Abstract
Bulk thermoelectric nanocomposite materials have great potential to exhibit higher figure of merit due to effects arising from the nanostructure. In this paper, we report thermoelectric properties from 80 K to 800 K of Co0.9Fe0.1Sb3 based skutterudite nanocomposites containing FeSb2 nanoinclusions. The nanoscale FeSb2 precipitates are well dispersed in the skutterudite matrix and reduce the lattice thermal conductivity due to additional phonon scattering from the nanoscopic interfaces. Moreover, the nanocomposite samples also exhibit enhanced Seebeck coefficients relative to the regular iron substituted skutterudite samples. As a result, our best nanocomposite sample reached a dimensionless figure of merit of 0.59 at 788 K, a factor of two higher than that of the control sample Co0.9Fe0.1Sb3.
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