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Novel insights into electrical transport mechanism in ionic-polaronic glasses
Authors: Nikolic Juraj | Pavic Luka | Santic Ana | Mošner Petr | Koudelka Ladislav | Pajic Damir | Mogus-Milankovic Andrea
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Journal of the American Ceramic Society
Publisher name: Wiley-Blackwell
Place: Hoboken
Page from-to: 1221-1235
Titles:
Language Name Abstract Keywords
cze Nový pohled na mechanismus elektrické vodivosti v iontově-polaronových sklech Elektrická vodivost byla studována ve čtyřech kompozičních řadách fosforečnanových skel obsahujících WO3/MoO3 a Li+/Na+ ionty a to: xWO(3)-(30-0.5x)Li2O-(30-0.5x)ZnO-40P(2)O(5), xWO(3)-(30-0.5x)Na2O-(30.5x)ZnO-40P(2)O(5), xMoO(3)-(30-0.5x)Li2O-(30-0.5x)ZnO-40P(2)O(5), a xMoO(3)-(30-0.5x)Na2O-(30-0.5x)ZnO-40P(2)O(5), 0 x 60, (mol%). Ramanova spektra ukázala na tvorbu klastrů s vazbami W-O-W ve sklech s oxidem wolframových, zatímco tvorba klastrů nebyla pozorována ve sklech s oxidem molybdenovým. Tyto rozdíly vedly k nárůstu stejnosměrné vodivosti ve wolframových sklech s růstem obsahu WO3, zatímco ve sklech s MoO3 byla stejnosměrná vodivost téměř neměnná. mechanismus elektrické vodivosti; impedanční spektroskopie; iontová a polaronová vodivost; směsná iontově-polaronová skla
eng Novel insights into electrical transport mechanism in ionic-polaronic glasses Transformation of electrical transport from ionic to polaronic in glasses, which are a potential class of new cathode materials, has been investigated in four series containing WO3/MoO3 and Li+/Na+ ions, namely: xWO(3)-(30-0.5x)Li2O-(30-0.5x)ZnO-40P(2)O(5), xWO(3)-(30-0.5x)Na2O-(30.5x)ZnO-40P(2)O(5), xMoO(3)-(30-0.5x)Li2O-(30-0.5x)ZnO-40P(2)O(5), and xMoO(3)-(30-0.5x)Na2O-(30-0.5x)ZnO-40P(2)O(5), 0 x 60, (mol%). This study reports a detailed analysis of the role of structural modifications and its implications on the origin of electrical transport in these mixed ionic-polaron glasses. Raman spectra show the clustering of WO6 units by the formation of W-O-W bonds in glasses with high WO3 content while the coexistence of MoO4 and MoO6 units is evidenced in glasses containing MoO3 with no clustering of MoO6 octahedra. Consequently, DC conductivity of tungstate glasses with either Li+ or Na+ exhibits a transition from ionic to polaronic showing a minimum at about 20-30 mol% of WO3 as a result of ion-polaron interactions followed by a sharp increase for six orders of magnitude as WO3 content increases. The formation of WO6 clusters involved in W-O-W linkages for tungsten glasses plays a key role in significant increase in DC conductivity. On the other hand, DC conductivity is almost constant for glasses containing MoO3 suggesting an independent ionic and polaronic transport pathways for glasses containing 10-50 mol% of MoO3. electrical transport mechanisms; impedance spectroscopy; ionic and polaronic conductivity; mixed ion-polaron glasses

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