Estudo de cintiladores CdWO4 produzidos por diferentes rotas de síntese

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Costa, Michelle Silveira Vilanova lattes
Orientador(a): Macedo, Zélia Soares
Banca de defesa: Não Informado pela instituição
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
Departamento: Não Informado pela instituição
País: BR
Palavras-chave em Português:
Área do conhecimento CNPq:
Link de acesso: https://ri.ufs.br/handle/riufs/5324
Resumo: This work aimed the production of cadmium tungstate (CdWO4-CWO) using co-precipitation, hydrothermal with heating with microwaves and sol-gel methods, using PVA (polyvinyl alcohol). A mixed route using co-precipitation followed by hydrothermalization was also tested. The comparison between the efficiency of the route to produce single phase, as well as the luminescent output of the samples, was performed. CdWO4 is a scintillator material highly functional due to its chemical and thermal stability and high stopping power for X-rays. This material has been widely used for computer tomography. Through the analysis of the crystal phase of the produced materials, it was verified that the samples presented major phase CdWO4. In some cases, minor phases were also observed, in proportions that depended on the synthesis method employed. Calcination and washing procedures have also influenced the amount of secondary phases in the samples. The best crystallization results were achieved by the co-precipitation route, followed by microwave heating. The luminescent performance of CdWO4 was investigated by photoluminescence measurements. The measurements were performed in emission mode and presented only the intrinsic emission of the material. The sample with the best light output was CWO produced by co-precipitation route.