Gibbs Adsorption and Zener Pinning Enable Mechanically Robust High-Performance Bi₂ Te₃ -Based Thermoelectric Devices.

ABSTRACT: Bi₂ Te₃ -based alloys have great market demand in miniaturized thermoelectric (TE) devices for solid-state refrigeration and power generation. However, their poor mechanical properties increase the fabrication cost and decrease the service durability. Here, this work reports on strengthened mechanical robustness in Bi₂ Te₃ -based alloys due to thermodynamic Gibbs adsorption and kinetic Zener pinning at grain boundaries enabled by MgB₂ decomposition. These effects result in much-refined grain size and twofold enhancement of the compressive strength and Vickers hardness in (Bi_0.5 Sb_1.5 Te₃ )_0.97 (MgB₂ )_0.03 compared with that of traditional powder-metallurgy-derived Bi

SUBMITTER: Zhang C 

PROVIDER: S-EPMC10502665 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature