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Thermoelectric Properties of the Cubic Family of Compounds AgPbBiQ3 (Q = S, Se, Te). Very Low Thermal Conductivity Materials

Published online by Cambridge University Press:  10 February 2011

S. Sportouch ,
M. Basteat ,
P. Brazis ,
J. Ireland ,
C. R. Kannewurf ,
C. Uher  and
M. G. Kanatzidis
S. Sportouch
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824
M. Basteat
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48190-1120
P. Brazis
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208
J. Ireland
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208
C. R. Kannewurf
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208
C. Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48190-1120
M. G. Kanatzidis
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824
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Abstract

The AgPbBiQ3 class of compounds and their solid solution members are related to the NaCl structure type, where Ag, Pb and Bi atoms are statistically disordered on the Na site and Q atoms occupy the Cl site. These compounds were synthesized by combining the elements in the appropriate ratio and heating under static vacuum at 900° C for 3 days. They are narrow gap semiconductors with band gaps in the range of 0.6 to 0.28 eV. The charge-transport properties were measured on ingots as a function of temperature. The compounds AgPbBiTe3, AgPbBiSe3, AgPbBiTe2.75Se0.25and AgPbBiTe2Se, undoped, possess an electrical conductivity in the range of 70 S/cm to 400 S/cm. These materials exhibit negative thermopower ranging from -40 μV/K to -160 μV/K at room temperature and thermal conductivity less than 1.30 W/mK.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 545: Symposium Z – Thermoelectric Materials 1998 - The Next Generation… , 1998 , 123
Copyright
Copyright © Materials Research Society 1999

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