Solubility study of Yb in n-type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties

Author(s)
Yang, J.; Hao, Qing; Wang, H.; Lan, Y. C.; He, Q. Y.; ... Show more
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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].
Date issued
2009-09
URI
http://hdl.handle.net/1721.1/51009
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
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
ISSN
1550-235X
1098-0121
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