Dielectric function and optical conductivity of TiO_x (0.8 < x < 1.3) determined from electron energy-loss spectroscopy

Abstract

Reflection electron energy-loss spectra are reported for the family of compounds TiO_x over the entire homogeneity range (0.8 < x < 1.3). The spectra exhibit a plasmon feature on the low-energy side, while several interband transitions are prominent at higher energies. The real and imaginary parts of dielectric functions and optical conductivity for these compounds are determined using the Kramers-Kronig analysis. The results exhibit systematic behavior with varying oxygen stoichiometry.