Phase formation and magnetotransport of alkali metal doped Na0.75CoO2 thermoelectric oxide

Authors

Priyanka Jood, University of WollongongFollow
Germanas Peleckis, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow
S X. Dou, University of WollongongFollow
H Yamauchi, Helsinki University of Technology Finland
M Karppinen, Helsinki University of Technology Finland

RIS ID

32919

Publication Details

Jood, P, Peleckis, G, Wang, P, Dou, SX, Yamauchi, H, & Karppinen, M (2010), Phase formation and magnetotransport of alkali metal doped Na_0.75CoO₂ thermoelectric oxide, Journal of Applied Physics, 107(9), pp. 1-3.

Abstract

Synthesis and characterization of bulk Na_xCoO₂ samples substituted by K and Rb is reported. Phase formation studies revealed a narrow stable region for Na-alkali metal-Co system. Whisker and platelike single crystalline structures have been found to form on the surface of the pellets in case of K doping. All samples were metallic and no characteristic anomaly in R-T curves was observed for Rb doped sample. Magnetoresistance measured has a pronounced positive response only for K-doped and pure Na_xCoO₂ phases, reaching 11% and 7% at 5 K temperature, respectively.