Microstructure Optimization of Thermoelectric τ₁-Al₂Fe₃Si₃ via Graded Temperature Heat Treatments.

ABSTRACT: To investigate the relationship between microstructure, chemical composition, and thermoelectric properties, we have applied graded temperature heat treatments to recently developed τ₁-Al₂Fe₃Si₃-based thermoelectric (FAST) materials formed by a peritectic reaction. We investigated microstructures, chemical compositions, and Seebeck coefficients as continuous functions of heat treatment temperature. The τ1 phase can become p- and n-type semiconductors without doping by changing the Al/Si ratio. The Seebeck coefficient was maximized, exceeding |S| > 140 μVK^-1 for both p- and n-type materials, by heat treatment at 1173 K for 24 h through microstructural optimization. These results show that combining the graded temperature heat tre

SUBMITTER: Yurishima R 

PROVIDER: S-EPMC11643797 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature