Anisotropic dislocation-domain wall interactions in ferroelectrics.

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ID: 276115
2022
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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). 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.
Reference Key
zhuo2022anisotropicnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhuo, Fangping;Zhou, Xiandong;Gao, Shuang;Höfling, Marion;Dietrich, Felix;Groszewicz, Pedro B;Fulanović, Lovro;Breckner, Patrick;Wohninsland, Andreas;Xu, Bai-Xiang;Kleebe, Hans-Joachim;Tan, Xiaoli;Koruza, Jurij;Damjanovic, Dragan;Rödel, Jürgen;
Journal Nature communications
Year 2022
DOI
6676
URL
Keywords
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