Naslov
Electrical and structural properties of K2O-Nb2O5-P2O5 glasses

Autori
Razum, Marta ; Pavić, Luka ; Ghussn, Luciana ; Moguš-Milanković, Andrea ; Šantić, Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts presented at the 14th International Symposium on Systems with Fast Ionic Transport (ISSFIT-14) / Petek, Urša ; Gaberšček, Miran - Ljubljana : National Institute of Chemistry Ljubljana, 2021, 41-41

ISBN
978-961-6104-50-0

Skup
14th International Symposium on Systems with Fast Ionic Transport (ISSFIT 2021)

Mjesto i datum
Online, 07.07.2021. - 09.07.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
conductivity spectra ; glass structure ; ionic conductivity ; niobium phosphate glasses

Sažetak
Niobium phosphate glasses have functional properties which make them attractive for various fields of application, from optical and laser technology, nuclear waste immobilization to biomedicine. [1] Moreover, in combination with alkali oxides, niobium oxide can be incorporated in a phosphate network in a wide compositional range which makes these glasses interesting for electrical applications. In this study, glasses with composition xNb2O5-(100-x)[0.45K2O-0.55P2O5], x=10-50 mol%, were prepared by microwave heating and their ionic conductivity and structure were investigated by impedance and Raman spectroscopies. Raman spectra reveal that the glass structure changes from predominantly orthophosphate (x≤20 mol%) to predominantly niobate (x=50 mol%) with increasing Nb2O5 content. In the glass network, niobium forms NbO6 octahedra which, at higher Nb2O5 content, become mutually interconnected via Nb-O-Nb bonds. The changes of the electrical conductivity with composition suggest a strong influence of glass structure on the mobility of potassium ions. Glasses with predominantly orthophosphate structure and predominantly niobate glass network exhibit a slight decrease in DC conductivity with increasing Nb2O5 content, whereas intermediate glass compositions show a strong drop which could be attributed to the hampering effect of the mixed niobate-phosphate network on the diffusion of potassium ions. On the contrary, predominantly niobate glass network exhibits a rather facilitating influence which is evidenced not just by the trend of DC conductivity but also by the features of the frequency-dependent conductivity and typical hopping lengths of potassium ions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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