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Summary: A conducting polymer, polyaniline (PANI)/Ni 0.5 Zn 0.5 Fe 2 O 4 nanocomposites were synthesized by a simple and inexpensive one-step in-situ polymerization of Aniline monomer with Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles, where Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles were prepared via simple solution combustion method using stoichiometric composition of nickel nitrate, zinc nitrate and ferric nitrates as oxidizers and urea as a fuel. PANI/Ni 0.5 Zn 0.5 Fe 2 O 4 nanocomposites were characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) spectroscopy and Thermal gravimetric-differential thermal analysis (TG-DTA). Frequency dependence of dielectric constant (e 0 ), dielectric loss tangent (tand) and a. c. conductivity (s ac ) studies have been undertaken on the PANI/Ni 0.5 Zn 0.5 Fe 2 O 4 nanocomposites in the frequency range 100 Hz-5 MHz at room temperature. Dielectric properties such as dielectric constant (e 0 ) and dielectric loss tangent (tand) are found to decrease with the increase in the frequency. Further, a. c. conductivity (s ac ) of the PANI/Ni 0.5 Zn 0.5 Fe 2 O 4 nanocomposites was found to increase with an increase in the frequency. Observed variation in the a. c. conductivity with the frequency has been understood on the basis of electron hopping model.

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