Infrared diffuse reflectance spectra of micropowders of Ni$_{1-x}$Zn$_{x}$Fe$_{2}$O$_{4}$ ferrites

The results of experimental studies of the IR diffuse reflectance spectra in the range from 4000 to 50 cm$^{-1}$ of Ni$_{1-x}$Zn$_{x}$Fe$_{2}$O$_{4}$ ferrite micropowders with different concentrations of nickel and zinc are presented. The dependence of the intensity of the IR spectra of these ferrites on the changing concentrations of Fe$^{2+}$ and Fe$^{3+}$ cations in ferrites of different compositions is found. The features of change of the reflectance spectra are studied depending on the ferrite compositions, and an interpretation of the observed spectral structures is proposed.