Structural properties of Cu_xNi_1-xFe₂O₄ nano ferrites prepared by urea-gel microwave auto combustion method

ABSTRACT

Copper-substituted nickel ferrite nanoparticles were prepared via a sol-gel route using urea as a chelating agent. The influence of copper concentration on the microstructure, crystal structure of copper-substituted nickel ferrite nanoparticles has been studied. The results indicate that the substitution of copper influences strongly the microstructure, crystal structure and particle diameter. Powder XRD confirmed single phase cubic structure. Morphology of the particles were studied and particle size was confirmed using SEM. Magnetic properties were studied using VSM method. The dielectric constant and the dielectric loss were increased as the temperature increased at a constant frequency. Dielectric constant (έ) is determined by measuring capacitance (C). Variations of dielectric constant (έ) with frequency as well as temperature have been studied.

KEYWORDS:

• Auto combustion
• SEM
• XRD
• spinel ferrites
• nickel ferrites substitution
• dielectric
• magnetic properties