Thermoelectric Transport Properties of RyFe3NiSb12 (R = Ba,Nd and Yb)

doi:10.1016/j.jmst.2014.05.007

J. Mater. Sci. Technol. ›› 2014, Vol. 30 ›› Issue (11): 1134-1140.DOI: 10.1016/j.jmst.2014.05.007

收稿日期:2013-08-02 出版日期:2014-11-20 发布日期:2014-12-12

Thermoelectric Transport Properties of RyFe₃NiSb₁₂ (R = Ba,Nd and Yb)

Ruiheng Liu¹,Jung Young Cho²,Jiong Yang³,Wenqing Zhang¹,Lidong Chen^1,*

1 CAS Key Laboratory for Energy-conversion Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China; 2 Materials and Processes Laboratory,GM R&D Center,Warren,MI 48090,USA; 3 Department of Materials Science & Engineering,University of Washington,Seattle,WA 98195-2120,USA

Received:2013-08-02 Online:2014-11-20 Published:2014-12-12
Contact: * Corresponding author.Prof; E-mail address:cld@mail.sic.ac.cn (L.Chen).

摘要/Abstract

Abstract: To evaluate the influence of Ni substitution on electrical transport properties,the thermoelectric transport properties of the p-type skutterudites RyFe₃NiSb₁₂ (R = Ba,Nd and Yb) are systematically investigated from 2.5 K to 800 K.By carefully modifying the filling fractions of the three fillers,Ba,Nd and Yb,the carrier concentration is precisely adjusted,which changes proportionally to the nominal value calculated by valence counting rule.The carrier concentration dependences of mobility and Seebeck coefficient represent two band contribution in the valence band,and the optimized carrier concentration for thermoelectric performance is between (5-9) × 10²⁰ cm⁻³.The lattice thermal conductivity of samples filled with rare-earth elements (Nd and Yb) are significantly lower as compared to Ba-filled,due to the lower resonant frequency and partial filling.Compared with Co substitution,Ni substitution tends to close the band gap,which results in heavier bipolar diffusion at high temperature for RyFe₃NiSb₁₂.However,due to the enhancement of the density of state,when the carrier concentrations are similar,RyFe₃NiSb₁₂ possess higher thermal power and thus higher power factor than RyFe₂Co₂Sb₁₂ in the lower temperature range.A ZT value of 0.73 is obtained for Yb_0.77Fe₃NiSb₁₂ at 600 K.

. [J]. J. Mater. Sci. Technol., 2014, 30(11): 1134-1140.

Ruiheng Liu, Jung Young Cho, Jiong Yang, Wenqing Zhang, Lidong Chen. Thermoelectric Transport Properties of RyFe₃NiSb₁₂ (R = Ba,Nd and Yb)[J]. J. Mater. Sci. Technol., 2014, 30(11): 1134-1140.

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Thermoelectric Transport Properties of RyFe₃NiSb₁₂ (R = Ba,Nd and Yb)

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