Anisotropic dislocation-domain wall interactions in ferroelectrics
Date
2022-11-05
Authors
Zhuo, Fangping
Zhou, Xiandong
Gao,Shuang
Höfling, Marion
Dietrich, Felix
Groszewicz, Pedro B.
Fulanović, Lovro
Breckner, Patrick
Wohninsland, Andreas
Xu, Bai-Xiang
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Springer Nature
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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Comments
This article is published as Zhuo, Fangping, Xiandong Zhou, Shuang Gao, Marion Höfling, Felix Dietrich, Pedro B. Groszewicz, Lovro Fulanović et al. "Anisotropic dislocation-domain wall interactions in ferroelectrics." Nature Communications 13, no. 1 (2022): 1-11.
DOI: 10.1038/s41467-022-34304-7.
Copyright 2022 The Author(s).
Attribution 4.0 International (CC BY 4.0).
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