Abstract
The manganese (Mn) substituted cobalt ferrite (Co1−xMnxFe2O4) is synthesized by simple ceramic method with x varied from 0 to 0.5 in step of 0.1. The role of Mn substitution on structural, morphological, dielectrical, magnetic and impedance properties of cobalt ferrite has been investigated. Phase identification was performed by X-ray diffraction analysis which shows the spinel cubic crystal structure. The lattice parameter is found to increase with increase in Mn content. The saturation magnetization (Ms) and coercivity (Hc) are measured from hysteresis plots. Dielectric dispersion having Maxwell–Wagner-type interfacial polarization has been observed for cobalt ferrite samples. Dielectric constant and loss tangent are found to decrease with frequency. AC conductivity measurements suggest that the conduction is due to small polaron hopping. The semiconducting behavior of the samples has been studied by dc resistivity measurements. Room temperature complex impedance analysis shows semicircle attributed to the high resistance values at lower frequencies.
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