Abstract
La and Yb double-filled p-type skutterudites (La1−z Yb z Fe4−x Co x Sb12; 0.25 ≤ z ≤ 0.75 and 0.5 ≤ x ≤ 1) were synthesized by encapsulated melting and homogenized by use of heat treatment. It was apparent from the positive signs of the Seebeck coefficient and the Hall coefficient that all specimens had p-type characteristics. The carrier concentration decreased with charge compensation. The thermal conductivity and the electrical conductivity decreased and the Seebeck coefficient increased with increasing substitution of Co for Fe. However, the carrier concentration was increased by increasing the Yb filling ratio. Electrical conductivity increased and the Seebeck coefficient decreased with increasing Yb filling, because the electron valence of Yb2+ was lower than that of La3+. The thermal conductivity decreased with charge compensation, and the lattice thermal conductivity decreased with increasing Yb filling. Yb was more effective than La at reducing lattice thermal conductivity. The power factor (PF) and dimensionless figure of merit (ZT) increased with increasing temperature up to a specific temperature. The maximum PF = 2.81 mW/mK2 at 823 K was obtained for La0.75Yb0.25Fe3.5Co0.5Sb12 and the maximum ZT = 0.74 at 723 K was achieved for La0.5Yb0.5Fe3CoSb12.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R.H. Liu, J. Yang, X.H. Chen, X. Shi, L.D. Chen, and C. Uher, Intermetallics 19, 1747 (2011).
H.Y. Zhou, W.Y. Zhao, G. Liu, H. Cheng, and Q.J. Zhang, J. Electron. Mater. 42, 1436 (2013).
J. Yu, W.Y. Zhao, P. Wei, D.G. Tang, and Q.J. Zhang, J. Electron. Mater. 41, 1414 (2012).
L. Zhou, P. Qiu, C. Uher, X. Shi, and L. Chen, Intermetallics 32, 209 (2013).
J. Peng, X. Liu, L. Fu, W. Xu, Q. Lui, and J. Yang, J. Alloys Compd. 521, 141 (2012).
Z. Chen, J. Yang, R. Liu, L. Xi, W. Zhang, and J. Yang, J. Electron. Mater. 42, 2492 (2013).
J.R. Salvador, R.A. Waldo, C.A. Wong, M. Tessema, D.N. Brown, D.J. Miller, H. Wang, A.A. Wereszczak, and W. Cai, Mater. Sci. Eng. 178, 1087 (2013).
S. Ballikaya, N. Uzar, S. Yildirim, J.R. Salbador, and C. Uher, J. Sol. Stat. Chem. 193, 31 (2012).
J. Yu, W.Y. Zhao, X. Yang, P. Wei, D.G. Tang, and Q.J. Zhang, J. Electron. Mater. 41, 1395 (2012).
X. Shi, J.R. Salvador, J. Yang, and H. Wang, J. Electron. Mater. 38, 930 (2009).
S. Ballikaya, N. Uzar, S. Yildirim, H. Chi, X. Su, G. Tan, X. Tang, and C. Uher, J. Electron. Mater. 42, 1622 (2013).
K.H. Park, I.H. Kim, S.M. Choi, W.S. Seo, D.I. Cheong, and H. Kang, J. Electron. Mater. 42, 1377 (2013).
R.D. Shammon, Acta Cryst. A32, 751 (1976).
Y.C. Lan, A.J. Minnich, G. Chen, and Z.F. Ren, Adv. Funct. Mater. 20, 357 (2010).
K. Yang, H. Cheng, H.H. Hng, J. Ma, J.L. Mi, X.B. Zhao, T.J. Zhu, and Y.B. Zhang, J. Alloys Compd. 467, 528 (2009).
K.H. Park, I.H. Kim, S.M. Choi, Y.S. Lim, W.S. Seo, and K.H. Kim, Jpn. J. Appl. Phys. 52, 10MB18 (2013).
C. Kittel, Introduction to Solid State Physics (New York: Wiley, 1986), p. 152.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Joo, GS., Shin, DK. & Kim, IH. Thermoelectric Properties of Double-Filled p-Type La1−z Yb z Fe4−x Co x Sb12 Skutterudites. J. Electron. Mater. 44, 1383–1387 (2015). https://doi.org/10.1007/s11664-014-3362-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11664-014-3362-4