Table of Contents
International Journal of Inorganic Chemistry
Volume 2011 (2011), Article ID 649183, 11 pages
http://dx.doi.org/10.1155/2011/649183
Research Article

Studies on Formation and Decomposition of the Layered Cobaltite LixNayCoO2

1Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Science, 620990 Ekaterinburg, Russia
2Institute of Metal Physics, Ural Branch of the Russian Academy of Science, 620041 Ekaterinburg, Russia
3Department of Analitical Chemistry, Institute of Natural Sciences, Ural Federal University named after the First Russian President B. N. Yeltsin, 620002 Ekaterinburg, Russia

Received 23 June 2011; Accepted 6 December 2011

Academic Editor: Rabindranath Mukherjee

Copyright © 2011 A. S. Semenova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Lithium-sodium cobaltite LixNayCoO2 (xy0.5) with ordered layered structure is promising thermoelectric material. Here we report the peculiarities of this phase formation and decomposition processes studied by TG/DTA, XRD, SEM, and TEM methods. Significant weight loss resulting from oxygen liberation and endothermic effect at T1000°C are the main features of the LixNayCoO2 formation. Decomposition of the ordered phase is accompanied by exothermic effect at 940°C and the weight increase. Electron microscopic study shows that the lithium-sodium cobaltite decomposes into LiCoO2 and γ-Na0.7CoO2. Lattices of the initial phase and formed ones demonstrate mutual orientation.