Electrical Transport Phenomenon in Nanoparticle CuxCo1-xFe2-2yAl2yO4 Ferrite System

The polycrystalline aluminium substituted nanoparticle size copper cobalt ferrite samples CuxCo1-xFe2-2yAl2yO4 (where x= 0.0, 0.2, 0.4, 0.6, 0.8, 1.0; y = 0.05, 0.15 and 0.25) have been prepared by standard ceramic technique. The lattice constants of the phases are evaluated from x-ray diffraction data. The effects of Al on both AC and DC Electrical properties are studied. DC Electrical resistivity is found to increase with increase of aluminium and copper content. Activation energies in ferromagnetic region are found very less than that of paramagnetic region. The dielectric constant, complex permittivity and dielectric loss tangent (tanδ) measured at room temperature as a function of the frequency. The effect of Alion substitution of copper cobalt ferrite on the AC electrical resistivity and dielectric properties in frequency range 20 Hz to 1MHz. were studied. The data revealed that and tanδ decreased as the Alion increased, due to the increase in the number of vacancies at the iron site. Keywords— polycrystalline, DC Electrical resistivity, activation energy and AC electrical resistivity