Abstract
Nanometer-sized α-Fe particles formed by the gas evaporation method were transferred into the microwave plasma region with a carrier gas of Ar including a small amount of CH 4. Particles collected after the plasma region were found to show a composite phase of Fe-C system that consisted of α-Fe and γ-Fe (Austenite) and Fe 3C. Moessbauer spectroscopy was used to estimate the relative yield of these three phases. An increase of γ- Fe is followed by the decrease of α-Fe with increasing CH 4 content. Formation of Fe 3C was recognized at 0.5 vol% of CH 4 in Ar gas and became more remarkable when the CH 4 content was increased. HRTEM observation revealed the individual particles to be a concentric shell structure composed of the Fe-C system.
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