Ionic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskite

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dc.contributor.authorKharton, VVen_AU
dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorKolotygin, VAen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorKennedy, BJen_AU
dc.date.accessioned2021-07-30T01:57:31Zen_AU
dc.date.available2021-07-30T01:57:31Zen_AU
dc.date.issued2020-07-07en_AU
dc.date.statistics2021-07-06en_AU
dc.description.abstractTransport properties of perovskite-type Sr11Mo4O23 and composite Sr11Mo4O23 - 1 wt% Al2O3 were studied at 400–1300 K in the oxygen partial pressure range from 0.21 down to 10−19 atm. The electromotive force and faradaic efficiency measurements, in combination with the energy-dispersive spectroscopy of the fractured electrochemical cells, unambiguously showed prevailing role of the oxygen ionic conductivity under oxidizing conditions. At temperatures above 600 K, protonic and cationic transport can be neglected. The oxygen ion transference numbers vary in the range of 0.95–1.00 at 973–1223 K. At temperatures lower than 550 K, the total conductivity of Sr11Mo4O23 - 1 wt% Al2O3 composite measured by impedance spectroscopy tends to increase in wet atmospheres, thus indicating that hydration and protonic transport become significant. Reducing oxygen partial pressure below 10−10–10−9 atm leads to a significant increase in the n-type electronic conduction. The average thermal expansion coefficients in oxidizing atmospheres are (14.3–15.0) × 10−6 K−1 at 340–740 K and (18.3–19.2) × 10−6 K−1 at 870–1370 K. © 2020, Springer-Verlag GmbH Germany, part of Springer Natureen_AU
dc.identifier.citationKharton, V. V., Tsipis, E. V., Kolotygin, V. A., Avdeev, M., & Kennedy, B. J. (2020). Ionic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskite. Journal of Solid State Electrochemistry, 24, 2943–2951. doi:10.1007/s10008-020-04688-xen_AU
dc.identifier.issn1433-0768en_AU
dc.identifier.journaltitleJournal of Solid State Electrochemistryen_AU
dc.identifier.pagination2943-2951en_AU
dc.identifier.urihttps://doi.org/10.1007/s10008-020-04688-xen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11159en_AU
dc.identifier.volume24en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectThermal expansionen_AU
dc.subjectElectrolytesen_AU
dc.subjectOxidesen_AU
dc.subjectStrontium compoundsen_AU
dc.subjectMolybdatesen_AU
dc.subjectIonic conductivityen_AU
dc.subjectOxygenen_AU
dc.subjectElectric conductorsen_AU
dc.subjectImpedanceen_AU
dc.titleIonic conductivity and thermal expansion of anion-deficient Sr11Mo4O23 perovskiteen_AU
dc.typeJournal Articleen_AU
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