Abstract
New bismuth boro-tellurite glass within the compositions 20Bi2O3–25B2O3–(55–x) TeO2–x TiO2 (0≤x≤10mol%) have been prepared by normal melt quenching technique. The structure of the glass and then the glass-ceramic was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and the transmission electron microscopy (TEM). The differential scanning calorimetry (DSC) measurements were carried out on the prepared glass samples to estimate their thermal behavior. Selected glass samples were heat treated at different annealing temperatures and times above the glass transition temperature. The optical absorption spectra were measured in the spectral range (380–600nm) at room temperature. The Fourier transform infrared (FTIR) absorption spectra of all glasses were in the range (350–4000cm−1) have been recorded and designated.
Increasing of TiO2 content changes the direct, indirect band gap and the thermal properties of Bi2O3–B2O3–TeO2–TiO2 glasses. [Display omitted]
•Bi2O3–B2O3–TeO2–TiO2 glasses with different TiO2 (mol%) were successfully prepared.•The direct and indirect band gaps were sensitive to increasing TiO2 content.•The fundamental absorption edge (λcutoff) behavior changed with TiO2.•IR spectra analysis proved the formation of non-bridging oxygen's (NBO's) with TiO2.•Crystallization was confirmed by using XRD and TEM measurements.