Publication detail

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

Year: 2023

Type of publication: článek v odborném periodiku

Name of source: Journal of Physics and Chemistry of Solids

Publisher name: Elsevier Science Inc.

Place: New York

Page from-to: 111461

Titles:

Language	Name	Abstract	Keywords
cze	Přizpůsobení struktury pro zlepšení pohyblivosti sodíku a elektrických vlastností ve sklech a sklokeramice systému V2O5-Nb2O5-P2O5	Práce je zaměřena na studium vlivu modifikace struktury (mikrostruktury) sodných vanadáto-fosfátových skel a sklokeramiky přídavky oxidu niobičného v kompoziční řadě 35Na2O-10V2O5-(55-x)P2O5-xNb2O5 (x = 0-40 mol%) a jejímu vlivu na pohyblivosti sodíku a elektrické vlastnosti těchto materiálů.	Fosporečnanová skla; Sklokeramika; Struktura; Ramanova spektroskopie; Impedanční spektroskopie; IR-ATR; SEM; PXRD
eng	Tailoring structure for improved sodium mobility and electrical properties in V2O5-Nb2O5-P2O5 Glass(es)-(Ceramics)	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.	Phosphate glasses; Glass-ceramics; micro(structure) correlation; Impedance spectroscopy; IR-ATR; Raman; SEM; PXRD

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