Decoupled charge and heat transport in Fe₂VAl composite thermoelectrics with topological-insulating grain boundary networks.

ABSTRACT: Decoupling charge and heat transport is essential for optimizing thermoelectric materials. Strategies to inhibit lattice-driven heat transport, however, also compromise carrier mobility, limiting the performance of most thermoelectrics, including Fe₂VAl Heusler compounds. Here, we demonstrate an innovative approach, which bypasses this tradeoff: via liquid-phase sintering, we incorporate the archetypal topological insulator Bi_1-xSb_x between Fe₂V_0.95Ta_0.1Al_0.95 grains. Structural investigations alongside extensive thermoelectric and magneto-transport measurements reveal distinct modifications in the microstructure, a reduced lattice thermal conductivity and a simultaneously enhanced carrier mobility arising from to

SUBMITTER: Garmroudi F 

PROVIDER: S-EPMC11947127 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature