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- Title
Enhanced Thermoelectric Properties of Melt-Spun p-Type YbFeCoSb.
- Authors
Son, Geonsik; Lee, Kyu; Choi, Soon-Mok
- Abstract
We herein report an enhancement of the thermoelectric properties of p-type YbFeCoSb skutterudite by melt spinning combined with spark plasma sintering (SPS). By thermal aging (873 K for 120 h) of the starting YbFe CoSb compound for melt spinning, fabricated by conventional melting and quenching, highly dense single phase bulks with reduced grain sizes of ~300 nm are successfully fabricated after SPS. The power factor value of the sample (~3.6 mW m K at 723 K) is increased, benefiting from an enhancement of the electrical conductivity due to the elimination of the secondary phase CoSb during the thermal aging process. In addition, lattice thermal conductivity is significantly decreased due to the reduced grain size, thus intensifying the grain boundary phonon scattering. Through these synergetic effects, the maximum dimensionless figure of merit ZT increases by 25% (0.70 at 723 K) compared to a pristine sample with microscale grains.
- Subjects
THERMOELECTRICITY; SKUTTERUDITE; MELT spinning; SINTERING; PHONON scattering; ELECTRIC conductivity
- Publication
Journal of Electronic Materials, 2017, Vol 46, Issue 5, p2839
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-016-4991-6