Murakami, S., Wang, D., Mostaed, A. orcid.org/0000-0002-2443-7819 et al. (6 more authors) (2018) High strain (0.4%) Bi(Mg2/3Nb1/3)O3‐BaTiO3‐BiFeO3 lead‐free piezoelectric ceramics and multilayers. Journal of the American Ceramic Society, 101 (12). pp. 5428-5442. ISSN 0002-7820
Abstract
The relationship between the piezoelectric properties and the structure/microstructure for 0.05Bi(Mg2/3Nb1/3)O3-(0.95-x)BaTiO3-xBiFeO3(BBFT, x = 0.55, 0.60, 0.63, 0.65, 0.70, and 0.75) ceramics has been investigated. Scanning electron microscopy revealed a homogeneous microstructure for x < 0.75 but there was evidence of a core-shell cation distribution for x = 0.75 which could be suppressed in part through quenching from the sintering temperature. X-ray diffraction (XRD) suggested a gradual structural transition from pseudocubic to rhombohedral for 0.63 < x < 0.70, characterized by the coexistence of phases. The temperature dependence of relative permittivity, polarization-electric field hysteresis loops, bipolar strain-electric field curves revealed that BBFT transformed from relaxor-like to ferroelectric behavior with an increase in x, consistent with changes in the phase assemblage and domain structure. The largest strain was 0.41% for x = 0.63 at 10 kV/mm. The largest effective piezoelectric coefficient (d33*) was 544 pm/V for x = 0.63 at 5 kV/mm but the largest Berlincourt d33(148 pC/N) was obtained for x = 0.70. We propose that d33*is optimized at the point of crossover from relaxor to ferroelectric which facilitates a macroscopic field induced transition to a ferroelectric state but that d33is optimized in the ferroelectric, rhombohedral phase. Unipolar strain was measured as a function of temperature for x = 0.63 with strains of 0.30% achieved at 175°C, accompanied by a significant decrease in hysteresis with respect to room temperature measurements. The potential for BBFT compositions to be used as high strain actuators is demonstrated by the fabrication of a prototype multilayer which achieved 3 μm displacement at 150°C.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The American Ceramic Society. This is an author produced version of a paper subsequently published in Journal of the American Ceramic Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Ferroelectricity/ferroelectric materials; lead-free ceramics; multilayers; piezoelectric materials/properties; relaxors |
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: | 19 Oct 2018 13:08 |
Last Modified: | 07 May 2019 00:40 |
Published Version: | https://doi.org/10.1111/jace.15749 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1111/jace.15749 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:137393 |