Oxygen nonstoichiometry, chemical expansion, mixed conductivity, and anodic behavior of Mo-substituted Sr3Fe2O7-δ

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dc.contributor.authorKharton, VVen_AU
dc.contributor.authorPatrakeev, MVen_AU
dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorNaumovich, ENen_AU
dc.contributor.authorAnikina, PVen_AU
dc.contributor.authorWaerenborgh, JCen_AU
dc.date.accessioned2010-08-23T00:35:54Zen_AU
dc.date.available2010-08-23T00:35:54Zen_AU
dc.date.issued2010-07-26en_AU
dc.date.statistics2010-07-26en_AU
dc.description.abstractThe incorporation of molybdenum in the Ruddlesden-Popper type Sr3Fe2-xMoxO7-δ (x = 0–0.1) decreases oxygen deficiency, thermal expansion and electron-hole transport, and increases n-type electronic conductivity in reducing atmospheres. The oxygen ionic conduction remains essentially unaffected by doping. The equilibrium p(O2)–T–δ diagram of Sr3Fe1.9Mo0.1O7-δ, collected in oxygen partial pressure ranges from 10− 20 to 0.7 atm at 973–1223 K, can be adequately described by a defect model accounting for the energetic nonequivalence of apical O1 and equatorial O3 sites in the layered structure, in combination with iron disproportionation and stable octahedral coordination of Mo6+ and Mo5+ cations. The calculated enthalpy of anion exchange between the O1 and O3 positions, 0.49–0.51 eV, is in agreement with the values predicted by the atomistic computer simulation technique. The high-temperature X-ray diffraction studies showed a strongly anisotropic expansion of the Ruddlesden-Popper lattice on reduction, leading to very low chemical strains favorable for electrochemical applications. At 298–1223 K and oxygen pressures from 10− 8 to 0.21 atm, the linear thermal expansion coefficient of Sr3Fe1.9Mo0.1O7-δ varies in the narrow range (12.9–14.2) × 10− 6 K− 1. The relatively low level of n-type electronic conductivity leads, however, to a poor performance of porous Sr3Fe1.9Mo0.1O7-δ anodes in contact with lanthanum gallate-based solid electrolyte under reducing conditions. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationKharton, V. V., Patrakeev, M. V., Tsipis, E. V., Avdeev, M., Naumovich, E. N., Anikina, P. V., & Waerenborough, J. C. (2010). Oxygen nonstoichiometry, chemical expansion, mixed conductivity, and anodic behavior of Mo-substituted Sr3Fe2O7-δ. Solid State Ionics, 181(21-22), 1052-1063. doi:10.1016/j.ssi.2010.06.004en_AU
dc.identifier.govdoc2465en_AU
dc.identifier.issn0167-2738en_AU
dc.identifier.issue21-22en_AU
dc.identifier.journaltitleSolid State Ionicsen_AU
dc.identifier.pagination1052-1063en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ssi.2010.06.004en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2284en_AU
dc.identifier.volume181en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectOxygenen_AU
dc.subjectPoint defectsen_AU
dc.subjectFerritesen_AU
dc.subjectPerovskitesen_AU
dc.subjectElectric conductorsen_AU
dc.subjectThermal expansionen_AU
dc.titleOxygen nonstoichiometry, chemical expansion, mixed conductivity, and anodic behavior of Mo-substituted Sr3Fe2O7-δen_AU
dc.typeJournal Articleen_AU
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