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Journal of Materials Science
Published in: Journal of Materials Science 9/2017

17-01-2017 | Original Paper

Rapid preparation of bulk Al x Yb0.25Co4Sb12 (x = 0, 0.1, 0.2, 0.3) skutterudite thermoelectric materials with high figure of merit ZT = 1.36

Authors: Mohamed Hamid Elsheikh, Mohd Faizul Mohd Sabri, Suhana Mohd Said, Yuzuru Miyazaki, H. H. Masjuki, Dhafer Abdulameer Shnawah, Shuma Naito, Mohamed Bashir Ali Bashir

Published in: Journal of Materials Science | Issue 9/2017

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Abstract

In this work, a skutterudite-based compound, Yb0.25Co4Sb12, added with Al x (x = 0, 0.1, 0.2, 0.3) was synthesized with a simple mechanical alloying technique followed by spark plasma sintering. The microstructural properties and thermoelectric properties of the as-sintered samples were investigated. The Al atoms formed AlSb nano-inclusions in the grain boundaries instead of entering the Sb-icosahedral voids, introducing point defects in the matrix lattice. By scattering low-energy electrons, the grain boundaries acted as a potential barrier in simultaneously attaining low electrical resistivity and high Seebeck coefficient. Therefore, Al0.1Yb0.25Co4Sb12 exhibited a high power factor of 4.8 × 10−3 W/m K2 at 377 °C. AlSb of nanometer length enhanced interfacial phonon scattering, thereby significantly reducing the lattice thermal conductivity of Al0.3Yb0.25Co4Sb12 to 0.6 W/m K at 500 K. The Al0.3Yb0.25Co4Sb12 composite exhibited the highest figure of merit, ZT = 1.36, at 850 K.
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Metadata
Title
Rapid preparation of bulk Al x Yb0.25Co4Sb12 (x = 0, 0.1, 0.2, 0.3) skutterudite thermoelectric materials with high figure of merit ZT = 1.36
Authors
Mohamed Hamid Elsheikh
Mohd Faizul Mohd Sabri
Suhana Mohd Said
Yuzuru Miyazaki
H. H. Masjuki
Dhafer Abdulameer Shnawah
Shuma Naito
Mohamed Bashir Ali Bashir
Publication date
17-01-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 9/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-0772-8

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