structure and transport properties of dense polycrystalline clathrate-ii (k,ba)16(ga,sn)136 synthesized by a new approach employing sps

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ID: 178901
2016
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Abstract
Tin clathrate-II framework-substituted compositions are of current interest as potential thermoelectric materials for medium-temperature applications. A review of the literature reveals different compositions reported with varying physical properties, which depend strongly on the exact composition as well as the processing conditions. We therefore initiated an approach whereby single crystals of two different (K,Ba)16(Ga,Sn)136 compositions were first obtained, followed by grinding of the crystals into fine powder for low temperature spark plasma sintering consolidation into dense polycrystalline solids and subsequent high temperature transport measurements. Powder X-ray refinement results indicate that the hexakaidecahedra are empty, K and Ba occupying only the decahedra. Their electrical properties depend on composition and have very low thermal conductivities. The structural and transport properties of these materials are compared to that of other Sn clathrate-II compositions.
Reference Key
wei2016materialsstructure Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Kaya Wei;Xiaoyu Zeng;Terry M. Tritt;Artem R. Khabibullin;Lilia M. Woods;George S. Nolas
Journal Nature Materials
Year 2016
DOI
10.3390/ma9090732
URL
http://www.mdpi.com/1996-1944/9/9/732
Keywords
electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general)

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