Thermoelectric properties of semimetallic (Zr, Hf)CoSb half-Heusler phases
Thermoelectric properties of semimetallic (Zr, Hf)CoSb half-Heusler phases
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DOI：
10.1063/1.1305829
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发表时间：
2000-07
影响因子：
3.2
通讯作者：
Y. Xia;S. Bhattacharya;V. Ponnambalam;A. Pope;S. Poon;T. Tritt
中科院分区：
文献类型：
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作者：
Y. Xia;S. Bhattacharya;V. Ponnambalam;A. Pope;S. Poon;T. Tritt
与半导体 TiCoSb 不同，ZrCoSb 和 HfCoSb half-Heusler 相在室温以下是半金属，并且在 300 K 时表现出 ∼−10 μV/K 的小塞贝克系数。然而，在分别用 Pt 和 Sn 取代（掺杂）Co 和 Sb 位点时，可以获得更大的热电势 (S)。对于 ZrCoSb，S 达到 -110 和 +130 μV/K，而电阻率 ρ 从未掺杂相的 ∼5×104 μΩ cm 降至 300 K 取代相中的 1–2×103 μΩ cm。取代合金在 300 K 时获得的最低热导率为 ∼3.0 W/m K，这是此类结构相中报道的最低热导率之一。有迹象表明这些多元合金的热电性能尚未优化。
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.