Enhanced thermoelectric properties in CoSb3-x Tex alloys prepared by mechanical alloying and spark plasma sintering

被引：0
|
作者：
Liu, Wei-Shu [1 ]
Zhang, Bo-Ping [1 ]
Li, Jing-Feng [2 ]
Zhang, Hai-Long [1 ]
Zhao, Li-Dong [1 ]
机构：
[1] School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
[2] State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
来源：
Journal of Applied Physics | 2007年 / 102卷 / 10期
关键词：
CoSb3-x Tex (x=0.05-0.3) skutterudite polycrystals with an average grain size of 160 nm were fabricated by mechanical alloying combined with spark plasma sintering. The variation of lattice parameter with Te content indicates that the solution limit of Te was x=0.15; above which the impurity phases of Te; CoTe2; and CoSb2 appeared; and the matrix cracked above 500 °C. All samples behaved as degenerate semiconductors. The forbidden energy gap was estimated to be 0.047 eV from the temperature corresponding to the occurrence of intrinsic excitation; which is in good agreement with Singh's theoretical calculation (0.05 eV) [D. J. Singh and W. E. Pickett; Phys; Rev; B; 50; 11235 (1994)]. The CoSb2.85 Te0.15 sample had the highest power factor and the lowest thermal conductivity; resulting in the highest thermoelectric figure of merit; ZT=0.93 at 547 °C. The role of Te substitution in enhancing thermoelectric properties is discussed in relation to the bipolar diffusion mechanism. © 2007 American Institute of Physics;
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