Revista de ciencias e ingeniería de materiales

Impedance Spectroscopic Studies of NiMgCuZn Ferrites

Abstract

Varalaxmi N

A series of Ni substituted MgCuZn polycrystalline ferrite were prepared by a high energy ball-milling followed by the standard double sintering ceramic technique to investigate the impedance spectroscopic studies, within the frequency and temperature range of 100 Hz to 1 MHz at various temperatures within the range of 30oC-490oC these studies were carried out. XRD and SEM patterns were taken to confirm the formation of single phase cubic structure and the grain size. The complex-plane impedance spectra indicates that the material can be represented by both bulk and the grain boundary phenomena at high and low frequencies respectively as two semi-circular arcs was observed. The results of the real impedance Z′ and imaginary part Z′′ at low frequencies are discussed as being attributed to the interfacial polarization; The results of real impedance Z' and imaginary part Z" at various frequiences are discussed along with the dielectric properties of temperature and frequency.