Síntese via sol gel proteico e caracterização estrutural e óptica do CaAl2O4:Eu3+, CaAl2O4:Ce3+, CaAl2O4:Eu3+;Dy3+

• Ano de defesa: 2013
• Autor(a) principal: Gomes, Manassés Almeida
• Orientador(a): Valério, Mário Ernesto Giroldo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Sergipe
• Programa de Pós-Graduação: Pós-Graduação em Física
• País: Brasil
• Palavras-chave em Português: Aluminato de cálcio dopado; Sol gel proteico
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://ri.ufs.br/handle/riufs/5367

In this work were studied the optical and structural properties of the calcium aluminate in the stoichiometry 1:2:4 (CaAl2O4) doped with rare earths (RE = Ce, Eu, EuDy). The material was produced via the Sol-Gel Proteic Method that is so known because of its capacity of producing nanosized particles. The structural characterization of the samples was performed by Differential Thermic and Thermogravimetric Analysis (DTA/TG), Scattering electron microscopy (SEM), X-ray diffraction (XRD), where the last one reveals the formation of the single phase of CaAl2O4 calcined at 1200ºC for 2 hours. The study of the optical properties this material has started from 4f-4f and 5d-4f transitions identification, related to the rare earths, through the Photoluminescence (PL) and Radioluminescence (RL) techniques. The Absorption of ionizing radiation, the conversion of radiation into visible light, important factors in the properties that define the application of a material, it was studied by X-Ray Excited Optical Luminescence (XEOL) and Optical Absorption (AO) techniques. The results obtained with these techniques together X-ray Absorption Spectroscopy (XAS) analysis possible a broad understanding of the properties of material.