Bright-field and weak-beam transmission electron microscopic investigations were made of plastically deformed SrTiO3. A gradual change from a<110> edge-type to screw-type dislocations was observed with decreasing temperature. It was found that edge dislocations underwent climb at high temperatures. In order to explain this plastic behavior, a model was presented which was based upon the temperature dependence of the dislocation core structures. At high temperatures, edge dislocations dissociated by climb. This was impeded at low temperatures because of the lack of thermal activation. At low temperatures, screw dislocations were assumed to become sessile; due probably to a non-planar dissociation of the dislocation core.

Dislocations in Plastically Deformed SrTiO3. W.Sigle, C.Sarbu, D.Brunner, M.Rühle: Philosophical Magazine, 2006, 86[29-31], 4809-21