Dielectric Behaviour of Ni0.2Cu0.2Zn0.6Fe2O4 Spinel Ferrite

Dielectric properties such as dielectric constant (epsilon') and dielectric loss tangent (tan delta) are reported for Cu substituted Ni-Zn ferrite having formula Ni0.2Cu0.2Zn0.6Fe2O4 prepared by sol-gel auto combustion method. T he variation of dielectric constant, dielectric loss tangent and A. C. conductivity with frequency are measured in the frequency range 1000 Hz to 120 MHz at room temperature. the real part of dielectric constant decreases with the increase in frequency where as the A. C. conductivity (sigma(ac)) increases with increase in frequency. The relation of tan delta with frequency shows resonance peak. Dielectric constant as a function of temperature is studied at different temperatures ranging from 353 K to 583 K.