STRUCTURAL STUDIES FOR ZNXMG0.8-XNI0.2FE2O4 FERRITES

A series of samples of the system ZnxMg0.8-xNi0.2Fe2O4, (with x=0,0.2, 0.4,0.6 and 0.8), was prepared using the usual ceramic technique. The samples were studied using X-ray diffraction, DTA, TG, TGA and IR spec troscopy. The lattice constant, radius of tetrahedral ion, X-ray densi ty and measured bulk density are found to increase while porosity decr eases as zinc ion content increases. Both TG and TGA spectra show two exothermic phases at the magnetic T-s and Curie T-c transition tempera tures while DTA does not indicate any exothermic processes. The transi tion temperatures were found to increase as Zn ion content decreases. The four IR bands specifying ferrites are observed whose intensities a nd positions are composition dependent.