Hierarchically-structured large superelastic deformation in ferroelastic-ferroelectrics

Large superelastic deformation in ferroelastic-ferroelectrics (FMs) is a complex phenomenon involving multiple mechanisms operating simultaneously. Understanding how these mechanisms contribute corporately is critical to apply this useful property to the intrinsically brittle FMs, which can therefor...

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Bibliographic Details
Published in:Acta materialia 2019-12, Vol.181 (C), p.501-509
Main Authors: Deng, Yu, Gammer, Christoph, Ciston, Jim, Ercius, Peter, Ophus, Colin, Bustillo, Karen, Song, Chengyu, Zhang, Ruopeng, Wu, Di, Du, Youwei, Chen, Zhiqiang, Dong, Hongliang, Khachaturyan, Armen G., Minor, Andrew M.
Format: Article
Language:English
Subjects:
4D-STEM
Ferroelastic-ferroelectrics
Hierarchical structure
In situ transmission electron microscope
Superelastic deformation
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Summary:Large superelastic deformation in ferroelastic-ferroelectrics (FMs) is a complex phenomenon involving multiple mechanisms operating simultaneously. Understanding how these mechanisms contribute corporately is critical to apply this useful property to the intrinsically brittle FMs, which can therefore display both excellent functional and mechanical performance. Here, we have directly observed and quantitatively analyzed in situ in a transmission electron microscope the three main mechanisms of twinning domain, phase transformation and mobile point defect contributing to extremely large superelastic deformation in single-crystal BaTiO3 (5.0% strain) and Pb(Mg1/3Nb2/3)O3-PbTiO3 (10.1% strain). Our results reveal the hierarchical origin of large recoverable strain in “brittle” FMs. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2019.10.018