A high-resolution transmission electron microscopic study was made of dislocations, with a Burgers vector of <101>, in nano-sized crystallites. It was found that they existed either as ordinary dislocations or as extended dislocations. The extended dislocations were composed of a crystallographic shear plane and 2 partial dislocations with a Burgers vector of <½0½>. There were 2 types of relationship between the orientation, (hkl), and the displacement vector, [uvw], of the (hkl)[uvw] crystallographic shear plane. In one case, a (hkl)||[uvw] condition obtained. In the other case, (hkl) was not parallel to [uvw]. The crystallographic shear plane was oriented parallel to {101}, and [uvw] was <½0½>. Face-sharing SnO6 octahedra existed at the cores of extended dislocations. The local composition at dislocation cores varied with dislocation type, and was different to the stoichiometric composition of SnO2.

J.G.Zheng, X.Pan, M.Schweizer, U.Weimar, W.Göpel, M.Rühle: Philosophical Magazine Letters, 1996, 73[3], 93-100