Abstract
ZrCoSb1−x Sn x (x = 0, 0.1, 0.2, 0.3, 0.35) half-Heusler (HH) samples were prepared by arc melting, ball milling and then hot-pressing. X-ray diffraction analysis results showed that all samples were crystallized in a HH phase. Thermoelectric (TE) properties of ZrCoSb1−x Sn x were measured from room temperature (RT) to 973 K. The Seebeck coefficient changed from negative to positive after substituting Sb with Sn, indicating the occurrence of conduction type transformation in ZrCoSb-based HH compounds. At the same time, the Seebeck coefficient decreased with increasing Sn substitution, and the electrical conductivity increased obviously with Sn addition when x ≤ 0.3. The lattice thermal conductivity of Sn-substituted samples was reduced dramatically because of the stronger phonon scattering by the strain field fluctuation induced by Sn replacement of Sb. Finally, as a result of the Sn substitution, a peak ZT of 0.52 was reached at 973 K in the ZrCoSb0.7Sn0.3 sample.
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Yuan, B., Wang, B., Huang, L. et al. Effects of Sb Substitution by Sn on the Thermoelectric Properties of ZrCoSb. J. Electron. Mater. 46, 3076–3082 (2017). https://doi.org/10.1007/s11664-016-5168-z
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DOI: https://doi.org/10.1007/s11664-016-5168-z