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Title: Twin-boundary-mediated flexoelectricity in LaAlO3

Abstract

Flexoelectricity has garnered much attention owing to its ability to bring electromechanical functionality to nonpiezoelectric materials and its nanoscale significance. In order to move towards a more complete understanding of this phenomenon and improve the efficacy of flexoelectric-based devices, it is necessary to quantify microstructural contributions to flexoelectricity. Here we directly measure the flexoelectric response of bulk centrosymmetric LaAlO3 crystals with different twin-boundary microstructures. We show that twin-boundary flexoelectric contributions are comparable to intrinsic contributions at room temperature and enhance the flexoelectric response by ~4× at elevated temperatures. Additionally, we observe time-dependent and nonlinear flexoelectric responses associated with strain-gradient-induced twin-boundary polarization. Finally, these results are explained by considering the interplay between twin-boundary orientation, beam-bending strain fields, and pinning site interactions, and directly demonstrate that macroscopic flexoelectric responses are very sensitive to structural defects.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
+ Show Author Affiliations
  1. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1849395
Grant/Contract Number:  
FG02-01ER45945
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; materials science; domains; ferroelasticity; flexoelectricity; twinning; complex oxides

Citation Formats

Mizzi, Christopher A., Guo, Binghao, and Marks, Laurence D. Twin-boundary-mediated flexoelectricity in LaAlO3. United States: N. p., 2021. Web. doi:10.1103/physrevmaterials.5.064406.
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Mizzi, Christopher A., Guo, Binghao, & Marks, Laurence D. Twin-boundary-mediated flexoelectricity in LaAlO3. United States. https://doi.org/10.1103/physrevmaterials.5.064406
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Mizzi, Christopher A., Guo, Binghao, and Marks, Laurence D. Mon . "Twin-boundary-mediated flexoelectricity in LaAlO3". United States. https://doi.org/10.1103/physrevmaterials.5.064406. https://www.osti.gov/servlets/purl/1849395.
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@article{osti_1849395,
title = {Twin-boundary-mediated flexoelectricity in LaAlO3},
author = {Mizzi, Christopher A. and Guo, Binghao and Marks, Laurence D.},
abstractNote = {Flexoelectricity has garnered much attention owing to its ability to bring electromechanical functionality to nonpiezoelectric materials and its nanoscale significance. In order to move towards a more complete understanding of this phenomenon and improve the efficacy of flexoelectric-based devices, it is necessary to quantify microstructural contributions to flexoelectricity. Here we directly measure the flexoelectric response of bulk centrosymmetric LaAlO3 crystals with different twin-boundary microstructures. We show that twin-boundary flexoelectric contributions are comparable to intrinsic contributions at room temperature and enhance the flexoelectric response by ~4× at elevated temperatures. Additionally, we observe time-dependent and nonlinear flexoelectric responses associated with strain-gradient-induced twin-boundary polarization. Finally, these results are explained by considering the interplay between twin-boundary orientation, beam-bending strain fields, and pinning site interactions, and directly demonstrate that macroscopic flexoelectric responses are very sensitive to structural defects.},
doi = {10.1103/physrevmaterials.5.064406},
journal = {Physical Review Materials},
number = 6,
volume = 5,
place = {United States},
year = {Mon Jun 14 00:00:00 EDT 2021},
month = {Mon Jun 14 00:00:00 EDT 2021}
}
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https://doi.org/10.1103/physrevmaterials.5.064406
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