (BSM) potential due to Corish, Parker, and Jacobs. Core properties such as the stable symmetry type, the strain energy, and the Peierls stress are determined. Both potentials produce an approximately sinusoidally shaped Peierls barrier with a periodicity of one Burgers vector. The PIM and BSM potentials yield Peierls stresses of 80 and 17.3 MPa, respectively. Comparison of these results with low‐temperature flow stress data suggests that the BSM result is consistent with the experimental data whereas the PIM result is not.