The thermolysis of potassium hexa(carboxylato)ferrate(III) precursors, K3[Fe(L)6]·xH2O (L=formate, acetate, propionate, butyrate), has been carried out in flowing air atmosphere from ambient temperature to 900°C.
Various physico-chemical techniques i.e. TG, DTG, DTA, XRD, IR, Mössbauer spectroscopy etc. have been employed to characterize
the intermediates and end products. After dehydration, the anhydrous complexes undergo exothermic decomposition to yield various
intermediates i.e. potassium carbonate/acetate/propionate/butyrate and α-Fe2O3. A subsequent decomposition of these intermediates leads to the formation of potassium ferrite (KFeO2) above 700°C. The same ferrite has also been prepared by the combustion method at a comparatively lower temperature (600°C)
and in less time than that of conventional ceramic method.