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Two sets of iron oxide samples were synthesized applying different iron(III) precursors (FeCl₃ and Fe₂(SO₄)₃) and calcination temperature (200, 300, and 500°C). The samples were characterized by powder X-ray analysis and the Fourier transform infrared spectroscopy. Depending on the synthesis conditions, samples of iron oxides with different phase composition were obtained: polyphase (α -Fe₂O₃, γ -Fe₂O₃,...
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