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                <term xml:lang="en">Cobalt layers</term>
                <term xml:lang="en">Cobalt</term>
                <term xml:lang="en">Cobalt compounds</term>
                <term xml:lang="en">Electronic properties</term>
                <term xml:lang="en">Phase diagrams</term>
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              <p>A likely crucial parameter in explaining the peculiar magnetism of NaxCoO2 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 Co3+ 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 &gt; 0.5. The links with the sodium structural ordering and the nature of magnetism are discussed.</p>
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