Please use this identifier to cite or link to this item: https://doi.org/10.1039/b301043k
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dc.titleSpectral, magnetic and electrochemical studies of layered manganese oxides with P2 and O2 structure
dc.contributor.authorShaju, K.M.
dc.contributor.authorRamanujachary, K.V.
dc.contributor.authorLofland, S.E.
dc.contributor.authorSubba Rao, G.V.
dc.contributor.authorChowdari, B.V.R.
dc.date.accessioned2014-10-16T09:41:37Z
dc.date.available2014-10-16T09:41:37Z
dc.date.issued2003-10
dc.identifier.citationShaju, K.M., Ramanujachary, K.V., Lofland, S.E., Subba Rao, G.V., Chowdari, B.V.R. (2003-10). Spectral, magnetic and electrochemical studies of layered manganese oxides with P2 and O2 structure. Journal of Materials Chemistry 13 (10) : 2633-2640. ScholarBank@NUS Repository. https://doi.org/10.1039/b301043k
dc.identifier.issn09599428
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/97982
dc.description.abstractX-Ray photoelectron spectroscopy (XPS), infrared spectroscopy and magnetic susceptibility studies were performed on layered O2-phase compounds, Li 2/3(Ni1/3Mn2/3)O2, Li (2/3)+x(Ni1/3Mn2/3)O2, Li 2/3(Co0.15Mn0.85)O2 and Li (2/3)+x(Co0.15Mn0.85)O2 and their respective P2 phases, Na2/3(Ni1/3Mn2/3)O 2 and Na2/3(Co0.15Mn0.85)O 2. The observed electrochemical performance was correlated with the oxidation states of the M ions (M = Mn, Ni, Co). Li(2/3)+x(Ni 1/3Mn2/3)O2 and Li(2/3)+x(Co 0.15Mn0.85)O2 show significant improvement in their first-charge capacity over Li2/3(Ni1/3Mn 2/3)O2 and Li2/3(Co0.15Mn 0.85)O2 when used as cathodes vs. Li. Chemical analysis and XPS data indicate that the incorporation of x ∼ 1/3 in the above two compounds is accompanied by the reduction of a corresponding amount of Mn 4+ to Mn3+ ions in the lattice. The magnetic moments obtained in the paramagnetic region are in fair agreement with the oxidation state of the ions derived from the XPS data for the Ni-system but show deviations for the Co-system. Below 100 K, weak ferrimagnetic ordering is observed in Li(2/3)+x(Ni1/3Mn2/3)O2 and Li(2/3)+x(Co0.15Mn0.85)O2.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1039/b301043k
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1039/b301043k
dc.description.sourcetitleJournal of Materials Chemistry
dc.description.volume13
dc.description.issue10
dc.description.page2633-2640
dc.description.codenJMACE
dc.identifier.isiut000185496500041
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