Origin of the large electrostrain in BiFeO>3-BaTiO3 based lead-free ceramics

WANG, G, FAN, Z, MURAKAMI, S, LU, Z, HALL, DA, SINCLAIR, DC, FETEIRA, Antonio, TAN, X, JONES, JL, KLEPPE, AK, WANG, D and REANEY, IM (2019). Origin of the large electrostrain in BiFeO>3-BaTiO3 based lead-free ceramics. Journal of Materials Chemistry A, 7 (37), 21254-21263.

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Official URL: https://pubs.rsc.org/en/content/articlelanding/201...
Link to published version:: https://doi.org/10.1039/c9ta07904a
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    Abstract

    © 2019 The Royal Society of Chemistry. 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.

    Item Type: Article
    Identification Number: https://doi.org/10.1039/c9ta07904a
    Page Range: 21254-21263
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 11 Oct 2019 09:14
    Last Modified: 26 Aug 2020 01:18
    URI: http://shura.shu.ac.uk/id/eprint/25264

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