Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten–bronze structure

KSr2Nb5O15 and K1.2Sr1.6Ln0.2Nb5O15 (Ln=La, Pr, and Nd) were synthesized by the Pechini method and calcined at 1373K for 10h 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. Modificatio...

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Bibliographic Details
Published in:Ceramics international 2016-03, Vol.42 (4), p.4709-4714
Main Authors: Lima, A.R.F., Sczancoski, J.C., Siu Li, M., Longo, E., Camargo, E.R.
Format: Article
Language:English
Subjects:
C. Optical properties
Ceramics
Crystal structure
Optical materials
X-ray diffraction
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Summary:KSr2Nb5O15 and K1.2Sr1.6Ln0.2Nb5O15 (Ln=La, Pr, and Nd) were synthesized by the Pechini method and calcined at 1373K for 10h 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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.11.130