Solubility study of Yb in n -type skutterudites Ybx Co4 Sb12 and their enhanced thermoelectric properties

J. Yang, Q. Hao, H. Wang, Y. C. Lan, Q. Y. He, A. Minnich, D. Z. Wang, J. A. Harriman, V. M. Varki, M. S. Dresselhaus, G. Chen, Z. F. Ren

Research output: Contribution to journalArticle

86 Scopus citations

Abstract

The solubility of Yb in Ybx Co4 Sb12 was reported to be 0.19 in bulk skutterudites made by melting and slow cooling method. Surprisingly we increased x close to 0.5 by a special sample preparation method: ball mill and hot press. We show that a higher Yb concentration not only increases the power factor due to a higher electron concentration but also reduces the thermal conductivity k because of stronger phonon scattering. In this way, we have achieved a dimensionless thermoelectric figure of merit ZT of about 1.2 at 550°C in Yb0.35 Co4 Sb12.

Original languageEnglish (US)
Article number115329
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number11
DOIs
StatePublished - Sep 29 2009
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Yang, J., Hao, Q., Wang, H., Lan, Y. C., He, Q. Y., Minnich, A., Wang, D. Z., Harriman, J. A., Varki, V. M., Dresselhaus, M. S., Chen, G., & Ren, Z. F. (2009). Solubility study of Yb in n -type skutterudites Ybx Co4 Sb12 and their enhanced thermoelectric properties. Physical Review B - Condensed Matter and Materials Physics, 80(11), [115329]. https://doi.org/10.1103/PhysRevB.80.115329