Investigation of Structural, Morphological and Magnetic Properties of MFe 2 O 4 (M = Co, Ni, Zn, Cu, Mn) Obtained by Thermal Decomposition.

The structural, morphological and magnetic properties of MFe 2 O 4 (M = Co, Ni, Zn, Cu, Mn) type ferrites produced by thermal decomposition at 700 and 1000 °C were studied. The thermal analysis revealed that the ferrites are formed at up to 350 °C. After heat treatment at 1000 °C, single-phase ferrite nanoparticles were attained, while after heat treatment at 700 °C, the CoFe 2 O 4 was accompanied by Co 3 O 4 and the MnFe 2 O 4 by α-Fe 2 O 3 . The particle size of the spherical shape in the nanoscale region was confirmed by transmission electron microscopy. The specific surface area below 0.5 m 2 /g suggested a non-porous structure with particle agglomeration that limits nitrogen absorption. By heat treatment at 1000 °C, superparamagnetic CoFe 2 O 4 nanoparticles and paramagnetic NiFe 2 O 4 , MnFe 2 O 4 , CuFe 2 O 4 and ZnFe 2 O 4 nanoparticles were obtained.