Thermoelectric Properties of Y-Doped Polycrystalline SrTiO<sub>3</sub>

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  • Obara Haruhiko
    Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yamamoto Atsushi
    Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Lee Chul-Ho
    Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Kobayashi Keizo
    Institute for Structural and Engineering Materials, AIST
  • Matsumoto Akihiro
    Institute for Structural and Engineering Materials, AIST
  • Funahashi Ryoji
    Special Division for Green Life Technology, AIST

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  • Thermoelectric Properties of Y-Doped Polycrystalline SrTiO3

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The thermoelectric properties of Y-doped polycrystalline SrTiO3 (Sr1−xYxTiO3) are measured from 10 K to 900 K. The Y component is doped up to the solubility limit of Sr1−xYxTiO3, x=0.1. The Y-doped polycrystalline samples show a low resistivity, ∼1×10−5 Ω·m and a large absolute value of the Seebeck coefficient, ∼150 μV/K, at room temperature. Consequently, they have a high power factor, 1.2×10−3 W/mK2, defined as PF=S2⁄ρ, where S is the Seebeck coefficient and ρ is the resistivity. Furthermore, we observe a decrease in the thermal conductivity of SrTiO3 due to phonon scattering by the Y dopant.

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