Chemically synthesizing exchange-coupled SmCo_(5)/Sm_(2)Co_(17) nanocomposites

作     者：Yao-Hui Xu Qiang Jiang Kun Li Zhen-Hui Ma Yao-Hui Xu;Qiang Jiang;Kun Li;Zhen-Hui Ma

作者机构：School of Physics and Electronic EngineeringLaboratory for Functional MaterialsLeshan Normal UniversityNanjing 211189China Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical InstrumentsSchool of Mechanical EngineeringSoutheast UniversityNanjing 211189China College of Materials Science and EngineeringKey Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Department of ChemistryBrown UniversityProvidenceRI 02912USA 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第3期

页      面：575-581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）] 080502[工学-材料学] 

基　　金：This study was financially supported by the National Natural Science Foundation of China(No.51701109) the Natural Science Foundation of Beijing Municipality,China(No.2192007) the China Postdoctoral Science Foundation(No.2018M641132) Leshan Normal University Research Program,China(No.LZD021) 

主　　题：SmCo_(5) Nanocomposites Exchange coupling Coercivity 

摘      要：A new strategy to chemically synthesize exchange-coupled SmCo_(5)/Sm_(2) Co_(17) nanocomposites by in situ decomposition of SmCox(5x8.5)is reported in this *** synthesis starts with the fabrication of Co/Sm_(2) O_(3)(Sm to Co atomic ratio of Sn/Co=1:4.2),which can be reduced into 40-nm SmCo_(5) single crystal nanoparticles by Ca under the protection of CaO,showing a high coercivity of 2.85 T and saturation magnetization(Ms)of 0.0671 A·m^(2)·g^(-1).By changing the Sm/Co to 1:4.5,1:4.8 and 1:5.2,SmCo_(5)/Sm_(2) Co_(17) nanocomposites with different proportions were acquired using the same *** to the in situ decomposition of SmCo_(x) intermediate,the small size(both of their size less than 10 nm)and uniform phase distribution were achieved in our ***,the as-prepared nanocomposites display a strong exchange-coupling *** a consequence,SMCo_(5)/Sm_(2)Co_(17)(Sm/Co=1:5.2)exhibits a coercivity of 1.23 T and enhanced M7 T(magnetization at 7 T)of 0.0812 A·m^(2)·g^(-1),increasing by 21%than pure SmCo_(5).Our synthesis provides a new protocol to prepare exchange-coupled high-performance nanocomposites.