Abstract
In this work, we used Mössbauer spectroscopy and magnetometry at room temperature to investigate the magnetic properties of four different iron oxide samples (α-FeOOH, γ-Fe2O3, or Fe3O4 and α-Fe2O3) before and after annealing at 1000°C for one hour. We found that after annealing, all four samples exhibited the same properties as hematite (α-Fe2O3). These results show that the iron oxides in this study underwent phase transformations from an initial phase of either α-FeOOH, γ-Fe2O3, or Fe3O4 to a single final phase of α-Fe2O3.
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