MDSC, electrical conductivity and optical absorption studies of 40B 2O 3–20CdO–(40–x)Bi 2O 3–xLi 2O glasses

Abstract

Quaternary glasses with composition 40B 2O 3–20CdO–(40–x)Bi 2O 3–xLi 2O where 0 ≤ x ≤ 40 were prepared by melt quench technique. The density of the glass samples which is evaluated by Archimedes method showed that the density increases with Bi 2O 3 content. The modulated differential scanning calorimetry (MDSC) studies have been done on these samples to evaluate various thermo dynamical parameters. The value of glass transition temperature (T g) decreases with the Li 2O content. The dc electrical conductivity studies revealed that the conductivity in these glass samples increases with Li 2O content, where as the activation energy decreases. Theoretical optical basicity values decreases with Li 2O content. The optical absorption studies revealed that the cutoff wavelength increases while optical band gap energy (E opt) and Urbach energy (Δ E) decreases with increase of Li 2O content. The E opt values of these glasses are found to be in the range 2.848–3.258 eV where as the values of Δ E lies in the range 0.21–0.33 eV.