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arXiv · 1901.08399

Effect of secondary LuNiSn phase on thermoelectric properties of half-Heusler alloy LuNiSb

Karol Synoradzki·Kamil Ciesielski·Leszek Kępiński·Dariusz Kaczorowski
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Abstract

We report on the high-temperature (350 K <T< 1000 K) thermoelectric properties of the ternary compounds LuNiSb (cubic) and LuNiSn (orthorhombic) and a composite material (LuNiSb)$_{0.5}$(LuNiSn)$_{0.5}$. The electrical conductivity in LuNiSn is metallic, while it is semiconducting-like in LuNiSb. The Seebeck coefficient reaches -5.5 $\mu$V/K at 700 K for the former compound and 66 $\mu$V/K at 607 K for the latter one. The composite sample (LuNiSb)$_{0.5}$(LuNiSn)$_{0.5}$ constructed from orthorhombic matrix with cubic inclusions combines the electrical conductivity of LuNiSn with the thermoelectric properties of LuNiSb. Nonetheless, no enhancement of the thermoelectric performance occurs for this material.

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Karol Synoradzki, Kamil Ciesielski, Leszek Kępiński, Dariusz Kaczorowski. 2019-01-24. Effect of secondary LuNiSn phase on thermoelectric properties of half-Heusler alloy LuNiSb. https://doi.org/10.1016/j.matpr.2019.02.055

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