Chemically synthesizing exchange-coupled SmCo5/Sm2Co17nanocomposites
来源期刊：Rare Metals2021年第3期
论文作者：Yao-Hui Xu Qiang Jiang Kun Li Zhen-Hui Ma
文章页码：575 - 581
摘 要：A new strategy to chemically synthesize exchange-coupled SmCo5/Sm2 Co17 nanocomposites by in situ decomposition of SmCox（5 <x <8.5） is reported in this work.Our synthesis starts with the fabrication of Co/Sm2 O3（Sm to Co atomic ratio of Sn/Co=1:4.2）,which can be reduced into 40-nm SmCo5 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·m2·g-1.By changing the Sm/Co to 1:4.5,1:4.8 and 1:5.2,SmCo5/Sm2 Co17 nanocomposites with different proportions were acquired using the same process.Owing to the in situ decomposition of SmCox intermediate,the small size（both of their size less than 10 nm） and uniform phase distribution were achieved in our nanocomposites.Thus,the as-prepared nanocomposites display a strong exchange-coupling interaction.As a consequence,SMCo5/Sm2 Co17（Sm/Co=1:5.2） exhibits a coercivity of 1.23 T and enhanced M7 T（magnetization at 7 T） of 0.0812 A·m2·g-1,increasing by 21% than pure SmCo5.Our synthesis provides a new protocol to prepare exchange-coupled high-performance nanocomposites.
Yao-Hui Xu1，Qiang Jiang1，Kun Li2，Zhen-Hui Ma3,4
1. School of Physics and Electronic Engineering,Laboratory for Functional Materials,Leshan Normal University2. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments,School of Mechanical Engineering,Southeast University3. College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology4. Department of Chemistry,Brown University
摘 要：A new strategy to chemically synthesize exchange-coupled SmCo5/Sm2 Co17 nanocomposites by in situ decomposition of SmCox（5 <x <8.5） is reported in this work.Our synthesis starts with the fabrication of Co/Sm2 O3（Sm to Co atomic ratio of Sn/Co=1:4.2）,which can be reduced into 40-nm SmCo5 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·m2·g-1.By changing the Sm/Co to 1:4.5,1:4.8 and 1:5.2,SmCo5/Sm2 Co17 nanocomposites with different proportions were acquired using the same process.Owing to the in situ decomposition of SmCox intermediate,the small size（both of their size less than 10 nm） and uniform phase distribution were achieved in our nanocomposites.Thus,the as-prepared nanocomposites display a strong exchange-coupling interaction.As a consequence,SMCo5/Sm2 Co17（Sm/Co=1:5.2） exhibits a coercivity of 1.23 T and enhanced M7 T（magnetization at 7 T） of 0.0812 A·m2·g-1,increasing by 21% than pure SmCo5.Our synthesis provides a new protocol to prepare exchange-coupled high-performance nanocomposites.
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