Structure and properties of barium niobophosphate glasses
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Structure and properties of barium niobophosphate glasses
Original language description
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) -> Q(2) -> Q(1) -> Q(0), both with increasing Nb2O5 content in the first A series and BaO content in the second B series.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
<a href="/en/project/GA13-00355S" target="_blank" >GA13-00355S: Multicomponent phosphate and borophosphate glasses</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Non-Crystalline Solids
ISSN
0022-3093
e-ISSN
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Volume of the periodical
459
Issue of the periodical within the volume
March
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
7
Pages from-to
68-74
UT code for WoS article
000395608200011
EID of the result in the Scopus database
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