Influence of Fe2+ substitution on FTIR and Raman spectra of Mn ferrite nanoparticles

The effect of Fe2+ substitution on FTIR and Raman spectra of Mn ferrites (Mn1−xFexFe2O4; x = 0.0, 0.1, 0.2, 0.4, and 0.6) nanoparticles, synthesized using the co-precipitation method, has been studied. The FTIR spectra of the synthesized nanoparticles have high-frequency bands of ∼ 510–530 cm−1 corresponding to the vibrations of tetrahedral sites (ν1) and low-frequency band (ν2) of ∼ 430–460 cm−1 revealing vibrations of octahedral sites. The shifting of wavenumber with Fe2+ substitution revealed the presence of Fe2+ on the octahedral sites. The Raman peaks were obtained at 191 cm−1, 327 cm−1, 573 cm−1, 605 cm−1, and 674 cm−1 for pure Mn ferrite nanoparticles and shifted with Fe2+ substitution showing the presence of Fe2+ at the octahedral sites.