Author(s): Gulfam Nasar
Terbium doped magnesium spinel ferrites (Mg1- xTbxFe2O4) and PVA/Mg1-xTbxFe2O4 composites having composition x=0.12, 0.14, 0.16, 0.18 were synthesized using microemulsion method and in-situ polymerization technique respectively. The structural properties were demonstrated using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). XRD analysis confirmed the fabrication of a small concentration of Terbium into the spinel lattice whereas FTIR ex-posed the developed interactions between ferrite nanoparticles with polyvinyl alcohol matrix. The peaks obtained in both the above characterization techniques quite matched with those as reported in the literature and confirmed the formation of resulting nanocomposites. The dielectric and resistivity analyses were performed by determining dielectric parameters and current-voltage measurements. The values of dielectric constant, dielectric loss, and tan δ were inversely proportional to the frequency under the applied electric field at room temperature but become constant at higher frequency values. The lower value of the dielectric constant of terbium incorporated magnesium ferrite polymer composites (MgFe2O4/PVA) is because of hindrance in electron exchange mechanism created by lockup among iron and terbium ions. The resistivity values of all the composites were found from 2.5x109 Ωcm to 18.8x109 Ωcm which showed a non-linear behavior.
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