The core structures of a 1/6[2¯2▪3] mixed partial dislocation in wurtzite GaN were investigated using a combination of high resolution transmission electron microscopy, circuit mapping, and image simulation of relaxed models. HRTEM simulated images of relaxed atomic models, derived by energetic calculations with a modified Stillinger-Weber-type empirical interatomic potential, were calculated and compared to the experimental images. Among twenty-four stable core configurations the 12- and 10-atom rings satisfied the experimental contrast. A pattern registration procedure was used for the matching of simulated and experimental HRTEM images.

Mixed Partial Dislocation Core Structure in GaN by High Resolution Electron Microscopy. J.Kioseoglou, G.P.Dimitrakopulos, P.Komninou, T.Kehagias, T.Karakostas: Physica Status Solidi A, 2006, 203[9], 2156-60