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Recently, it has been reported that Hf-substituted Fe(Nb11xHfx)Sb-based p-type half-Heusler compound exhibits exceptionally high thermoelectric (TE) figure of merit zT = 1.5 at 1200K [C. Fu et al.: Nat. Commun. 6 (2015) 8144.]. However, the effect of substitute elements on the TE properties of FeNbSb is still unclear. Here, we synthesized polycrystalline samples of Fe(Nb0.9M0.1)Sb (M = Ti, Zr, Hf ) by arc-melting followed by spark plasma sintering, and examined their high-temperature TE properties. The Ti-substituted sample was nearly single phase while the Zrand Hf-substituted samples contained small amounts of secondary phase. The Ti-substituted sample exhibited the best TE performance. In the present case, Ti is better substituted element than Zr and Hf for enhancement of TE properties of FeNbSb. [doi:10.2320/matertrans.E-M2018806]

materials transactions

Thermoelectric Properties of &lt;i&gt;p&lt;/i&gt;-Type Half-Heusler Compounds FeNb&lt;sub&gt;0.9&lt;/sub&gt;&lt;i&gt;M&lt;/i&gt;&lt;sub&gt;0.1&lt;/sub&gt;Sb (&lt;i&gt;M&lt;/i&gt; = Ti, Zr, Hf)