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Multiscale Defects as Strong Phonon Scatters to Enhance Thermoelectric Performance in Mg2Sn1–xSbx Solid Solutions
Small Methods ( IF 10.7 ) Pub Date : 2019-07-22 , DOI: 10.1002/smtd.201900412 Jiazhan Xin 1 , Yang Zhang 2 , Haijun Wu 2 , Tiejun Zhu 1 , Tiezheng Fu 1 , Jiajun Shen 1 , Stephen J. Pennycook 2 , Xinbing Zhao 1
Small Methods ( IF 10.7 ) Pub Date : 2019-07-22 , DOI: 10.1002/smtd.201900412 Jiazhan Xin 1 , Yang Zhang 2 , Haijun Wu 2 , Tiejun Zhu 1 , Tiezheng Fu 1 , Jiajun Shen 1 , Stephen J. Pennycook 2 , Xinbing Zhao 1
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Mg2Sn based solid solutions have attracted much research interest due to their high thermoelectric (TE) performance in the mid‐temperature region and abundant constituent elements. Further enhancement of the figure of merit zT lies in the effective reduction of the relatively high lattice thermal conductivity. It has been demonstrated that alloying high content of aliovalent Sb (>10%) in Mg2Si analogue can induce Mg vacancies and dense dislocations to greatly suppress the lattice thermal conductivity. In this work, the strategy is extended to the Sb alloyed Mg2Sn to enhance zT. Detailed microstructure investigations reveal the existence of high density of interstitial clusters. By introducing these nanostructures as the additional phonon scattering sources, the theoretical calculation well match the low experimental lattice thermal conductivity. Superior to the Sb alloyed Mg2Si, relatively high power factor is maintained in the Sb alloyed Mg2Sn and the maximum zT of 0.9 at 750 K is obtained. With simpler chemical composition though, the Mg2Sn1–xSbx (x > 0.1) has comparable TE performance with the Sb alloyed Mg2Si0.4Sn0.6 solid solutions, exhibiting promising potential for practical applications. The present work offers a comprehensive understanding of the effect of aliovalent alloying and concomitant complex microstructure in reducing thermal conductivity and enhancing zT.
中文翻译：
作为强声子散射的多尺度缺陷，可增强Mg2Sn1-xSbx固溶体的热电性能
Mg 2 Sn基固溶体由于其在中温区的高热电（TE）性能和丰富的组成元素而吸引了许多研究兴趣。品质因数zT的进一步提高在于有效降低相对较高的晶格热导率。已经证明，在Mg 2 Si类似物中合金化高铝价锑的含量（> 10％）可以诱导Mg空位和致密位错，从而大大抑制晶格热导率。在这项工作中，该策略扩展到了Sb合金Mg 2 Sn以增强zT。详细的微观结构研究表明，存在高密度的间隙簇。通过引入这些纳米结构作为附加的声子散射源，理论计算与低实验晶格热导率非常匹配。优于Sb合金Mg 2 Si，在Sb合金Mg 2 Sn中保持相对较高的功率因数，并且在750 K时获得的最大zT为0.9。尽管化学成分更简单，但是Mg 2 Sn 1– x Sb x（x > 0.1）具有与Sb合金Mg 2 Si 0.4 Sn 0.6相当的TE性能。固溶体，在实际应用中显示出令人鼓舞的潜力。目前的工作提供了对铝价合金化和伴随的复杂微观结构在降低导热系数和增强zT方面的全面理解。
更新日期：2019-11-18
中文翻译：
作为强声子散射的多尺度缺陷，可增强Mg2Sn1-xSbx固溶体的热电性能
Mg 2 Sn基固溶体由于其在中温区的高热电（TE）性能和丰富的组成元素而吸引了许多研究兴趣。品质因数zT的进一步提高在于有效降低相对较高的晶格热导率。已经证明，在Mg 2 Si类似物中合金化高铝价锑的含量（> 10％）可以诱导Mg空位和致密位错，从而大大抑制晶格热导率。在这项工作中，该策略扩展到了Sb合金Mg 2 Sn以增强zT。详细的微观结构研究表明，存在高密度的间隙簇。通过引入这些纳米结构作为附加的声子散射源，理论计算与低实验晶格热导率非常匹配。优于Sb合金Mg 2 Si，在Sb合金Mg 2 Sn中保持相对较高的功率因数，并且在750 K时获得的最大zT为0.9。尽管化学成分更简单，但是Mg 2 Sn 1– x Sb x（x > 0.1）具有与Sb合金Mg 2 Si 0.4 Sn 0.6相当的TE性能。固溶体，在实际应用中显示出令人鼓舞的潜力。目前的工作提供了对铝价合金化和伴随的复杂微观结构在降低导热系数和增强zT方面的全面理解。
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