Thermodynamics of ‘glide’ and ‘shuffle’ dislocations in the diamond lattice

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Abstract
It is shown that, in a thermodynamic sense, there exist both vacancy and interstitial type shuffle perfect dislocations in the diamond (and zincblende) lattice. Point-defect-dislocation equilibria may well be important in understanding the morphology of misfit dislocations in semiconductor epitaxy as well as in problems of deformation. Two different intuitively plausible estimates (one based on counting broken bonds at dislocation cores, the other on model building) yield diametrically opposed ordering of the relative stability of subtypes of perfect dislocations. There does not appear to be any current microscopic technique capable of verifying whether a dislocation with given Burgers vector is of one subtype or another. A brief sketch is given of the problems with which a full calculation will have to deal.

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