Structure and properties of barium niobophosphate glasses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39910792" target="_blank" >RIV/00216275:25310/17:39910792 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2017.01.009" target="_blank" >http://dx.doi.org/10.1016/j.jnoncrysol.2017.01.009</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2017.01.009" target="_blank" >10.1016/j.jnoncrysol.2017.01.009</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structure and properties of barium niobophosphate glasses

Popis výsledku v původním jazyce

Phosphate glasses of the ternary system BaO-xNb(2)O(5)-P2O5 were studied in two compositional series, namely 40BaO-xNb(2)O(5)-(60-x)P205 (series A), with x = 0-40 mol% Nb2O5, and yBaO-xNb(2)O(5)-(80-y)P2O5 (series B), with y = 20-60 mol% BaO. Nine homogeneous glassy samples were prepared altogether in both series, and their basic physical properties (density, molar volume, glass transition temperature, dilatometric softening temperature and thermal expansion coefficient) were determined. The chemical durability of the Nb2O5-containing glasses is high and the dissolution rate at 80 degrees C is lower than 4-5 x 10(-8)g cm(-2) min(-1). The glass transition temperature of the glasses in series A increased significantly with increasing Nb2O5 content from 324 to 727 degrees C, whereas in the series B with increasing BaO content, Tg increased within the range 620-725 degrees C. The index of refraction increased more steeply in glass series A with increasing Nb2O5 content than in the glass series B. According to the Raman spectra in the glass series A, at low Nb2O5 content niobium forms isolated octahedra NbO6 incorporated in the glass network, but when Nb2O5 content increases, these octahedra are linked into chains and further into three-dimensional clusters. In glass series B, NbO6 octahedra form only Nb O Nb-O-chains connecting NbO6 octahedra. NbO6 octahedra clustering is reflected also in the 31P MAS NMR spectra of BaO-Nb2O5-P2O5 glasses showing on a non-monotonous transformation of phosphate units in the direction Q(3) -&gt; Q(2) -&gt; Q(1) -&gt; Q(0), both with increasing Nb2O5 content in the first A series and BaO content in the second B series.

Název v anglickém jazyce

Structure and properties of barium niobophosphate glasses

Popis výsledku anglicky

Phosphate glasses of the ternary system BaO-xNb(2)O(5)-P2O5 were studied in two compositional series, namely 40BaO-xNb(2)O(5)-(60-x)P205 (series A), with x = 0-40 mol% Nb2O5, and yBaO-xNb(2)O(5)-(80-y)P2O5 (series B), with y = 20-60 mol% BaO. Nine homogeneous glassy samples were prepared altogether in both series, and their basic physical properties (density, molar volume, glass transition temperature, dilatometric softening temperature and thermal expansion coefficient) were determined. The chemical durability of the Nb2O5-containing glasses is high and the dissolution rate at 80 degrees C is lower than 4-5 x 10(-8)g cm(-2) min(-1). The glass transition temperature of the glasses in series A increased significantly with increasing Nb2O5 content from 324 to 727 degrees C, whereas in the series B with increasing BaO content, Tg increased within the range 620-725 degrees C. The index of refraction increased more steeply in glass series A with increasing Nb2O5 content than in the glass series B. According to the Raman spectra in the glass series A, at low Nb2O5 content niobium forms isolated octahedra NbO6 incorporated in the glass network, but when Nb2O5 content increases, these octahedra are linked into chains and further into three-dimensional clusters. In glass series B, NbO6 octahedra form only Nb O Nb-O-chains connecting NbO6 octahedra. NbO6 octahedra clustering is reflected also in the 31P MAS NMR spectra of BaO-Nb2O5-P2O5 glasses showing on a non-monotonous transformation of phosphate units in the direction Q(3) -&gt; Q(2) -&gt; Q(1) -&gt; Q(0), both with increasing Nb2O5 content in the first A series and BaO content in the second B series.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

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)

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

459

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

68-74

Kód UT WoS článku

000395608200011

EID výsledku v databázi Scopus

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