Solubility study of Yb in n-type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties
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Author(s)
Yang, J.
Hao, Qing
Wang, H.
Lan, Y. C.
He, Q. Y.
Minnich, Austin Jerome
Wang, D. Z.
Harriman, J. A.
Varki, V. M.
Dresselhaus, Mildred
Date Issued
September 2009
Journal
Physical Review B
Publisher
American Physical Society
Citation
Yang, J. et al. “Solubility study of Yb in n -type skutterudites Ybx Co4 Sb12 and their enhanced thermoelectric properties.” Physical Review B 80.11 (2009): 115329. (C) 2010 The American Physical Society.
Version
Final published version
Abstract
The solubility of Yb in Yb[subscript x]Co[subscript 4]Sb[subscript 12 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 Yb[subscript 0.35]Co[subscript 4]Sb[subscript 12].
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevB.80.115329
