Caracterização estrutural e espectroscópica de vitrocerâmicos baseados em vidros teluretos dopados com íons de érbio

Abstract

This work presents a study about the spectroscopic and structural characterization of glassceramics based on a telluride glass doped with ions Er+3, which presents the following molar composition 99,9% (70TeO2-15TiO2 -15BaO) - 0,1% (Er2O3). These materials were obtained submitting the original vitreous matrix to thermal treatments, which were performed by two different procedures. In the first method, a single step thermal treatment was performed, using different time periods (10h30min, 16h, 20h, 40h e 70h), but at the same temperature, 410°C. For the second method, the thermal treatments were performed in two stages of different temperatures. In this case, firstly the material is heated at 410°C for one hour. Then, the material is submitted at 430°C for different periods of time (1h, 3h,5h e 10h). The glassceramics structural characterization was performed using x-ray diffraction (powder method). From these results, we identified crystalline phases related to TeO2, BaTeO3, TiO e BaTiO3, mainly the latter. Also, we perform measurements of optical absorption spectroscopy. From the measured spectra, we obtained the experimental oscillator strengths associated to the erbium íons transitions and calculated the Judd-Ofelt intensity parameters. The obtained results suggest that this kind of glass-ceramic presents an excellent potential for the development of photonic applications based on luminescent emission.