Synthesis and characterization of polyaniline-hexaferrite composites

Polyaniline was synthesized by chemical polymerization using aniline as monomer, and Y-type hexaferrite with composition (Co sub(2)Mn sub(2)Sr sub(1 .66)Nd sub(0.4)Fe sub(10)O sub(22)) was prepared by co-precipitation assisted by surfactant. Three composites of Polyaniline with different ferrite ratios were prepared by mechanical blending. The synthesized samples were characterized by X-Ray diffraction, Scanning electron microscopy and electrical measurements. The XRD analysis reveals that no second phase was observed in Y-type hexagonal ferrite. In PANI-Ferrite composites, significant changes in resistivity, real and imaginary part of complex permittivity were observed with the increase of ferrite in the polyaniline matrix. At low frequencies the magnitude of dielectric constant and complex permittivity is high with few relaxation peaks. AC conductivity of PANI-Ferrite composites increase with the increase of frequency following Jonscher law. The resistivity and activation energy were found to show similar behavior.