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

Karol Synoradzki; Kamil Ciesielski; Leszek Kępiński; Dariusz Kaczorowski

doi:10.1016/j.matpr.2019.02.055

paper

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

arXiv:1901.08399 · doi:10.1016/j.matpr.2019.02.055

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 $μ$ V/K at 700 K for the former compound and 66 $μ$ 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.

5 pages, 3 figures. Subbmited to Materials Today: Proceedings, 15th European Conference on Thermoelectrics (ECT2017)