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. High-resolution transmission electron microscopic 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