Potassium niobato-phosphate glasses and glass-ceramics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F21%3A39917661" target="_blank" >RIV/00216275:25310/21:39917661 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0022309321004506?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0022309321004506?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2021.121091" target="_blank" >10.1016/j.jnoncrysol.2021.121091</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Potassium niobato-phosphate glasses and glass-ceramics

Popis výsledku v původním jazyce

Glasses of the ternary system K2O-Nb2O5-P2O5 were studied in three compositional series (60-x)K2O-xNb2O540P2O5 (series A) with 10-40 mol% Nb2O5, 40K2O-yNb2O5-(60-y)P2O5 (series B) with 10-30 mol% Nb2O5 and zK2O-20Nb2O5-(80-z)P2O5 (series C) with 20-50 mol% K2O. The basic physical parameters of glasses were also determined. Almost all the glasses were colourless, only two glasses with a higher Nb2O5 content were blue coloured due to the presence of a small amount of Nb4+ ions. The glass transition temperature in the series A and B increases with increasing Nb2O5 content, whereas in series C it increases only slightly. The highest value of 757 degrees C was found for the glass 20K2O-40Nb2O5-40P2O5 from the A series. The refraction index only increases significantly in the glasses of the series A and B with increasing Nb2O5 content; glass 20K2O-40Nb2O5-40P2O5 from the series A had the highest value of 1.809 at 587.6 nm. The glass structure was evaluated from an analysis of their 31P MAS NMR and Raman spectra. The efficiency of Raman scattering by NbO6 units is higher than that of PO4 units, which results in the suppression of phosphate vibrational bands in the Raman spectra of glasses with a higher Nb2O5 content. In the glasses with 30-40 mol% Nb2O5, Raman spectra showed on the formation of chains Nb-O-Nb interconnecting NbO6 octahedra and even on the formation of 3D niobate clusters. Samples containing less than 30 mol% P2O5 revealed a tendency to form glass-crystalline materials containing potassium niobate crystals. Their crystalline structure was not identified, but according to their Raman spectra, they contain NbO6 octahedra similar to those in KNbO3.

Název v anglickém jazyce

Potassium niobato-phosphate glasses and glass-ceramics

Popis výsledku anglicky

Glasses of the ternary system K2O-Nb2O5-P2O5 were studied in three compositional series (60-x)K2O-xNb2O540P2O5 (series A) with 10-40 mol% Nb2O5, 40K2O-yNb2O5-(60-y)P2O5 (series B) with 10-30 mol% Nb2O5 and zK2O-20Nb2O5-(80-z)P2O5 (series C) with 20-50 mol% K2O. The basic physical parameters of glasses were also determined. Almost all the glasses were colourless, only two glasses with a higher Nb2O5 content were blue coloured due to the presence of a small amount of Nb4+ ions. The glass transition temperature in the series A and B increases with increasing Nb2O5 content, whereas in series C it increases only slightly. The highest value of 757 degrees C was found for the glass 20K2O-40Nb2O5-40P2O5 from the A series. The refraction index only increases significantly in the glasses of the series A and B with increasing Nb2O5 content; glass 20K2O-40Nb2O5-40P2O5 from the series A had the highest value of 1.809 at 587.6 nm. The glass structure was evaluated from an analysis of their 31P MAS NMR and Raman spectra. The efficiency of Raman scattering by NbO6 units is higher than that of PO4 units, which results in the suppression of phosphate vibrational bands in the Raman spectra of glasses with a higher Nb2O5 content. In the glasses with 30-40 mol% Nb2O5, Raman spectra showed on the formation of chains Nb-O-Nb interconnecting NbO6 octahedra and even on the formation of 3D niobate clusters. Samples containing less than 30 mol% P2O5 revealed a tendency to form glass-crystalline materials containing potassium niobate crystals. Their crystalline structure was not identified, but according to their Raman spectra, they contain NbO6 octahedra similar to those in KNbO3.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

—

Svazek periodika

572

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

121091

Kód UT WoS článku

000696310300001

EID výsledku v databázi Scopus

2-s2.0-85112007454