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We report the formation of novel complex intermetallics in Al-Pd-W-Fe alloys with varying icosahedral orders. The quaternary system is akin to the Al-Pd-Cr-Fe and Al-Pd-Mo-Fe systems, in which high-order periodic approximants associated with the face-centred icosahedral quasicrystal, i-Al70Pd20Mn10, have been previously reported. Herein, an analogous high-order periodic approximant is identified at compositions of Al67–68Pd24W1–2Fe6–9, along with an icosahedral quasicrystal at approximately Al69Pd22W3Fe6. For the periodic approximant, millimetre-sized single grains were successfully obtained through slow cooling method combined with a post isothermal treatment at a sub-melting temperature. To our surprise, single grains annealed at 1223 K and 1248 K showed different crystal symmetries, suggesting a structural phase transition analogous to one observed in the corresponding approximant of the Al70Pd21Mo1Fe8 alloy. High-quality monophase samples of all three phases, with varying icosahedral orders, were obtained using several heuristic approaches. These monophase samples were finally subjected to a comparative assessment of their thermoelectric properties, which reveal contrasting behaviour associated with the position and shape of the pseudogap at the Fermi level.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Quasicrystal, Thermoelectric materials

刊行年月日: 2025-01-26

出版者: Elsevier BV

掲載誌:

• Journal of Alloys and Compounds (ISSN: 09258388) vol. 1016 178838

研究助成金:

• Core Research for Evolutional Science and Technology JPMJCR2203
• Japan Science and Technology Agency
• Japan Society for the Promotion of Science JP19H05819

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.jallcom.2025.178838

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更新時刻: 2025-04-02 16:30:28 +0900

MDRでの公開時刻: 2025-04-02 17:21:13 +0900