Abstract
We synthesized n-type CeO2/Co0.97Pd0.03Sb3 composites with nanometric grain sizes by spark plasma sintering in order to promote phonon scattering at the grain boundaries. Powdered samples were initially obtained by ball milling Co0.97Pd0.03Sb3 together with x% (x = 0, 0.5, 1, 2 vol %) of CeO2 nanoparticles. Scanning electron microscopy shows that grains size in the ∼ 200 - 300 nm range are obtained. CeO2/Co0.97Pd0.03Sb3 samples display larger resistivity values in the temperature range [300 – 800K] than the micron-size grains reference material. But the nanosize grains samples also display a larger absolute Seebeck coefficient, possibly arising from electron energy filtering. The lattice thermal conductivity is decreased in nano-Co0.97Pd0.03Sb12 and its room temperature value correlates not only with the grain sizes but also with the amount of CeO2 nanoparticles. This results in an enhanced (+10%) average ZT value in the temperature range [300 – 650K] in nano-Co0.97Pd0.03Sb12 + 2 vol % CeO2.
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