Abstract
As-synthesized Fe2+CrxFe(2−x)O4 nanoferrites, 0.0≤x≤1, were prepared by the wet-chemical co-precipitation route and characterized by the X-ray diffraction, Brunauer-Emmett-Teller and transmission electron microscopy, IR spectra, thermographometry and vibrating sample magnetometry (VSM) techniques. This study proved that these samples have single phase of cubic spinel structure in nano-metric scale and are ferrimagnetic materials. VSM measurements revealed that these nanoferrites are soft ferrimagnetic materials. The crystallite size R, porosity P, strain ε, Debye temperature, nanoparticle specific surface area, B-site force constant, elastic parameters and sheer and longitudinal velocities were increased with increasing the Cr3+ ion content x, whereas the lattice constant, density, grain specific surface area and A-site force constant were decreased. The strain ε proved dependence on P and R. Six absorption bands were observed in IR spectra and assigned to their corresponding sites and bonds. Thermal analysis of the samples displayed three steps of combustion process where the net loss of weight ranged 19%–33%. The saturation magnetization MS of the samples was decreased against x, whereas the coercivity HC was increased. Two peaks at 710 and 723eV appeared in XPS spectra and attributed to Fe 2p3/2 and Fe 2p1/2. They reveal that the ratio of Fe2+ to Fe3+ ions increases with Cr ion increment.
Published Version
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