Phase formation and phase stability of KMnO4-treated (Na,K)CoO2.yH2O

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dc.creatorLiu, Chia-Jyi
dc.creatorLiao, C. -Y.
dc.creatorNeeleshwar, S.
dc.creatorChen, Y. -Y.
dc.creatorLiu, Chia-Jung Charlie
dc.date2004-07-16
dc.date2007-05-11
dc.date.accessioned2026-07-07T08:00:45Z
dc.date.available2026-07-07T08:00:45Z
dc.descriptionWe have first used the aquesous KMnO4 solutions to de-intercalate and oxideze gamma-phase of Na0.7CoO2 and successfully form the superconductive phase of cobalt oxyhydrate hydrates (Na,K)xCoO2.yH2O with Tc=3.2-4.6K based on the magnetization measurements. The higher molar ratio of KMnO4/Na used to treat Na0.7CoO2 results in more removal of Na+ and leads to a partial or even complete replacement of K+ for Na+. The low molar ratio of KMnO4/Na forms a superconductive phase with the c-axis ca. 19.6 angstrom, whereas the high molar ratio of KMnO4/Na forms a non-superconductive phase with teh c-axis ca. 13.9 angstrom. The superconductive 19.6 angstrom phase is unstable with respect to the ambient air in terms of losing water molecule from the structure; nevertheless, the dehydration/hydration process is reversible when storing the sample in a chamber with sufficient humidity.
dc.description7 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0407420
dc.identifierhttp://arxiv.org/abs/cond-mat/0407420
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/128745
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titlePhase formation and phase stability of KMnO4-treated (Na,K)CoO2.yH2O
dc.typetext

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