Effect of La2O3 addition on structural and electrical properties of sodium borosilicate glasses

Sodium borosilicate glasses doped with lanthanum oxide were prepared using conventional melt quench technique. The XRD study of the glasses were carried out to affirm the amorphous nature of glass. The glass transition temperature T-g and crystallization temperature T-c were determined from the DTA. It is observed that T-g increases with the addition of La2O3. This increase in T-g is supported by density results.. The conductivity of the prepared glasses were studied using impedance analyzer in the frequency interval 20 MHz-2 mHz and in the wide temperature range 423 K-673 K. The obtained data has been correlated with various other parameters like density, molar volume and glass transition temperature. Modulus formalism is introduced to study relaxation behavior of these glasses. The overlapping of data on single master curve indicates that conduction mechanism in these glasses is compositional dependent and temperature independent. There is a good correlation between physical and electrical properties.