Abstract
Electric transport properties of cobalt ferrite and barium ferrite composite were studied in the frequency range of 1 Hz to 1 MHz with temperature varying from 100 to 500 °C. The composite with weight ratio 1:1 (CoFe2O4:BaFe12O19) was synthesized by chemical co-precipitation route. Rietveld refined X-ray diffraction analysis revealed pure phase formation of cobalt ferrite, barium ferrite and the prepared composite. For the prepared composite, dual phase refinement procedure was employed. Average crystallite size of CoFe2O4 and BaFe12O19 was observed as 19 nm and 51 nm respectively. The conduction and polarization mechanism in ferrites was explained on the basis of Maxwell–Wagner theory and Koop’s model which reflects the contribution of grain and grain boundaries present in the specimens. The conductivity analysis confirmed the presence of overlapping large polaron tunneling (OLPT) model for conduction.
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