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

Wei, Kaya; Zeng, Xiaoyu; Tritt, Terry; Khabibullin, Artem; Woods, Lilia; Nolas, George

doi:10.3390/ma9090732

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

Journal Article · Fri Aug 26 00:00:00 EDT 2016 · Materials

DOI:https://doi.org/10.3390/ma9090732· OSTI ID:2500403

Wei, Kaya; Zeng, Xiaoyu; Tritt, Terry; Khabibullin, Artem; ; Nolas, George

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.

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Research Organization:: Univ. of South Florida, Tampa, FL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER46145

OSTI ID:: 2500403

Alternate ID(s):: OSTI ID: 1361383

Journal Information:: Materials, Journal Name: Materials Journal Issue: 9 Vol. 9; ISSN MATEG9; ISSN 1996-1944

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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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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