A series of Co_1-xZn_xFe₂O₄ ferrites with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 were synthesized using the standard double sintering ceramic technique. The single-phase cubic spinel structure of the samples was confirmed from the X-ray diffraction patterns and the sharp high intensity peak revealed that the samples are in good crystalline form. The lattice parameters were observed to increase with the increasing of Zn concentration. By increasing the concentration of Zn content, a significant increase in the density and a subsequent decrease in porosity and grain size were observed. The dielectric constant (ε′) of the sample is found to decrease with the increase in frequency. Dielectric relaxation peaks were observed for the frequency dependence of dielectric loss curves. The dc resistivity at different temperatures was studied and all the samples were of semiconductor nature. The saturation magnetization was found to be reduced as the Zn substitution was increased and consequently permeability decreases.

Keywords: X-ray diffraction, SEM, Permeability, Dielectric, Anisotropy Constant