T. Kawata

collaborators

2 papers

cond-mat.str-el1999

Transport Properties in (Na,Ca)Co_2O_4 Ceramics

T. Itoh, T. Kawata, T. Kitajima +1

The resistivity and thermopower of polycrystalline (Na,Ca)Co_2O_4 were measured and analyzed. Both the quantities increase with x, suggesting that the carrier density is decreased…

cond-mat.str-el1999

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…