Boron nitride (BN) nanolayers encapsulating iron (Fe) fine particles have been synthesized by annealing mixtures of hematite (α-Fe2O3) and boron powders at 1373 K for 2 hours in nitrogen atmosphere. The Fe particles had an average diameter of ~300 nm with BN nanolayers coating of ~10 nm. The α-Fe2O3 was transformed into Fe and then Fe-B on a process of annealing. The Fe-B was decomposed into Fe and BN, and consequently Fe particles coated with BN nanolayers were synthesized. They showed soft magnetic properties with coercivity of 1.5 kA/m. The BN nanolayers encapsulation was effective on improving oxidation resistance. BN nanotubes with diameter of ~100 nm were also synthesized as a resultant product by this method.
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Tokoro, H., Fujii, S., Oku, T. et al. Synthesis of boron nitride nanolayers encapsulating iron fine particles and boron nitride nanotubes. MRS Online Proceedings Library 789, 270–275 (2003). https://doi.org/10.1557/PROC-789-N3.34