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Formation of γ-Fe2O3 by thermal decomposition of a mixture of Fe(II)- and Fe(III)-oxalate salts

The formation of γ-Fe2O3 by thermal decomposition of a mixture of Fe(II)- and Fe(III)-oxalate salts was investigated using X-ray diffraction, 57Fe Mössbauer spectroscopy and FT IR spectroscopy. It was found that the ball-milling of the starting chemicals, at the concentration ratio for the Fe3O4 formation, suppressed the formation of α-Fe2O3 as the phase associated with γ-Fe2O3 during the thermal decomposition process. The correlation of the results obtained by X-ray diffraction, 57Fe Mössbauer spectroscopy and FT IR spectroscopy was shown.

Fourier transform infrared spectroscopy ; iron oxalate salts ; maghemite ; X ray diffraction ; ball milling ; mixtures ; Mossbauer spectroscopy ; phase transitions ; pyrolysis ; salts ; synthesis (chemical)

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