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Thermoelectric properties of semimetallic (Zr, Hf)CoSb half-Heusler phases

Xia, Y. ; Bhattacharya, S. ; Ponnambalam, V. ; Pope, A. L. ; Poon, S. J. ; Tritt, T. M.

Journal of applied physics, 2000-08, Vol.88 (4), p.1952-1955 [Periódico revisado por pares]

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Título:
Thermoelectric properties of semimetallic (Zr, Hf)CoSb half-Heusler phases
Autor: Xia, Y. ; Bhattacharya, S. ; Ponnambalam, V. ; Pope, A. L. ; Poon, S. J. ; Tritt, T. M.
É parte de: Journal of applied physics, 2000-08, Vol.88 (4), p.1952-1955
Descrição: Unlike semiconducting TiCoSb, ZrCoSb and HfCoSb half-Heusler phases are semimetallic below room temperature and exhibit small Seebeck coefficients of ∼−10 μV/K at 300 K. However, upon substituting (doping) the Co and Sb sites with Pt and Sn, respectively, much larger thermopowers (S) are obtained. For ZrCoSb, S reaches −110 and +130 μV/K while resistivity ρ decreases from ∼5×104 μΩ cm in the undoped phase to 1–2×103 μΩ cm in the substituted phases at 300 K. The lowest thermal conductivity obtained in the substituted alloys is ∼3.0 W/m K at 300 K, which is among the lowest reported for this class of structural phases. There are indications that the thermoelectric properties have not been optimized in these multinary alloys.
Idioma: Inglês

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