Effect of Stepwise Replacement of LiF by Bi₂O₃ and of Annealing on Optical Properties of LiF⋅B₂O₃ Glasses

Abstract

Bismuth fluoroborate glasses with compositions xBi 2 O 3 · (40 − x)LiF · 60 B 2 O 3 (x = 0, 5, 10, 15, and 20) are synthesized by meltquench method. Optical characterization was carried out to examine variation of optical band gap energy (E g ) and Urbach energy (E U ) with respect to the concentration. It reflects the effect of stepwise replacement of non-oxide and less polarizable LiF by an oxide and more polarizable (Bi 2 O 3 ) group on the optical properties of the samples. The value of E g decreases with increase in concentration of Bi 2 O 3 . The samples were subjected to annealing at different temperatures (300• C, 350• C, and 400• C), and the effect of annealing on the optical properties of various samples was again studied. Annealing affects remarkably the values of E g and E U in the samples with x = 0.

DSC and DC Conductivity of Bi2O3 · LiF · B2O3 Glasses

“…LiF-B 2 O 3 glasses doped with rare earth ions are used as efficient lasing materials [1]. When alkali halides are introduced into the glass structure, they exhibit their presence by changing the glass structure [2][3][4][5], which is observed with the help of a number of experimental techniques. Differential scanning calorimetry (DSC) is an important technique to study the glass forming ability of a melt which in turn depends on the cooling rate.…”

Effect of stepwise replacement of LiF by ZnO on structural and optical ptroperties of LiF.B2O3 glasses

“…The flexible variance in the structures of borate glasses with the addition of LiF has been reported [2]. We have recently reported the study of LiF.B 2 O 3 glasses with concentrations varied by replacing LiF by Bi 2 O 3 [3,4]. ZnO, being a transition metal oxide, exhibits semiconducting properties.…”