Title :
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
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; SryCo4Sb12; X-ray diffraction pattern; YbyCo4Sb12; 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;
Conference_Titel :
Thermoelectrics, 2006. ICT '06. 25th International Conference on
Conference_Location :
Vienna
Print_ISBN :
1-4244-0811-3
Electronic_ISBN :
1094-2734
DOI :
10.1109/ICT.2006.331301
