SmCo5 magnetic nanoparticles were preparaed through a simultaneous reduction of Sm(acac)3·xH2O and Co(acac)3 by assistance of Cu(acac)2 and NaBH4 in the presence of oleic acid and oleylamine as a protectant. Supplementation of Cu activated the formation of SmCo5 nanoparticles having a CaCu5 structure, and use of NaBH4 as a reducing agent played an important role to prevent samarium and cobalt from oxidation during preparation. The mean particle diameter was 3.4 nm, having a well-controlled crystal morphology. The magnetic properties of the prepared nanoparticles represented sufficiently high coercivity and magnetization of 1300 Oe and 15.7 emu g−1, respectively, at room temperature.
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Tokonami et al. (2009) studied this question.
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