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Open AccessArticle

Structure and Transport Properties of Dense Polycrystalline Clathrate-II (K,Ba)16(Ga,Sn)136 Synthesized by a New Approach Employing SPS

1
Department of Physics, University of South Florida, Tampa, FL 33620, USA
2
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
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Author to whom correspondence should be addressed.
Academic Editor: Matt Beekman
Materials 2016, 9(9), 732; https://doi.org/10.3390/ma9090732
Received: 11 July 2016 / Revised: 15 August 2016 / Accepted: 22 August 2016 / Published: 26 August 2016
(This article belongs to the Special Issue Inorganic Clathrate Materials)
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. View Full-Text
Keywords: clathrate; SPS processing; thermoelectrics clathrate; SPS processing; thermoelectrics
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Wei, K.; Zeng, X.; Tritt, T.M.; Khabibullin, A.R.; Woods, L.M.; Nolas, G.S. Structure and Transport Properties of Dense Polycrystalline Clathrate-II (K,Ba)16(Ga,Sn)136 Synthesized by a New Approach Employing SPS. Materials 2016, 9, 732.

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