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

P. Jood, G. Peleckis, X.L. Wang, S.X. Dou, H. Yamauchi, M. Karppinen

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    Abstract

    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.
    Original languageEnglish
    Article number09D716
    Pages (from-to)1-3
    JournalJournal of Applied Physics
    Volume107
    Issue number9
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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