Article Dans Une Revue Nature Communications Année : 2025

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

Fabian Garmroudi
Michael Parzer
Alexander Riss
Gerda Rogl

Résumé

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 Fe 2 VAl Heusler compounds. Here, we demonstrate an innovative approach, which bypasses this tradeoff: via liquid-phase sintering, we incorporate the archetypal topological insulator Bi 1− x Sb x between Fe 2 V 0.95 Ta 0.1 Al 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 topologically protected charge transport along the grain boundaries. This yields a huge performance boost, resulting in one of the highest figure of merits among both half- and full-Heusler compounds, z ≈ 1.6 × 10 −3 K −1 ( z T ≈ 0.5) at 295 K. Our findings highlight the potential of topological-insulating secondary phases to decouple charge and heat transport and call for more advanced theoretical studies of multiphase composites.

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hal-05015349 , version 1 (01-04-2025)

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Fabian Garmroudi, Illia Serhiienko, Michael Parzer, Sanyukta Ghosh, Pawel Ziolkowski, et al.. Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks. Nature Communications, 2025, 16 (1), pp.2976. ⟨10.1038/s41467-025-57250-6⟩. ⟨hal-05015349⟩
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