Estudo do efeito da interação de radiações ionizantes com o sistema vítreo LBA (LiO2 – B2O3 – Al2O3) nanoestruturado com nanocristais de CaF2 e dopado com TiO2 e Ag

Abstract

The glass matrix LBA, with composition 50Li2O.45B2O3.5Al2O3 (mol %), was synthesized with the fusion method, doped and non-doped with one or more of the following composition: CaF2, TiO2 e Ag. Controlling the kinetics of crystallization and studying the X Ray Diffraction (XRD) and Differential Thermal Analysis (DTA). The samples, doped and non-doped, was submitted to heat treatment at 450ºC during 12h. With XRD technique was possible to observe crystal formation, mainly of LiBO2 in the matrix without dope and heat treated, and predominantly crystals of LiF for the others samples heat treated. All the samples were submitted to ionizing radiation with a dose of 10 Gy. Observing the thermoluminescent emission curves we can check that there was release of electron in the trap for some samples, with higher intensity of LBA + 45CaF2 + 5TiO2 with peak in 419ºC. The others samples began the process, but can not be observed because the temperature did not reach thermal energy required to release the electron of the trap.