Estudo de vidros metasilicatos de chumbo puro e dopado produzidos via fusão laser

• Ano de defesa: 2018
• Autor(a) principal: Silva, Deyvid do Carmo
• Orientador(a): Silva, Ronaldo Santos da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Física
• Palavras-chave em Português: Materiais vítreos; Silicatos de chumbo; Propriedades estruturais; Propriedades ópticas
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: http://ri.ufs.br/jspui/handle/riufs/10999

For thousand years, vitreous materials have been studied and improved due to its wide range of applications, from the simplest ones like windows and glass cups, to the most advanced ones such as medicine, telecommunications, radiation detectors, among others. The lead silicate glasses, object of study in this work, are well known for their optical applications and its high refractive index due to lead presence. In addition, lead is known to be a heavy metal widely used for high energy radiation protection. In the present work, the production, structural and optical properties of the pure and doped lead silicate glass with europium (Eu) were studied on the PbO-SiO2 system, where the lead was partially substituted by europium. Usually the production of glasses is performed using a furnace for material melting, however in this work is proposed a new glasses production process that has been giving satisfactory results is using a CO2 laser for material melting. It has presented some advantages, such as fast processing speed, very high heating and cooling rates and possibility of producing materials with high melting point. For the production and characterization of glasses, some techniques were used, such as Differential Scanning Calorimetry (DSC), Raman Spectroscopy, X-ray Diffractometry (XRD), UV-Vis Spectroscopy and Photoluminescence. In this work, an efficient routine to glasses production using a CO2 laser as heating source was achieved and the glass optical characterization was performed. Absorbance, gap energy and luminescent emission of the produced glasses were determined.