Field-driven merging of polarizations and enhanced electrocaloric effect in BaTiO_(3)-based lead-free ceramics  

作　　者：Xiang NIU Xiaodong JIAN Weiping GONG Wei LIANG Xuetian GONG Guangzu ZHANG Shenglin JIANG Kun YU Xiaobo ZHAO Yingbang YAO Tao TAO Bo LIANG Sheng-Guo LU 

机构地区：[1]Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China [2]Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices,Huizhou University,Huizhou 516007,China [3]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 [4]Dongguan South China Design Innovation Institute,Dongguan 523808,China [5]School of Optical and Electronic Information,Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Advanced Ceramics》2022年第11期1777-1788,共12页先进陶瓷（英文）

基　　金：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);the Open Project Program of Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices,Huizhou University(Grant No.EFMD2022004Z).

摘　　要：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(Sn_(0.07)Ti_(0.93))O_(3)–(1−x)Ba(Hf_(0.1)Ti_(0.9))O_(3) ferroelectric ceramics,where x=0,0.2,0.4,0.6,0.8,and 1.Ba(Sn_(0.07)Ti_(0.93))O_(3) with an orthorhombic phase and Ba(Hf_(0.1)Ti_(0.9))O_(3) 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 DT=2.16±0.08 K at 80℃and 5 MV/m,and DT=3.35±0.09 K at 80℃and 7 MV/m.

关 键 词：lead-free ferroelectric microstructure PERMITTIVITY polarization electrocaloric effect(ECE) 

分 类 号：TN40[电子电信—微电子学与固体电子学] TK124[动力工程及工程热物理—工程热物理] TQ174.1[动力工程及工程热物理—热能工程]