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Description:

The pursuit of sustainable thermoelectric materials requires the development of cost-effective and efficient compounds derived from earth-abundant elements. Here, we investigate the effects of samarium (Sm) substitution on the thermoelectric performance of SrSi₂ with compo-sitions Sr1-xSmxSi2 (x = 0, 0.05, 0.1, 0.15, and 0.2). Substituting Sm for Sr in SrSi₂ enhances the power factor at low substitution levels, while further substitution leads to a decrease, due to increased carrier scattering and reduced Seebeck coefficient. Introducing Sm substitution enhances phonon scattering through point defects, reducing lattice thermal conductivity. A peak figure of merit (ZT) of ~0.23 at room temperature is achieved for Sr₀.₉₅Sm₀.₀₅Si₂, demonstrating a 35% improvement over undoped SrSi₂. The weighted mobility of ~285 cm2/ V·s and the tailored thermal transport emphasize the role of Sm substitution in modulating both electronic and thermal properties. These findings establish Sr1-xSmxSi2 as a promising candidate for next-generation thermoelectric devices.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Thermoelectric material, silicide, SrSi2

Date published: 2025-12-31

Publisher: Informa UK Limited

Journal:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 26 issue. 1 2551486

Funding:

• JST-Mirai Program JPMJMI19A1
• Japan Society for the Promotion of Science 24K21692
• Japan Society for the Promotion of Science 24K00590

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/14686996.2025.2551486

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Updated at: 2025-11-13 16:30:22 +0900

Published on MDR: 2025-11-13 16:24:25 +0900