Year: 2003
Type: article
Abstract: Thermoelectric properties of the polycrystal NaCo 2 O 4 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 NaCo 2 O 4 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 NaCo 2 O 4 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.
DOI: 10.1143/jjap.42.7013
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2067014591