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 

作者机构：Guangdong Provincial Key Laboratory of Functional Soft Condensed MatterSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Electronic Functional Materials and DevicesHuizhou UniversityHuizhou 516007China Science and Technology on Reliability Physics and Application of Electronic Component LaboratoryThe 5th Electronics Research Institute of the Ministry of Industry and Information TechnologyGuangzhou 510610China Dongguan South China Design Innovation InstituteDongguan 523808China School of Optical and Electronic InformationWuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2022年第11卷第11期

页      面：1777-1788页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 080701[工学-工程热物理] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

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) 

主　　题：lead-free ferroelectric microstructure permittivity polarization electrocaloric effect(ECE) 

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 ***,the development in high ECE materials is still a *** 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 ***(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 *** coexisting structures were confirmed using the X-ray *** merged polarization was confirmed by the dielectric and ferroelectric *** 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.