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This study reports the transformation kinetics of the thermal decomposition of the iron(II) oxalate dihydrate studied in detail by two different techniques: the transmission Mossbauer spectroscopy and the nuclear forward scattering of synchrotron radiation. Both methods were applied to observe three steps of the decomposition process when the iron oxalate transforms to the amorphous iron oxide. The hematite/maghemite ratio was determined from the transmission Mossbauer spectra using an evaluation procedure based on a subtraction of two opposite sides of spectra. The results obtained indicate that the amount of hematite increases with an annealing time prolongation.

Iron oxalate decomposition process by means of Mössbauer spectroscopy and nuclear forward scattering