Single crystallization of Ba8AlxSi46-x clathrate for improvement of thermoelectric properties

Naoki Mugita, Yusuke Nakakohara, Ryo Teranishi, Shinji Munetoh

研究成果: ジャーナルへの寄稿記事

8 引用 (Scopus)

抄録

We have synthesized single-and polycrystal Ba8Al xSi46-x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski method in an argon atmosphere. Polycrystal sample was prepared by arc melting and annealed at 850 °C for 100 h in an argon atmosphere. The Seebeck coefficients of single-and polycrystal Ba8Al12Si34 at 500 °C were 44.5 and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficients depend on carrier concentration, which is related to aluminum content. The electrical resistivity of the single-crystal sample with 0.49 mΩcm was lower than that of the polycrystal sample with 0.95 mΩcm because of the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0 × -10-4 V2/K2Ωm was higher than that of the polycrystal sample with 3.0 × -10-4 V 2/K2Ωm at 500 °C. It is suggested that single crystallization is efficient for improvement of the thermoelectric property in the Ba8AlxSi46-x clathrate.

元の言語英語
ページ(範囲)1857-1860
ページ数4
ジャーナルJournal of Materials Research
26
発行部数15
DOI
出版物ステータス出版済み - 8 14 2011

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clathrates
Polycrystals
Crystallization
polycrystals
Seebeck coefficient
crystallization
Argon
Seebeck effect
Single crystals
Crystal growth from melt
single crystals
Electron scattering
argon
Aluminum
atmospheres
arc melting
Carrier concentration
Czochralski method
Melting
electron scattering

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Single crystallization of Ba8AlxSi46-x clathrate for improvement of thermoelectric properties. / Mugita, Naoki; Nakakohara, Yusuke; Teranishi, Ryo; Munetoh, Shinji.

:: Journal of Materials Research, 巻 26, 番号 15, 14.08.2011, p. 1857-1860.

研究成果: ジャーナルへの寄稿記事

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AB - We have synthesized single-and polycrystal Ba8Al xSi46-x clathrates to compare their thermoelectric properties. Single-crystal sample was prepared by Czochralski method in an argon atmosphere. Polycrystal sample was prepared by arc melting and annealed at 850 °C for 100 h in an argon atmosphere. The Seebeck coefficients of single-and polycrystal Ba8Al12Si34 at 500 °C were 44.5 and 53.0 μV/K, respectively. The Seebeck coefficients of both samples were almost the same because the Seebeck coefficients depend on carrier concentration, which is related to aluminum content. The electrical resistivity of the single-crystal sample with 0.49 mΩcm was lower than that of the polycrystal sample with 0.95 mΩcm because of the reduction of electron scattering. Therefore, the power factor of the single-crystal sample with 4.0 × -10-4 V2/K2Ωm was higher than that of the polycrystal sample with 3.0 × -10-4 V 2/K2Ωm at 500 °C. It is suggested that single crystallization is efficient for improvement of the thermoelectric property in the Ba8AlxSi46-x clathrate.

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