It was shown that the distribution of dislocation spacings, in samples with a dislocation density of less than about 2 x 104/cm, was broad; with a single peak and an extended tail. A second peak formed in the distribution as the dislocation density increased to about 1.5 x 105/cm. This peak was initially found at 1.5 times the first modal peak and, as the dislocation density increased further, the second peak increased in magnitude and shifted to 2 times the first modal peak. The second peak occurred when the dislocation density reached about 2.5 x 105/cm. This was attributed to the formation of edge dislocations via the interaction of gliding 60 dislocations.

Development of Misfit Dislocation Distributions in Strained Epitaxial Interfaces. G.MacPherson, R.Beanland, P.J.Goodhew: Scripta Metallurgica et Materialia, 1995, 33[1], 123-8