Synthesis and Thermoelectric Properties of Type-I Clathrate Compounds Si46-xPxTe8

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概要

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• Tellurium-containing cationic clathrates Si46-xPxTe8 ($x = 11--17$) were synthesized using powder metallurgy. This study crystallized the $Pm\bar{3}n$ (No. 223) structure and showed a $ p$-type conductivity; their band gap energy is estimated to be 1.24 eV. Although the Si46-xPxTe8 samples with $x = 16$ and 17 were intrinsic, the samples with $x = 11--15$ were degenerated semiconductors; their electrical conductivity $\sigma$ increased and their Seebeck coefficient $S$ almost decreased with decreasing $x$. A power factor $S^{2}\sigma$ of 12 μW cm-1 K-2 at 1000 K and a dimensionless figure of merit $\mathit{ZT}$ of 0.45 at 900 K were achieved for a $ p$-type silicon clathrate Si33P13Te8.

• Japan Society of Applied Physicsの論文
• 2007-08-25

著者

• Akai Koji

  Media And Information Technology Center Yamaguchi University

• MATSUURA Mitsuru

  Yamaguchi Study Center, The Open University of Japan

• Kishimoto Kengo

  Graduate School Of Science And Engineering Yamaguchi University

• Koyanagi Tsuyoshi

  Graduate School Of Science And Engineering Yamaguchi University

• Matsuura Mitsuru

  Yamaguchi Study Center, The Open University of Japan, Sanyo-Onoda, Yamaguchi 756-0884, Japan

• Akai Koji

  Media and Information Technology Center, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan

• Kishimoto Kengo

  Graduate School of Science and Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan

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• Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba_8Ga_Sn_
• Crystal structure and thermoelectric properties of K_xBa_{8-x}Zn_yGe_{46-y} clathrates
• Synthesis and Thermoelectric Properties of Type-I Clathrate Compounds Si46-xPxTe8

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