Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 27: Topical Session: Dislocations in Functional Materials II (joint session MM/FM)
MM 27.3: Vortrag
Mittwoch, 11. März 2026, 16:30–16:45, SCH/A251
Electric Field Effects on Dislocation Motion in SrTiO3 via Mesoscale Indentation — •Alexander Frisch1, Daniel Isaia2, Oliver Preuß2, and Xufei Fang1 — 1Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt, Germany
Dislocations in perovskite oxides have the potential of tuning functional properties of electroceramics, however their behavior and stability under externally applied electric fields remain elusive. Therefore, we investigated the effect of high densities of dislocations onto the dielectric breakdown behavior of SrTiO3, a model perovskite material. Lower dielectric breakdown strengths were found in the high-dislocation-density samples, engineered through the Brinell scratching method. Further, the effect of a 2 kV/mm electric field on the introduction and mobility of dislocations in SrTiO3 was investigated. While no changes to the dislocation plastic zone size, depth, or dislocation distribution were observed, the results suggest the stability of pre-engineered dislocation structures in perovskite oxides under applied electric fields. These results will be interpreted in the context of the dislocation charge state, associated electric field forces, and defect-modified electrical/thermal conductivity.
Keywords: dislocations; perovskite oxides; electric field; indentation; electroplasticity