Dresden 2026 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 27: Topical Session: Dislocations in Functional Materials II (joint session MM/FM)

MM 27.1: Topical Talk

Wednesday, March 11, 2026, 15:45–16:15, SCH/A251

Dislocations in perovskite oxides: similarities and differences — •Pierre Hirel — Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France

The experimental discovery of room-temperature ductility in strontium titanate SrTiO₃ in 2001, has revealed the surprising mobility of dislocations in ⟨110⟩ {110} slip systems. Atomic-scale simulations have contributed to resolving the core structure of these dislocations, and their role in the ductile-brittle transition. Since then, similar ductile behaviour was found in related perovskite oxides KNbO₃ and KTaO₃. However, other perovskites like BaTiO₃ or CaSiO₃ remain essentially brittle at room temperature, despite having the same crystal lattice and similar chemical compositions as ductile perovskites.

Keywords: perovskite; plasticity; dislocation; modelling