Pyrochlore lattice system as a high-performance energy conversion material
| Project/Area Number |
16H03848
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Research Collaborator |
Takenaka Koshi
Yamakawa Youichi
Sawa Hiroshi
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2016: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
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| Keywords | 熱電変換材料 / パイロクロア構造 / エネルギー変換材料 / パイロクロア / 熱電変換 / 幾何学的フラストレーション / 熱・エネルギー変換 / 磁場誘起歪 / 熱・エネルギー変換材料 / パイロクロア格子 / 固体冷凍 / フラストレーション / 負熱膨張 / 固体冷凍材料 |
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| Outline of Final Research Achievements |
We studied thermoelectric properties of pyrochlore-lattice systems with transition metal atoms, which are expected to show high thermoelectric performance due to the geometrical frustration, multiple degrees of freedom, and rattling effects. We focused on the b-pyrochlore oxide CsW2O6 and found that this compound has large thermoelectric power as a metallic system and very small thermal conductivity probably coming from the rattling effect. We also found that Ta4SiTe4 and Nb4SiTe4, where one-dimensional chains form a triangular lattice, show excellent thermoelectric performance exceeding the practical level at low temperatures.
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| Academic Significance and Societal Importance of the Research Achievements |
現在、熱電変換は室温付近における赤外線センサーの冷却などの限定された用途でのみ実用化されている。本研究では、CsW2O6やTa4SiTe4といった物質が、熱電変換の幅広い実用に繋がる次世代の熱電変換材料の有力候補であることを見出した。特に、Ta4SiTe4は現在熱電冷却用の材料として唯一実用化されているBi2Te3系材料が利用できないマイナス50℃以下の低温領域で高い性能を示す点でユニークである。低温領域における各種デバイスの局所冷却や、液化天然ガスの冷熱を利用した発電など、これまで実用化されていない様々な用途の実用に道を拓く成果といえる。
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Report
(4 results)
Research Products
(23 results)
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[Presentation] Phase Transition in β-Pyrochlore Oxide CsW2O62017
Author(s)
Yoshihiko Okamoto, Haruki Amano, Kenta Niki, Rikuto Mitoka, Naoyuki Katayama, Hiroshi Sawa, Yuto Nakamura, Hideo Kishida, and Koshi Takenaka
Organizer
International Workshop on Multipole Physics and Related Phenomena
Related Report
Int'l Joint Research
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