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arXiv 1601.02079cond-mat.mtrl-sci
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Mg2Sn的压力增强热电性能

Pressure enhanced thermoelectric properties in Mg2Sn

San-Dong Guo, Jian-Li Wang

摘要:

采用修正的Becke和Johnson(mBJ)交换势,考虑自旋轨道耦合(SOC),研究了$\mathrm{Mg_2Sn}$的电子结构和热电性质与压力的关系.相应的$Γ$点的自旋轨道分裂值为0.47 eV,与实验值0.48 eV相符合。随着压强的增加,能带隙先增大后减小。在一定的掺杂范围内,随着压强的增加,n型功率因数随能带隙的变化趋势相同。计算结果表明,在临界压力以下,压力可以导致n型掺杂的功率因数显著增强,而在临界压力附近,相应的晶格热导率表现出相对较小的值。这些结果使我们相信,$\mathrm{Mg_2Sn}$的热电性能可以改善在n型掺杂的压力。

英文摘要:

Pressure dependence of electronic structures and thermoelectric properties of $\mathrm{Mg_2Sn}$ are investigated by using a modified Becke and Johnson (mBJ) exchange potential, including spin-orbit coupling (SOC). The corresponding value of spin-orbit splitting at $Γ$ point is 0.47 eV, which is in good agreement with the experimental value 0.48 eV. With the pressure increasing, the energy band gap first increases, and then decreases. In certain doping range, the power factor for n-type has the same trend with energy band gap, when the pressure increases. Calculated results show that the pressure can lead to significantly enhanced power factor in n-type doping below the critical pressure, and the corresponding lattice thermal conductivity near the critical pressure shows the relatively small value. These results make us believe that thermoelectric properties of $\mathrm{Mg_2Sn}$ can be improved in n-type doping by pressure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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