Enhanced low-field magnetocaloric effect in Nb and Al co-substituted EuTiO_(3)compounds  

作　　者：Huicai Xie Wenxia Su Haiming Lu Zhaojun Mo Dunhui Wang Hao Sun Lu tian Xinqiang Gao Zhenxing Li Jun Shen 

机构地区：[1]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China [2]Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China [3]National Laboratory of Solid State Microstructures,Jiangsu Provincial Key Laboratory for Nanotechnology,School of Physics,Nanjing University,Nanjing 210093,China [4]Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Journal of Materials Science & Technology》2022年第23期137-144,共8页材料科学技术（英文版）

基　　金：supported financially by National Key R&D Program of China(No.2021YFB3501204);the National Science Fund for Distinguished Young Scholars(No.51925605);the National Natural Science Foundation of China(Nos.52171195 and 52171054);the Basic Frontier Scientific Research Program of Chinese Academyof Sciences From 0 to 1 Original Innovation Project(No.ZDBS-LYJSC017);the Key Research Program of Chinese Academy of Sciences(No.ZDRW-CN-2021-3)。

摘　　要：The magnetic ground state switching between antiferromagnetic(AFM)and ferromagnetic(FM)states in EuTiO_(3)provides the feasibility of regulating its magnetic properties and magnetocaloric effect.First-principles calculations demonstrate that the magnetic ground states for EuTi_(0.875)Nb_(0.0625)Al_(0.0625)O_(3),EuTi_(0.8125)Nb_(0.125)Al_(0.)0_(625)O_(3),and EuTi_(0.75)Nb_(0.125)Al_(0.125)O_(3)are FM coupling.Experimental results also exhibit the FM coupling domination in these compounds,accompanied by a significantly enhanced low magnetic field magnetocaloric effect.The maximum magnetic entropy change of all the samples surpasses15 J kg^(-1)K^(-1)with a field change of 1 T.which is 1.4 times as large as that of bulk EuTiO_(3).Especially,the maximum refrigerating capacity for EuTi_(0.8125)Nb_(0.125)Al_(0.0625)O_(3)compound is evaluated to be 88.1 J kg^(-1),more than three times of that of EuTiO_(3).The remarkable magnetocaloric performances prove Nb and Al co-substituted EuTiO_(3)compounds to be competitive candidates for magnetic refrigeration in the liquid helium temperature regime.

关 键 词：Magnetocaloric effect Europium titanate(EuTiO_(3)) FERROMAGNETIC Magnetic refrigeration 

分 类 号：TB64[一般工业技术—制冷工程]