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Chromium substituted cobalt ferrite with grain size less than the singledomain (approx. 70 nm) has been prepared by the sol-gel method. XRD analysisreveals that the samples crystallize to cubic symmetry with spacegroup number227. Two transition temperatures (TD (approx. 450 K) and TM (approx. 600 K)have been observed from the impedance verses temperature measurement. TDincreases with the increase in frequency due to dipole response to thefrequency. TM is comparable with the para-ferrimagnetic transition temperatureof cobalt ferrite, which is independent of frequency. This result is wellsupported by the temperature dependent DC conductivity measurement. Themodified Debye relaxation could be explained the impedance spectra ofCoFe2-xCrxO4. The grain and grain boundary effect on impedance spectroscopy hasbeen observed from Cole-Cole analysis. The ac conductivity follows Arrheniusbehavior at different frequencies. All the samples exhibit the negativetemperature coefficient of resistance behavior which reveals the semiconductingbehavior of the material. The Mott VRH model could explain the DC electricalconductivity. Both ac impedance and DC resistivity are well co-related eachother to explain the electron transport properties in Cr substituted cobaltferrite. The electrical transport properties could be explained by the electronhopping between different metal ions via oxygen in the material.

Enhancement of Impedance by Chromium Substitution and Correlation with DC Resistivity in Cobalt Ferrite