Síntese e caracterização de CaTiO3 dopado com Tb3+ e Yb3+
Data
2013-07-16
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Universidade Federal de Goiás
Resumo
Crystalline samples of CaTiO3: X with X = Tb or/and Yb were stoichiometrically prepared by the polymeric precursor method. The structure of the doped sample was analyzed by X-ray diffraction measurements. The diffraction pattern showed a single phase perovskite-related type orthorhombic. The X-ray diffraction was used to evaluate order-disorder materials calcined at different temperatures, and to calculate the lattice parameters and crystallite size of the materials. XANES spectra were used to evaluate the local order around the Ti atoms and correlating with pre presence of clusters TiO5-TiO6. The photoluminescent property of the obtained materials was investigated for the powders calcined at different temperatures and observed a greater issue for photoluminescent material heat treated at 500 ° C.
Descrição
Palavras-chave
CaTiO3, Perovsquita, Fotoluminescência, Perovskite, Photoluminescence
Citação
ALVARENGA, L. D. Síntese e caracterização de CaTiO3 dopado com Tb3+ e Yb3+. 2013. 78 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2013.