Temperature Dependent Piezoelectric Properties of Lead-Free (1- x )K 0.6 Na 0.4 NbO 3 – x BiFeO 3 Ceramics

KHESRO, Amir, WANG, Dawei, HUSSAIN, Fayaz, MUHAMMAD, Raz, WANG, Ge, FETEIRA, Antonio and REANEY, Ian M. (2020). Temperature Dependent Piezoelectric Properties of Lead-Free (1- x )K 0.6 Na 0.4 NbO 3 – x BiFeO 3 Ceramics. Frontiers in Materials, 7, p. 140.

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Link to published version:: https://doi.org/10.3389/fmats.2020.00140


(1-x)K0.4Na0.6NbO3–xBiFeO3 lead-free piezoelectric ceramics were successfully prepared in a single perovskite phase using the conventional solid-state synthesis. Relative permittivity (εr) as a function of temperature indicated that small additions of BiFeO3 not only broadened and lowered the cubic to tetragonal phase transition (TC) but also shifted the tetragonal to orthorhombic phase transition (TO–T) toward room temperature (RT). Ceramics with x = 1 mol.% showed optimum properties with small and large signal piezoelectric coefficient, d33 = 182 pC/N and d∗33 = 250 pm/V, respectively, electromechanical coupling coefficient, kp = 50%, and TC = 355°C. kp varied by ∼5% from RT to 90°C, while d∗33 showed a variation of ∼15% from RT to 75°C, indicating that piezoelectric properties were stable with temperature in the orthorhombic phase field. However, above the onset of TO–T, the properties monotonically degraded in the tetragonal phase field as TC was approached.

Item Type: Article
Additional Information: ** From Frontiers via Jisc Publications Router ** Licence for this article: http://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 2296-8016 **History: published_online 19-05-2020; accepted 23-04-2020; submitted 10-02-2020; collection 2020
Uncontrolled Keywords: Materials, piezoelectrics, lead free, K0.5Na0.5NbO3, temperature dependence, BiFeO3
Identification Number: https://doi.org/10.3389/fmats.2020.00140
Page Range: p. 140
SWORD Depositor: Colin Knott
Depositing User: Colin Knott
Date Deposited: 02 Jun 2020 08:55
Last Modified: 18 Mar 2021 01:34
URI: https://shura.shu.ac.uk/id/eprint/26395

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