The energy of two coincidence grain boundaries was investigated with the Stillinger-Weber potential after modification for GaN. Two interfaces with different periods corresponding to the edge and diagonal of the unit cell of two coincidence site lattices were analyzed. It was shown that their energy depends mainly on the atomic structure of the dislocation cores composing the period.

Atomic Structure and Energy of Grain Boundaries in GaN. J.Chen, P.Ruterana, G.Nouet: Physica Status Solidi C, 2003, 0[7], 2436-9