Cobalt charge states in sodium cobaltates at intermediate dopings

A likely crucial parameter in explaining the peculiar magnetism of Na x CoO 2 cobaltates in their paramagnetic state is their charge and spin states in the cobalt layers, responsible for the electronic properties. We examine here the situation for 0.50 ≤ x ≤ 0.62, for which it is shown that an incre...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-07, Vol.480 (1), p.144-146
Main Authors: Lang, G., Bobroff, J., Alloul, H., Mukhamedshin, I., Collin, G., Blanchard, N.
Format: Article
Language:English
Subjects:
Alloys
Charge
Cobalt
Electronic properties
Links
Magnetism
Nuclear resonances
Phase diagrams
Sodium
Transition metal alloys and compounds
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Summary:A likely crucial parameter in explaining the peculiar magnetism of Na x CoO 2 cobaltates in their paramagnetic state is their charge and spin states in the cobalt layers, responsible for the electronic properties. We examine here the situation for 0.50 ≤ x ≤ 0.62, for which it is shown that an increasing amount of Co 3+ ions appears among ∼3.5+ ions for increasing x. Together with our previous results, this defines two regions in the phase diagram, with homogeneous Co states for x ≤ 0.5 and heterogeneous states for x > 0.5. The links with the sodium structural ordering and the nature of magnetism are discussed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2008.09.167