Enhanced Thermoelectric Properties of Melt-Spun p-Type Yb0.9Fe3CoSb12

Geonsik Son; Kyu Hyoung Lee; Soon Mok Choi

doi:10.1007/s11664-016-4991-6

Enhanced Thermoelectric Properties of Melt-Spun p-Type Yb_0.9Fe₃CoSb₁₂

Geonsik Son, Kyu Hyoung Lee, Soon Mok Choi

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

We herein report an enhancement of the thermoelectric properties of p-type Yb_0.9Fe₃CoSb₁₂ skutterudite by melt spinning combined with spark plasma sintering (SPS). By thermal aging (873 K for 120 h) of the starting Yb_0.9Fe₃CoSb₁₂ 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⁻¹ K⁻² at 723 K) is increased, benefiting from an enhancement of the electrical conductivity due to the elimination of the secondary phase CoSb₂ 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.

Original language	English
Pages (from-to)	2839-2843
Number of pages	5
Journal	Journal of Electronic Materials
Volume	46
Issue number	5
DOIs	https://doi.org/10.1007/s11664-016-4991-6
Publication status	Published - 2017 May 1

Bibliographical note

Funding Information:
This study was supported by the Industrial Fundamental Technology Development Program (10052977) of the Ministry of Trade, Industry and Energy (MOTIE) of Korea.

Publisher Copyright:
© 2016, The Minerals, Metals & Materials Society.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1007/s11664-016-4991-6

Cite this

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title = "Enhanced Thermoelectric Properties of Melt-Spun p-Type Yb0.9Fe3CoSb12 ",

abstract = "We herein report an enhancement of the thermoelectric properties of p-type Yb0.9Fe3CoSb12 skutterudite by melt spinning combined with spark plasma sintering (SPS). By thermal aging (873 K for 120 h) of the starting Yb0.9Fe3CoSb12 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−1 K−2 at 723 K) is increased, benefiting from an enhancement of the electrical conductivity due to the elimination of the secondary phase CoSb2 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.",

author = "Geonsik Son and Lee, {Kyu Hyoung} and Choi, {Soon Mok}",

note = "Funding Information: This study was supported by the Industrial Fundamental Technology Development Program (10052977) of the Ministry of Trade, Industry and Energy (MOTIE) of Korea. Publisher Copyright: {\textcopyright} 2016, The Minerals, Metals & Materials Society.",

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N1 - Funding Information: This study was supported by the Industrial Fundamental Technology Development Program (10052977) of the Ministry of Trade, Industry and Energy (MOTIE) of Korea. Publisher Copyright: © 2016, The Minerals, Metals & Materials Society.

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N2 - We herein report an enhancement of the thermoelectric properties of p-type Yb0.9Fe3CoSb12 skutterudite by melt spinning combined with spark plasma sintering (SPS). By thermal aging (873 K for 120 h) of the starting Yb0.9Fe3CoSb12 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−1 K−2 at 723 K) is increased, benefiting from an enhancement of the electrical conductivity due to the elimination of the secondary phase CoSb2 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.

AB - We herein report an enhancement of the thermoelectric properties of p-type Yb0.9Fe3CoSb12 skutterudite by melt spinning combined with spark plasma sintering (SPS). By thermal aging (873 K for 120 h) of the starting Yb0.9Fe3CoSb12 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−1 K−2 at 723 K) is increased, benefiting from an enhancement of the electrical conductivity due to the elimination of the secondary phase CoSb2 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.

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