ELECTRON-MICROSCOPY OF DISLOCATION-STRUCTURES IN SRTIO3 DEFORMED AT HIGH-TEMPERATURES

Dislocations in SrTiO3 deformed plastically by indentation at 900 and 1100-degrees-C are studied by comprehensive transmission electron microscopy. At both 900 and 1100-degrees-C all the dislocations studied have Burgers vectors of either <100> or <110> type. At 900-degrees-C both types of dislocation are in the glide configuration. On the other hand, at 1100-degrees-C <001> dislocations are in the climb configuration, although most of <110> dislocations are in the glide configuration. Small dislocation loops, both of <100> and <110> types, are observed, and most of them are identified as vacancy type.