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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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Thermoelectric material, Zintl phase, SrCuSb

Date published: 2026-05-12

Publisher: American Chemical Society (ACS)

Journal:

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

Funding:

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

Manuscript type: Author's version (Accepted manuscript)

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

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

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Updated at: 2026-07-23 17:15:48 +0900

Published on MDR: 2026-07-23 18:30:03 +0900