Author/Authors :
de Figueiredo، نويسنده , , A.T. and Longo، نويسنده , , V.M. and da Silva، نويسنده , , R.O. and Mastelaro، نويسنده , , V.R. and Mesquita، نويسنده , , A. and Franco، نويسنده , , R.W.A. and Varela، نويسنده , , J.A. and Longo، نويسنده , , E.، نويسنده ,
Abstract :
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 LII and LIII-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.
