DIELECTRIC-PROPERTIES OF HYDROTHERMAL NICKEL-ZINC FERRITES

NiZn ferrites were hydrothermally prepared and sintered at different e xperimental conditions, leading to materials of composition Ni0.34Zn0. 60Fe2.06O4. An investigation of the dielectric properties over a wide frequency range showed the semiconductor character of the ferrites and the presence of a masked relaxation, revealed after a mathematical tr eatment. The relaxation was modeled using a Cole-Cole model and the pa rameters correlated with the microstructural evolution of the ferrites during the sintering. The contributions of hopping electrons and spac e charges to the total conductivity have been discussed.