Effect of Cr Substitution on Magnetic Properties of Co-Cu Nano Ferrites

Abstract

Cr-substituted cobalt ferrite nanoparticles Co_0.5Cu_0.5Fe_2-xCr_xO₄ with (x = 0.0, 0.05, 0.10, 0.15 and 0.20) are prepared by sol-gel method in which the as-burnt powders sintered at 1100 ?C for 4h. The structural properties of all prepared samples were studied by X-ray diffraction (XRD). The results confirm the spinel cubic structure. The crystallite size was reduced significantly with the Cr³⁺ ions substitution. The agglomeration of spherical and polyhedral shape with 22.15-33.25 nm size was shown in FE-SEM image. Two absorption bands are seen around 600 cm^-1 and 400 cm^-1 from FTIR study. The range corresponds to the tetrahedral and octahedral sites, respectively. The Cr³⁺ addition reduces the magnetic saturation and coercivity, which helps for its use in data storage.

Keywords- Nanoparticle ferrites; Spinel ferrites; X-ray diffraction; FE-SEM; magnetic properties; Co-Cu-Cr ferrites.