Abstract
The nearly single-phase Yb-filled and Te-doped YbxCo4Sb11.5Te0.5 are prepared by microwave, and the skutterudites are further densification by spark plasma sintering. The experimental results show that Yb filling and Te doping further improve the electrical properties and confine the mean free path of phonons, resulting in a significant reduction the lattice thermal conductivity. And the maximum power factor of Yb0.2Co4Sb11.5Te0.5 is 4364.45 μWm−1K−2 at 675 K. Analysis believes that the resonance scattering root from Yb filling and the defect scattering and stress field fluctuation introduced by Te doping can effectively limit the thermal transport performance. In 300∼775 K, the total thermal conductivity of Yb0.2Co4Sb11.5Te0.5 is 2.68∼3.74 Wm−1K − 1, and the maximum ZT is 1.25 at 775 K, revealing Yb filling and Te doping improve the electrical properties and reduce the thermal conductivity of by limiting the mean free path of phonons.
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