A series of samples of the system ZnIMgo.8-,N~.2Fe~04 (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 spectroscopy. The lattice constant, radius of tetrahedral ion, X-ray density and measured bulk density are found to increase while porosity decreases as zinc ion content increases. Both TG and TGA spectra show two exothermic phases at the magnetic T, and Curie T, transition temperatures while DTA does not indicate any exothermic processes. The transition temperatures were found to increase as Zn ion content decreases. The four IR bands speclfyig femtes are observed whose intensities and positions are composition dependent.

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