Detailed studies on structural, morphological, optical, magnetic and mossbauer properties of Cu-substituted cobalt ferrite nanoparticles

In this research, the effect on the morphology, structure, optic, magnetic and Mossbauer features of Cu 2+ doping in Co 1−x Cu x Fe 2 O 4 (x = 0.0–1.0) nanoparticles fabricated using the sol-gel auto-combustion reaction method were investigated. The mainly pure phase structure of Co-spinel was observed in x-ray diffraction (XRD) patterns. The sizes of crystal were observed in between 28.77–36.25 nm. The fundamental vibrational bands of the nanoparticles have been found at 426 and 602 cm −1 wavelengths via the Fourier transform infrared (FT-IR) spectrum. The most of Co 2+ ions are located at the A site and that substitution by Cu +2 ions at the octahedral site for x = 0.0, 0.25, and 0.50. for x = 0.75 content, the Mössbauer results show that some Cu 2+ ions are present in both A and B sites. Magnetization measurements at room temperature show that Cu 2+ substitution into Co-ferrite significantly changes the magnetic quantities such as coercivity field ( Hc ), remnant ( Mr ) and saturation magnetization ( Ms ). Magnetic hysteresis curves obtained at room temperature show well-known S -shaped features for all nanoparticles with Ms values of 51.5–64.4 emu g −1 , Mr values of 31–36 emu g −1 and H c values of 429.5–1447.8 Oe.