Characterization and structural investigation of lead borophosphate glasses modified by tungsten oxide
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39901572" target="_blank" >RIV/00216275:25310/16:39901572 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1016/j.jallcom.2015.10.229" target="_blank" >http://dx.doi.org/10.1016/j.jallcom.2015.10.229</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jallcom.2015.10.229" target="_blank" >10.1016/j.jallcom.2015.10.229</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Characterization and structural investigation of lead borophosphate glasses modified by tungsten oxide
Popis výsledku v původním jazyce
The effect of WO3 on the properties and structure of PbO-B2O3-P2O5-WO3 quaternary system was studied. Glasses containing up to 60 mol% WO3 were prepared and the variation of several physical properties was determined with respect to chemical composition in a broad compositional range. Chemical durability of WO3-containing glasses is very high and their thermal stability as well. Glass transition temperature increases with increasing WO3 content up to 566oC. Glass structure was studied by Raman spectroscopy and 31P and 11B MAS NMR spectroscopy. NMR spectroscopy reveals the formation of B-O-W linkages and also the existence of tetrahedral BO4 units and trigonal units BO3 in the glass structure. With increasing WO3 content in the glasses, the number of starting tetrahedral B(OP)3O units decreases and B-O-P bridges are replaced gradually by B-O-W and B-O-B bridges, while the number of BO3 units increases. Raman spectra of the studied glasses possess a doublet of strong vibrational bands in the range at 800-1000 cm-1, assigned to vibrations of W-O- a W=O bonds in tungstate structural units. In glasses with a higher WO3 content WO6 octahedra form tungstate clusters interconnected by W-O-W bridges as reflected in the Raman spectra.. The formation of strong P-O-W and B-O-W linkages in the studied glasses explains high chemical durability of the glasses and the observed increase in the glass transition temperature.
Název v anglickém jazyce
Characterization and structural investigation of lead borophosphate glasses modified by tungsten oxide
Popis výsledku anglicky
The effect of WO3 on the properties and structure of PbO-B2O3-P2O5-WO3 quaternary system was studied. Glasses containing up to 60 mol% WO3 were prepared and the variation of several physical properties was determined with respect to chemical composition in a broad compositional range. Chemical durability of WO3-containing glasses is very high and their thermal stability as well. Glass transition temperature increases with increasing WO3 content up to 566oC. Glass structure was studied by Raman spectroscopy and 31P and 11B MAS NMR spectroscopy. NMR spectroscopy reveals the formation of B-O-W linkages and also the existence of tetrahedral BO4 units and trigonal units BO3 in the glass structure. With increasing WO3 content in the glasses, the number of starting tetrahedral B(OP)3O units decreases and B-O-P bridges are replaced gradually by B-O-W and B-O-B bridges, while the number of BO3 units increases. Raman spectra of the studied glasses possess a doublet of strong vibrational bands in the range at 800-1000 cm-1, assigned to vibrations of W-O- a W=O bonds in tungstate structural units. In glasses with a higher WO3 content WO6 octahedra form tungstate clusters interconnected by W-O-W bridges as reflected in the Raman spectra.. The formation of strong P-O-W and B-O-W linkages in the studied glasses explains high chemical durability of the glasses and the observed increase in the glass transition temperature.
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
JH - Keramika, žáruvzdorné materiály a skla
OECD FORD obor
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Návaznosti výsledku
Projekt
<a href="/cs/project/GA13-00355S" target="_blank" >GA13-00355S: Vícesložková fosforečnanová a borofosforečnanová skla</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2016
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Alloys and Compounds
ISSN
0925-8388
e-ISSN
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Svazek periodika
658
Číslo periodika v rámci svazku
February
Stát vydavatele periodika
CH - Švýcarská konfederace
Počet stran výsledku
8
Strana od-do
377-384
Kód UT WoS článku
000366940100049
EID výsledku v databázi Scopus
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