It was shown, using an atomistic model or a Stillinger-Weber potential, that (in the absence of reconstruction) the basic assumption of the Peierls-Nabarro model (that the dislocation core was spread out within the glide plane) was true for Si. The Peierls stress which was deduced from the models was in quantitative agreement when restoring forces which were obtained from first-principles generalized stacking-fault energy surfaces were used in the Peierls-Nabarro model. The Peierls stress was found to be isotropic in the glide plane. In the case of the Stillinger-Weber potential model, no evidence was found for dissociation in the shuffle dislocations. However, the glide sets separated into 2 partials.

Q.Ren, B.Joós, M.S.Duesbery: Physical Review B, 1995, 52[18], 13223-8