Synthesis, characterization and optical properties of non-traditional tellurite-selenite glasses

This study continues our investigations on non-traditional tellurite-selenite amorphous materials. Two glasses containing TeO2, SeO2, MoO3 and V2O5 were obtained at high oxygen pressure (P = 36 MPa) using pure oxides as precursors. The real bulk chemical composition of both glasses was verified by LA-ICP-MS method. The glasses were characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Differential Thermal Analysis (DTA), UV-Vis, XPS, IR and EPR spectroscopy. According to DTA the glass transition temperature (T-g) is below 300 degrees C. Both glasses were subjected to heat treatment (300 degrees C - 12 h) and as a result no crystallization was observed. The main building units (TeO3, TeO4, Mo2O8, and SeO3) were determined by IR and X-ray photoelectron spectroscopy and the existence of mixed bridging bonds only, which build up the amorphous network. It was established by UV-Vis that the obtained glasses are transparent above 550 nm and they were red colored. (C) 2014 Elsevier B.V. All rights reserved.