PREPARATION AND CHARACTERIZATION OF ZINC SUBSTITUTED COBALT FERRITE NANO-PARTICLES BY CITRATE GEL METHOD

摘要

A novel citrate gel method was used to synthesize Zinc substituted Cobalt ferrite nano-particles with chemical formula Co_(1-x)Zn_xFe_2O_4 where x=0, 0.2, 0.4, 0.6, 0.8 and 1). X-ray diffractions studies conformed the spinel formation of nano-ferrite structure and the particle size in the range of 17-24nm. TEM studies confirm the particles size of the nano-ferrites in nanorange. Electron diffraction patter of Co_(0.4)Zn_(0. 6)Fe_2O_4 sample indicating small Particle size of nano crystalline sample. The broad rings suggest a small particle size. The starting materials used in the preparation of cobalt-zinc nano particles are Cobalt nitrate, Zinc nitrate, Ferric nitrate and citric acid having molar ratio of 1:3 were dissolved in de-ionized water. Citric acid acts as chelating agent and helps in the homogenous distribution of metal ions. The pH of the solution is adjusted to 7 by using ammonia solution.