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arXiv 1607.01111cond-mat.mtrl-sci
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橄榄石型Fe2GeCh4(Ch = S,Se,Te)热电性能的预测

Predicted thermoelectric properties of olivine-type Fe2GeCh4 (Ch = S, Se and Te)

Vijay Kumar Gudelli, V Kanchana, G Vaitheeswaran

摘要:

本文采用基于第一性原理密度泛函理论的线性缀加平面波方法研究了橄榄石型Fe_2GeCh_4(Ch = S,Se和Te)的热电性质.使用半局部玻尔兹曼输运方程计算的输运性质揭示了非常高的热电势为S和Se为基础的化合物相比,他们的Te同行。这种高热电势的主要原因是在价带和导带边缘的带的准平坦性质。在室温下,Fe_2GeCh_4的热电势计算值与实验值吻合较好,载流子浓度约为1018- 1019 cm ~(-3)。所有研究的系统显示出在其电导率的各向异性的性质,导致在一个值小于102的顺序沿a轴相比,b轴和c轴。在所研究的化合物中,Fe_2GeS_4和Fe_2GeSe_4是具有良好热电性能的有希望的候选者。

英文摘要:

We present here the thermoelectric properties of olivine-type Fe2GeCh4 (Ch = S, Se and Te) using the linear augmented plane wave method based on first principles density functional calculations. The calculated transport properties using the semi-local Boltzmann transport equation reveal very high thermopower for both S and Se-based compounds compared to their Te counterparts. The main reason for this high thermopower is the quasi-flat nature of the bands at the valence and conduction band edges. The calculated thermopower of Fe2GeCh4 is in good agreement with the experimental reports at room temperature, with the carrier concentration around 1018-1019cm-3. All the investigated systems show an anisotropic nature in their electrical conductivity, resulting in a value less than the order of 102 along the a-axis compared to the b- and c-axes. Among the studied compounds, Fe2GeS4 and Fe2GeSe4 emerge as promising candidates with good thermoelectric performance.

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