Structural, magnetic, and oxygen storage properties of hexagonal Dy1−xYxMnO3+δ

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dc.contributor.authorAbughayada, Cen_AU
dc.contributor.authorDabrowski, Ben_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorKolesnik, Sen_AU
dc.contributor.authorRemsen, Sen_AU
dc.contributor.authorChmaissem, Oen_AU
dc.date.accessioned2021-01-18T21:36:54Zen_AU
dc.date.available2021-01-18T21:36:54Zen_AU
dc.date.issued2014-09en_AU
dc.date.statistics2021-01-11en_AU
dc.description.abstractSingle-phase polycrystalline samples of hexagonal Dy1−xYxMnO3+δ were synthesized over the full solubility range under reducing oxygen partial pressure conditions. Rietveld refinements using neutron powder diffraction data (NPD) confirmed the persistence of the parent hexagonal P63cm (Space group #185) structure for all the stoichiometric (δ=0) samples. The (Mn–O) bond lengths derived from NPD data were found to be consistent with non-degenerate Mn+3 high-spin state e“2 e′2 in trigonal–bipyramidal coordination. Detailed thermogravimetric measurements show large reversible oxygen storage/release capabilities (within the range of oxygen content 3.0–3.3) at unusually low temperatures of 200–400 °C in air or oxygen atmospheres. A phase transition to a new hexagonal phase (Hex1) was observed to take place around δ~0.29 for the oxygen-loaded Dy-rich samples (x<0.5). Analysis of x-ray and neutron diffraction data using Rietveld refinements demonstrate that the superstructure is formed by tripling the c-axis of the original P63cm unit cell. Modeling of the Hex1 superstructure converged to a structural symmetry consistent with the noncentrosymmetric space group R3c (#161). In magnetization measurements, a ferrimagnetic order for DyMnO3.0 was observed below 8 K. The dilution of Dy magnetism with nonmagnetic yttrium results in reducing both the transition temperature and the effective paramagnetic moment. © 2014 Elsevier Inc.en_AU
dc.identifier.citationAbughayada, C., Dabrowski, B., Avdeev, M., Kolesnik, S., Remsen, S., & Chmaissem, O. (2014) Structural, magnetic, and oxygen storage properties of hexagonal Dy1−xYxMnO3+δ, Journal of Solid State Chemistry, 217, 127-135. doi:10.1016/j.jssc.2014.05.017en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination127-135en_AU
dc.identifier.urihttps://doi.org/10.1016/j.jssc.2014.05.017en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10251en_AU
dc.identifier.volume217en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectPhase transformationsen_AU
dc.subjectHexagonal latticesen_AU
dc.subjectStoichiometryen_AU
dc.subjectThermal gravimetric analysisen_AU
dc.subjectMagnetismen_AU
dc.subjectFerrimagnetismen_AU
dc.titleStructural, magnetic, and oxygen storage properties of hexagonal Dy1−xYxMnO3+δen_AU
dc.typeJournal Articleen_AU
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