Deformation behaviour of strontium titanate between room temperature and 1800 K under ambient pressure

SrTiO3 was plastically deformed in compression along different crystal axes between room temperature and 1800 K. Data obtained from deformation experiments as well as from light optical and electron optical studies are presented. Irrespective of the compression axis orientation, the material exhibits a strongly pronounced ductile-to-brittle-to-ductile behaviour. For the <100> compression axis the slip system <110> {110} is active both at low and high temperatures. For compression axes other than <100> the <110>{110} system is active only at low temperatures whereas at high temperatures the <100>{110} system dominates. This behaviour is discussed in terms of dislocation core structures.