Oxidation State of Cobalt in the NaxCoO2-d yH2O Superconductor

Simple item page
dc.creatorKarppinen, Maarit
dc.creatorAsako, Isao
dc.creatorMotohashi, Teruki
dc.creatorYamauchi, Hisao
dc.date2004-02-18
dc.date.accessioned2026-07-07T06:25:45Z
dc.date.available2026-07-07T06:25:45Z
dc.descriptionHere we present results of accurate wet-chemical redox analyses, revealing that the oxidation number of cobalt in the newly discovered CoO2-layer superconductor, NaxCoO2 yH2O (x ~ 0.36, y ~ 1.3) is ~ 3.46. This value is significantly lower than the one (~ 3.64) expected on the basis of the value determined for the Na to Co stoichiometry ratio, x. The "lower-than-expected" value for the Co oxidation state may be alternatively explained by presence of oxygen vacancies or excess protons. Moreover, the result implies that rather than an electron-doped Co(IV) lattice the phase should be considered as a hole-doped Co(III) lattice.
dc.description13 pages, 3 figures, to appear in Chemistry of Materials
dc.identifierhttps://arxiv.org/abs/cond-mat/0402484
dc.identifierhttp://arxiv.org/abs/cond-mat/0402484
dc.identifierChemistry of Materials 16, 1693 (2004)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96916
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleOxidation State of Cobalt in the NaxCoO2-d yH2O Superconductor
dc.typetext

Files

Collections

arXiv