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Mg-induced phase transformation from hematite to maghemite

This paper proposes a simple technique for preparing maghemite (γ-Fe2O3) thin film using RF sputtering without a heating substrate, an oxygen atmosphere, or postannealing. Thin film was prepared using a composite target of Mg chips set on ceramic hematite (α-Fe2O3) in a pure Ar atmosphere on a water-cooled substrate. The results indicated that adding Mg to hematite produces polycrystalline maghemite. In addition, x-ray photo-electron spectroscopy indicated that adding Mg forms a metallic state. Therefore, the film contains a phase mixture of maghemite and metallic Mg.