Abstract
The microstructure, optical, and magnetic properties of CdxMg0.3-xCu0.2Zn0.5Fe2O4 ferrites prepared by the citrate auto-combustion method were investigated. The samples were analyzed by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, https://soh.iums.ac.ir/uploads/uv-vis_-_2.pptx X-ray energy-dispersive spectroscopy, Fourier-transform infrared spectroscopy, and vibrating sample magnetometer. Rietveld refinement of XRD patterns shows a single-phase cubic structure (space group Fd3¯m) for the samples with x up to 0.20, while the impurity phase of CdO is observed in the samples with x = 0.25, 0.30. As the substitution content increases, the presence of non-magnetic Cd2+ ions in the octahedral site and the migration of Fe3+ions from the octahedral site to the tetrahedral site decreases the saturation magnetization of the samples. Comparison of the bandgap energy of the samples shows an increasing trend with Cd substitution for x up to 0.20 and then decreases, which can be interpreted in terms of changes in the electronic structure of the samples. Improvement in dielectric properties of the samples with increase of Cd2+ content for x up to 0.20 may be attributed to easier transfer and electron exchange between Fe3+and M2+ ions.
Highlights
Magnetism and magnetic materials have attracted enormous interest since the discovery of the phenomenon of giant magnetic resistance (GMR) in multilayer structures
It is observed that the lattice parameter decreases with cadmium content obeying Vegard’s law for x up to 0.15 (Bachhav et al, 2011)
These results demonstrated that the lattice parameter shows dependence on size of particle, decreasing for smaller particles, increasing strainsurface effects (Bachhav et al, 2011)
Summary
Magnetism and magnetic materials have attracted enormous interest since the discovery of the phenomenon of giant magnetic resistance (GMR) in multilayer structures. There is an exception in zinc ferrite (ZnFe2O4) that larger divalent ions tend to occupy the A sites because their electronic arrangements are more suitable for A-site binding to lattice oxygen ions (Gill and Puri, 1985; El-Sayed, 2002; Manikandan et al, 2013b). Studies showed that Mg+2 ions can be substituted on the A and B sites in Mg0.3-xBaxCu0.2Zn0.5Fe3O4, ferrite, but preferably tend to occupy the A sites and, Fe+3 ions are on both the sites (Gholizadeh and Beyranvand, 2020). Studies on Mn0.3xCdxCu0.2Zn0.5Fe3O4 nanoparticles showed that Mn+2 and Fe+3 ions can occupy both the A and B sites (Beyranvand and Gholizadeh, 2020). 10 MHz) using a precision LCR meter (GW Instek 8110G)
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