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Journal of Materials Science

, Volume 51, Issue 13, pp 6117–6132 | Cite as

Co x Ni4−x Sb12−y Sn y skutterudites: processing and thermoelectric properties

  • Jon MackeyEmail author
  • Frederick Dynys
  • Bethany M. Hudak
  • Beth S. Guiton
  • Alp Sehirlioglu
Original Paper

Abstract

N-type and p-type skutterudite samples with the composition Co x Ni4−x Sb12−y Sn y were synthesized with composition range 0 < x < 2 and 3 < y < 5. Samples were pre-processed by solidification into ingots. Skutterudite phase formation was achieved by mechanical alloying the crushed ingots. The milled powders were consolidated to dense pellets by hot pressing. Thermoelectric measurements showed limited high-temperature performance below 400 °C. Skutterudite decomposition above 250 °C was detrimental to Seebeck coefficient. The thermoelectric transport properties can be tuned by varying the Co and Sn level. The lowest lattice thermal conductivity measured was 1.0 W m−1 K−1 for the Co level of 1.5. The Seebeck coefficient was positive for Co levels >0.8 and negative otherwise. Seebeck coefficients were low, ranging from −40 to 58 µV K−1. The combination of transmission electron microscopy with electron energy loss spectroscopy and powder X-ray diffraction established that Sn can substitute on 2a and 24g sites in the skutterudite structure. Due to the low Seebeck coefficients, the alloys exhibited low figure of merits (ZT) <0.05.

Keywords

Seebeck Coefficient Lattice Thermal Conductivity Total Thermal Conductivity NiSb Skutterudite Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors would like to thank Ben Kowalski, Tom Sabo, Serene Farmer, Ray Babuder, and Dereck Johnson from NASA Glenn Research Center and Case Western Reserve University for help with the experimental portion of this work. The authors would also like to thank Sabah Bux and Jean-Pierre Fleurial from NASA JPL for helpful discussions and assistance with hot pressing some samples. This research was supported in part by the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy. Funding for this work was provided by funding source NASA/USRA 04555-004, the NASA Radioisotope Power System Program, and by NASA Kentucky under NASA Award No: NNX10AL96H.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Materials Science and EngineeringCase Western Reserve UniversityClevelandUSA
  2. 2.NASA Glenn Research CenterClevelandUSA
  3. 3.Department of ChemistryUniversity of KentuckyLexingtonUSA
  4. 4.Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeUSA

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