Síntese e caracterização das nanopartículas de ferrita de níquel dopadas com vanádio

Abstract

This work aimed to synthesize nickel ferrite nanoparticles doped with vanadium and study their structural and magnetic properties. Initially, we performed the synthesis of this ferrite using the sol-gel method with chitosan cross-linked with glutaraldehyde. The gel containing the metal ions is placed in a basic medium and then dried in an oven at a temperature of 80 °C. Subsequently, the material is subjected to a heat treatment at 800 °C for 2 h in a normal atmosphere. We used various concentrations of V in the doping of the Iron site, NiFe(2-x)V(x)O4, however we were only able to dope with a maximum content of 0.5 Fe, i.e. x={0; 0.25; 0.50}. The x-ray diffractograms of the samples showed characteristic peaks of the nickel ferrite phase with crystallite sizes in the range of 14,0-21,4 nm. The magnetic measurements showed ferromagnetic behavior with significant values of coercivity, remanence, and magnetization at a field of 15 kOe in the range of 21,3 - 28,4 emu/g. Soon, the samples produced in chitosan polymer will be analyzed in applications that involves the electrolysis of water