Influence of modifier on dielectric and ferroelectric properties of aluminosilicate glasses

Glasses with compositions SiO2-CaO-Al2O3-TiO2-Na2O 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.