The energies of  = 11 (233) [0¯11] tilt grain boundary variants were calculated. It was found that the anharmonic bond-charge model yielded different energy rankings of the  = 11A and  = 11B variants in the 2 materials; in agreement with experimental observations.

J.Wilder, H.Teichler: Philosophical Magazine Letters, 1997, 76[2], 83-8