Low-Temperature Thermoelectric Properties of the Composite Crystal [Ca<sub> 2</sub>CoO<sub> 3.34</sub>]<sub> 0.614</sub>[CoO<sub> 2</sub>]

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  • Miyazaki Yuzuru
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
  • Kudo Kazutaka
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
  • Akoshima Megumi
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
  • Ono Yasuhiro
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
  • Koike Yoji
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
  • Kajitani Tsuyoshi
    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan

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  • Low-Temperature Thermoelectric Properties of the Composite Crystal [Ca2CoO3.34]0.614[CoO2].

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Electric resistivity, thermoelectric power and thermal conductivity of a polycrystalline sample of the composite crystal [Ca2CoO3.34]0.614[CoO2], also known as Ca3Co4O9, have been measured below 300 K. Metallic conductivity accompanied by large thermoelectric power has been observed down to 50 K. At 300 K, the sample exhibits a thermoelectric power of S = 133 μV·K-1, resistivity of ρ = 15 mΩ·cm and thermal conductivity of κ = 9.8 mW·K-1·cm-1. The resulting dimensionless figure of merit becomes ZT300 = 3.5 × 10-2, which is comparable to the value reported for a polycrystalline sample of NaCo2O4, indicating that the title compound is a potential candidate for a thermoelectric material.

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