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Research Article | Open Access

Simultaneous achievement of large electrocaloric effect and ultra-wide operating temperature range in BaTiO3-based lead-free ceramic

Zhaojie Wang1Yingzhi Meng1Silin Tang2Xiang Niu3Hongfang Zhang4( )Dingyuan Wang5Yisong Bai5Biaolin Peng6Xue Chen7Qingqing Ke2( )Sheng-Guo Lu3( )Laijun Liu1( )
Guangxi Key Lab of Optical and Electronic Functional Materials and Devices, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
School of Microelectronics Science and Technology, Sun Yat-sen University, Zhuhai 519082, China
Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
School of Physical Science and Technology & Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China, Suzhou University of Science and Technology, Suzhou 215009, China
Qingdao Haier Smart Technology R&D Co., Ltd., Qingdao 266100, China
School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710071, China
Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology, Guilin University of Electronic Technology, Guilin 541004, China
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Abstract

The electrocaloric effect (ECE), known for its environmentally friendly characteristics, holds significant promise for advancing next-generation solid-state refrigeration technologies. Achieving a large ECE along with a wide working temperature range near room temperature remains a key developmental goal. In this study, we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K (ΔT > 1.52 K) near room temperature in CaZrO3-modified BaTiO3 lead-free ferroelectric ceramics. Furthermore, this achievement was verified using direct methods. The piezoresponse force microscopy (PFM) results suggest that the broad temperature range is attributed to the formation of ferroelectric microdomains and polar nanoregions (PNRs). Furthermore, X-ray photoelectron spectroscopy (XPS) and ultraviolet‒visible (UV‒Vis) spectroscopy reveal a decrease in the oxygen vacancy concentration and an increase in the bandgap for higher CaZrO3 doping levels. These changes synergistically enhance the maximum applied electric field, helping to achieve a high-performance ECE near room temperature. This research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiO3 lead-free ceramics, offering promising prospects for application in next-generation solid-state refrigeration technologies.

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Journal of Advanced Ceramics
Pages 1234-1241
Cite this article:
Wang Z, Meng Y, Tang S, et al. Simultaneous achievement of large electrocaloric effect and ultra-wide operating temperature range in BaTiO3-based lead-free ceramic. Journal of Advanced Ceramics, 2024, 13(8): 1234-1241. https://doi.org/10.26599/JAC.2024.9220932

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Received: 29 March 2024
Revised: 15 June 2024
Accepted: 19 June 2024
Published: 30 August 2024
© The Author(s) 2024.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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