Dielectric properties of soda-lime silicate glass doped with TiO2

Abstract: A survey of the dielectric properties of TiO2 doped soda-lime silicate is presented. Impedance spectroscopy was used with measurements conducted in a temperature range from 298 K to 623 K and frequencies between 10-2 and 106 Hz. A relaxation peak was observed at high frequency associated with the movement of dipoles and most likely due to the Na+ ions, which is the most mobile specie in the glass. The activation energy of the relaxation was calculated to 0.77-0.91 eV, increasing with reduced Na2O and increased CaO content. The dipole moment was however only influenced by the Na2O content. Neither the activation energy nor the dipole moment showed any significant change by the addition of TiO2. The dipole moment did however increase with increased temperature, following a square root function. Furthermore, the conductivity showed a clear increase as the temperature increased but no significant change with regards to the composition of the glass. No clear signs of electrode polarization nor dc conductivity could be observed which made it difficult to draw any conclusions about the nature of the conduction.