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 

机构地区：[1]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 [2]School of Microelectronics Science and Technology,Sun Yat-sen University,Zhuhai 519082,China [3]Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China [4]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 [5]Qingdao Haier Smart Technology R&D Co.,Ltd.,Qingdao 266100,China [6]School of Advanced Materials and Nanotechnology,Xidian University,Xi'an 710071,China [7]Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology,Guilin University of Electronic Technology,Guilin 541004,China

出　　处：《Journal of Advanced Ceramics》2024年第8期1234-1241,共8页先进陶瓷（英文）

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).

摘　　要：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(AT>1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) 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 CaZrO_(3) 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 BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.

关 键 词：BaTiO_(3) electrocaloric effect oxygen vacancy band-gap 

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]