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Thermoelectric properties of the half-Heusler phase ScNiSb (space group F 4 ¯ 3 m ) were studied on a polycrystalline single-phase sample obtained by arc-melting and spark-plasma-sintering techniques. Measurements of the thermopower, electrical resistivity, and thermal conductivity were performed in the wide temperature range 2-950 K. The material appeared as a p -type conductor, with a fairly large, positive Seebeck coefficient of about 240 μV K -1 near 450 K. Nevertheless, the measured electrical resistivity values were relatively high (83 μΩm at 350 K), resulting in a rather small magnitude of the power factor (less than 1 × 10 -3 W m -1 K -2 ) in the temperature range examined. Furthermore, the thermal conductivity was high, with a local minimum of about 6 W m -1 K -1 occurring near 600 K. As a result, the dimensionless thermoelectric figure of merit showed a maximum of 0.1 at 810 K. This work suggests that ScNiSb could be a promising base compound for obtaining thermoelectric materials for energy conversion at high temperatures.

Thermal and Electronic Transport Properties of the Half-Heusler Phase ScNiSb