Dielectric behaviour of Ni substituted Cu nano-ferrite

Dielectric properties such as dielectric constant and dielectric loss factor tan delta are reported for Ni substituted Cu ferrite having formula Cu1-xNixFe2O4 prepared by sol-gel auto combustion method. The variation of real part of dielectric constant and dielectric loss tan delta with frequency are measured in the frequency range 1000 Hz to 120 MHz at room temperature. The real part of dielectric constant (epsilon') decreases with the increase in frequency. The relation of tan delta with frequency shows relaxation spectra. Dielectric constant as a function of temperature is studied at different temperatures ranging from 303 K to 623 K.