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Thermoelectric properties of the half-Heusler phase ScNiSb (space group <i>F</i><inline-formula> <math display="inline"> <semantics> <mover accent="true"> <mn>4</mn> <mo>&#175;</mo> </mover> </semantics> </math> </inline-formula>3<i>m</i>) 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&#8722;950 K. The material appeared as a <i>p</i>-type conductor, with a fairly large, positive Seebeck coefficient of about 240 &#956;V K^&#8722;1 near 450 K. Nevertheless, the measured electrical resistivity values were relatively high (83 &#956;&#937;m at 350 K), resulting in a rather small magnitude of the power factor (less than 1 &#215; 10^&#8722;3 W m^&#8722;1 K^&#8722;2) in the temperature range examined. Furthermore, the thermal conductivity was high, with a local minimum of about 6 W m^&#8722;1 K^&#8722;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.