Na-Co系酸化物の仮焼成における結晶組成と熱電特性 Cation ratio of Na-Co system oxides formed in calcination process and thermoelectric properties
The products of Na-Co-system oxides were prepared using Na<sub>2</sub>CO<sub>3</sub>, Co<sub>3</sub>O<sub>4</sub> and other ingredient powders by calcination process. Particular interest is dedicated to the composition of the powder crystals as been formed by the calcination process. It has been found that the composition of the powder crystals always results in Na<sub>x</sub>Co<sub>2</sub>O<sub>y</sub> crystals regardless of the nominal composition, where <i>x</i> is a little above 1.3. For calcination powders of other concentrations, Na-oxides or Co-oxides have been found to remain as contamination, which then cause a decrease in thermoelectric performance.
- Journal of advanced science
Journal of advanced science 14(3), 105-109, 2002-11-30
Society of Advanced Science