Tailoring structure for improved sodium mobility and electrical properties in V2O5-Nb2O5-P2O5 Glass(es)-(Ceramics)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F23%3A39920371" target="_blank" >RIV/00216275:25310/23:39920371 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022369723002512?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022369723002512?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpcs.2023.111461" target="_blank" >10.1016/j.jpcs.2023.111461</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tailoring structure for improved sodium mobility and electrical properties in V2O5-Nb2O5-P2O5 Glass(es)-(Ceramics)

Popis výsledku v původním jazyce

This study investigates the influence of structural modifications induced by the introduction of Nb2O5 on the thermal, (micro)structural, and electrical properties of quaternary system 35Na2O-10V2O5-(55-x)P2O5-xNb2O5 (x = 0-40 mol%). Non-monotonic trends in DC conductivity and activation energy are attributed to the facilitating effect of Nb2O5 on the transport of Na+ ions, confirming the mixed glass former effect. The results demonstrate that the electrical conductivity mechanism is purely ionic, with V2O5 acting as both, glass modifier and network-former with vanadate units being in predominantly 4-fold coordination and without actively participating in the conduction process. Complementary Raman and IR-ATR spectroscopic studies in combination with solid-state impedance spectroscopy (SS-IS) reveal a strong correlation between structural and electrical properties indicating that the enhancement in conductivity is driven by the formation of mixed niobatephosphate glass network. The increase in conductivity is followed by a gradual transition of glass structure from a predominantly phosphate glass network into a mixed niobate-phosphate glass network. In the predominantly niobate network, the 3D clustering of NbO6 octahedra hinders the transport of Na+ ions. The scaling features of the conductivity spectra additionally confirm the ionic mechanism of electrical transport and provide insight into the local dynamics of Na+ ions.

Název v anglickém jazyce

Tailoring structure for improved sodium mobility and electrical properties in V2O5-Nb2O5-P2O5 Glass(es)-(Ceramics)

Popis výsledku anglicky

This study investigates the influence of structural modifications induced by the introduction of Nb2O5 on the thermal, (micro)structural, and electrical properties of quaternary system 35Na2O-10V2O5-(55-x)P2O5-xNb2O5 (x = 0-40 mol%). Non-monotonic trends in DC conductivity and activation energy are attributed to the facilitating effect of Nb2O5 on the transport of Na+ ions, confirming the mixed glass former effect. The results demonstrate that the electrical conductivity mechanism is purely ionic, with V2O5 acting as both, glass modifier and network-former with vanadate units being in predominantly 4-fold coordination and without actively participating in the conduction process. Complementary Raman and IR-ATR spectroscopic studies in combination with solid-state impedance spectroscopy (SS-IS) reveal a strong correlation between structural and electrical properties indicating that the enhancement in conductivity is driven by the formation of mixed niobatephosphate glass network. The increase in conductivity is followed by a gradual transition of glass structure from a predominantly phosphate glass network into a mixed niobate-phosphate glass network. In the predominantly niobate network, the 3D clustering of NbO6 octahedra hinders the transport of Na+ ions. The scaling features of the conductivity spectra additionally confirm the ionic mechanism of electrical transport and provide insight into the local dynamics of Na+ ions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics and Chemistry of Solids

ISSN

0022-3697

e-ISSN

1879-2553

Svazek periodika

181

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

111461

Kód UT WoS článku

001021258300001

EID výsledku v databázi Scopus

2-s2.0-85161333551