Enhanced low-field magnetocaloric effect in Dy-doped hexagonal GdBO_(3) compounds

作     者：Huicai Xie Lu Tian Lei Zhang Junfeng Wang Hao Sun Xinqiang Gao Zhenxing Li Zhaojun Mo Jun Shen Huicai Xie;Lu Tian;Lei Zhang;Junfeng Wang;Hao Sun;Xinqiang Gao;Zhenxing Li;Zhaojun Mo;Jun Shen

作者机构：Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou341119China Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2023年第41卷第11期

页      面：1728-1735,I0003页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Science Fund for Distinguished Young Scholars (51925605) the National Key R&D Program of China (2019YFA0704904) the National Natural Science Foundation of China (52171195) the Basic Frontier Scientific Research Program of Chinese Academy of Sciences From 0 to 1 Original Innovation Project (ZDBS-LY-JSC017) 

主　　题：Magnetocaloric effect Hexagonal GdBO_(3) Cryogenic magnetic refrigeration Magnetic entropy change Rare earths 

摘      要：Borates have attained increasing attention attributed to their excellent thermal stability,distinctive thermodynamic property,and high mechanical strength in recent years.A series of polycrystalline Dydoped GdBO_(3) compounds was prepared,their crystal structures,magnetic properties,and cryogenic magnetocaloric effects were comprehensively *** compounds crystallize in hexagonal structure(space group P6_(3)/mmc),the lattice constant decreases with the increase of Dy *** in GdBO_(3) significantly reduces critical magnetic field and enhances low-field magnetocaloric *** maximum magnetic entropy changes for the Gd_(1-x)Dy_(x)BO_(3)(x=0.6,0.8,and 1)compounds in a field change of 2 T surpass 17.3 J/(kg·K)at 2.5 K,enhanced by nearly 120%compared to GdBO_(3)(8.0 J/(kg·K)).Besides,the corresponding refrigeration capacity increases from 33.9 to 62.2,57.2,and 72.5 J/kg,respectively,with an enhancement of 70%-110%.The considerable maximum magnetic entropy change,refrigerating capacity,and temperature averaged entropy change make them competitive candidates for cryogenic magnetic refrigeration.