Abstract
Co and Ni substituted znic ferrite nanoparticles (Zn1-xCo0.5xNi0.5Fe2O4) (000< x -? 0.75) were synthesized by cu precipitation method. X-ray diffraction and Fourier transform infrared spectroscopy confirmed the single phase spinet structure. The lattice constant decreased with the increased Co and Ni contents. The bulk density was found less as compared to the X-ray density and this difference was explained in terms of porosity. The crystallite size was calculated by Scherrer's formula and found in the range 20-50 nm. Two prominent stretching bands were observed in MLR spectra around 400-600 cm 1. These two bands confirmed the spinet structure of the prepared nanoparticles. The saturation magnetization was found to increase upto x=0.60 from 1.31 ernufg to 81.2 ernufg then it decreased for x=0.75 to the value of 75.1 emufg. The coercivity and retentivity were found in the range 35.36-226.125 Oe and 0.0135-19.8 emu/g, respectively. Dielectric parameters were decreased with the increased Ni-Co contents. About nine told increase in the DC-electrical resistivity was obtained for the Zn0.25Co0.375Ni0.375Fe2O4 (2.8979 x 10(10) Omega cm) as compared to the ZnFe2O4 (0.2974 x 10(10) Omega cm) nanoparticles. (C) 2015 Elsevier B.V. All rights reserved