Synthesis and Thermoelectric Properties of (Sr,Yb)yCo4Sb12 Double Filled Skutterudites

Author

Bai, S.Q. ; Zhao, X.Y. ; Pei, Y.Z. ; Chen, L.D. ; Zhang, W.Q.

Author_Institution

Shanghai Inst. of Ceramics, Chinese Acad. of Sci., Shanghai

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

145

Lastpage

147

Abstract

(Sr,Yb)_yCo₄Sb₁₂ double filled skutterudites are synthesized by a melting method and sintered by Spark Plasma Sintering (SPS) technique. Small amount of Yb₂O₃ and YbSb₂ as impurity phases are found with high ytterbium content in the X-ray diffraction patterns of sintered materials. The thermal conductivity, electrical conductivity and Seebeck coefficient are measured from room temperature to 850 K. The influence of different filling fractions of ytterbium on the thermoelectric properties of (Sr,Yb)_yCo₄Sb₁₂ is studied. The lattice thermal conductivity of double filled skutterudites is reduced dramatically as compared to that of Sr single-filled skutterudites with similar filling fractions. An enhancement in power factor and dimensionless thermoelectric figure of merit (ZT) is observed in the double filled skutterudites

Keywords

Seebeck effect; X-ray diffraction; electrical conductivity; impurities; sintering; strontium compounds; thermal conductivity; ytterbium compounds; 300 to 850 K; Seebeck coefficient; Sr single-filled skutterudite; Sr_yCo₄Sb₁₂; X-ray diffraction pattern; Yb_yCo₄Sb₁₂; dimensionless thermoelectric figure of merit; double filled skutterudite synthesis; electrical conductivity; filling fraction; impurity phases; lattice thermal conductivity; melting method; power factor enhancement; spark plasma sintering; thermoelectric property; Filling; Impurities; Plasma materials processing; Plasma properties; Plasma x-ray sources; Sparks; Temperature measurement; Thermal conductivity; Thermoelectricity; Ytterbium;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0811-3

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331301

Filename

4133257