Structural study of BaO-MoO3-P2O5 glasses by Raman and NMR spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39910791" target="_blank" >RIV/00216275:25310/17:39910791 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2017.09.040" target="_blank" >http://dx.doi.org/10.1016/j.jnoncrysol.2017.09.040</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2017.09.040" target="_blank" >10.1016/j.jnoncrysol.2017.09.040</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structural study of BaO-MoO3-P2O5 glasses by Raman and NMR spectroscopy

Popis výsledku v původním jazyce

Glasses in the BaO-MoO3P2O5 ternary system were prepared, their basic physical properties measured and their structure studied by Raman and P-31 NMR spectroscopies. A modified glass-forming region in this system under slow cooling of the melt was determined. Four compositional series, namely (50-x/2)BaO-xMoO(3)-(50-x/2)P2O5 (A), 50BaO-yMoO(3)-(50-y)P2O5 (B), 20BaO-zMoO(3)-(80-z)P2O5 (C) and (70-u)BaO-uMoO(3)-30P(2)O(5) (D) were chosen for a discussion on changes of the structure and properties of the studied glasses. The glass transition temperature revealed a maximum in series A at x = 40 mol% MoO3 and in series C at z = 50 mol% MoO3, whereas monotonous increase of T-g in the series B and monotonous decrease in the series D was observed. P-31 MAS NMR spectra of the glasses revealed depolymerization of the phosphate network, due to the incorporation of molybdate units, and isolated PO4 groups were identified in glasses with high MoO3 content. Fitting the NMR spectra provided compositional dependences of phosphate units Q(n). On the Raman spectra of glasses with low MoO3 content, a strong vibrational band at 940944 cm (-1), with a shoulder at similar to 910 cm (-1), dominated the spectra, which was assigned to the vibration of terminal oxygen atoms in molybdate structural units (M-O- and M=O). In glasses with high MoO3 content, a broad band at similar to 854 cm(-1), ascribed to Mo-O-Mo bonds, showed on the formation of octahedral clusters composed of MoO6 units in the structure of these glasses.

Název v anglickém jazyce

Structural study of BaO-MoO3-P2O5 glasses by Raman and NMR spectroscopy

Popis výsledku anglicky

Glasses in the BaO-MoO3P2O5 ternary system were prepared, their basic physical properties measured and their structure studied by Raman and P-31 NMR spectroscopies. A modified glass-forming region in this system under slow cooling of the melt was determined. Four compositional series, namely (50-x/2)BaO-xMoO(3)-(50-x/2)P2O5 (A), 50BaO-yMoO(3)-(50-y)P2O5 (B), 20BaO-zMoO(3)-(80-z)P2O5 (C) and (70-u)BaO-uMoO(3)-30P(2)O(5) (D) were chosen for a discussion on changes of the structure and properties of the studied glasses. The glass transition temperature revealed a maximum in series A at x = 40 mol% MoO3 and in series C at z = 50 mol% MoO3, whereas monotonous increase of T-g in the series B and monotonous decrease in the series D was observed. P-31 MAS NMR spectra of the glasses revealed depolymerization of the phosphate network, due to the incorporation of molybdate units, and isolated PO4 groups were identified in glasses with high MoO3 content. Fitting the NMR spectra provided compositional dependences of phosphate units Q(n). On the Raman spectra of glasses with low MoO3 content, a strong vibrational band at 940944 cm (-1), with a shoulder at similar to 910 cm (-1), dominated the spectra, which was assigned to the vibration of terminal oxygen atoms in molybdate structural units (M-O- and M=O). In glasses with high MoO3 content, a broad band at similar to 854 cm(-1), ascribed to Mo-O-Mo bonds, showed on the formation of octahedral clusters composed of MoO6 units in the structure of these glasses.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

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

476

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

114-121

Kód UT WoS článku

000413615800016

EID výsledku v databázi Scopus

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