Potassium niobato-phosphate glasses and glass-ceramics

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Potassium niobato-phosphate glasses and glass-ceramics

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

—

Volume of the periodical

572

Issue of the periodical within the volume

November

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

121091

UT code for WoS article

000696310300001

EID of the result in the Scopus database

2-s2.0-85112007454