The Effect of Catalyst Type on The Microstructure and Magnetic Properties of Synthesized Hard Cobalt Ferrite Nanoparticles.

Abstract

A sol-gel process prepared the nanoparticles of hard cobalt ferrite (CoFe₂O₄). Cobalt nitrate hexahydrate (Co (NO₃)₂⋅6H₂O), iron nitrate nonahydrate (Fe (NO₃)₃⋅9H₂O) with using two catalysis acid (citric acid) and alkaline (hydroxide ammonium) were used as precursor materials. Crystallization behavior of the CoFe₂O₄ nanoparticles were studied by X-ray diffraction (XRD). Nanoparticles phases can change from amorphous to spinel ferrite crystalline depending on the calcinated temperature at 600°C, with using citric acid as a catalysis without finding forgone phase, while using hydroxide ammonium was shown second phase (α-Fe₂O₃) with CoFe₂O₄. Crystallite size was measured by Scherrer’s formula about (25.327) nm and (27.119) nm respectively. Structural properties were investigated by FTIR, which was appeared main bond of (Fe-O), (Co-O), (C-O), and (H-O). Scanning electron microscopy (FE- SEM) was shown the microstructure observation of cobalt ferrite and the particle size at the range about (28.77-42.97) nm. Magnetization measurements were carried out on a vibrating sample magenometer (VSM) that exhibited hard spinel ferrite.