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Mixed Ion-Polaron Glasses as New Catode Materials

Authors: Nikolić Juraj | Šantić Anna | Pavić Luka | Pajić Damir | Mošner Petr | Koudelka Ladislav | Moguš-Milanković Andrea

Year: 2017

Type of publication: článek v odborném periodiku

Name of source: Croatica Chemica Acta

Page from-to: 657-665

Titles:

Language	Name	Abstract	Keywords
cze	Skla se směsnou iontově polaronovou vodivostí jako nové katodové materiály	Práce je věnována studiu elektrických vlastností oxidových skel připravených ve čtyřech kompozičních řadách xWO3-(30-0.5x)Na2O-(30-0.5x)ZnO-40P2O5, xWO3-(30-0.5x)Ag2O-(30-0.5x)ZnO-40P2O5, xMoO3-(30-0.5x)Na2O-(30-0.5x)ZnO-40P2O5 a xMoO3-(30-0.5x)Ag2O-(30-0.5x)ZnO-40P2O5, 0 ≤ x ≤ 60 (mol%).	skla; iontová vodivost; polaronová vodivost; transportní mechanismus; impedanční spektroskopie
eng	Mixed Ion-Polaron Glasses as New Catode Materials	Electrical transport in mixed ion-polaron glasses has been investigated in four series of glasses containing transition metal oxides (TMO) namely WO3/MoO3, and Na+/Ag+ ions with the composition xWO3-(30-0.5x)Na2O-(30-0.5x)ZnO-40P2O5, xWO3-(30-0.5x)Ag2O-(30-0.5x)ZnO-40P2O5, xMoO3-(30-0.5x)Na2O-(30-0.5x)ZnO-40P2O5, and xMoO3-(30-0.5x)Ag2O-(30-0.5x)ZnO-40P2O5, 0 ≤ x ≤ 60 (mol%). The DC con-ductivity of Na-glasses up to 30 mol% of WO3 and MoO3 is almost identical due to the dominance of ionic conductivity. In this compositional region, the introduction of tungstate and molybdate units increases the mobility of sodium ions and compensates the decrease in sodium number density. On the other hand, with increasing WO3 and MoO3 content and decreasing Ag+ ion concentration in Ag-glasses the DC conduc-tivity decreases for few orders of magnitude. A significant difference in conductivity is observed for glasses with higher WO3 and MoO3 content. While for glasses containing WO3 the conductivity rapidly increases due to a huge polaronic contribution indicating a turnover from predomi-nantly ionic to polaronic transport, the conductivity for MoO3-glasses decreases in the entire mixed compositional range suggesting dominant ionic transport. The changes in the conduction mechanism with the systematic alternation of the glass composition have been analyzed in correlation with the structural modifications and variations of molybdenum and tungsten in different oxidation states.	mixed ion-polaron glasses; ionic and polaronic conductivity; electrical transport mechanisms; impedance spectroscopy