Homogeneous solid solution oxalates of Fe2+, Cu2+, Mg2+ and Zn2+ metals were prepared by co-precipitation from respective metal acetate solutions with oxalic acid solution. The thermogravimetric
(TG) analysis of co-precipitated oxalate complexes with general formula MgxCu(0.50-x)Zn0.50Fe2(C2O4)3nH2O (x=0.00, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50) were carried out by manual method in static air atmosphere.
The total mass loss % and stepwise mass loss % values are in good agreement with theoretically calculated mass loss % values.
The thermal decomposition of oxalate complexes occur at relatively lower temperatures (561 to 698 K). The lowering of decomposition
temperatures may be attributed to earlier initiation of Fe2+ oxalate in oxalate complexes.
At temperatures between 598–698 K the thermal decomposition of Cu-Mg-Zn-Fe solid solution oxalate complexes leads to formation
of ferrites of spinel structure. After tampering at 873 and 1273 K, homogeneous ferrites arise, which is revealed from XRD