Thermoelectric properties of single crystalline Ba8Al xSi46-x clathrate

Naoki Mugita, Yusuke Nakakohara, Teruaki Motooka, Ryo Teranishi, Shinji Munetoh

研究成果: ジャーナルへの寄稿Conference article

18 引用 (Scopus)

抄録

We have synthesized single- and poly-crystalline Ba8Al xSi46-x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski(CZ) method in an argon atmosphere. Poly-crystal sample was prepared by arc melting and annealed at 850°C for l00h in an argon atmosphere. The Seebeck coefficients of single- and poly-crystalline Ba8Al12Si34 at 500°C were 44.5 μV/K and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficient depends on carrier concentration, which is related to the aluminum content. The specific electric resistance of the single-crystal sample with 0.49 mΩcm was lower than that of the poly-crystal with 0.95 mΩcm due to the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0×10-4V2/K 2Ωm was higher than that of the poly-crystal sample with 3.0×l0-4V2/K2Ωm at 500°C. It is suggested that single-crystallization is efficient for the thermoelectric property in the Ba8AlxSi46-x system.

元の言語英語
記事番号142007
ジャーナルIOP Conference Series: Materials Science and Engineering
18
発行部数SYMPOSIUM 9C
DOI
出版物ステータス出版済み - 8 31 2011
イベント3rd International Congress on Ceramics, ICC3 - Osaka, 日本
継続期間: 11 14 201011 18 2010

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Seebeck coefficient
Argon
Single crystals
Crystalline materials
Crystals
Crystal growth from melt
Electron scattering
Crystallization
Aluminum
Carrier concentration
Melting

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

これを引用

Thermoelectric properties of single crystalline Ba8Al xSi46-x clathrate. / Mugita, Naoki; Nakakohara, Yusuke; Motooka, Teruaki; Teranishi, Ryo; Munetoh, Shinji.

:: IOP Conference Series: Materials Science and Engineering, 巻 18, 番号 SYMPOSIUM 9C, 142007, 31.08.2011.

研究成果: ジャーナルへの寄稿Conference article

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AU - Munetoh, Shinji

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N2 - We have synthesized single- and poly-crystalline Ba8Al xSi46-x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski(CZ) method in an argon atmosphere. Poly-crystal sample was prepared by arc melting and annealed at 850°C for l00h in an argon atmosphere. The Seebeck coefficients of single- and poly-crystalline Ba8Al12Si34 at 500°C were 44.5 μV/K and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficient depends on carrier concentration, which is related to the aluminum content. The specific electric resistance of the single-crystal sample with 0.49 mΩcm was lower than that of the poly-crystal with 0.95 mΩcm due to the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0×10-4V2/K 2Ωm was higher than that of the poly-crystal sample with 3.0×l0-4V2/K2Ωm at 500°C. It is suggested that single-crystallization is efficient for the thermoelectric property in the Ba8AlxSi46-x system.

AB - We have synthesized single- and poly-crystalline Ba8Al xSi46-x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski(CZ) method in an argon atmosphere. Poly-crystal sample was prepared by arc melting and annealed at 850°C for l00h in an argon atmosphere. The Seebeck coefficients of single- and poly-crystalline Ba8Al12Si34 at 500°C were 44.5 μV/K and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficient depends on carrier concentration, which is related to the aluminum content. The specific electric resistance of the single-crystal sample with 0.49 mΩcm was lower than that of the poly-crystal with 0.95 mΩcm due to the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0×10-4V2/K 2Ωm was higher than that of the poly-crystal sample with 3.0×l0-4V2/K2Ωm at 500°C. It is suggested that single-crystallization is efficient for the thermoelectric property in the Ba8AlxSi46-x system.

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