MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Preparation of Iron Fine Particles Coated with Boron Nitride Layers
Hisato TokoroShigeo FujiiTakeo OkuTakashi SegiSaburo Nasu
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2004 Volume 45 Issue 9 Pages 2941-2944

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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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© 2004 The Japan Institute of Metals and Materials
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