The conduction mechanism of Cu–Ge ferrite

The electric conductivity, σσ (DC and AC), drift mobility and dielectric properties of germanium-substituted copper ferrite, with the chemical formula Cu1+xGexFe2−2xO4 (where x=0.0x=0.0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3), have been studied. Plots of lnσTlnσT versus 104/T (K) are linear and showed two sloping regions for all values of xx except for the values 0.0 and 0.05, which showed one slope only. The two activation energies around a kink point called TkTk were calculated. The electrical conduction in these ferrites is explained on the basis of the hopping mechanism. The values of the charge carrier mobility have been calculated from the experimental values of electrical conductivity which increased exponentially with increasing temperature. Dielectric properties such as dielectric loss tangent tanδtanδ were measured at elevated temperature in the frequency range from 102 to 106 Hz. The variation of these parameters with temperature is explained qualitatively. An attempt is made to explain the possible mechanism.