Low temperature synthesis of layered $Na_xCoO_2$ and $K_xCoO_2$ from NaOH/KOH fluxes and their ion exchange properties

Shivakumar, C and Hegde, MS (2003) Low temperature synthesis of layered $Na_xCoO_2$ and $K_xCoO_2$ from NaOH/KOH fluxes and their ion exchange properties. In: Journal of Chemical Sciences, 115 (5-6). pp. 447-457.

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Abstract

We report a low temperature synthesis of layered $Na_{0.20}CoO_2$ and $K_{0.44}CoO_2$ phases from NaOH and KOH fluxes at 400°C. These layered oxides are employed to prepare hexagonal $HCoO_2$, $Li_xCoO_2$ and Delafossite $AgCoO_2$ phases by ion exchange method. The resulting oxides were characterised by powder X-ray diffraction, X-ray photoelectron spectroscopy, SEM and EDX analysis. Final compositions of all these oxides are obtained from chemical analysis of elements present. $Na_{0.20}CoO_2$ oxide exhibits insulating to metal like behaviour, whereas $AgCoO_2$ is semiconducting.

Item Type:	Journal Article
Publication:	Journal of Chemical Sciences
Publisher:	Indian Academy of Sciences
Additional Information:	The Copyright belongs to Indian Academy of Sciences.
Keywords:	Layered oxides;Ion exchange reaction;Powder X-ray diffraction;NaOH and KOH fluxes
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	09 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/6226

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