Raman and infrared spectra of KNbO3 in niobate glass-ceramics

Citation
Js. De Andrade et al., Raman and infrared spectra of KNbO3 in niobate glass-ceramics, J PHYS-COND, 11(22), 1999, pp. 4451-4460
Citations number
28
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
11
Issue
22
Year of publication
1999
Pages
4451 - 4460
Database
ISI
SICI code
0953-8984(19990607)11:22<4451:RAISOK>2.0.ZU;2-F
Abstract
Potassium niobophosphate glasses and glass-ceramics of the family [xNb(2)O( 5).(50-x)P2O5. 50K(2)O]:yFe(2)O(3) were studied by x-ray powder diffraction , infrared and Raman scattering spectroscopy. For the potassium-phosphate s amples [50P(2)O(5)-50K(2)O] the iron oxide presents a network former behavi our, 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 = 40 and 50 mol% respectively. The infrared and Raman scattering spectroscopy results suggest that the increase of the ratio Nb2 O5/P2O5 leads the niobium to sites of octahedral symmetry and consequently to the formation of ferroelectric KNbO3, as seen by x-ray diffraction analy sis.