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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Enhanced thermoelectric performance of porous magnesium tin silicide prepared using pressure-less spark plasma sintering
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Enhanced thermoelectric performance of porous magnesium tin silicide prepared using pressure-less spark plasma sintering

机译：无压火花等离子体烧结制备的多孔硅化镁锡镁的热电性能增强

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摘要

Magnesium tin silicide based thermoelectrics contain earth abundant and non-toxic elements, and have the potential to replace established commercial thermoelectrics for energy conversion applications. In this work, porosity was used as a means to improve their thermoelectric properties. Compared to dense samples of Sb doped Mg2Si0.5Sn0.5 with a maximum zT of 1.39 at 663 K, porous samples (37% porosity) prepared by a pressure-less spark plasma sintering technique showed significantly lower thermal conductivity and higher Seebeck coefficient, resulting in an increased maximum zT of 1.63 at 615 K. The possible origins of the enhanced Seebeck coefficient can be attributed to a change of carrier concentration and modification of the band structure, produced by microstructural engineering of the surface composition and particle-particle contacts.
机译：基于硅化镁锡的热电元件包含丰富的地球元素和无毒元素，并且有潜力替代已建立的用于能量转换应用的商用热电元件。在这项工作中，孔隙率被用作改善其热电性能的手段。与在663 K下最大zT为1.39的掺杂Sb的Mg2Si0.5Sn0.5的致密样品相比，通过无压火花等离子体烧结技术制备的多孔样品（孔隙度为37％）显示出明显更低的导热率和更高的塞贝克系数，从而在615 K时最大zT值为1.63。提高的塞贝克系数的可能起因可以归因于载流子浓度的变化和能带结构的改变，这是由表面组成和粒子-粒子接触的微结构工程产生的。

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