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

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2-s2.0-84955667748.pdf (1.32 MB)

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2016-03-01

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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.

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C. Optical properties, Ceramics, Crystal structure, Optical materials, X-ray diffraction

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Inglês

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Ceramics International, v. 42, n. 4, p. 4709-4714, 2016.

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http://hdl.handle.net/11449/177745

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Artigos - Bioquímica e Tecnologia - IQ