Abstract The structure of dislocation in a two-dimensional triangular crystal has been studied theoretically on the basis of atomic interaction and lattice statics. The theory presented in this paper is an improvement to that published previously. Within a reasonable interaction approximation, a new dislocation equation is obtained, which remedies a fault existing in the lattice theory of dislocation. A better simplification of non-diagonal terms of the kernel is given. The solution of the new dislocation equation asymptotically becomes the same as that obtained in the elastic theory, and agrees with experimental data. It is found that the solution is formally identical with that proposed phenomenologically by Foreman et al, where the parameter can be chosen freely, but cannot uniquely determined from theory. Indeed, if the parameter in the expression of the solution is selected suitably, the expression can be well applied to describe the fine structure of the dislocation.
Received: 21 June 2004
Revised: 08 December 2004
Accepted manuscript online:
PACS:
61.72.Bb
(Theories and models of crystal defects)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10274057)
Cite this article:
Wang Shao-Feng (王少峰) An improvement of the lattice theory of dislocation for a two-dimensional triangular crystal 2005 Chinese Physics 14 791
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