Nano ferrites with general chemical formula CuxCo1-xFe2O4 (x<1) were synthesized by sucrose method and characterized by X-ray diffraction and IR studies. DC resistivity shows break near Curie temperature indicating the change in conduction mechanism. AC resistivity exhibits large dispersion at low frequency which is in agreement with Koops theory. Dispersion in dielectric constant (ε′) is attributed to Maxwell-Wagner type interfacial polarization. While dispersion in loss angle Tan δ is due to variation in AC resistivity with frequency.
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