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Scaling Features of Conductivity Spectra Reveal Complexities in Ionic, Polaronic Andmixed Ionic-Polaronic Conduction in Phosphate Glasses

28 Pages Posted: 26 Mar 2019 First Look: Accepted

See all articles by Ana Šantić

Ana Šantić

Ruđer Bošković Institute - Division of Materials Chemistry

Juraj Nikolić

Ruđer Bošković Institute - Division of Materials Chemistry

Luka Pavić

Ruđer Bošković Institute - Division of Materials Chemistry

Radha D. Banhatti

Ruđer Bošković Institute - Division of Materials Chemistry

Petr Mošner

University of Pardubice - Department of General and Inorganic Chemistry

Ladislav Koudelka

University of Pardubice - Department of General and Inorganic Chemistry

Andrea Moguš-Milanković

Ruđer Bošković Institute - Division of Materials Chemistry

Abstract

The scaling behaviour of six series of mixed ion-polaron glasses with the composition xWO3/MoO3-(30-0.5x)Li2O/Na2O/Ag2O-(30-0.5x)ZnO-40P2O5, 0≤x≤60 mol%, has been studied using Summerfield and Sidebottom scaling procedures that are model free. The validity of the Sidebottom scaling procedure for each individual glass confirms that all glasses obey time-temperature superposition principle implying that the conduction mechanism does not change with temperature. On the other hand, Summerfield scaling is not found valid for all glasses. First, this deviation is observed in all glasses containing Li2O up to 20 mol% of MoO3/WO3. We relate this result to a non-typical interaction of Li+ ion with the compact zinc phosphate network resulting either in change of its hopping distance or in available conduction pathways for it as a function of temperature. Second, non-Summerfield scaling was also observed for glasses containing Li2O/Na2O/Ag2O with about 30 to 40 mol% of WO3. Thus, the origin of this deviation lies in the significant amounts of both types of charge carriers - ions and polarons, and their differently thermally activated mobilities. Finally, based on a comparison of master-curves of all glasses with varying fractions of Li2O/Na2O/Ag2O and MoO3/WO3 we identify varied effects of the transition metal oxide on the transport of mobile ions as also the presence of mixed ion-polaron conduction.

Keywords: electrical conductivity, polaron, ionic diffusion, impedance spectroscopy, phosphate glasses, structure-property relationship

Suggested Citation

Šantić, Ana and Nikolić, Juraj and Pavić, Luka and Banhatti, Radha D. and Mošner, Petr and Koudelka, Ladislav and Moguš-Milanković, Andrea, Scaling Features of Conductivity Spectra Reveal Complexities in Ionic, Polaronic Andmixed Ionic-Polaronic Conduction in Phosphate Glasses (March 23, 2019). A-19-465. Available at SSRN: https://ssrn.com/abstract=3358871

Ana Šantić (Contact Author)

Ruđer Bošković Institute - Division of Materials Chemistry ( email )

Bijenička cesta 54
Zagreb, 100000
Croatia

Juraj Nikolić

Ruđer Bošković Institute - Division of Materials Chemistry

Bijenička cesta 54
Zagreb, 100000
Croatia

Luka Pavić

Ruđer Bošković Institute - Division of Materials Chemistry

Bijenička cesta 54
Zagreb, 100000
Croatia

Radha D. Banhatti

Ruđer Bošković Institute - Division of Materials Chemistry

Bijenička cesta 54
Zagreb, 100000
Croatia

Petr Mošner

University of Pardubice - Department of General and Inorganic Chemistry

53210 Pardubice
Czech Republic

Ladislav Koudelka

University of Pardubice - Department of General and Inorganic Chemistry

53210 Pardubice
Czech Republic

Andrea Moguš-Milanković

Ruđer Bošković Institute - Division of Materials Chemistry

Bijenička cesta 54
Zagreb, 100000
Croatia

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