Two series of p-type polycrystalline skutterudites, Ba0.15YbxCo3FeSb12 and YbyCo3FeSb9As3 with varying Yb concentrations, were synthesized by solid-state reaction and then densified by hot pressing. The phase and stoichiometries of the resulting materials were characterized by powder X-ray diffraction and energy dispersive spectroscopy, while their high-temperature transport properties were investigated from 300 to 800 K. The Seebeck coefficients and electrical resistivities increased linearly with increasing temperature for the double-filled specimens. The Seebeck coefficients and electrical resistivities did not change very much for the As-substituted specimens. The thermal conductivity for all specimens decreased with increasing temperature up to 700 K, corresponding to the plateau in the Seebeck coefficient, and then increased again due to bipolar diffusion. We find that double filling is a more feasible approach to thermoelectric property optimization than single filling with As substitution. © 2014 Springer Science+Business Media New York.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Materials Science|
|State||Published - Aug 28 2014|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Y.D. and G.S.N. gratefully acknowledge support from the National Science Foundation and Department of Energy Partnership on Thermoelectric Devices for Vehicle Applications (Grant no. 1048796). The work in Dr. Tritt's laboratory acknowledges, in part, the support of a KAUST Faculty Initiated Collaboration grant and also some funding from Clemson University.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.