Studying the effect of adding Mo on the optical and structural properties of the CoFe2O4 compound

In this work, the structural properties of CoFe 2- x Mo x O 4 (0.0 ≤ x ≤ 0.4) ferrites were investigated. Polycrystalline samples were prepared by chemical method and characterized by the X-ray diffraction and scanning electron microscopy. X-ray diffraction patterns show that all samples have a cubic spinel structure, and the lattice parameter a decreases monotonically with increase in Mo concentration. Scanning electron micrographs indicate that most of the particles are in the range of 400–850-nm size. The saturation magnetization, M s , values of Mo-doped samples are larger than the parent compound with a maximum value of 106 emu/g for x = 0.2 sample. In general, in the absorption spectrum, a decrease in absorbance is observed with increasing wavelength. This phenomenon occurs because only photons with energy greater than the material's energy gap at the absorption edge are able to interact with the material, leading to the formation of electron pairs. It can be seen that the absorbance increases slightly with increasing Mo ratio. The thickness of the film is 500 nm.