Isovalent substitution effects in the Na layer of y-Na0.75CoO2 thermoelectric oxide

Authors

Germanas Peleckis, University of WollongongFollow
Maarit Karppinen, Tokyo Institute of Technology, Japan
Hisao Yamauchi, Tokyo Institute of Technology, Japan

RIS ID

21839

Publication Details

Peleckis, G, Karppinen, M & Yamauchi, H (2007), Isovalent substitution effects in the Na layer of y-Na0.75CoO2 thermoelectric oxide, Physica C: Superconductivity and its Applications, 460-462(Part 1), pp. 485-486.

Abstract

K and Rb substitution effects in Na layer of Na_0.75CoO₂ oxide are reported. K substitution caused elongation of lattice parameter c, while Rb substituted sample did not have such effect. Transport properties measured showed that all samples are metallic. Rb substitution eliminates characteristic transition point from p- T curves at room temperature. High temperature electrical resistivity measurements revealed, that Rb substitution significantly reduced sodium cation migration in the samples.