Abstract
Lithium-sodium cobaltite LixNayCoO2(x≈y≈0.5) 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 atT≈1000°C are the main features of the LixNayCoO2formation. 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 LiCoO2and γ-Na0.7CoO2. Lattices of the initial phase and formed ones demonstrate mutual orientation.
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