Microstructural transformation for robust and high-efficiency Zintl thermoelectrics.

ABSTRACT: Thermoelectric materials offer an exceptional opportunity to convert waste heat into electricity directly, yet their widespread application remains hindered by intrinsic brittleness and poor processability. Here, we introduce a graded ball milling strategy that fundamentally enhances the mechanical robustness and processability of YbZn₂Sb₂-based thermoelectrics. By refining grain microstructure, increasing dislocation density, and promoting intermediate-angle grain boundaries, this approach enables the fabrication of crack-free, large-size, disc-shaped, and microscale dices while maintaining excellent thermoelectric performance. Extending this strategy to a broader class of brittle Zintl compounds, including AZn₂Sb₂, AMg₂Sb₂

SUBMITTER: Jiang M 

PROVIDER: S-EPMC12356884 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature