Oxygen permeability, thermal expansion and stability of SrCo0.8Fe0.2O3−δ–SrAl2O4 composites

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dc.contributor.authorYaremchenko, AAen_AU
dc.contributor.authorKharton, VVen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorShaula, ALen_AU
dc.contributor.authorMarques, FMBen_AU
dc.date.accessioned2008-04-21en_AU
dc.date.accessioned2010-04-30T05:03:14Zen_AU
dc.date.available2008-04-21en_AU
dc.date.available2010-04-30T05:03:14Zen_AU
dc.date.issued2007-07-15en_AU
dc.date.statistics2007-07en_AU
dc.description.abstractAdditions of SrAl2O4 phase to mixed-conducting SrCo0.8Fe0.2O3−δ promote oxygen-vacancy ordering and brownmillerite formation at temperatures below 1050 K due to Al3+ incorporation, but also decrease thermal expansion coefficients (TECs) and improve thermal shock stability. The SrCo0.8Fe0.2O3−δ–SrAl2O4 composite membranes exhibit also a relatively high stability with respect to interaction with CO2 due to A-site deficiency of the perovskite-related phase, caused by partial SrAl2O4 dissolution. The oxygen permeability and electronic conductivity of (SrCo0.8Fe0.2O3−δ)1−x(SrAl2O4)x (x=0.3–0.7) composites are determined by the perovskite component and decrease with increasing x. Despite minor diffusion of the transition metal cations into SrAl2O4, hexagonal above 940 K and monoclinic in the low-temperature range, this phase has insulating properties. Nonetheless, at x=0.3 the oxygen permeation fluxes at 1073–1173 are similar to those through single-phase SrCo0.8Fe0.2O3−δ membranes. The average TECs of the composite materials, calculated from dilatometric data in air, vary in the ranges (10.0–11.3)×10−6 K−1 at 300–900 K and (14.7–21.1)×10−6 K−1 at 900–1100 K. The low-p(O2) stability limit and electronic transport properties of SrCo0.8Fe0.2O3−δ are briefly discussed. © 2007, Elsevier Ltd.en_AU
dc.identifier.citationYaremehenko, A. A., Kharton, V. V., Avdeev, M., Shaula, A. L., & Marques, F. M. B. (2007). Oxygen permeability, thermal expansion and stability of SrCo0.8Fe0.2O3−δ–SrAl2O4 composites. Solid State Ionics, 178(19-20), 1205-1217. doi:10.1016/j.ssi.2007.05.016en_AU
dc.identifier.govdoc1208en_AU
dc.identifier.issn0167-2738en_AU
dc.identifier.issue19-20en_AU
dc.identifier.journaltitleSolid State Ionicsen_AU
dc.identifier.pagination1205-1217en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.ssi.2007.05.016en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1086en_AU
dc.identifier.volume178en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectMembranesen_AU
dc.subjectConductor devicesen_AU
dc.subjectPerovskiteen_AU
dc.subjectOxygenen_AU
dc.subjectPermeabilityen_AU
dc.subjectThermal expansionen_AU
dc.subjectStabilityen_AU
dc.subjectElectric conductivityen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectTransporten_AU
dc.titleOxygen permeability, thermal expansion and stability of SrCo0.8Fe0.2O3−δ–SrAl2O4 compositesen_AU
dc.typeJournal Articleen_AU
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