Structural and optical properties of WO3–PbO–B2O3 glass-ceramic

The WO3–PbO–B2O3 glasses and glass ceramics are prepared and investigated with the help of XRD, density, molar volume, UV–visible and FTIR spectroscopy. XRD pattern reveals the glassy behavior up to 4% concentration of WO3 and ceramic behavior of the prepared samples with concentration of WO3 >4%. Band gap of glass samples decreases with increase in the WO3 concentration from 0–5%. The samples with WO3 concentration >5% do not respond to UV–visible absorption. The density and molar volume measurements show the compaction of structure of the samples, which is due to the formation of BO4 groups. FTIR spectroscopy shows the formation of BO4 group and W–O–W bending vibration at high concentration of WO3.

► X-ray diffraction observed the ceramic behavior of the prepared samples.
► The decrease of optical band gap shows semiconducting behavior.
► FTIR study shows existence of BO3 and BO4 groups with W–O–W vibration of tungsten.