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arXiv 1111.0527cond-mat.mtrl-sci
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过渡金属硅化物稳定性和热电性质的第一性原理计算

Stability and thermoelectric properties of transition metal silicides from first principles calculations

P. Jund, X. Tao, R. Viennois, C. Colinet, J. -C. Tedenac

摘要:

我们报告了一个从头算研究的稳定性和电子性质的过渡金属硅化物,以研究其潜在的高温热电应用。我们专注于M5Si3(M = Ta,W)族,其在高达约2000 °C下稳定。我们首先研究了这两种化合物的结构稳定性,然后利用电子态密度和莫特定律确定了平衡结构的热电势。我们发现,W5Si3有一个相对较大的热电势,但可能不够热电应用。

英文摘要:

We report an ab-initio study of the stability and electronic properties of transition metal silicides in order to study their potential for high temperature thermoelectric applications. We focus on the family M5Si3 (M = Ta, W) which is stable up to about 2000 °C. We first investigate the structural stability of the two compounds and then determine the thermopower of the equilibrium structure using the electronic density of states and Mott's law. We find that W5Si3 has a relatively large thermopower but probably not sufficient enough for thermoelectric applications.

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