Diffusion coefficient of vacancies and jump length of electrons in Co1−xZn x Fe2O4 ferrites

Abstract

A series of polycrystalline samples of Co 1-x Zn x Fe 2 O 4 where (x = 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) were prepared by the usual ceramic technique. X-ray diffraction patterns confirmed the spinel cubic structure. The diffusion coefficients of oxygen vacancies were estimated from dc conductivity measurements. It was noticed that the diffusion coefficient decreases with increasing Zn 2+ concentrations. An increase of temperature increases the diffusion of lattice vacancies. The Curie temperature, lattice parameter and jump length of electrons were studied as a function of Zn 2+ concentration. From the correlation between the ionic radius and the radii of octahedral and tetrahedral sites, the theoretical lattice parameters were calculated and suggested cation distribution for the given ferrites was determined.