Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
FM: Fachverband Funktionsmaterialien
FM 12: German-French Focus Session: Materials Research in Polar Oxides – From Domain Engineering to Photonic and Electronic Devices I
FM 12.8: Vortrag
Mittwoch, 11. März 2026, 11:45–12:00, BEY/0138
From Stacking Faults to Field-Stabilized Polarity: Connecting RP Phases and the MFP Phase in SrTiO3 — •Christian Ludt1,2, Hartmut Stöcker1,2, Matthias Zschornak1,2,3, and Dirk C. Meyer1,2 — 1TU Bergakademie Freiberg, 09599 Freiberg, Germany — 2Zentrum für Effiziente Hochtemperatur-Stoffwandlung, 09599 Freiberg, Germany — 3Hochschule für Technik und Wirtschaft Dresden, 01069 Dresden, Germany
Polar functionalities in perovskites often arise from a subtle interplay between lattice distortions, defect chemistry, and stacking faults. In this work, particular attention is given to the migration-induced field-stabilized polar (MFP) phase in SrTiO3, a recently identified polar state that arises from field-driven oxygen mobility and picometer-scale cation displacements. To provide a structural framework for understanding and enhancing this phenomenon, the electronic properties of Ruddlesden-Popper-type (RP) stacking faults in SrO(SrTiO3)n are analyzed using density functional theory. These faults introduce symmetry breaking, modified lattice environments and characteristic changes in the electronic structure that closely resemble the local conditions required to form the MFP phase. By combining insights from RP-layered configurations with the field- and defect-driven mechanisms underlying MFP formation, a unified perspective emerges in which stacking faults act as natural templates that support, amplify, or localize MFP-like polar distortions. This connection highlights new pathways for engineering polar responses and optoelectronic functionalities in complex perovskite oxides.
Keywords: Strontium titanate; Migration-induced field-stabilized polar phase; Ruddlesden-Popper phase