Some physical properties of Mg-Zn ferrites

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Abstract
Electric, dielectric, and structural studies were carried out at room temperature for a series of MgxZnl-xFe204 ferrite samples prepared by the usual ceramic technique. The experimental results showed that the real dielectric constant ε and dielectric loss factor tan δ decrease whereas the ac electrical conductivity σ2 (ω, T) increases on increasing the angular frequency ω. The dc and ac electrical conductivities, real dielectric constant, and dielectric loss factor were found to decrease with increasing Mg ion substitution. The parameters nand B in the power law σ2 (ω, T) = Bωn for the electrical conductivity σ (ω, T) were found to be composition dependent, with both nand B decreasing as the Mg ion addition increased. According to the experimental results, empirical formulae are suggested for the composition dependences of the electrical conductivity σ and the parameters nand B. The analysis of X-ray diffraction patterns showed that the samples investigated have a single phase cubic spinel structure. The bulk and theoretical density, lattice constant, and radius of the tetrahedral ion decrease whereas porosity increases as Mg ion substitution increases. The infrared absorption spectra showed three of the characteristic bands for ferrites with intensities and positions (wavenumbers) that are composition dependent. The fourth band of the infrared spectra V4, related to the lattice vibrations, was too weak to be observed at room temperature.