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Investigation of Thermoelectric Materials: Substitution effect of Bi on the Ag1-xPb18MTe20 (M = Sb, Bi) (x = 0, 0.14, 0.3)

Published online by Cambridge University Press:  01 February 2011

Mi-kyung Han ,
Huijun Kong ,
Ctirad Uher  and
Mercouri G Kanatzidis
Mi-kyung Han
Affiliation:
mi-han@northwestern.edu, Northwestern University, Department of Chemistry, 2145 Sheridan Rd., Evanston, IL, 60208, United States, 847-467-6135
Huijun Kong
Affiliation:
huijunk@umich.edu, University of Michigan, Department of Physics, Ann Arbor, MI, 48109, United States
Ctirad Uher
Affiliation:
cuher@umich.edu, University of Michigan, Department of Physics, Ann Arbor, MI, 48109, United States
Mercouri G Kanatzidis
Affiliation:
m-kanatzidis@northwestern.edu, Northwestern University, Department of Chemistry, Evanston, IL, 60208, United States
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Abstract

We performed comparative investigations of the Ag1-xPb18MTe20 (M = Bi, Sb) (x = 0, 0.14, 0.3) system to better understand the roles of Sb and Bi on the thermoelectric properties. In both systems, the electrical conductivity nearly keeps the same values, while the Seebeck coefficient decreases dramatically in going from Sb to Bi. Compared to the lattice thermal conductivity of PbTe, that of AgPb18BiTe20 is substantially reduced. The lattice thermal conductivity of the Bi analog, however, is higher than that of AgPb18SbTe20 and this is attributed largely to the decrease in the degree of mass fluctuation between the nanostructures and the matrix (for the Bi analog). As a result the dimensionless figure of merit ZT of Ag1-xPb18MTe20 (M = Bi) is found to be smaller than that of Ag1-xPb18MTe20 (M = Sb).

Keywords

thermoelectricityTePd
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U03-14
Copyright
Copyright © Materials Research Society 2008

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