Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-021-23107-x
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dc.titleAlkali-deficiency driven charged out-of-phase boundaries for giant electromechanical response
dc.contributor.authorWu, Haijun
dc.contributor.authorNing, Shoucong
dc.contributor.authorWaqar, Moaz
dc.contributor.authorLiu, Huajun
dc.contributor.authorZhang, Yang
dc.contributor.authorWu, Hong-Hui
dc.contributor.authorLi, Ning
dc.contributor.authorWu, Yuan
dc.contributor.authorYao, Kui
dc.contributor.authorLookman, Turab
dc.contributor.authorDing, Xiangdong
dc.contributor.authorSun, Jun
dc.contributor.authorWang, John
dc.contributor.authorPennycook, Stephen J.
dc.date.accessioned2022-10-11T07:48:22Z
dc.date.available2022-10-11T07:48:22Z
dc.date.issued2021-05-14
dc.identifier.citationWu, Haijun, Ning, Shoucong, Waqar, Moaz, Liu, Huajun, Zhang, Yang, Wu, Hong-Hui, Li, Ning, Wu, Yuan, Yao, Kui, Lookman, Turab, Ding, Xiangdong, Sun, Jun, Wang, John, Pennycook, Stephen J. (2021-05-14). Alkali-deficiency driven charged out-of-phase boundaries for giant electromechanical response. Nature Communications 12 (1) : 2841. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-021-23107-x
dc.identifier.issn2041-1723
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/231946
dc.description.abstractTraditional strategies for improving piezoelectric properties have focused on phase boundary engineering through complex chemical alloying and phase control. Although they have been successfully employed in bulk materials, they have not been effective in thin films due to the severe deterioration in epitaxy, which is critical to film properties. Contending with the opposing effects of alloying and epitaxy in thin films has been a long-standing issue. Herein we demonstrate a new strategy in alkali niobate epitaxial films, utilizing alkali vacancies without alloying to form nanopillars enclosed with out-of-phase boundaries that can give rise to a giant electromechanical response. Both atomically resolved polarization mapping and phase field simulations show that the boundaries are strained and charged, manifesting as head-head and tail-tail polarization bound charges. Such charged boundaries produce a giant local depolarization field, which facilitates a steady polarization rotation between the matrix and nanopillars. The local elastic strain and charge manipulation at out-of-phase boundaries, demonstrated here, can be used as an effective pathway to obtain large electromechanical response with good temperature stability in similar perovskite oxides. © 2021, The Author(s).
dc.publisherNature Research
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScopus OA2021
dc.typeArticle
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.contributor.departmentDEPT OF MATERIALS SCIENCE & ENGINEERING
dc.description.doi10.1038/s41467-021-23107-x
dc.description.sourcetitleNature Communications
dc.description.volume12
dc.description.issue1
dc.description.page2841
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