Na-site substitution effects of the thermoelectric properties of NaCo_2O_4

T. Kawata, Y. Iguchi, T. Itoh +2

The resistivity and thermopower of Na${}_{1+x}$Co${}_2$O${}_4$ and Na${}_{1.1-x}$Ca${}_x$Co${}_2$O${}_4$ are measured and analyzed. In Na${}_{1+x}$Co${}_2$O${}_4$, whereas the resistivity increases wi…