ESSENCE OF SUPER CAPACITOR AND ELECTRICAL BEHAVIOUR OF CADMIUM NICKEL FERRITE NANOCOMPOSITES PREPARED BY CHEMICAL CO-PRECIPITATION METHOD

Abstract

Composites of cadmium nickel ferrites Cd_xNi_1-xFe₂O₄ (x = 0.3, 0.5  and 0.7) are synthesized by modified chemical co-precipitation method. The crystallite size of the prepared samples, estimates from X-ray diffraction studies and also confirmed that they were single phase with cubic spinel structure. From FTIR analysis the two major absorption bands ν₁ and ν₂ of the samples observed in the regions 600 cm^-1 and 400 cm^-1 are assigned to the vibrations of tetrahedral and octahedral complexes respectively. FESEM images visualize the surface morphology of the prepared sample and it reveals the spherical structure with slight agglomeration. The elemental composition was confirmed by Energy Dispersive X-ray (EDAX) analysis. The spherical shape, having particle size 35 nm was confirmed by HRTEM. The dielectric constant (ε’) loss tangent (tan δ) and AC conductivity was measured at room temperature as a function of frequency (100 Hz to 5MHz), ensure that dielectric constant and loss tangent decreases with the increase of frequency, indicating a decrease in polarization. The prepared sample (Cd_0.3Ni_0.7 Fe₂O₄) shows a better conductivity of 5.2 x 10^-4 S m^-1, which indicates the semiconducting behavior. The CV study for the sample Cd_xNi_1-xFe₂O₄ (x= 0.3) annealed at 600 ^°C exhibits the high specific capacitance of 338 Fg^-1 at low scan rate 2mVs^-1, indicates the suitability of super capacitor application.