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Journal of Electronic Materials

, Volume 45, Issue 3, pp 1840–1845 | Cite as

Chemical and Thermoelectric Properties of Hot Pressed and Spark Plasma Sintered Type-I Clathrate Ba8Cu4.8Si41.2

  • X. YanEmail author
  • S. Populoh
  • A. Weidenkaff
  • P. Rogl
  • S. Paschen
Open Access
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Abstract

Nanostructuring has been considered as an effective way to reduce the thermal conductivity and enhance the thermoelectric performance in different material systems. Here, we present the chemical and thermoelectric properties of the nanostructured bulk type-I clathrate Ba8Cu4.8Si41.2. The samples were prepared by consolidating ball-milled nanopowders either by hot pressing or by spark plasma sintering. Fine powders and high sintering temperatures are needed to reach a high bulk density and high thermoelectric performance in the sintered samples. The highest ZT of 0.3 at 870 K is achieved in the most dense sample sintered at 800°C by hot pressing. Further improvement is expected if smaller grain sizes could be stabilized.

Keywords

Thermoelectric materials clathrates hot pressing spark plasma sintering 

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Copyright information

© The Author(s) 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • X. Yan
    • 1
    Email author
  • S. Populoh
    • 2
  • A. Weidenkaff
    • 2
  • P. Rogl
    • 3
  • S. Paschen
    • 1
  1. 1.Institute of Solid State PhysicsVienna University of TechnologyViennaAustria
  2. 2.Laboratory for Solid State Chemistry and CatalysisEMPA -Swiss Federal Laboratories for Materials Science and TechnologyDübendorfSwitzerland
  3. 3.Institute of Physical ChemistryVienna UniversityViennaAustria

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