Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Sodium cobalt oxide, also called sodium cobaltate, is any of a range of compounds of sodium, cobalt, and oxygen with the general formula Na xCoO 2 for 0 < x ≤ 1. The name is also used for hydrated forms of those compounds, Na xCoO 2·yH 2O.
The anhydrous compound was first synthesized in the 1970s.[2] It conducts like a metal, and has exceptional thermoelectric properties (for 0.5 ≤ x ≤ 0.75) combining a large Seebeck coefficient with low resistivity, as discovered in 1997 by Ichiro Terasaki's research group.[2] A hydrate form was found to be superconducting below 5 K.[2] The compound, and its manganese analog, could be a cheaper alternative to the analogous lithium compounds.[3]
^Jansen, M.; Hoppe, R. Oxocobaltates of sodium. Zeitschrift fuer Anorganische und Allgemeine Chemie, 1974. 408 (2): 104-106. ISSN 0044-2313.
^ abcBarbara Goss Levi (2003), "Intriguing Properties Put Sodium Cobalt Oxide in the Spotlight". Physics Today, volume 56, issue 8, page 15. doi:10.1063/1.1611341
^T. J. Willis, D. G. Porter, D. J. Voneshen, S. Uthayakumar, F Demmel, M. J. Gutmann, K. Refson, and J. P. Goff (2018) "Diffusion mechanism in the sodium-ion battery material sodium cobaltate". Scientific Reports, volume 8, report 3210. doi:10.1038/s41598-018-21354-5
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