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2015 | 13 | 1 |
Article title

Fabrication and characterization of nanostructured
thermoelectric FexCo1-xSb3

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A novel synthesis route for the fabrication
of p-type nanostructured skutterudite, FexCo1-xSb3
in large quantity is reported. This scalable synthesis route
provides nano-engineered material with less impact on
the environment compared to conventional synthesis
procedures. Several Fe substituted compositions have
been synthesized to confirm the feasibility of the process.
The process consists of a nano-sized precursor fabrication
of iron and cobalt oxalate, and antimony oxides
by chemical co-precipitation. Further thermochemical
processes result in the formation of iron substituted
skutterudites. The nanopowders are compacted by Spark
Plasma Sintering (SPS) technique in order to maintain
nanostructure. Detailed physicochemical as well as
thermoelectric transport properties are evaluated. Results
reveal strongly reduced thermal conductivity values
compared to conventionally prepared counterparts, due
to nanostructuring. P-type characteristic was observed
from the Seebeck measurements while electrical
conductivity is high and shows metallic behavior.
The highest TE figure of merit of 0.25 at 800 K has been
achieved, which is strongly enhanced with respect to the
mother compound CoSb3. This suggests the promise of
the utilized method of fabrication and processing for TE
applications with improved performance.

Physical description
13 - 8 - 2014
30 - 12 - 2014
7 - 4 - 2014
  • Department of Materials and Nano Physics, KTH Royal Institute of
    Technology, Isafjordsgatan 22, SE16440, Kista-Stockholm, Sweden
  • Department of Materials and Nano Physics, KTH Royal Institute of
    Technology, Isafjordsgatan 22, SE16440, Kista-Stockholm, Sweden
  • Department of Materials and Nano Physics, KTH Royal Institute of
    Technology, Isafjordsgatan 22, SE16440, Kista-Stockholm, Sweden
  • Department of Materials and Environmental
    Chemistry, Stockholm University, Arrhenius Laboratory, 106 91
    Stockholm, Sweden
  • Fraunhofer-Institut für
    Physikalische Messtechnik IPM, 79110 Freiburg, Germany
  • Fraunhofer-Institut für
    Physikalische Messtechnik IPM, 79110 Freiburg, Germany
  • Department of Materials and Nano Physics, KTH Royal Institute of
    Technology, Isafjordsgatan 22, SE16440, Kista-Stockholm, Sweden
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