Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Garmroudi, Fabian Serhiienko, Illia Parzer, Michael Ghosh, Sanyukta Ziolkowski, Pawel Oppitz, Gregor Nguyen, Hieu Duy Bourgès, Cédric Hattori, Yuya Riss, Alexander Steyrer, Sebastian Rogl, Gerda Rogl, Peter Schafler, Erhard Kawamoto, Naoyuki Müller, Eckhard Bauer, Ernst de Boor, Johannes Mori, Takao |
| author_facet | Garmroudi, Fabian Serhiienko, Illia Parzer, Michael Ghosh, Sanyukta Ziolkowski, Pawel Oppitz, Gregor Nguyen, Hieu Duy Bourgès, Cédric Hattori, Yuya Riss, Alexander Steyrer, Sebastian Rogl, Gerda Rogl, Peter Schafler, Erhard Kawamoto, Naoyuki Müller, Eckhard Bauer, Ernst de Boor, Johannes Mori, Takao |
| contents | 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, and a reduced lattice thermal conductivity and enhanced carrier mobility are simultaneously found. This yields a huge performance boost $-$ far beyond the effective-medium limit $-$ and results in one of the highest figure of merits among both half- and full-Heusler compounds, $z\approx 1.6\times 10^{-3}\,$K$^{-1}$ ($zT\approx 0.5$) at 295 K. Our findings highlight the potential of secondary phases to decouple charge and heat transport and call for more advanced theoretical studies of multiphase composites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_07785 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics Garmroudi, Fabian Serhiienko, Illia Parzer, Michael Ghosh, Sanyukta Ziolkowski, Pawel Oppitz, Gregor Nguyen, Hieu Duy Bourgès, Cédric Hattori, Yuya Riss, Alexander Steyrer, Sebastian Rogl, Gerda Rogl, Peter Schafler, Erhard Kawamoto, Naoyuki Müller, Eckhard Bauer, Ernst de Boor, Johannes Mori, Takao Materials Science 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, and a reduced lattice thermal conductivity and enhanced carrier mobility are simultaneously found. This yields a huge performance boost $-$ far beyond the effective-medium limit $-$ and results in one of the highest figure of merits among both half- and full-Heusler compounds, $z\approx 1.6\times 10^{-3}\,$K$^{-1}$ ($zT\approx 0.5$) at 295 K. Our findings highlight the potential of secondary phases to decouple charge and heat transport and call for more advanced theoretical studies of multiphase composites. |
| title | Decoupled charge and heat transport for high-performance Fe$_2$VAl composite thermoelectrics |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.07785 |