Obilor, U., Pascual-Gonzalez, C., Murakami, S. et al. (2 more authors) (2018) Study of the temperature dependence of the giant electric field-induced strain in Nb-doped BNT-BT-BKT piezoceramics. Materials Research Bulletin, 97. pp. 385-392. ISSN 0025-5408
Abstract
Dense Bi 0.487 Na 0.427 K 0.06 Ba 0.026 TiO 3 (BNKBT) and Nb-doped Bi 0.487 Na 0.427 K 0.06 Ba 0.026 Ti 0.98 Nb 0.02 O 3 (Nb-BNKBT) ceramics were prepared by the solid state reaction route. BNKBT is a non-ergodic relaxor and exhibits a piezoelectric response typical for a ferroelectric, whereas Nb-BNKBT is an ergodic relaxor and exhibits an electromechanical response typical for an incipient ferroelectric. The incorporation of 2 mol% of Nb into the BNKBT lattice is accompanied by an enhancement of the room-temperature unipolar field-induced strain from 0.19% to 0.43% at 75 kV/cm. BNKBT shows a depolarisation temperature of ∼90 °C, above which an electrostrictive response is observed, whereas Nb-BNKBT shows an electrostrictive response in the entire temperature range studied. At 40 kV/cm, Nb-BNKBT exhibits a temperature stable electromechanical response in comparison with undoped BNKBT, but it worsens under higher electric fields. These results may motivate further investigations on the impact of minor doping and driving electric fields on the electromechanical response of Bi 0.5 Na 0.5 TiO 3 –Bi 0.5 K 0.5 TiO 3 –BaTiO 3 -based ceramics.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). |
Keywords: | Giant strain; Pb-free piezoelectrics; Ergodic; Non-ergodic; Temperature stable |
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: | 12 Oct 2017 09:50 |
Last Modified: | 10 Nov 2023 12:25 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.materresbull.2017.09.032 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:121988 |