OPTICAL AND STRUCTURAL PROPERTIES OF PbO-B2O3-TeO2 GLASSES

Abstract

Optical and structural properties of [TeO₂]_y [(B₂O₃)_1-x (PbO)_x]_1-y glasses of different composition have been studied using UV-Vis, Raman and XRD spectroscopic techniques. The UV optical absorption was recorded at room temperature in the wavelength range of 200 to 800 nm, while the XRD patterns of as-received samples was verified at 2θ = (5 - 80 deg). Eventually, values of the optical energy gap are calculated and found to be dependent on the glass composition. Furthermore, the XRD diffractograms exhibit a wide smooth halo, which is a fingerprint of amorphous materials and some strong narrow diffraction lines corresponding to crystalline of α TeO₂. The Raman spectroscopy measurement shows strong existence of Pb group, O-B O bending and O-Te-O stretching in lattice vibrations.