Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO 3 –BaTiO 3 ceramics †

YANG, Ziqi, WANG, Bing, BROWN, Thomas, MILNE, Steven J., FETEIRA, Antonio, WOHNINSLAND, Andreas, LALITHA, K. V., LI, Yizhe and HALL, David A. (2023). Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO 3 –BaTiO 3 ceramics †. Journal of Materials Chemistry C.

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BiFeO3–BaTiO3 (BF–BT) solid solutions exhibit great promise as the basis for high temperature piezoelectric transducers and energy storage dielectrics, but the fundamental mechanisms governing their functional properties require further clarification. In the present study, both pure and niobium-doped 0.7BF–0.3BT ceramics are synthesized by solid state reaction and their structure–property relationships are systematically investigated. It is shown that substituting a low concentration of Ti with Nb at a level of 0.5 at% increases the resistivity of BF–BT ceramics and facilitates ferroelectric switching at high electric field levels. Stable planar piezoelectric coupling factor values are achieved with a variation from 0.35 to 0.45 over the temperature range from 100 to 430 °C. In addition to the ferroelectric-paraelectric phase transformation at the Curie point (∼430 °C), a frequency-dependent relaxation of the dielectric permittivity and associated loss peak are observed over the temperature range from −50 to +150 °C. These effects are correlated with anomalous enhancement of the remanent polarization and structural (rhombohedral) distortion with increasing temperature, indicating the occurrence of a re-entrant relaxor ferroelectric transformation on cooling. The results of the study provide new insight into the thermal evolution of structure and the corresponding functional properties in BF–BT and related solid solutions.

Item Type: Article
Additional Information: ** Embargo end date: 24-01-2023 ** From Royal Society of Chemistry via Jisc Publications Router ** Licence for this article starting on 24-01-2023: ** Acknowledgements: Yizhe Li and David Hall acknowledge financial support by the Engineering and Physical Sciences Research Council (Grant number EP/S028978/1). We thank Diamond Light Source for access to beamline I15-1 (proposal number CY24144-1) that contributed to the results presented here. The authors thank Gary Harrison (Department of Materials, University of Manchester) and Annette Kleppe (Diamond Light Source) for assistance with XRD measurements. Andreas Wohninsland thanks the Deutsche Forschungsgemeinschaft (DFG) for financial support under No. KO 5948/1-1 and KL 615/34-1 (Grant No. 414311761). **Journal IDs: pissn 2050-7526; eissn 2050-7534 **Article IDs: publisher-id: d2tc04702k **History: published 24-01-2023; accepted 06-01-2023; submitted 04-11-2022
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SWORD Depositor: Colin Knott
Depositing User: Colin Knott
Date Deposited: 24 Jan 2023 16:56
Last Modified: 11 Oct 2023 17:32

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