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Materials 2016, 9(9), 714; doi:10.3390/ma9090714

Earth Abundant Element Type I Clathrate Phases

Department of Chemistry, One Shields Ave, University of California, Davis, CA 95616, USA
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Academic Editor: Yuri Grin
Received: 6 July 2016 / Revised: 8 August 2016 / Accepted: 15 August 2016 / Published: 23 August 2016
(This article belongs to the Special Issue Inorganic Clathrate Materials)
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Abstract

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. View Full-Text
Keywords: silicon; photovoltaics; thermoelectrics silicon; photovoltaics; thermoelectrics
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Kauzlarich, S.M.; Sui, F.; Perez, C.J. Earth Abundant Element Type I Clathrate Phases. Materials 2016, 9, 714.

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