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Solid-state cooling technology based on electrocaloric effect (ECE) has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming gases. However, the development in high ECE materials is still a challenge. In this work, polarization merging strategy was proposed to achieve a large ECE in xBa(Sn0.07Ti0.93)O3–(1−x)Ba(Hf0.1Ti0.9)O3 ferroelectric ceramics, where x = 0, 0.2, 0.4, 0.6, 0.8, and 1. Ba(Sn0.07Ti0.93)O3 with an orthorhombic phase and Ba(Hf0.1Ti0.9)O3 with a rhombohedral phase at room temperature were prepared beforehand as precursors, and phase-coexisted xBSnT–(1−x)BHfT ceramics were formed via a solid-state reaction approach. Phase coexisting structures were confirmed using the X-ray diffraction. The merged polarization was confirmed by the dielectric and ferroelectric properties. Optimal ECEs were obtained for 0.2BSnT–0.8BHfT ceramics, i.e., adiabatic temperature change ΔT = 2.16±0.08 K at 80 ℃ and 5 MV/m, and ΔT = 3.35±0.09 K at 80 ℃ and 7 MV/m.


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Field-driven merging of polarizations and enhanced electrocaloric effect in BaTiO3-based lead-free ceramics

Show Author's information Xiang NIUa,Xiaodong JIANa,c,( )Weiping GONGbWei LIANGaXuetian GONGeGuangzu ZHANGeShenglin JIANGeKun YUaXiaobo ZHAOa,dYingbang YAOa,dTao TAOa,dBo LIANGa,dSheng-Guo LUa,d( )
Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516007, China
Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, The 5th Electronics Research Institute of the Ministry of Industry and Information Technology, Guangzhou 510610, China
Dongguan South China Design Innovation Institute, Dongguan 523808, China
School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

† Xiang Niu and Xiaodong Jian contributed equally to this work.

Abstract

Solid-state cooling technology based on electrocaloric effect (ECE) has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming gases. However, the development in high ECE materials is still a challenge. In this work, polarization merging strategy was proposed to achieve a large ECE in xBa(Sn0.07Ti0.93)O3–(1−x)Ba(Hf0.1Ti0.9)O3 ferroelectric ceramics, where x = 0, 0.2, 0.4, 0.6, 0.8, and 1. Ba(Sn0.07Ti0.93)O3 with an orthorhombic phase and Ba(Hf0.1Ti0.9)O3 with a rhombohedral phase at room temperature were prepared beforehand as precursors, and phase-coexisted xBSnT–(1−x)BHfT ceramics were formed via a solid-state reaction approach. Phase coexisting structures were confirmed using the X-ray diffraction. The merged polarization was confirmed by the dielectric and ferroelectric properties. Optimal ECEs were obtained for 0.2BSnT–0.8BHfT ceramics, i.e., adiabatic temperature change ΔT = 2.16±0.08 K at 80 ℃ and 5 MV/m, and ΔT = 3.35±0.09 K at 80 ℃ and 7 MV/m.

Keywords: microstructure, polarization, permittivity, lead-free ferroelectric, electrocaloric effect (ECE)

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Received: 08 May 2022
Revised: 04 August 2022
Accepted: 17 August 2022
Published: 05 November 2022
Issue date: November 2022

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© The Author(s) 2022.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51872053, 52272105, and 52202130), the Guangdong Provincial Natural Science Foundation (Grant No. 2015A030308004), the NSFC–Guangdong Joint Fund (Grant No. U1501246), the Dongguan City Frontier Research Project (Grant No. 2019622101006), the Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch–Foshan Xianhu Laboratory Open Fund-Key Project (Grant No. XHT2020-011), and the Open Project Program of Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University (Grant No. EFMD2022004Z).

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