Please use this identifier to cite or link to this item:
http://repositorio.ufc.br/handle/riufc/67752| Type: | Artigo de Periódico |
| Title: | Raman and infrared spectra of KNbO3 in niobate glass-ceramics |
| Authors: | Andrade, Joacir Soares de Pinheiro, Alexandre Gonçalves Vasconcelos, Igor Frota de Sasaki, José Marcos Paiva, Jose Airton Cavalcante de Valente, Manuel Almeida Sombra, Antônio Sérgio Bezerra |
| Keywords: | Raman scattering;Niobate glass-ceramics;X-ray diffraction |
| Issue Date: | 1999 |
| Abstract: | Potassium niobophosphate glasses and glass–ceramics of the family [xNb2O5:.50−x/ P2O5:50K2O]:yFe2O3 were studied by x-ray powder diffraction, infrared and Raman scattering spectroscopy. For the potassium–phosphate samples [50P2O5–50K2O] the iron oxide presents a network former behaviour, for 2 mol% of Fe2O3 doping. The precipitation of crystalline K4Nb6O17 and ferroelectric KNbO3 crystals was confirmed by x-ray powder diffraction in the samples with x D 40 and 50 mol% respectively. The infrared and Raman scattering spectroscopy results suggest that the increase of the ratio Nb2O5=P2O5 leads the niobium to sites of octahedral symmetry and consequently to the formation of ferroelectric KNbO3, as seen by x-ray diffraction analysis. |
| URI: | http://www.repositorio.ufc.br/handle/riufc/67752 |
| ISSN: | 1361-648X |
| Appears in Collections: | DEMM - Artigos publicados em revista científica |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 1999_art_jsandrade.pdf | 546,48 kB | Adobe PDF | View/Open |
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