Influence of modifier on dielectric and ferroelectric properties of aluminosilicate glasses

Abstract Glasses with compositions SiO 2 -CaO-Al 2 O 3 -TiO 2 -Na 2 O were prepared by conventional melt quench technique. The dielectric properties of these glasses with a variation in alkali content over a frequency range from 20 Hz to 1 MHz and temperature variation of 30–280 °C have been investigated. The electric modulus representation has been used to provide comparative analysis of the ion transport properties in these glasses. The conductivity isotherms show a transition from frequency independent dc region to dispersive region where the conductivity continuously increases with increasing frequency. The present glasses exhibit conductivity in the range of 10 − 5 to 10 − 3 S/m which is higher than the alkali containing silicate glasses. Hysteresis loop observed at room temperature confirms the ferroelectric nature of glasses.