Structural XANES characterization of Ca0.99Sm0.01TiO3 perovskite and correlation with photoluminescence emission
Abstract In this work, CaTiO 3 :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 [TiO 6 ] 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.