Crystal structures and phase transition in (Sr0.8Ce0.2)(Mn(1-y)Coy)O-3 (y=0 and 0.2): the influence of Jahn-Teller distortion

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dc.contributor.authorZhang, Zen_AU
dc.contributor.authorHoward, CJen_AU
dc.contributor.authorKennedy, BJen_AU
dc.contributor.authorMatsuda, Men_AU
dc.contributor.authorMiyake, Men_AU
dc.date.accessioned2010-03-03T05:33:06Zen_AU
dc.date.accessioned2010-04-30T05:05:48Zen_AU
dc.date.available2010-03-03T05:33:06Zen_AU
dc.date.available2010-04-30T05:05:48Zen_AU
dc.date.issued2009-03-25en_AU
dc.date.statistics2009-03-25en_AU
dc.description.abstractWe have studied the crystal structures of (Sr0.8Ce0.2)(Mn1-yCoy)O-3 (y = 0 and 0.2) using neutron diffraction. Both (Sr0.8Ce0.2)MnO3 and (Sr0.8Ce0.2)(Mn0.8Co0.2)O-3 have a tetragonal structure in space group I4/mcm at room temperature, and the octahedral tilt angle around the c-axis is nearly the same. The only significant difference is the shape of the Mn(Co)O-6 octahedron: it is elongated in (Sr0.8Ce0.2)MnO3 due to the cooperative Jahn-Teller (JT) effect, but essentially regular in (Sr0.8Ce0.2)(Mn0.8Co0.2) O3 due to the absence of JT-active Mn3+ ions. With increasing temperature, both compounds undergo a continuous phase transition at around 400°C to a cubic structure in Pm (3) over barm, with no indication of a distinct transition in (Sr0.8Ce0.2) MnO3 from the removal of the static JT distortion. In addition, the temperature dependence of the octahedral tilt angle is very similar in the two samples, implying that the JT distortion has minimal effect on the octahedral tilting and the phase transition to cubic. X-ray absorption near-edge structure (XANES) analysis indicates that the Ce oxidation state is predominantly 4+ in both samples. The electrical conductivity is higher in (Sr0.8Ce0.2)MnO3 than in (Sr0.8Ce0.2)(Mn0.8Co0.2)O-3 in the temperature range studied (100-900°C). © 2009, Institute of Physicsen_AU
dc.identifier.articlenumber124218en_AU
dc.identifier.citationZhang, Z., Howard, C. J., Kennedy, B. J., Matsuda, M., & Miyake, M. (2009). Crystal structures and phase transition in (sr0.8ce0.2)(mn(1-y)coy)o-3 (y=0 and 0.2): the influence of Jahn-Teller distortion. Journal of Physics: Condensed Matter, 21(12), 124218. doi:10.1088/0953-8984/21/12/124218en_AU
dc.identifier.govdoc1373en_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleJournal of Physics: Condensed Matteren_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0953-8984/21/12/124218en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2953en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherInstitute of Physicsen_AU
dc.subjectCrystal structureen_AU
dc.subjectPhase transformationsen_AU
dc.subjectJahn-Teller effecten_AU
dc.subjectNeutron diffractionen_AU
dc.subjectElectric conductivityen_AU
dc.subjectTemperature rangeen_AU
dc.titleCrystal structures and phase transition in (Sr0.8Ce0.2)(Mn(1-y)Coy)O-3 (y=0 and 0.2): the influence of Jahn-Teller distortionen_AU
dc.typeJournal Articleen_AU
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