Wang, G., Fan, Z., Murakami, S. et al. (9 more authors) (2019) Origin of the large electrostrain in BiFeO3-BaTiO3 based lead-free ceramics. Journal of Materials Chemistry A, 7 (37). pp. 21254-21263. ISSN 2050-7488
Abstract
High electrostrain and breakdown strength (1 − x)BiFeO3-0.3BaTiO3-xNd(Li0.5Nb0.5)O3 (BF-BT-xNLN) ceramics were studied by in situ synchrotron X-ray diffraction (XRD) in combination with Rietveld refinement and conventional transmission electron microscopy. At zero field, compositions transformed from majority ferroelectric rhombohedral to pseudocubic as the NLN concentration increased, with 0.27% strain achieved at 60 kV cm−1 for x = 0.01. The large measured macroscopic strain was commensurate with peak shifting in XRD peak profiles, yielding 0.6% total strain at 150 kV cm−1. Strain anisotropy of ε200 > ε220 > ε111 was observed but despite the large applied field, no peak splitting was detected. We therefore concluded that the large electrostrain is not achieved through a conventional relaxor to field induced long-range ferroelectric transition. Instead, the data supports a model where local polar regions distort in the direction of the applied field within multiple local symmetries (pseudosymmetry) without long range correlation. We proposed that pseudosymmetry is maintained in BF-BT-xNLN even at high field (150 kV cm−1) due to the large ion radii mismatch and competing ionic/covalent bonding between Ba2+ and Bi3+ ions.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Royal Society of Chemistry. This is an author-produced version of a paper subsequently published in Journal of Materials Chemistry A. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | local polar distortion; synchrotron x-ray diffraction; electro-strain; bismuth ferrite; piezoelectric ceramics |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 06 Sep 2019 08:47 |
Last Modified: | 10 Dec 2021 14:12 |
Status: | Published |
Publisher: | Royal Society of Chemistry (RSC) |
Refereed: | Yes |
Identification Number: | 10.1039/c9ta07904a |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:150547 |