The Parent of Misfit-Layered Cobalt Oxides: [Sr2O2]qCoO2

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dc.creatorYamauchi, H.
dc.creatorSakai, K.
dc.creatorNagai, T.
dc.creatorMatsui, Y.
dc.creatorKarppinen, M.
dc.date2005-11-18
dc.date.accessioned2026-07-07T06:49:17Z
dc.date.available2026-07-07T06:49:17Z
dc.descriptionMisfit-layered (ML) cobalt oxides of the general formula of [MmA2Om+2]qCoO2 have been proven to be efficient thermoelectric materials as the structure is capable in accommodating the two seemingly contradictory characteristics of high electrical conductivity and large thermo-electric power. They are also potential hosts for other oxymoron-like functions. The known phases all contain one or two square-planar MO (M = Co, Bi, Pb, Tl, etc.) layers sandwiched together with AO (A = Ca, Sr, Ba, etc.) planes of square symmetry and CoO2 layers of hexagonal symmetry. Here we report realization of the simplest (m = 0) ML phase forming in the Sr-Co-O system with the cation ratio, Sr/Co = 1. Atomic-resolution TEM imaging confirms for the new phase the parent three-layer crystal structure, SrO-SrO-CoO2, which is compatible with the formula of [Sr2O2]qCoO2. Electron diffraction reveals that the phase is rather commensurate, i.e. the "misfit parameter" q is 0.5. Nevertheless, in terms of the transport-property characteristics the new ML parent is comparable to its earlier-established and more complex derivatives.
dc.description12 pages, 5 figures, to appear in Chemistry of Materials
dc.identifierhttps://arxiv.org/abs/cond-mat/0511449
dc.identifierhttp://arxiv.org/abs/cond-mat/0511449
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/104281
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleThe Parent of Misfit-Layered Cobalt Oxides: [Sr2O2]qCoO2
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