Evaluations of Sb20Se80-xGex (x = 10, 15, 20, and 25) Glass Stability from Thermal, Structural and Optical Properties for IR Lens Application

Abstract

Chalcogenide glasses have been investigated in their thermodynamic, structural, and optical properties for application in various opto-electronic devices. In this study, the Sb 2 0 Se 8 0-x Ge x with x = 10, 15, 20, and 25 were selected to investigate the glass stability according to germanium ratios. The thermal, structural, and optical properties of these glasses were measured by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and UV-Vis-IR Spectrophotometry, respectively. The DSC results revealed that Ge 2 0 Sb 2 0 Se 6 0 composition showing the best glass stability theoretically results due to a lower glass transition activation energy of 230 kJ/mol and higher crystallization activation energy of 260 kJ/mol. The structural and optical analyses of annealed thin films were carried out. The XRD analysis reveals obvious results associated with glass stabilities. The values of slope U, derived from optical analysis, offered information on the atomic and electronic configuration in Urbach tails, associated with the glass stability.

Effect of B2O3 addition on thermal and optical properties of TeO2–ZnO–Bi2O3–TiO2 glasses

“…Its value then decreases as the B 2 O 3 concentration is increased, opposite to the way the energy band gap (E gap ) change as B 2 O 3 concentration is increased. These two results (increasing band gap and decreasing Urbach energy) suggest that adding B 2 O 3 into the glass creates a more compact network and the glass structure becomes less disordered [57]. This result is consistent to the finding that the BO/NBO ratio increases with the increase of B 2 O 3 concentration.…”