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説明:

A co-doping approach is implemented by substituting In and Bi for Sb in SrCuSb, thereby simultaneously tuning carrier transport and enhancing phonon scattering. Polycrystalline samples synthesized by melting, ball milling, and spark plasma sintering shows that In adjusts the hole concentration and preserves high mobility. At the same time, Bi introduces mass/strain-field disorder that softens the lattice and thereby suppresses lattice thermal conductivity. Co-doping also suppresses the formation of secondary phases, improving phase purity and carrier mobility. The optimized composition exhibits a high power-factor of ~1.9 mW/m·K2 and a low lattice thermal conductivity of ~ 0.54 W/m·K at 773 K, yielding a peak zT of ~0.65. The average zT over 300–773 K increases from 0.17 for pristine SrCuSb to 0.32, corresponding to an ~87 % enhancement.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Thermoelectric material, Zintl phase, SrCuSb

刊行年月日: 2026-05-12

出版者: American Chemical Society (ACS)

掲載誌:

• Chemistry of Materials (ISSN: 15205002) vol. 38 issue. 9 p. 4682-4694

研究助成金:

• Japan Society for the Promotion of Science 24K00590
• Japan Society for the Promotion of Science 24K21692
• Japan Science and Technology Corporation JPMJMI19A1

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6422

公開URL: https://doi.org/10.1021/acs.chemmater.6c00198

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更新時刻: 2026-07-23 17:15:48 +0900

MDRでの公開時刻: 2026-07-23 18:30:03 +0900