Thermal conductivity and dimensionless figure of merit of thermoelectric rhodium oxides measured by a modified harman method

Wataru Kobayashi, W. Tamura, I. Terasaki

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We have developed a modified Harman method to extract the thermoelectric signal using a squared AC current in the presence of Joule heating, and have measured the thermal conductivity and dimensionless figure of merit of single crystals of the layered rhodium oxide Bi 0.78Sr 0.4RhO 3+d and the pseudo-one-dimensional rhodium oxide Ba 1.2Rh 8O 16. We find that these rhodium oxides exhibit a small thermal conductivity of 30 mW/cm K at 200 K and rather large ZT of 0.02 below 200 K. We believe that this method will be a powerful tool for thermal conductivity measurements in sub-millimeter-sized crystals.

    Original languageEnglish
    Pages (from-to)964-967
    Number of pages4
    JournalJournal of Electronic Materials
    Volume38
    Issue number7
    DOIs
    Publication statusPublished - 2009 Jul

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    Keywords

    • Harman method
    • Thermal conductivity
    • Thermoelectric rhodium oxides

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Materials Chemistry

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