Thermoelectric properties and structural instability of type-I clathrate Ba 8Ga 16Sn 30 at high temperatures

Y. Saiga, K. Suekuni, B. Du, T. Takabatake

研究成果: Contribution to journalArticle査読

26 被引用数 (Scopus)


Type-I clathrate Ba 8Ga 16Sn 30 is known as a typical example showing glass-like behavior in the thermal conductivity at low temperatures. We report on thermoelectric properties above room temperature for the p- and n-type single crystals which were grown from Ga-Sn double flux and Sn single flux, respectively. The measurements of electrical resistivity showed hysteretic behaviors when the sample was heated to 600 K. Powder X-ray diffraction analysis indicated that the type-I structure changed to the type-VIII after the sample was heated to 600 K. By using the data of Seebeck coefficient, electrical resistivity, and thermal conductivity, we estimated the dimensionless figure of merit ZT for the type-I Ba 8Ga 16Sn 30. For the p- and n-type samples, the values of ZT reach 0.58 and 0.50 at around 450 K, respectively, which values are approximately half of those for the type-VIII counterparts.

ジャーナルSolid State Communications
出版ステータス出版済み - 10 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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