Preparation of Iron Fine Particles Coated with Boron Nitride Layers

Hisato Tokoro; Shigeo Fujii; Takeo Oku; Takashi Segi; Saburo Nasu

doi:10.2320/matertrans.45.2941

Hisato Tokoro, Shigeo Fujii, Takeo Oku, Takashi Segi, Saburo Nasu

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Keywords: iron fine particles, boron nitride layers, catalyst for boron nitride formation

JOURNAL FREE ACCESS

2004 Volume 45 Issue 9 Pages 2941-2944

DOI https://doi.org/10.2320/matertrans.45.2941

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Abstract

Boron (B) powders mixed with hematite or iron (Fe) nanoparticles were annealed at 1573 K in nitrogen atmosphere. X-ray diffraction measurement shows that mixture of B and hematite changed to boron nitride (BN) and metallic Fe after the annealing without the formation of FeB compounds like FeB and Fe₂B. FeB compound was generated from a mixture of B and Fe. High-resolution transmission electron microscopy shows that Fe particles were ∼300 nm in diameter and they were coated with BN layers. Mössbauer spectroscopy revealed a reduction of hematite to Fe. Synthesized Fe fine particles have an oxidation resistance up to 673 K.

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