Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten-bronze structure
Carregando...
Arquivos
Data
2016-03-01
Autores
Lima, A. R.F.
Sczancoski, J. C. [UNESP]
Siu Li, M.
Longo, E. [UNESP]
Camargo, E. R.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
KSr2Nb5O15 and K1.2Sr1.6Ln0.2Nb5O15 (Ln=La, Pr, and Nd) were synthesized by the Pechini method and calcined at 1373 K for 10 h under air atmosphere. Rietveld refinements indicated the presence of structural defects in both KSN and KSN-Ln, especially distortions in O-Nb-O and Nb-O-Nb bonds. Modifications in bond distances of [NbO6] clusters were also confirmed by Raman spectroscopy. Ultraviolet-visible absorption spectra and photoluminescence profiles were influenced by lanthanide atoms in the band structure of modified KSN materials, creating new defects and intermediary energy levels within the band gap.
Descrição
Palavras-chave
C. Optical properties, Ceramics, Crystal structure, Optical materials, X-ray diffraction
Como citar
Ceramics International, v. 42, n. 4, p. 4709-4714, 2016.