Nano Technology

Abstract

The effect of doping of Zinc in Nickel based spinal ferrites with composition (Ni1- xZnxFe2O4) where (x = 0, 0.2, 0.4, 0.6, 0.8, 1) were prepared using chemical co-precipitation method are investigated. Chemical phase analysis was carried out using X-ray diffraction (XRD). XRD results confirm the formation of single phase spinal ferrite structure. XRD results also showed that lattice parameters decreased by increasing Nickel content. Similarly X-ray density of material also increases by increasing Nickel content so porosity decreases. These parameters are very important to effect electric & magnetic properties. Average crystallite size was calculated using XRD diffraction peaks by applying scharer formula. Average crystallite size was observed for all samples in the range of ±10 nm to ±50 nm. Scanning electron microscopy (SEM) was used to investigate the microstructure of ferrites. SEM results showed the homogenous and fine grain structure formation. Fourier Transformed Infer red Microscopy (FTIR) confirms the presence of tetrahedral and octahedral sites in structure. DC electrical resistivity was measured by two probe method. Result showed that DC electrical resistivity increases by increasing Nickel content. This is due to the more resistive nature of Nickel as compared to Zinc. Dielectric properties like dielectric constant, tangent loss and AC conductivity were investigated with respect to composition and applied frequency. Dielectric results showed that dielectric constant and tangent loss decreases by increasing Nickel content and AC conductivity increases with increase in Nickel content. Similarly dielectric constant and tangent loss decreases with increase in frequency and AC conductivity increases with increase in frequency.