Polarization-dependent reflectivity and optical constants ofTi2O3in the range 0.7-10 eV

Abstract

In order to gain further information concerning the nature of the $d$ electrons in ${\mathrm{Ti}}_2$ ${\mathrm{O}}_3$ we have measured the polarization-dependent reflectivity and evaluated the optical constants in the range 0.7-10 eV. The $d$-electron homopolar bonding between cation pairs plays a crucial role in the semiconductor-to-metal transition observed in this material at about 400°K. Comparison is made with recent joint-density-of-states calculations and good agreement is found thus enabling an assignment of the $d$-electron interband transitions to be made.