DIELECTRIC FUNCTION AND OPTICAL CONDUCTIVITY OF TIOX (0.8-LESS-THAN-X-LESS-THAN-1.3) DETERMINED FROM ELECTRON-ENERGY-LOSS SPECTROSCOPY

Reflection electron energy-loss spectra are reported for the family of compounds TiOx over the entire homogeneity range (0.8 < a: < 1.3). Th e spectra exhibit a plasmon feature on the low-energy side, while seve ral interband transitions are prominent at higher energies. The real a nd imaginary parts of dielectric functions and optical conductivity fo r these compounds are determined using the Kramers-Kronig analysis. Th e results exhibit systematic behavior with varying oxygen stoichiometr y.