A study was made of the atomic structure of {112} S = 3 twin boundaries which consisted of a stacking of six {111} planes and were characterized by having a resultant Burgers vector which was equal to zero. The twins were imaged by means of high-resolution transmission electron microscopy. Image processing was used to localize the Si and C atoms in each grain, deduce their stacking and calculate the possible rotation and translation of one grain with respect to the other with an accuracy that was greater than 0.1%. It was shown that there was no rigid-body translation between the 2 grains. However, Moller and Pond type models were not suitable. An alternative model was proposed which was in close agreement with the asymmetrical contrast of the twin boundary.

Atomic Structure of {112} Σ = 3 Twin Boundary in β-SiC. C.Ragaru, M.Lancin, C.Godon: European Physics Journal, 1999, 5[2], 135-41