| Summary: | Half-Heusler alloys are among the most promising thermoelectric materials. In the present review, thermoelectric properties (at 300 K and 800 K) of more than 1100 compositions from more than 220 publications between 1998 and 2023 were collected and evaluated. The dependence of the peak figure of merit, <i>ZT</i><sub>max</sub>, of p- and n-type half-Heusler alloys on the publishing year and the peak temperature is displayed in several figures. Furthermore, plots of <i>ZT</i> vs. the electrical resistivity, the Seebeck coefficient and the thermal conductivity at 300 K and 800 K are shown and discussed. Especially thermal conductivity vs. power factor leads to a good overview of <i>ZT</i>. For both p- and n-type individually separated into systems, <i>ZT</i>s and peak <i>ZT</i>s in dependence on the composition are displayed and discussed. This overview can help to find the ideal half-Heusler alloy for practical use.
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