Charge ordering in charge-compensated $Na_{0.41}CoO_2$ by oxonium ions

Details Charge ordering in charge-compensated $Na_{0.41}CoO_2$ by oxonium ions Charge ordering in charge-compensated $Na_{0.41}CoO_2$ by oxonium ions

2005-01-10

arxiv.org/abs/cond-mat/0501181v2

Solid State Communication 138, 169(2006)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1016/j.ssc.2006.02.037

Charge ordering behavior is observed in the crystal prepared through the immersion of the $Na_{0.41}CoO_2$ crystal in distilled water. Discovery of the charge ordering in the crystal with Na content less than 0.5 indicates that the immersion in water brings about the reduction of the $Na_{0.41}CoO_2$. The formal valence of Co changes from +3.59 estimated from the Na content to +3.5, the same as that in $Na_{0.5}CoO_2$. The charge compensation is confirmed to arise from the intercalation of the oxonium ions as occurred in the superconducting sodium cobalt oxide bilayer-hydrate.\cite{takada1} The charge ordering is the same as that observed in $Na_{0.5}CoO_2$. It suggests that the Co valence of +3.5 is necessary for the charge ordering.

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