Structural , Dielectric and Magnetic Behavior of Cu 2 + Substituted Ni - Zn Ferrite by Auto - combustion Technique

Structural and magnetic properties of Cu 2+ substituted Ni0.8-xCuxZn0.2Fe2O4 ferrites for x = 0.0 to 0.6 with the step increment of 0.2 prepared by an auto-combustion method have been investigated. The X-ray diffraction pattern of these compositions confirmed the formation of the single phase spinel structure. Further, the XRD have been used to calculate the lattice parameter and grain size. The particle size of the starting powder composition varied from 25 nm to 40 nm. The morphological investigations and nanometric sizes of the samples was studied by using scanning electron microscopy and transmission electron microscopic techniques. Dielectric constant varied from 75 to 3000 with frequency, rise in copper concentration and temperature. All the samples follow the MaxwellWagner’s interfacial polarization. Saturation magnetization decreased from 152.15 emu/g to 42.05 emu/g for as burnt samples and from 48.63 emu/g to 43.368 emu/g for samples sintered at 700 o C . The influence of Cu substituent on Ni-Zn ferrite is investigated by UV measurement at room temperature and at 700 o C. These nanoferrites may have application in core materials and in electronic device technology.