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Chemically synthesizing exchange-coupled SmCo5/Sm2Co17 nanocomposites

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Abstract

A new strategy to chemically synthesize exchange-coupled SmCo5/Sm2Co17 nanocomposites by in situ decomposition of SmCox (5 < x < 8.5) is reported in this work. Our synthesis starts with the fabrication of Co/Sm2O3 (Sm to Co atomic ratio of Sm/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/Sm2Co17 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/Sm2Co17 (Sm/Co = 1:5.2) exhibits a coercivity of 1.23 T and enhanced M7T (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.

Graphic abstract

The exchange-coupled SmCo5/Sm2Co17 nanocomposites with small size (both of their size less than 10 nm) have been chemically synthesized by in situ decomposition of SmCox (5 < x<8.5), which exhibits a coercivity of 1.23 T and enhanced Ms, increasing by 21% than pure SmCo5

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Acknowledgments

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) and. Leshan Normal University Research Program, China (No. LZD021).

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Authors and Affiliations

  1. School of Physics and Electronic Engineering, Laboratory for Functional Materials, Leshan Normal University, Leshan, 614004, China

    Yao-Hui Xu & Qiang Jiang

  2. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

    Kun Li

  3. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing, 100124, China

    Zhen-Hui Ma

  4. Department of Chemistry, Brown University, Providence, RI, 02912, USA

    Zhen-Hui Ma

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  1. Yao-Hui Xu
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  2. Qiang Jiang
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  3. Kun Li
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  4. Zhen-Hui Ma
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Correspondence to Kun Li or Zhen-Hui Ma.

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Xu, YH., Jiang, Q., Li, K. et al. Chemically synthesizing exchange-coupled SmCo5/Sm2Co17 nanocomposites. Rare Met. 40, 575–581 (2021). https://doi.org/10.1007/s12598-020-01516-z

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  • DOI: https://doi.org/10.1007/s12598-020-01516-z

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