The design of BaTiO3 lead-free ceramics enabling an ultrahigh electrocaloric effect and a wide working-temperature range

Yingzhi Meng; Zhaojie Wang; Xiang Niu; Yuleng Jiang; Peng Nong; Silin Tang; Jiyang Xie; Wanbiao Hu; Dingyuan Wang; Biaolin Peng; Sheng-Guo Lu; Laijun Liu

doi:10.1039/D5TA08620E

The design of BaTiO₃ lead-free ceramics enabling an ultrahigh electrocaloric effect and a wide working-temperature range

Yingzhi Meng,^a Zhaojie Wang,^a Xiang Niu,

^b Yuleng Jiang,^b Peng Nong,^c Silin Tang,^d Jiyang Xie,*^e Wanbiao Hu,

*^e Dingyuan Wang,^f Biaolin Peng,

^g Sheng-Guo Lu

*^b and Laijun Liu

*^a

Author affiliations

* Corresponding authors

^a 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, China
E-mail: ljliu2@163.com

^b Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou, China
E-mail: sglu@gdut.edu.cn

^c Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, China

^d School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China

^e Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, Yunnan, China
E-mail: xiejiyang@ynu.edu.cn, huwanbiao@ynu.edu.cn

^f State Key Laboratory of Digital Household Appliances, National Engineering Research Center of Digital Home Networking, Qingdao Haier Smart Technology R&D Co., Ltd, Qingdao 266100, China

^g School of Advanced Materials and Nanotechnology, Xidian University, Xi'an 710071, China

Abstract

The development of a high-performance electrocaloric effect (ECE) is of great importance for local refrigeration (such as the cooling of chips and wearable electronics). However, simultaneously achieving both a large ECE and a wide working-temperature range near room temperature is a long-term challenge in the area of lead-free ceramics. Herein, we disclose a novel lead-free ceramic with a high-performance ECE. Phase coexistence, optimized ferroelectric domain configuration, and ultra-fine grains were constructed by the {Nb⁵⁺, In³⁺} co-doping of Ba_0.9Ca_0.1TiO₃ ceramics. Ultimately, an ultrahigh ECE of 3.0 K and a wide working-temperature range of 97 K were obtained near room temperature in Ba_0.9Ca_0.1Ti_0.89(Nb_0.5In_0.5)_0.11O₃. Furthermore, the origin of the high ECE performance was elucidated based on the microstructure characterized using piezoresponse force microscopy (PFM) and atomic-resolution HAADF-STEM, as well as based on the dielectric and ferroelectric properties. This work provides an innovative approach for achieving a high-performance ECE in lead-free ferroelectric systems.

Journal of Materials Chemistry A

The design of BaTiO₃ lead-free ceramics enabling an ultrahigh electrocaloric effect and a wide working-temperature range

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The design of BaTiO₃ lead-free ceramics enabling an ultrahigh electrocaloric effect and a wide working-temperature range

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