Abstract
Thermoelectric properties of the polycrystal NaCo2O4 fabricated by the sinter-forging method were investigated in the temperature range of 300–1060 K in air for high-temperature thermoelectric applications. The thermopower, electrical conductivity and thermal conductivity of the sinter-forged samples were evaluated for the same transport direction, and the highest value of figure-of-merit for the sinter-forged NaCo2O4 was 2.52×10-4 K-1 at 1050 K in air. The measurement was also extended from 300 to 4 K. The microstructure of the NaCo2O4 was observed for the first time with high resolution and the high-angle grain boundary of Na-rich phase and the low-angle grain boundary are presented in this study.
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