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A Low Temperature Synthesis and Optical Characterization of Mn-Ni Mixed Nanoferrites
Objectives: The presented work investigates the optical properties of Mn-Ni mixed nanoferrites prepared by a low temperature synthesis method. Methods: A series of manganese nickel (Mn-Ni) mixed spinel nanoferrites having chemical formula Mn1-xNixFe2O4 (x = 0.1, 0.2, 0.3, 0.4, 0.5) have been synthesized by a simple chemical co-precipitation method. The spinel phase formation of the prepared nanoferrites was confirmed using x-ray diffraction (XRD). Optical properties were investigated using UV-visible absorption spectroscopy recorded in the range 200 to 900 nm. Using the absorption spectra and Tauc's relation, the band gap was estimated. Findings: The prepared nanoferrites possess narrow band gap. It was observed that concentration of nickel has profound effect on the optical band gap. A remarkable decrease in the optical band gap was observed with increasing nickel concentration revealing the tunability of the optical band gap by compositional variation of the nanoferrites. Application: The prepared magnetic nanoparticles owing to its large surface to volume ratio with tunable narrow band gap may find applications in photocatalysis, dye degradation, waste water treatment technology etc.
Low Temperature Synthesis, Nanoparticles, Optical Band Gap, Spinel Ferrites.
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