Structural, magnetic and electronic properties of LaNi0.5Fe0.5O3 in the temperature range 5-1000 K

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dc.contributor.authorGateshki, Men_AU
dc.contributor.authorSuescun, Len_AU
dc.contributor.authorKolesnik, Sen_AU
dc.contributor.authorŚwierczek, Ken_AU
dc.contributor.authorShort, SMen_AU
dc.contributor.authorDabrowski, Ben_AU
dc.contributor.authorMais, Jen_AU
dc.date.accessioned2009-07-30T05:49:18Zen_AU
dc.date.accessioned2010-04-30T05:06:07Zen_AU
dc.date.available2009-07-30T05:49:18Zen_AU
dc.date.available2010-04-30T05:06:07Zen_AU
dc.date.issued2008-08en_AU
dc.date.statistics2008-08en_AU
dc.description.abstractThe structure, magnetism, transport and thermal expansion of the perovskite oxide LaNi0.5Fe0.5O3 were studied over a wide range of temperatures. Neutron time-of-flight data have shown that this compound undergoes a first-order phase transition between similar to 275 and similar to 310K. The structure transforms from orthorhombic (Pbnm) at low temperatures to rhombohedral (R (3) over barc) above room temperature. This phase transition is the cause for the previously observed co-existence of phases at room temperature. The main structural modification associated with the phase transition is the change of tilting pattern of the octahedra from a(+)b(-)b(-) at low temperatures to a(-)a(-)a(-) at higher. Magnetic data strongly suggests that a spin-glass magnetic state exists in the sample below 83 K consistent with the absence of magnetic ordering peaks in the neutron data collected at 30K. At high temperatures the sample behaves as a small polaron electronic conductor with two regions of slightly different activation energies of 0.07 and 0.05 eV above and below 553 K, respectively. The dilatometric data show an average thermal expansion coefficient of 14.7 x 10(-6) K-1 which makes this material compatible with frequently used electrolytes in solid oxide fuel cells. © 2008, Elsevier Ltd.en_AU
dc.identifier.citationGateshki, M., Suescun, L., Kolesnik, S., Mais, J., Świerczek, K., Short, S., & Dabrowski, B. (2008). Structural, magnetic and electronic properties of LaNi0.5Fe0.5O3 in the temperature range 5-1000 K. Journal of Solid State Chemistry, 181(8), 1833-1839. doi:10.1016/j.jssc.2008.03.041en_AU
dc.identifier.govdoc1392en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination1833-1839en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2008.03.041en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1569en_AU
dc.identifier.volume8en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSolid oxide fuel cellsen_AU
dc.subjectCrystal structureen_AU
dc.subjectCathodesen_AU
dc.subjectPerovskitesen_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.titleStructural, magnetic and electronic properties of LaNi0.5Fe0.5O3 in the temperature range 5-1000 Ken_AU
dc.typeJournal Articleen_AU
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