Earth abundant element clathrate phases are of interest for a number of applications ranging from photovoltaics to thermoelectrics. Silicon-containing type I clathrate is a framework structure with the stoichiometry A8-xSi46 (A = guest atom such as alkali metal) that can be tuned by alloying and doping with other elements. The type I clathrate framework can be described as being composed of two types of polyhedral cages made up of tetrahedrally coordinated Si: pentagonal dodecahedra with 20 atoms and tetrakaidecahedra with 24 atoms in the ratio of 2:6. The cation sites, A, are found in the center of each polyhedral cage. This review focuses on the newest discoveries in the group 13-silicon type I clathrate family: A8E8Si38 (A = alkali metal; E = Al, Ga) and their properties. Possible approaches to new phases based on earth abundant elements and their potential applications will be discussed.
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机译：从光伏到热电的许多应用中都富含地球元素的包合物相。含硅的I型包合物是化学计量比为A8-xSi46（A =宾原子，例如碱金属）的骨架结构，可以通过合金化和与其他元素掺杂来对其进行调节。 I型笼形骨架可以描述为由两种类型的多面体笼组成，它们由四面体配位的Si组成：具有20个原子的五边形十二面体和具有24个原子的四面体十二面体，其比例为2：6。阳离子位点A位于每个多面体笼的中心。这篇综述着重于13型I型硅笼形族的最新发现：A8E8Si38（A =碱金属； E = Al，Ga）及其性能。将讨论基于地球丰富元素的新阶段的可能方法及其潜在应用。
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