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The real and imaginary parts of the relative permittivity (ε'r and ε''r) as well as the a.c. resistivity of the mixed ferrite CoxZn1−xFe2O4 (x = 0.1 → 1.0) were measured as a function of temperature and frequency. The calculated values of the activation energy indicate that the conductivity of the system increased with increasing Zn concentration. The Curie temperature of the system as determined from a.c. conductivity measurements agree well with that of the relative permittivity. The calculation of the relaxation time (τ) from Cole-Cole plots indicates that its maximum value occurs at the critical concentration (x = 0.6). The grain size was calculated at different Co concentration with values ranged from 0.995 × 10−7 to 0.617 × 10−7 mm.

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