Synthesis of single crystalline silicon clathrate for high performance thermoelectric materials

• Project/Area Number: 24760538
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical properties of metals
• Research Institution: Kyushu University
• Principal Investigator: MUNETOH Shinji 九州大学, 工学(系)研究科(研究院), 准教授 (20380587)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 熱電材料 / クラスレート / ゼーベック係数 / 比抵抗 / 移動度 / パワーファクター

Outline of Final Research Achievements

Single crystalline Ba8AlxSi46-x clathrates were synthesized using by Czochralski method. The power factor of the synthesized single crystal samples showed twice the value of poly-crystalline samples because of the increase of electron mobility by single crystallization. Aluminum-rich single crystalline Ba8AlxSi46-x clathrates were also synthesized from Aluminum-rich melt. We were able to synthesize high performance thermoelectric material with power factor of 1.1×10-3 V2/K2･Ωm. We were able to fabricate an uni-leg thermoelectric module with the maximum output power of 0.13 W.

Research Products

• [Journal Article] Reinvestigation of Thermoelectric Properties of n- and p-Type Ba8－d Au x Si46－x－y Clathrate (2014)
  • Author(s): Shinji Munetoh, Makoto Saisho, Takuya Oka, Toshiko Osada, Hideshi Miura, Osamu Furukimi
  • Journal Title: Journal of Electronic Materials Volume: to be published Issue: 6 Pages: 2430-2434
  • DOI: 10.1007/s11664-014-3118-1
  • Peer Reviewed
• [Journal Article] Thermoelectric Properties of Ga-Doped Ba8Al x Si46－x Clathrate (2014)
  • Author(s): Yusuke Onizuka, Takuya Oka, Toshiko Osada, Hideshi Miura, Shinji Munetoh, Osamu Furukimi
  • Journal Title: Journal of Electronic Materials Volume: 43 Issue: 6 Pages: 2059-2063
  • DOI: 10.1007/s11664-013-2948-6
• [Journal Article] Synthesis and thermoelectric properties of p-type Ba8AuxSi46-x clathrate (2012)
  • Author(s): Makoto Saisho, Liu Bin, Yuya Nagatomo, Yusuke Nakakohara, Ryo Teranishi and Shinji Munetoh
  • Journal Title: Journal of Physics Conference Series Volume: 379 Pages: 12009-12009
  • DOI: 10.1088/1742-6596/379/1/012009
  • Peer Reviewed
• [Journal Article] Thermoelectric properties of single crystalline Ba8AlxSi46-x clathrate by using flux Czochralski method (2012)
  • Author(s): Yuya Nagatomo, Naoki Mugita, Yusuke Nakakohara, Makoto Saisho, Mikihito Tajiri, Ryo Teranishi and Shinji Munetoh
  • Journal Title: Journal of Physics Conference Series Volume: 379 Pages: 12008-12008
  • DOI: 10.1088/1742-6596/379/1/012008
  • Peer Reviewed
• [Journal Article] Annealing Time Dependence on the Phase Equilibria and Thermoelectric Property of Type-I Ba8Cu6Ag2Si38 Clathrate (2012)
  • Author(s): Bin Liu, Makoto Saisho, Yuya Nagatomo, Takuya Oka, Toshiko Osada, Hideshi Miura, Osamu Furukimi, Shinji Munetoh
  • Journal Title: Journal：Applied Mechanics and Materials Volume: 310 Pages: 59-62
  • DOI: 10.4028/www.scientific.net/amm.310.59
  • Peer Reviewed
• [Presentation] Synthesis and Thermoelectric Properties of Polycrystalline Ba8AlXSi46-X Clathrate (2014)
  • Author(s): Hiromitsu Ohnaka, Keisuke Shimonish, Toshiko Osada, Hideshi Miura, Shinji Munetoh, Osamu Furukimi
  • Organizer: The 15th IUMRS-international Conference in Asia
  • Place of Presentation: 福岡大学
  • Year and Date: 2014-08-26
• [Presentation] Thermoelectric Properties of n- and p-Type Ba8 Aux Si46-x Clathrate (2013)
  • Author(s): Shinji Munetoh, Makoto Saisho, Takuya Oka, Toshiko Osada, Hideshi Miura and Osamu Furukimi
  • Organizer: The 32nd International Conference on Thermoelectrics
  • Place of Presentation: 日本、神戸市
• [Presentation] Thermoelectric properties of Ga-doped Ba8 Alx Si46-x clathrate (2013)
  • Author(s): Yusuke Onizuka, Shinji Munetoh, Osamu Furukimi, Takuya Oka, Hideshi Miura and Toshiko Osada
  • Organizer: The 32nd International Conference on Thermoelectrics
  • Place of Presentation: 日本、神戸市
• [Presentation] Structure stability of Ba8 Alx Si46-x clathrates by using first-principles calculations. (2013)
  • Author(s): Takuya Oka, Yuya Nagatomo, Toshiko Osada, Hideshi Miura, Osamu Furukimi and Shinji Munetoh
  • Organizer: The 32nd International Conference on Thermoelectrics
  • Place of Presentation: 日本、神戸市
• [Presentation] Chemical composition of Cu substitution Si based clathrate after annealing (2013)
  • Author(s): Bin Liu , Takuya Oka , Toshiko Osada , Hideshi Miura , Osamu Furukimi and Shinji Munetoh
  • Organizer: The 32nd International Conference on Thermoelectrics
  • Place of Presentation: 日本、神戸市
• [Presentation] Ba8CuxSi46-xクラスレート化合物の熱電性能 (2012)
  • Author(s): 最所 誠、長友雄也、Liu Bin、宗藤伸治、古君 修
  • Organizer: 第九回日本熱電学会学術講演会
  • Place of Presentation: 東京工業大学
• [Presentation] Synthesize of n and p-type thermoelectricmaterials type-I Ba8CuxAgySi46-x-yclathrates by act-melting and annealingmethod (2012)
  • Author(s): Liu Bin、最所 誠、長友雄也、古君 修、宗藤伸治
  • Organizer: 第九回日本熱電学会学術講演会
  • Place of Presentation: 東京工業大学
• [Presentation] CZ法によるBa8AlxSi46-xクラスレートの単結晶作製及び熱電性能評価 (2012)
  • Author(s): 宗藤伸治、長友雄也a)、最所 誠a)、古君 修a)
  • Organizer: 第九回日本熱電学会学術講演会
  • Place of Presentation: 東京工業大学