AC conductivity of nanoparticles CoxFe(1−x)Fe2O4 (x=0, 0.25 and 1) ferrites

Nanoparticles of CoxFe(1−x)Fe2O4 (x=0, 0.25 and 1) were prepared by the chemical co-precipitation method. X-ray diffraction and scanning electron microscopy were used to determine the average particle size and morphology of the prepared samples. AC conductivity is found to vary as ωs in the frequency range 42–5×106 Hz. The impedance analysis reveals that low conductivity and high impedance values are observed at low temperatures. The Nyquist impedance plots of the present investigation clearly depict the inherent phenomenon involved in the conduction mechanism of Co doped Fe3O4 ferrites. Regarding frequency dependence of CoxFe(1−x)Fe2O4 AC conductivity the observed behavior clearly indicates that the present ferrites are semiconductor-like.