Abstract

Burgers vectors of the axial dislocations for <001∗> growth were definitely determined by transmission electron microscopy to be ± 1 2 ;a[110] or ± 1 2 ;a[1 10] , both of which were perpendicular to the growth axis. The elastic dislocation energy stored in the crystal during the growth was calculated to determine the preferred direction of dislocation propagation. The results showed that dislocations having Burgers vectors perpendicular to the growth axis were stable axial dislocations. This is in good agreement with the experimental results. The generation mechanism and a method for avoiding dislocation propagation are discussed.

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