Unveiling a giant electrocaloric effect at low electric fields through continuous phase transition design  

作　　者：Yunyao Huang Leiyang Zhang Pingji Ge Ruiyi Jing Wenjing Shi Chao Li Xiang Niu Vladimir Shur Haibo Zhang Shengguo Lu Yintang Yang Dawei Wang Xiaoqin Ke Li Jin 

机构地区：[1]Electronic Materials Research Laboratory,Key Laboratory of the Ministry of Education,School of Electronic Science and Engineering,Faculty of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an,710049,China [2]School of Physics,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,Xi’an Jiaotong University,Xi’an,710049,China [3]Instrument Analysis Center,Xi’an Jiaotong University,Xi’an,10049,China [4]Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices,School of Materials and Energy,Guangdong University of Technology,Guangzhou,510006,China [5]School of Natural Sciences and Mathematics,Ural Federal University,Ekaterinburg,20000,Russia [6]School of Materials Science and Engineering,State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan,430074,China [7]School of Microelectronics,Xidian University,Xi’an,710071,China [8]Functional Materials and Acousto-Optic Instruments Institute,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin,150080,China

出　　处：《Advanced Powder Materials》2024年第5期33-45,共13页先进粉体材料（英文）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52261135548);the Key Research and Development Program of Shaanxi(Program No.2022KWZ-22);The research was made possible by Russian Science Foundation(Project No.23-42-00116);The equipment of the Ural Center for Shared Use“Modern nanotechnology”Ural Federal University(Reg.No.2968)which is supported by the Ministry of Science;Higher Education RF(Project No.075-15-2021-677)was used.

摘　　要：The reported electrocaloric(EC)effect in ferroelectrics is poised for application in the next generation of solidstate refrigeration technology,exhibiting substantial developmental potential.This study introduces a novel and efficient EC effect strategy in(1-x)Pb(Lu_(1/2)Nb_(1/2))O_(3)-xPbTiO_(3)(PLN-xPT)ceramics for low electric-fielddriven devices.Phase-field simulations provide fundamental insights into thermally induced continuous phase transitions,guiding subsequent experimental investigations.A comprehensive composition/temperature-driven phase evolution diagram is constructed,elucidating the sequential transformation from ferroelectric(FE)to antiferroelectric(AFE)and finally to paraelectric(PE)phases for x=0.10-0.18 components.Direct measurements of EC performance highlight x=0.16 as an outstanding performer,exhibiting remarkable properties,including an adiabatic temperature change(ΔT)of 3.03 K,EC strength(ΔT/ΔE)of 0.08 K cm kV-1,and a temperature span(Tspan)of 31℃.The superior EC effect performance is attributed to the temperature-induced FE to AFE transition at low electric fields and diffusion phase transition behavior contributing to the wide Tspan.This work provides valuable insights into developing high-performance EC effect across broad temperature ranges through the strategic design of continuous phase transitions,offering a simplified and economical approach for advancing ecofriendly and efficient solid-state cooling technologies.

关 键 词：PbPb(Lu_(1/2)Nb_(1/2))O_(3)-xPbTiO_(3)(PLN-PT) Electrocaloric effect(ECE) Phase transition Low electric field ANTIFERROELECTRIC 

分 类 号：TG1[金属学及工艺—金属学]