Oxygen-Vacancy-Related Electrical Properties of 2CaTiO₃–SiO₂Glass

Abstract

We investigated the electrical properties of 2CaTiO 3 -SiO 2 glass in the frequency range of 100 Hz f 15 MHz, and from room temperature to 600 .anomalous, large dielectric response was found and it drastically decreased with increasing heat treatment cycles in air, indicating that anomalous dielectric response was related to oxygen vacancy. We analyzed the electrical data in the framework of the Cole-Cole formalism of permittivity and impedance. The activation energy (E dc = 0.59, E ac = 0.53 ~ 0.54 eV) and stretched exponential parameter ( = 0.59 ~ 0.94), obtained from the Cole-Cole formula, showed that the conductivity was mostly concerned with the ionic hopping process and the weight of interaction between oxygen vacancy and surroundings changed with temperature.