Zhuo, Fangping ; Zhou, Xiandong ; Gao, Shuang ; Höfling, Marion ; Dietrich, Felix ; Groszewicz, Pedro B. ; Fulanovic, Lovro ; Breckner, Patrick ; Wohninsland, Andreas ; Xu, Bai-Xiang ; Kleebe, Hans-Joachim ; Tan, Xiaoli ; Koruza, Jurij ; Damjanovic, Dragan ; Rödel, Jürgen (2022)
Anisotropic dislocation-domain wall interactions in ferroelectrics.
In: Nature communications, 13
doi: 10.1038/s41467-022-34304-7
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Dislocations are usually expected to degrade electrical, thermal and optical functionality and to tune mechanical properties of materials. Here, we demonstrate a general framework for the control of dislocation–domain wall interactions in ferroics, employing an imprinted dislocation network. Anisotropic dielectric and electromechanical properties are engineered in barium titanate crystals via well-controlled line-plane relationships, culminating in extraordinary and stable large-signal dielectric permittivity (≈23100) and piezoelectric coefficient (≈2470 pm V–1). In contrast, a related increase in properties utilizing point-plane relation prompts a dramatic cyclic degradation. Observed dielectric and piezoelectric properties are rationalized using transmission electron microscopy and time- and cycle-dependent nuclear magnetic resonance paired with X-ray diffraction. Succinct mechanistic understanding is provided by phase-field simulations and driving force calculations of the described dislocation–domain wall interactions. Our 1D-2D defect approach offers a fertile ground for tailoring functionality in a wide range of functional material systems.

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