Abstract:
Nanoparticles of Mg(1-2x) (Co Ni)x Fe2O4, where x= 0.05, 0.10, 0.15, 0.20, 0.25 were synthesized by using sol-gel (auto-combustion) technique. X-Ray Powder Diffraction (XRD) for structural analysis, (FTIR) Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy (SEM) for morphological and surface analysis and Impedance Analyzer were used to investigate the dielectric properties of prepared samples. The XRD data patterns confirmed the formation of pure FCC (Face Centered Cubic) single phase spinel ferrite nanoparticles. The XRD data1was1used1to1calculate crystallite1size1for1each1sample and was in range from 59 ± 6nm. SEM results showed the uniformly synthesized nanoparticles. Octahedral and tetrahedral bands positions were confirmed using FTIR data. Dielectric properties were studied with the change of frequency at room temperature. Dielectric properties of prepared samples were found to be enhanced by increasing the cobalt and nickel content. The dielectric constant for pure magnesium ferrite was 43 which was increase 98% for the sample with highest cobalt and nickel content (x= 0.25) at 100HZ. Meanwhile increase of 99% was observed in dielectric loss and tangent loss values by increasing nickel and cobalt content. The increasing trend in AC conductivity was also observed with increasing frequency value. These results of AC impedance and electric modulus also suggested that this type of material can be investigated for supercapacitor, microwave absorbance applications.
