Structural investigation of BaO-B2O3-P2O5 glasses by NMR and Raman spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39901582" target="_blank" >RIV/00216275:25310/16:39901582 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.molstruc.2016.04.066" target="_blank" >http://dx.doi.org/10.1016/j.molstruc.2016.04.066</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.molstruc.2016.04.066" target="_blank" >10.1016/j.molstruc.2016.04.066</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structural investigation of BaO-B2O3-P2O5 glasses by NMR and Raman spectroscopy

Popis výsledku v původním jazyce

Glasses of the ternary system BaO-B2O3-P2O5 were prepared and studied in broad concentration limits covering the whole vitrification domain: 20-50 mol% BaO, 0-40 mol% B2O3 and 20-60 mol% P2O5. Their structure was studied with combinations of Raman spectroscopy, P-31 MAS NMR spectroscopy and B-11 MAS NMR spectroscopy. The obtained results are discussed in several compositional lines A: (100-x) Ba(PO3)(2)-xB(2)O(3), B: 40BaO-yB2O3-(60-y)P2O5, C: (50-z)BaO-zB2O3-50P(2)O(5), D: (60-w)BaO-w-B2O3-40P(2)O(5) and E: uBaO-40B2O3-(60-u)P2O5. Boron oxide incorporates into the phosphate network in the form of BO4 and BO3 groups and increases their glass transition temperature. Nevertheless, the increase in T-g is only steep within the region of 0-20 mol% B2O3 reaching a maximum at the glasses with similar to 30 mol% B2O3. In the lines A, B and E a decrease in the P2O5 and an increase of B2O3 content results in the shortening of phosphate chains with decreasing P2O5 content; these changes are most pronounced in line B with a constant BaO content. In lines C and D with a constant P2O5 content a decrease in the BaO content results, in contrast, in the reverse transformation of phosphate structural units in the direction Q(1) -> Q(2) -> Q(3) as detected from Raman spectra and P-31 MAS NMR spectra. B-11 MAS NMR spectra revealed that only BO4 units are present in the glasses with 0-20 mol% B2O3. In the glasses of the E series the fraction of BO3 units increases with a decreasing P2O5 content. By the decomposition of the 11B MAS NMR spectra it is possible to estimate the fractions of basic structural units formed by boron - B(OP)(3)O, B(OP)(2)O-2 and BO3 in all the glasses of the glass forming region.

Název v anglickém jazyce

Structural investigation of BaO-B2O3-P2O5 glasses by NMR and Raman spectroscopy

Popis výsledku anglicky

Glasses of the ternary system BaO-B2O3-P2O5 were prepared and studied in broad concentration limits covering the whole vitrification domain: 20-50 mol% BaO, 0-40 mol% B2O3 and 20-60 mol% P2O5. Their structure was studied with combinations of Raman spectroscopy, P-31 MAS NMR spectroscopy and B-11 MAS NMR spectroscopy. The obtained results are discussed in several compositional lines A: (100-x) Ba(PO3)(2)-xB(2)O(3), B: 40BaO-yB2O3-(60-y)P2O5, C: (50-z)BaO-zB2O3-50P(2)O(5), D: (60-w)BaO-w-B2O3-40P(2)O(5) and E: uBaO-40B2O3-(60-u)P2O5. Boron oxide incorporates into the phosphate network in the form of BO4 and BO3 groups and increases their glass transition temperature. Nevertheless, the increase in T-g is only steep within the region of 0-20 mol% B2O3 reaching a maximum at the glasses with similar to 30 mol% B2O3. In the lines A, B and E a decrease in the P2O5 and an increase of B2O3 content results in the shortening of phosphate chains with decreasing P2O5 content; these changes are most pronounced in line B with a constant BaO content. In lines C and D with a constant P2O5 content a decrease in the BaO content results, in contrast, in the reverse transformation of phosphate structural units in the direction Q(1) -> Q(2) -> Q(3) as detected from Raman spectra and P-31 MAS NMR spectra. B-11 MAS NMR spectra revealed that only BO4 units are present in the glasses with 0-20 mol% B2O3. In the glasses of the E series the fraction of BO3 units increases with a decreasing P2O5 content. By the decomposition of the 11B MAS NMR spectra it is possible to estimate the fractions of basic structural units formed by boron - B(OP)(3)O, B(OP)(2)O-2 and BO3 in all the glasses of the glass forming region.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F07%2F0315" target="_blank" >GA104/07/0315: Fosfátová a borofosfátová skla dotovaná oxidy těžkých kovů pro optoelektronické a fotonické aplikace.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Molecular Structure

ISSN

0022-2860

e-ISSN

—

Svazek periodika

1119

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

212-219

Kód UT WoS článku

000378360000025

EID výsledku v databázi Scopus

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