Synthesis of SmCo5 nanoparticles with small size and high performance by hydrogenation technique
- 181 Downloads
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 SmCo5H x particles due to their lattice expansion and hydrogen desorption process could convert SmCo5H x 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.
KeywordsSmCo5 Nanoparticles Hydrogenation Coercivity
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).
- Liu Y, te Velthuis SGE, Jiang JS, Choi Y, Bader SD. Parizzi AA (2011) Magnetic structure in Fe/Sm–Co exchange spring bilayers with intermixed interfaces. Phys. Rev. B. 2011;83(17):100.Google Scholar
- Strnat KJ. In: Wohlfarth EP, Buschow KHJ (eds) Ferromagnetic Materials, Vol 4. Chapter 2: Rare Earth Cobalt Permanent Magnets. Amsterdam: North-Holland; 1988. 131.Google Scholar
- Yang C, Jia L, Wang S, Gao C, Shi DW, Hou YL, Gao S. Single domain SmCo5@Co exchange-coupled magnets prepared from core/shell Sm[Co(CN)6]·4H2O@GO particles: a novel chemical approach. Sci Rep. 2013;3:354.Google Scholar