Structural XANES characterization of Ca0.99Sm0.01TiO3 perovskite and correlation with photoluminescence emission
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2012-08-20
Autores
de Figueiredo, A. T.
Longo, V. M. [UNESP]
da Silva, R. O. [UNESP]
Mastelaro, V. R.
Mesquita, A.
Franco, R. W. A.
Varela, José Arana [UNESP]
Longo, Elson [UNESP]
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Elsevier B.V.
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In this work, CaTiO3:Sm (CT:Sm) were prepared by a soft chemical processing at different annealing temperatures starting with a disordered structure and reaching an ordered one, with the propose to understand the relationship between structural order-disorder and photoluminescence emission. The samples were characterized by titanium K-edge, Titanium L-II and L-III-edge XANES, electron paramagnetic resonance (EPR) and photoluminescence (PL) measurements. XANES results clearly point the presence of local distortion in [TiO6] octahedral clusters until the crystallization was completed. The interactions of the network clusters that form the CT:Sm structures provides favorable structural and electronic conditions for the appearance of PL phenomena. (C) 2012 Published by Elsevier B.V.
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Chemical Physics Letters. Amsterdam: Elsevier B.V., v. 544, p. 43-48, 2012.