Optical, Structural and Magnetic Properties of Copper-doped Iron Ferrite Synthesized by a Sol-Gel Method
The samples of CuxFe2-xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) ferrites were synthesized by a sol-gel method. The structural, morphological, optical and magnetic properties of the products were determined and characterized in detail by X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Transmission Scanning Electron Microscopy (TEM), Energy Dispersive X-ray spectroscopy (EDX) and Superconducting Quantum Interferometer Device (SQUID). X-ray analysis showed that all compositions crystallize with a cubic spinel-type structure with an average crystallite size in the range of 11–13 nm. The lattice parameter increased from 8.30 to 8.400 Å with increasing Zn content. The optical properties of the nano-ferrites were investigated by UV–vis spectroscopy and photoluminescence (PL) spectra. UV–vis absorption spectra show that the energy band gap (Eg) of Zn-doped copper ferrite decreases from 3.64 to 3.10 eV when the particle size is increased. The broad visible emission band is observed in the entire PL spectrum. The CuxFe2-xO4 nano-ferrites exhibit super-paramagnetic behavior at room temperature (RT).
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