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Abstract Te-doped Co4Sb11.5Te0.5 materials with nano to micro sized pores are fabricated tactfully by annealing the nano-Co4Sb11.5Te0.5/Co4Sb11.5Te0.5 composites. The annealed samples present a dramatically reduced thermal conductivity due to the… Click to show full abstract
Abstract Te-doped Co4Sb11.5Te0.5 materials with nano to micro sized pores are fabricated tactfully by annealing the nano-Co4Sb11.5Te0.5/Co4Sb11.5Te0.5 composites. The annealed samples present a dramatically reduced thermal conductivity due to the abundant scattering of phonons in a wide wavelength range by the obtained all-scale porous architecture. Meanwhile, the Seebeck coefficient is enhanced for the annealed samples due to the lower carrier concentration. The sample annealed 100 h exhibits an enhanced dimensionless figure of merit of 1.2 at 800 K, increased by 33.7% as compared with that of the dense sample.
Journal Title: Scripta Materialia
Year Published: 2019
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