Preparation, characterization and physical properties of Mg-Zn ferrites

摘要

Polycrystalline nano-sized ferrites with the general chemical formula Mg_(1-x)Zn_x Fe_2O_4 (where x velence 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. Samples 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 temperature shows the break at Curie temperature, indicating the transition from ferrimagnetism to paramagnetism however; the effects of porosity on electric and magnetic properties of the ferrite samples are also discussed.