Frequency-dependent dielectric and electric modulus properties of Li-Ni-Sm-Fe-O spinel embedded in conducting polymer

Conducting polymeric nanocomposite containing Li-Ni-Sm-Fe-O spinel was synthesized by the chemical oxidizing of aniline in the presence of LiNi0.5Sm0.08Fe1.92O4 particles. The dielectric and electric modulus properties of the as-prepared samples were investigated over a frequency range from 10(6) to 10(9) Hz. The dielectric constant (epsilon'), dielectric loss (epsilon aEuro(3)) and dissipation factor (tan delta) for all samples presented relatively high values at low frequency and were found to decrease with the frequency. The values of epsilon', epsilon aEuro(3) and tan delta of the nanocomposite were lower than that of the pristine PANI. Electric modulus analysis had been carried out to understand the electrical relaxation process. The dielectric relaxation time for the nanocomposite became longer due to the introduction of LiNi0.5Sm0.08Fe1.92O4 particles lowering the crystallinity of PANI.