Browsing by Author "Wang, X.L."

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  • Phase formation and magnetotransport of alkali metal doped Na0.75CoO2 thermoelectric oxide
    (2010) Jood, P.; Peleckis, G.; Wang, X.L.; Dou, S.X.; Yamauchi, H.; Karppinen, M.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Synthesis and characterization of bulk NaxCoO2 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 NaxCoO2 phases, reaching 11% and 7% at 5 K temperature, respectively.