Rapid preparation of bulk AlxYb0.25Co4Sb12 (x = 0, 0.1, 0.2, 0.3) skutterudite thermoelectric materials with high figure of merit ZT = 1.36

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

研究成果: Article査読

19 被引用数 (Scopus)

抄録

In this work, a skutterudite-based compound, Yb0.25Co4Sb12, added with Alx (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.

本文言語English
ページ(範囲)5324-5332
ページ数9
ジャーナルJournal of Materials Science
52
9
DOI
出版ステータスPublished - 2017 5月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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