Thermal analysis of alkaline earth metal ferrisuccinate precursors, M3[Fe(C4H4O4)3]2�xH2O (M=Mg, Ca) has been studied isothermally and non-isothermally employing simultaneous TG-DTG-DSC, XRD, IR and M�ssbauer spectroscopy
to characterize the intermediates/end products. After dehydration, the anhydrous complexes decompose to yield an iron(II)
oxalate intermediate, Fe(II)C2O4 in the temperature range 180–250�C. Decomposition of this iron(II) species leads to the formation of α-Fe2O3 and respective alkaline earth metal oxide/carbonate in the temperature range 250–300�C. Finally, ferrites of the stoichiometry,
MgFe2O4 and Ca2Fe2O5 are formed as a result of solid-state reaction between α-Fe2O3 and MO/MCO3. A special feature of the precursor method, adopted by us, is that the formation of ferrites occurs at much lower temperature
than that of conventional ceramic method.
decomposition of transition metal malonates, MCH2C2O4⋅xH2O and transition metal
succinates, M(CH2)2C2O4⋅xH2O (M=Mn,
Fe, Co, Ni, Cu, Zn) has been studied employing TG, DTG, DTA, XRD, SEM, IR
and Mssbauer spectroscopic techniques. After dehydration, the anhydrous
metal malonates and succinates decompose directly to their respective metal
oxides in the temperature ranges 310–400 and 400–525C, respectively.
The oxides obtained have been found to be nanosized. The thermal stability
of succinates have been found to be higher than that of the respective malonates.
The thermal decomposition of manganese tris(malonato)ferrate(III) hexahydrate, Mn3[Fe(CH2C2O4)3]2 . 6H2O has been investigated from ambient temperature to 600 °C in static air atmosphere using various physico-chemical techniques,
i.e., simultaneous TG-DTG-DSC, XRD, Mössbauer and IR spectroscopic techniques. Nano-particles of manganese ferrite, MnFe2O4, have been obtained as a result of solid-state reaction between a-Fe2O3 and MnO (intermediate species formed during thermolysis) at a temperature much lower than that for ceramic method. SEM analysis
of final thermolysis product reveals the formation of monodisperse manganese ferrite nanoparticles with an average particle
size of 35 nm. Magnetic studies show that these particles have a saturation magnetization of 1861G and Curie temperature of
300 °C. Lower magnitude of these parameters as compared to the bulk values is attributed to their smaller particle size.