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

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  • Thermoelectric Properties of p-Type Half-Heusler Compounds FeNb₀.₉M₀.₁Sb (M = Ti, Zr, Hf)

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Abstract

<p>Recently, it has been reported that Hf-substituted Fe(Nb1−xHfx)Sb-based p-type half-Heusler compound exhibits exceptionally high thermoelectric (TE) figure of merit zT = 1.5 at 1200 K [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 Zr- and 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.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 59 (7), 1030-1034, 2018-07-01

    The Japan Institute of Metals and Materials

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