Preparation of Iron Fine Particles Coated with Boron Nitride Layers

摘要

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 Fe{sub}2B. FeB compound was generated from a mixture of B and Fe. High-resolution transmission electron microscopy shows that Fe particles were ～300nm in diameter and they were coated with BN layers. Mossbauer spectroscopy revealed a reduction of hematite to Fe. Synthesized Fe fine particles have an oxidation resistance up to 673 K.