Study on Mechanisms of Rare Earth Elements on Improving Thermoelectric Properties of RE_xCo₄Sb₁₂

Abstract:

It is the important way to improve thermoelectric properties of skutterudite materials by doping with rare earth elements. The mechanisms of improving properties of bulk RE_xCo₄Sb₁₂ materials prepared by mechanical alloy and spark plasma sintering (MA-SPS) at 650°C were investigated by analyzing the composition, microstructure and atomic occupying locations. According the results it can be considered that the mechanism to improve the thermoelectric properties of rare earth elements is that rare earth element Ce in the samples mainly plays the doping role in reducing the resistivity of the sample and improving the conductivity, so that it makes the figure of merit ZT of samples increase significantly.

• Periodical: Applied Mechanics and Materials (Volumes 71-78)
• Pages: 3737-3740
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.71-78.3737
• Online since: July 2011
• Authors: Ke Gao Liu, Jing Li
• Keywords: Fitting Analysis, Rare Earth Element (REE), Skutterudite, Thermoelectric Properties

References

[1] T.X. Liu, X. f. Tang, W.J. Xie: Journal of Rare Earths, Vol. 25, Iss. 6, Dec. 2007, pp.739-743.

[2] X. Zhen, X.Y. Huang, X.H. Chen: Scripta Materialia, Vol. 62, Iss. 2, Jan. 2010, pp.93-96.

[3] Liu K.G., Zhang J.X., Lu,Q.M.: Journal of Rare Earths, 2004(3), pp.390-394.

[4] Z.D. Guan, Z.T. Zhang: Physical properties of inorganic materials. (Tsinghua University Press, Beijing. 2004).

[5] T.J. Zhu, X.B. Zhao: Materials Science and Engineering in China, Vol. 17, No. 4, 1999(12), pp.55-59.

[6] H. Takizawa, K. Miura, M. Ito: Journal of Alloys and Compounds, 282 (1999), pp.79-83.

[7] X.F. Tang, L.D. Chen, H.T. Xiao: Physics in China, 2000, Vol. 49 (11), pp.2196-2200.