The structure of a [00•1] 31.5° tilt boundary was investigated by means of high-resolution electron microscopy. In some regions, the interface structure could be best described by referring to the periodic dichromatic pattern that corresponded to the misorientation, [00•1] 32.5˚ (Σ = 13). These regions exhibited arrangements of periodic facets, with localized interfacial dislocations (with primitive Burgers vectors) superposed on them. Other regions were better described by referring to the dichromatic pattern which corresponded to [00•1] 30°, which was periodic parallel to [00•1] alone. These segments of interface were parallel to (0¯1•0) and (11•0) in the adjacent crystals, and their structure was incommensurate perpendicular to [00•1]. No localized defects were found in such segments.

F.Sarrazit, R.C.Pond, N.A.Kiselev: Philosophical Magazine Letters, 1998, 77[4], 191-8