Author/Authors :
F.V. Motta، نويسنده , , A.T. de Figueiredo، نويسنده , , V.M. Longo، نويسنده , , V.R. Mastelaro، نويسنده , , A.Z. Freitas، نويسنده , , L. Gomes، نويسنده , , N.D. Vieira Jr.، نويسنده , , E. Longo، نويسنده , , J.A. Varela، نويسنده ,
Abstract :
The photoluminescence (PL) emission in structurally disordered Ba0.8Ca0.2TiO3 (BCT20) powders was observed at room temperature with laser excitation at lines 355 and 460 nm. The structural evolution perovskite-like titanate BCT20 powders prepared by a soft chemical processing at different annealing temperatures were accompanied by X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES). Intermediate oxycarbonate phase was identified and your influence with PL emission was discarding. BCT20 annealed at 500 °C displays intense PL emission. The results indicate relationship between broad PL band and order–disorder degree.
Keywords :
Amorphous semiconductors , titanates , Photoluminescence , Order–disorder , BCT
