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Abstract
This study aims to investigate the structural and optical properties of copper-doped zinc ferrites (ZnFe2O4:Cu) by employing X-ray diffraction (XRD), UV-Vis spectroscopy, Raman spectroscopy, and Fourier Transform Spectroscopy (FTIR) techniques. Using the solid-state reaction technique, a series CuxZn1-xFe2O4 of samples with x = 0, 0.25, 0.5, 0.75, 1 were created. X-ray analysis verified the production of a single-phase cubic spinel structure for all concentrations. The X-ray diffraction pattern of copper ferrite showed a pure spinel structure with Jahn-Teller tetragonal distortion. According to Rietveld refinement, the CuxZn1-xFe2O4 with all x concentrations corresponds to the usual spinel structure. As the concentration of copper increased, the crystal size decreased except for Cu0.5Zn0.5Fe2O4, which was high compared to all. The lattice parameters and the X-ray density varied. Copper-doped zinc ferrites have band gaps increased from 1.825 eV to 2.776eV. Infrared and Raman spectroscopy also confirmed the spinel phase formation in the samples. The deconvoluted Raman spectra were used to compute the locations of five Raman modes as well as intensity variations. The cationic arrangement in A and B sites was inferred using deconvoluted Raman peaks. The crystal structure is more visible in Raman spectra than in XRD at room temperature. FT-IR analysis validated the spinel structure, revealing absorption bands at 630-540 cm-1 and 525-390 cm-1 for higher and lower frequencies, respectively. Copper doping is expected to influence zinc ferrites' crystallographic structure and optical behavior, potentially enhancing their applications in various technological fields.
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