Electronic Structure of Strontium Titanate

The spectra of three sets of optical functions for SrTiO3 crystals are determined in a broad energy range of fundamental absorption. The calculations are carried out using the experimental reflectivity spectrum in the range 1-35 eV and two theoretical permittivity spectra in the ranges 0-30 eV and 0-14 eV. The special features of these spectra have been determined. The theoretical spectra of the optical functions are compared with the spectra determined using the experimental reflectivity spectrum.