MDSC, electrical conductivity and optical absorption studies of 40B2O3–20CdO–(40–x)Bi2O3–xLi2O glasses

Quaternary glasses with composition 40B2O3–20CdO–(40–x)Bi2O3–xLi2O 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 Bi2O3 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 (Tg) decreases with the Li2O content. The dc electrical conductivity studies revealed that the conductivity in these glass samples increases with Li2O content, where as the activation energy decreases. Theoretical optical basicity values decreases with Li2O content. The optical absorption studies revealed that the cutoff wavelength increases while optical band gap energy (Eopt) and Urbach energy (ΔE) decreases with increase of Li2O content. The Eopt values of these glasses are found to be in the range 2.848–3.258 eV where as the values of ΔE lies in the range 0.21–0.33 eV.

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