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Thermal Conductivity and Dimensionless Figure of Merit of Thermoelectric Rhodium Oxides Measured by a Modified Harman Method

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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 Bi0.78Sr0.4RhO3+d and the pseudo-one-dimensional rhodium oxide Ba1.2Rh8O16. 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.

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Authors and Affiliations

  1. Waseda Institute for Advanced Study, Waseda University, Tokyo, 169-8050, Japan

    W. Kobayashi

  2. Department of Applied Physics, Waseda University, Tokyo, 169-8555, Japan

    W. Tamura & I. Terasaki

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  1. W. Kobayashi
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  2. W. Tamura
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  3. I. Terasaki
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Correspondence to W. Kobayashi.

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Kobayashi, W., Tamura, W. & Terasaki, I. Thermal Conductivity and Dimensionless Figure of Merit of Thermoelectric Rhodium Oxides Measured by a Modified Harman Method. J. Electron. Mater. 38, 964–967 (2009). https://doi.org/10.1007/s11664-009-0788-1

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  • DOI: https://doi.org/10.1007/s11664-009-0788-1

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