Background: Spinel ferrites, MFe2O4 (M: Co, Ni, Mg, Cr, Zn, Fe) are important materials that make them suitable for various industries, biomedical and environmental applications. Among the various spinels, cobalt ferrite has attracted a lot of attention due to its remarkable properties such as high coercion field, good mechanical hardness, chemical stability, suitable saturation magnetization (Ms), crystalline magnetism, and high magnetic contraction.
Aim: Investigation of changes in absorption, structural and magnetic properties with simultaneous deposition of chromium and zinc cations in cobalt ferrite and nickel ferrite structure.
Methodology: In this study, structural and magnetic properties of cobalt ferrite and nickel ferrite doped by zinc and chromium (Zn_Cr) , ZnxFe2-xCrxO4Co1-x and ZnxFe2-xCrxO4Ni1-x ( X=0, 0.5, 0.75, 1) have been studied. These materials synthesized by the self-combustion sol-gel method. The iron nitrate, cobalt nitrate, nickel nitrate, zinc nitrate, chromium nitrate, and polyvinyl alcohol were selected as raw materials. The ferrite and nickel nanoparticles were identified by X-ray diffraction (XRD) by Rithold refinement through MAUD program and FTIR spectrum. A vibrating-sample magnetometer (VSM) was used to determine the magnetism of the samples. The saturated magnetism (MS) of the nano-samples that have been evaluated showed that this behavior was related to the distribution of cations in quadrilateral and octagonal holes of spinel structure by injecting Zn_Cr reducing the behavior from 27.02 emu/g to 0.5 emu/g. The evaluated coercive field (HC) reached the maximum value at X=0.5 and then decreased dramatically due to the reduction of crystalline magnetism anisotropy as a result of non-magnetic zinc ion replacement.
Conclusions: It is possible to prepare cobalt ferrite as well as nickel ferrite with Zn_Cr. By replacing Co2+ and Fe3+, the size of nanoparticles increases with the exchange of Zn2+ and Cr3+, with Ni2+ and Fe3+, which can be