Dielectric Properties Of Reduced Heterogeneous Silica-Titania Glasses

The frequency and temperature dependencies of the dielectric properties of a heterogeneous silica-titania glass by ac impedance spectroscopy measurements in the temperature range 25-700 deg C, and the frequency range 40-10(7) Hz has been studied. The heterogeneous glass was prepared by the controlled heat treatment of a homogeneous SiO2-TiO2 glass, containing ~7.5 wt% TiO2, in a reducing atmosphere to create a microstructure consisting of many discrete particles of the rutile/anatase TiO2 phase dispersed in a homogeneous SiO2-rich glassy matrix.