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

摘要

This study continues our investigations on non-traditional tellurite-selenite amorphous materials. Two glasses containing TeO_2, SeO_2, MoO_3 and V_2O_5 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 ℃. Both glasses were subjected to heat treatment (300 ℃ -12 h) and as a result no crystallization was observed. The main building units (TeO_3, TeO_4, Mo_2O_8, and SeO_3) 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 elasses are transparent above 550 nm and thev were red colored.