%0 Journal Article %1 WOS:000080794200017 %A de Andrade, JS %A Pinheiro, AG %A Vasconcelos, IF %A Sasaki, JM %A de Paiva, JAC %A Valente, MA %A Sombra, ASB %C TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND %D 1999 %I IOP PUBLISHING LTD %J JOURNAL OF PHYSICS-CONDENSED MATTER %K imported %N 22 %P 4451-4460 %R 10.1088/0953-8984/11/22/315 %T Raman and infrared spectra of KNbO3 in niobate glass-ceramics %V 11 %X 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 samples 50P(2)O(5)-50K(2)O 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 = 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.

@article{WOS:000080794200017, 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 samples [50P(2)O(5)-50K(2)O] 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 = 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.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND}, author = {de Andrade, JS and Pinheiro, AG and Vasconcelos, IF and Sasaki, JM and de Paiva, JAC and Valente, MA and Sombra, ASB}, biburl = {https://www.bibsonomy.org/bibtex/24ad3e961edff4449b213701acdbf4d70/ppgfis_ufc_br}, doi = {10.1088/0953-8984/11/22/315}, interhash = {e89fb8cfa75c57cc59fbbd9f9fb68f9a}, intrahash = {4ad3e961edff4449b213701acdbf4d70}, issn = {0953-8984}, journal = {JOURNAL OF PHYSICS-CONDENSED MATTER}, keywords = {imported}, number = 22, pages = {4451-4460}, publisher = {IOP PUBLISHING LTD}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Raman and infrared spectra of KNbO3 in niobate glass-ceramics}, tppubtype = {article}, volume = 11, year = 1999 }