Nanocrystalline Iron(III) Oxides Formed under Dynamic Heating of Ferrous Oxalate Dihydrate in Air

摘要: A dynamic study of the thermal decomposition FeC2O4⋅2H2O has been carried out in air range 25–500 °C with a heating rate 5 °C/min using conventional methods analysis including TG and DSC. The phase composition at different calcination temperatures was determined from 57Fe Mossbauer spectra. It found that primary dehydration liberation carbon oxides oxalate structure is followed by direct oxidation Fe(II) to nanocrystalline Fe2O3 large surface area about 250 m2/g. Such nanopowder comprised particles γ‐ α‐Fe2O3 as proved XRD, low temperature spectroscopy HRTEM analysis. In contradiction literature assumption, no traces magnetite (Fe3O4) have identified during oxidative air. simultaneous formation both polymorphs an isochemical structural change maghemite hematite. comparison sp...