Composition-tailor induced electrocaloric effect near room temperature in(Pb,Ba)HfO_(3)films  

作　　者：Xian-Xiong Huang Peng-Zu Ge Tian-Fu Zhang Qiu-Xiang Liu Yan-Ping Jiang Zhen-Hua Tang Xiao-Bin Guo Xin-Gui Tang 

机构地区：[1]School of Physics&Optoelectric Engineering,Guangdong University of Technology,Guangzhou,510006,China [2]Jewelry Institute,Guangzhou Panyu Polytechnic,Guangzhou,511483,China [3]School of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen,Guangdong,518055,China

出　　处：《Journal of Materiomics》2023年第3期502-509,共8页无机材料学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11574057,12172093,11904056);the Guangdong Basic and Applied Basic Research Foundation(Grant No.2021A1515012607);Guangdong University Research Platform and Research Project in 2022(Grant No.2022KQNCX216);the China Postdoctoral Science Foundation(Grant No.2022T150158).

摘　　要：More and more researchers start to pay attention to the electrocaloric temperature change(DT)in polar materials,which is caused by an applied electric field.In this paper,Ba-doped PbHfO_(3)(PBH)films were prepared by sol-gel method.Their components,microstructures,dielectric polarization and electro-caloric effects(ECEs)were investigated.With the addition of Ba^(2+),PBH films went from antiferroelectric(AFE)to ferroelectric(FE).At the same time,their dielectric peaks shifted toward lower temperature.The maximum DT obtained in Pb_(0.8)Ba_(0.2)HfO_(3)FE film is 41.1 K,which is an order of magnitude larger than PbHfO_(3)film(△T<4 K at 50℃)and Pb_(0.9)Ba_(0.1)HfO_(3)film(△T<4 K at 120℃).In order to explain this phenomenon,the Landau-Devonshire theory was adopted.Our analysis shows that the rapid variation of energy barrier height near the phase transition temperature is beneficial to obtain large polarization change and high△T,which is needed in solid-state cooling devices.

关 键 词：FERROELECTRIC Electrocaloric effects Landau-Devonshire theory Solid-state cooling 

分 类 号：TB34[一般工业技术—材料科学与工程]