Compression mechanism of HoBaCo4O7, a compound with oxygen absorption/desorption capabilities

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dc.contributor.authorJuarez-Arellano, EAen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorMacquart, RBen_AU
dc.contributor.authorFriedrich, Aen_AU
dc.contributor.authorMorgenroth, Wen_AU
dc.contributor.authorWiehl, Len_AU
dc.contributor.authorWinkler, Ben_AU
dc.date.accessioned2021-10-21T02:37:06Zen_AU
dc.date.available2021-10-21T02:37:06Zen_AU
dc.date.issued2007en_AU
dc.date.statistics2021-09-06en_AU
dc.description.abstractRecently, a new family of isostructural cobaltates (MBaCo4O7, M = In, Y, Ln) has been synthesized [1]. These cobaltates belong to a new class of geometrically frustrated magnets which not only exhibit interesting magnetic-, electronic-, thermoelectric- and electrochemical-properties; but they also have a remarkable low-temperature oxygen absorption/desorption capability which makes them suitable as oxygen sensors, oxygen permeation membranes and solid oxide fuel cells (SOFCs) [2-3]. For example, YBaCo4O7+δ reversibly absorb and desorb oxygen up to δ ≈ 1.5 in a narrow temperature range, 470-673 K [2]. Hence, an amount of oxygen that corresponds to ~20% of the total oxygen content is readily loaded or removed being triggered by just a tiny change in temperature or atmosphere. This oxygen capability substantially exceeds in the overall magnitude and in the response sensitivity to those achieved with, for example, SrFeO3 (perovskite structure) and YBa2Cu3O7 (perovskite-like structure) [3]. It is well known that the oxygen diffusion properties of perovskite-like compounds are affected not only by the temperature and surrounding oxygen partial pressure but also by their crystal structures. Therefore, a different crystal structure will result in different oxygen diffusion properties. There is currently a discussion about whether the MBaCo4O7 crystallizes in the space group P63mc or in the trigonal subgroup P31c at room temperature; or whether MBaCo4O7 undergoes temperature-induced structural phase transitions at low temperature or not. Nothing is known about the influence of pressure on MBaCo4O7 compounds, but the apparent thermal instability suggests that these compounds will undergo structural phase transitions at elevated pressure. © 2021 HASYLABen_AU
dc.identifier.booktitleHASYLAB Annual Report 2007en_AU
dc.identifier.citationJuarez-Arellano, E. A., Avdeev, M., Macquart, R. B., Friedrich, A., Morgenroth, W., Wiehl, L., & Winkler, B. (2007). Compression mechanism of HoBaCo4O7, a compound with oxygen absorption/desorption capabilities. In HASYLAB Annual Report 2007, (pp. 985). Hamburg, Germany. Research Centre of the Helmholtz Association. en_AU
dc.identifier.pagination985en_AU
dc.identifier.placeofpublicationHamburg, Germanyen_AU
dc.identifier.urihttps://photon-science.desy.de/research/scientific_media/desy_photon_science_annual_reports/archive/2007/index_eng.htmlen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12033en_AU
dc.language.isoenen_AU
dc.publisherDeutsches Elektronen-Synchrotronen_AU
dc.subjectCobalten_AU
dc.subjectElectrochemistryen_AU
dc.subjectOxygenen_AU
dc.subjectPerovskiteen_AU
dc.subjectCrystal structureen_AU
dc.subjectPhase transformationsen_AU
dc.titleCompression mechanism of HoBaCo4O7, a compound with oxygen absorption/desorption capabilitiesen_AU
dc.typeExternal Reporten_AU
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