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Nature of mixed electrical transport in Ag2O-ZnO-P2O5 glasses containing WO3 and MoO3
Authors: Pavic Luka | Santic Ana | Nikolic Juraj | Mošner Petr | Koudelka Ladislav | Pajic Damir | Mogus-Milankovic Andrea
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Electrochimica Acta
Publisher name: Elsevier Science
Place: Oxford
Page from-to: 434-445
Titles:
Language Name Abstract Keywords
cze Elektrická vodivost skel systému Ag2O-ZnO-P2O5 s obsahem WO3 a MoO3 Práce je věnována vysvětlení podstaty elektrické vodivosti skel systému Ag2O-ZnO-P2O5 s obsahem WO3 a MoO3 připravených v kompoziční řadě xTMO (30-0.5x)Ag2O-(30-0.5x)ZnO-40P(2)O(5) (TMO = MoO3/WO3, 0 <= x <= 60 mol%). skla se směsnou iontově polaronovou vodivostí; oxidy přechodných kovů; impedanční spektroskopie; struktura; vlastnosti
eng Nature of mixed electrical transport in Ag2O-ZnO-P2O5 glasses containing WO3 and MoO3 This study reports on the nature of electrical transport and role of structural changes induced by different type and content of TMO in Ag-containing glasses of xTMO (30-0.5x)Ag2O-(30-0.5x)ZnO-40P(2)O(5) (TMO = MoO3/WO3, 0 <= x <= 60 mol%) composition. Raman spectra show clustering of WO6 units in glasses with high WO3 content while the addition of MoO3 induces a gradual change of MoO6 octahedra to MoO4 tetrahedra both being cross-linked with phosphate units without clustering. For WO3 glasses, minimum in DC conductivity is observed at 30-40 mol% of WO3 for temperatures from 303 to 513 K, followed by an increase in conductivity with further WO3 addition due to an increase in polaronic contribution. Observed turnover suggests a distinct transition from predominantly ionic to predominantly polaronic transport. On the contrary, for MoO3 glasses, conductivity decreases in the whole mixed compositional range indicating that the nature of transport is dominated by ionic component throughout the measured temperature range. A comparative study of Ag+, Li+, Na+ transport in MoO3/WO3 glasses reveals a strong correlation between pre-exponential factor and activation energy, which allows detection of the prevalence of conduction mechanism. Finally, the results demonstrate that Ag2O-WO3-ZnO-P2O6 glass system is a promising electrically tunable material with significant contributions of ionic or polaronic conductivity depending on composition. Mixed ion-polaron glasses; Transition metal oxide glasses; Impedance spectroscopy; Structure-property relationships; Cation mobility

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