Abstract
The effect of plasma-striking atmosphere: air and air+Ar-gas on the crystallization of Fe-oxide phases was studied using dc thermal arc-plasma processing route. The powders were characterized by x-ray diffraction, vibrating sample magnetometry, transmission electron microscopy, and Mössbauer spectroscopy techniques. At room temperature and O2 rich atmosphere, arc-evaporated Fe2+ ions oxidize into either γ-Fe2O3 or Fe3O4 depending upon the combining ratio of Fe with molecular O2. Fe/O ratio could be adjusted using proper flow rate of Ar gas to crystallize the pure γ-Fe2O3.
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