Anisotropic dislocation-domain wall interactions in ferroelectrics

Fangping Zhuo, Xiandong Zhou, Shuang Gao, Marion Höfling, Felix Dietrich, Pedro B. Groszewicz, Lovro Fulanović, Patrick Breckner, Andreas Wohninsland, Bai-Xiang Xu, Hans-Joachim Kleebe, Xiaoli Tan, Jurij Koruza, Dragan Damjanovic and Jürgen Rödel ()
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Fangping Zhuo: Technical University of Darmstadt
Xiandong Zhou: Technical University of Darmstadt
Shuang Gao: Technical University of Darmstadt
Marion Höfling: Technical University of Denmark
Felix Dietrich: Technical University of Darmstadt
Pedro B. Groszewicz: Delft University of Technology
Lovro Fulanović: Technical University of Darmstadt
Patrick Breckner: Technical University of Darmstadt
Andreas Wohninsland: Technical University of Darmstadt
Bai-Xiang Xu: Technical University of Darmstadt
Hans-Joachim Kleebe: Technical University of Darmstadt
Xiaoli Tan: Iowa State University
Jurij Koruza: Graz University of Technology
Dragan Damjanovic: École Polytechnique Fédérale de Lausanne
Jürgen Rödel: Technical University of Darmstadt

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-34304-7

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