Magnetic properties and magnetic entropy changes of MRE_2Co_7 compounds

作     者：ZHONG XiChun LIU ZhongWu MIN JiXiong TIAN HuaCun GSCHNEIDNER Jr Karl A PECHARSKY Vitalij K 

作者机构：School of Materials Science and Engineering South China University of Technology Ames Laboratory U.S. Department of Energy and Department of Materials Science and Engineering Iowa State University State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2015年第58卷第9期

页      面：86-89页

核心收录：

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

基　　金：supported by the U.S.Department of Energy,Office of Basic Energy Science,Division of Materials Sciences and Engineering The research was performed at the Ames Laboratory.Ames Laboratory is operated for the U.S.Department of Energy by Iowa State University under contract No.DE-AC02-07CH11358 ZHONG X C also thanks the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Education Ministry of China(Grant No.x2cl B7120290) the Guangzhou Municipal Science and Technology Program(Grant No.12F582080022) the Fundamental Research Funds for the Central Universities of China(Grant Nos.2012ZZ0013 and 2014ZZ0005) 

主　　题：(La0.5Ce0.5)2Co7 compound (Ce0.65Pr0.35)2Co7 compound magnetic property magnetic entropy change 

摘      要：(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds for magnetic refrigeration were studied by X-ray diffraction, ac susceptibility and isothermal magnetization measurements. X-ray powder diffraction shows that all the compounds have hexagonal Ce2Ni7-type structure. The Curie temperatures(TC) are 258 K and 222 K for(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds, respectively. High coercivities(HC) of about 1.74 and 6.61 k Oe at 5 K with a smooth demagnetization curves were obtained for the(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds, respectively. For an applied field change from 0 to 50 k Oe, the maximum(??SM) for(La0.5Ce0.5)2Co7 and(Ce0.65Pr0.35)2Co7 compounds are 0.52 and 0.67 J/(kg K), respectively.