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

Autor(es)

Lima, A. R. F. ^[1] ; Sczancoski, J. C. ^{[2, 1]} ; Li, M. Siu ^[3] ; Longo, E. ^[2] ; Camargo, E. R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, LIEC, Rod Washington Luis, Km 235, CP 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] UNESP Univ Estadual Paulista, Inst Quim, BR-14801907 Araraquara, SP - Brazil

^[3] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 42, n. 4, p. 4709-4714, MAR 2016.
• Citações Web of Science: 7

Resumo

KSr2Nb5O15 and K(1.2)Sr(1.6)Ln(0.2)Nb(5)O(15) (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. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 12/07067-0 - Fotocatalisadores baseados em titanato de bismuto sintetizadas pelo método dos complexos oxidantes de peróxido (OPM)
• Beneficiário: Emerson Rodrigues de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs