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Synthesis of SmCo5 nanoparticles with small size and high performance by hydrogenation technique

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Abstract

SmCo5 nanoparticles (NPs) have promising applications in high-density magnetic storage and magnetic nanocomposites. In this work, A novel method to yield SmCo5 particles with small size and high coercivity was reported. Firstly, Sm2O3–Co NPs with size of 6–15 nm were fabricated by a solvothermal route. Then the agglomerated SmCo5 particles were obtained by thermal reduction of the precursor, which show high coercivity of 2.0 T at room temperature. At last, the as-synthesized SmCo5 particles were further hydrogenated under high hydrogen pressure of 4 MPa at room temperature, where hydrogen absorption process could form small-sized SmCo5Hx particles due to their lattice expansion and hydrogen desorption process could convert SmCo5Hx NPs into SmCo5 NPs. The prepared SmCo5 NPs after hydrogenation, showing well distribution, have a small size of 5–20 nm and room temperature coercivity of 1.22 T.

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Acknowledgements

This study was financially supported by the National Natural Science Foundations of China (Nos. 51471016 and 51520105002) and the Key Natural Science Foundation of Beijing (No. 2151002).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Zhen-Hui Ma, Tian-Li Zhang, Hui Wang & Cheng-Bao Jiang

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  1. Zhen-Hui Ma
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  2. Tian-Li Zhang
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  3. Hui Wang
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  4. Cheng-Bao Jiang
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Correspondence to Hui Wang.

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Ma, ZH., Zhang, TL., Wang, H. et al. Synthesis of SmCo5 nanoparticles with small size and high performance by hydrogenation technique. Rare Met. 37, 1021–1026 (2018). https://doi.org/10.1007/s12598-016-0873-6

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