Magnesium silicide (Mg₂Si) is one of the few thermoelectric materials that is composed of high Clark number elements and exhibits an optimum temperature near 700 K. The advantage of Mg₂Si is that it is composed of universal elements and can be synthesized at low cost. However, it has the disadvantage of low efficiency in converting heat flow to electricity due to its high thermal conductivity. In this paper, Mg vapor annealing of silica-coated 1,2-polybutadiene honeycomb films enables the formation of a Mg₂Si honeycomb supported by amorphous carbon. The annealing temperature should be greater than 998 K to obtain Mg₂Si honeycombs, and we confirmed through detailed chemical analysis that a silica layer can be converted to a Mg₂Si layer via formation of Si. Furthermore, the honeycomb structure eventually reduced the thermal diffusivity even though only a single layer of the honeycomb structure formed on the surface. The obtained Mg₂Si honeycombs are good candidates for effective and low-cost thermoelectric materials for use in high-temperature applications.

中文翻译：

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二氧化硅包覆的聚合物蜂窝薄膜向超轻质热电材料的镁蒸汽退火制备的高多孔硅化镁蜂窝

硅化镁（Mg的₂ Si）的是由高克拉克数量的元件的几个热电材料中的一种并表现出近700 K.镁的优点最佳温度₂ Si是，它是由万向元件，并且可以在合成低成本。然而，由于其高导热率，其具有将热流转换成电的效率低的缺点。在本文中，对涂有二氧化硅的1,2-聚丁二烯蜂窝膜进行Mg蒸气退火可以形成由无定形碳支撑的Mg ₂ Si蜂窝。为了获得Mg ₂ Si蜂窝，退火温度应高于998 K ，并且我们通过详细的化学分析证实，二氧化硅层可以转化为Mg₂通过形成的Si的Si层。此外，即使仅在表面上形成蜂窝结构的单层，蜂窝结构也最终降低了热扩散率。所得的Mg ₂ Si蜂窝材料是用于高温应用的有效且低成本的热电材料的良好候选材料。