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Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds
Half-Heusler (HH) compounds are among the most promising thermoelectric (TE) materials for large-scale applications due to their superior properties such as high power factor, excellent mechanical and thermal reliability, and non-toxicity. Their only drawback is the remaining-high lattice thermal conductivity. Various mechanisms were reported with claimed effectiveness to enhance the phonon scattering of HH compounds including grain-boundary scattering, phase separation, and electron–phonon interaction. In this work, however, we show that point-defect scattering has been the dominant mechanism for phonon scattering other than the intrinsic phonon–phonon interaction for ZrCoSb and possibly many other HH compounds. Induced by the charge-compensation effect, the formation of Co/4d Frenkel point defects is responsible for the drastic reduction of lattice thermal conductivity in ZrCoSb1−xSnx. Our work systematically depicts the phonon scattering profile of HH compounds and illuminates subsequent material optimizations.
Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds
Half-Heusler (HH) compounds are among the most promising thermoelectric (TE) materials for large-scale applications due to their superior properties such as high power factor, excellent mechanical and thermal reliability, and non-toxicity. Their only drawback is the remaining-high lattice thermal conductivity. Various mechanisms were reported with claimed effectiveness to enhance the phonon scattering of HH compounds including grain-boundary scattering, phase separation, and electron–phonon interaction. In this work, however, we show that point-defect scattering has been the dominant mechanism for phonon scattering other than the intrinsic phonon–phonon interaction for ZrCoSb and possibly many other HH compounds. Induced by the charge-compensation effect, the formation of Co/4d Frenkel point defects is responsible for the drastic reduction of lattice thermal conductivity in ZrCoSb1−xSnx. Our work systematically depicts the phonon scattering profile of HH compounds and illuminates subsequent material optimizations.
Unveiling the phonon scattering mechanisms in half-Heusler thermoelectric compounds
He, Ran (author) / Zhu, Taishan (author) / Wang, Yumei (author) / Wolff, Ulrike (author) / Jaud, Jean-Christophe (author) / Sotnikov, Andrei (author) / Potapov, Pavel (author) / Wolf, Daniel (author) / Ying, Pingjun (author) / Wood, Max (author)
2020
Miscellaneous
Electronic Resource
English
DDC:
690
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Recent progress in half-Heusler thermoelectric materials
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Recent progress in half-Heusler thermoelectric materials
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