Al-based quasicrystal as a thermoelectric material

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Presentation transcript:

Al-based quasicrystal as a thermoelectric material Thermoelectric figure of merit Seebeck coefficient S Metal: low, Semiconductor: high, Quasicrystal: medium Electrical conductivity σ Metal: high, Semiconductor: low, Quasicrystal: medium Thermal conductivity κ Crystalline: high, Amorphous: low, Quasicrystalline: low Typical properties Bi2Te3 (Conventional material) S: ~200μV/K σ: ~1000/Ωcm κ: ~1W/mK ZT: ~1 Cost: expensive(△Bi, △Te) Band gap: ~0.2eV Al68Ga3Pd20Mn9 Quasicrystal (the highest performance so far*) S: ~90μV/K× σ: ~700/Ωcm△ κ: ~1W/mK◎ ZT: ~0.26△ Cost: still expensive(◎Al, △Ga, △Pd, △Mn) Band gap: ×(pseudo-gap) Key point Electrons and Holes may compensate each other in quasicrystals (like semimetal). How to introduce a narrow band gap? * Y. Takagiwa, T. Kamimura, S. Hosoi, J. T. Okada and K. Kimura, J. Appl. Phys. 104, 073721 (2008).