Estudo de vidros fosfatos dopados com terras raras para aplicações tecnológicas

Abstract

The interest in alkaline earth phosphate glasses resulted from its high transparency to ultraviolet (UV) light, again when compared to silicate glasses. However, the low chemical durability of these first optical glasses limited their applications and (temporarily) discouraged their further development. Recently, the development of new alkaline earth phosphate glasses is applied in several technologies, such as solid state lasers, low temperature sealing glasses, dosimetry, optical fibers and among others. All of these applications have led to renewed interest in understanding the tetrahedral structural arrangement of these compounds. This work describes the vibrational spectroscopic characterization of a phosphate-based matrix with alkaline earth increments and rare earth dopants. To improve structural, thermal and optical properties, as well as the development of optical fibers for sensor, telecommunications and other applications. 1.0 mol% of germanium oxide was added as various modifying oxides (alkaline and alkaline earth). Different rare earth dopants, Erbium, Iterium and Neodymium were also added, in varying concentrations, 8 samples were synthesized, Base (Phosphogermanate), 0.5mol% Er, 0.5mol% Yb, 0.1mol% Nd, 0.2mol% Nd, 0.3mol% Nd, 0.3mol % Nd, 1.0 mol% Nd and 2.0 mol% Nd. Promising results were found for use in dosimetry and in optical fibers, including results for the parameters of the Judd - Ofelt theory, which relates several internal characteristics of the samples.