Structural studies for Zn_xMg_0.8-xNi0.2Fe₂O₄ ferrites

Abstract

A series of samples of the system Zn _x Mg_0.8—x Ni_0.2Fe₂O₄ (with x=0,0.2,0.4,0.6 and 0.8), was prepared using the usual ceramic technique. The samples were studies 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_s and Curie T_c 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 specifying ferrites are observed whose intensities and positions are composition dependent.

Key Words:

• Structural study
• thermal study
• ferrites