Infrared diffuse reflectance spectra of micropowders of Ni1–x Zn x Fe2O4 ferrites

Raman spectra of Ni1‐XZnXFe2O4 nanopowders

“…We note that experimentally visible additional lines are well interpreted within the theoretical model discussed in paper. [30] Spectral band nearby 76 cm −1 observed in IR spectra of Ni 1-x Zn x Fe 2 O 4 ferrite nanopowders of all compositions [9] is also registered in their Raman spectra. As the selection rules do not enable F 1u type symmetry oscillations in IR and Raman spectra to be observed, it is obvious that the nature of the given spectral band is different from discussed ones.…”

“…In Mössbauer investigations of these ferrites, very weak magnetic component corresponding to the weakly magnetic phase was detected, parameters that could not be determined due to low intensity of the corresponding maxima, and it is impossible to separate them from the intense maxima of Fe cations of A and B sublattices. The diffuse reflectance spectra of different compositions Ni 1‐x Zn x Fe 2 O 4 nanopowders with a grain size of ~20 nm were observed maxima, and the positions of which depended on the relations Fe 2+ /Fe 3+ and Ni 2+ /Ni +3 cations.…”