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Research Article | Open Access

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

Xiang NIUa,†, Xiaodong JIANa,c,†( ), Weiping GONGb, Wei LIANGa, Xuetian GONGe, Guangzu ZHANGe, Shenglin JIANGe, Kun YUa, Xiaobo ZHAOa,d, Yingbang YAOa,d, Tao TAOa,d, Bo LIANGa,d, Sheng-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.

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Graphical Abstract

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

lead-free ferroelectricmicrostructurepermittivitypolarizationelectrocaloric effect (ECE)

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Journal of Advanced Ceramics
Volume 11 Issue 11,
November 2022
Pages 1777-1788
DOI: 10.1007/s40145-022-0647-6
Cite this article:
NIU X, JIAN X, GONG W, et al. Field-driven merging of polarizations and enhanced electrocaloric effect in BaTiO3-based lead-free ceramics. Journal of Advanced Ceramics, 2022, 11(11): 1777-1788. https://doi.org/10.1007/s40145-022-0647-6

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Received: 08 May 2022
Revised: 04 August 2022
Accepted: 17 August 2022
Published: 05 November 2022
© The Author(s) 2022.

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