Simultaneous achievement of large electrocaloric effect and ultrawide operating temperature range in BaTiO_(3)-based lead-free ceramic

作     者：Zhaojie Wang Yingzhi Meng Silin Tang Xiang Niu Hongfang Zhang Dingyuan Wang Yisong Bai Bialin Peng Xue Chen Qingqing Ke Sheng-Guo Lu Laijun Liu 

作者机构：Guangxi Key Lab of Optical and Electronic Functional Materials and DevicesCollaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China School of Microelectronics Science and TechnologySun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Research Center on Smart Materials and Energy Conversion DevicesSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Physical Science and Technology&Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of ChinaSuzhou University of Science and TechnologySuzhou 215009China Qingdao Haier Smart Technology R&D Co.Ltd.Qingdao 266100China School of Advanced Materials and NanotechnologyXidian UniversityXi'an 710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing TechnologyGuilin University of Electronic TechnologyGuilin 541004China 

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

年 卷 期：2024年第13卷第8期

页      面：1234-1241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：This work was financially supported by the Science and Technology Plan of Guangxi(Nos.AA21238001,ZY22096019,AA21077012,AA22068080,and AA23023027l) the Key R&D Program of Shandong Province(No.2022CXGC020203) the National Natural Science Foundation of China(Nos.12264012,62271362,and 12304120) the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(CAST)(No.2021QNRC001) the Natural Science Foundation of Guangdong Province(No.2022A1515111013) the Science and Technology Plan of Guilin(Nos.2022H03 and ZY20220101) the Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology(No.22-35-4-S011) the National Natural Science Foundation of China(Nos.52272105 and 52202130) the NSFC-Guangdong Joint Fund(No.U1501246) the Dongguan City Frontier Research Project(No.2019622101006) the Advanced Energy Science and Technology Guangdong Provincial Laboratory Foshan Branch-Foshan Xianhu Laboratory Open Fund-Key Project(No.XHT2020-011) 

主　　题：BaTiO_(3) electrocaloric effect oxygen vacancy band-gap 

摘      要：The electrocaloric effect(ECE),known for its environmentally friendly characteristics,holds significant promise for advancing next-generation solid-state refrigeration *** a large ECE along with a wide working temperature range near room temperature remains a key developmental *** this study,we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K(AT1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) lead-free ferroelectric ***,this achievement was verified using direct *** 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 CaZrO_(3) doping *** changes synergistically enhance the maximum applied electric field,helping to achieve a high-performance EcE near room *** research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.