A study was made of the various structures and types of dislocation which could arise in the {510}  = 13 grain boundaries of diamond cubic materials. Firstly, the possible grain boundary structures were derived within the framework of group theory, and general expressions for the Burgers vectors of the grain boundary dislocations which separated these structures were then obtained. These dislocations were of 3 types. Some were perfect grain boundary dislocations (DSC dislocations), which did not change the grain boundary structure. Others were imperfect grain boundary dislocations, which related different but equivalent grain boundary structures. The remainder were partial dislocations which separated 2 non-equivalent grain boundary structures. Transmission electron microscopy was then used to show that imperfect dislocations were present in a  = 13, 22.6 [001]½ Si grain boundary, and had Burgers vectors which were consistent with ¼[001]½.

L.Sagalowicz, W.A.T.Clark: Philosophical Magazine A, 1995, 72[3], 545-59