Preparation, characterization and physical properties of Mg-Zn ferrites

Abstract

Polycrystalline nano-sized ferrites with the general chemical formula Mg₁₋x Znx Fe₂O₄z (where x = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared from a simple polymer matrix based precursor solution. The solution was composed of metal nitrates with polymer PVA and Sucrose. Thermolysis of the precursor mass at about 773 K resulted in the oxide phase. Sam-ples of ferrites were characterized by various experimental techniques including scanning electron microscopy (SEM), X-ray diffraction studies, IR studies and VSM (vibrating sample magnetometer) analysis. The variation of resistivity with tempera-ture shows the break at Curie temperature, indicating the transition from ferrimagnetism to paramagnetism however; the ef-fects of porosity on electric and magnetic properties of the ferrite samples are also discussed.