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Investigation of the thermoelectric properties of the PbTe-SrTe system

Published online by Cambridge University Press:  01 February 2011

Kanishka Biswas
Affiliation:
[email protected], Northwestern University, Department of Chemistry, Evanston, Illinois, United States
Jiaqing He
Affiliation:
[email protected], Northwestern University, Department of Chemistry, Evanston, Illinois, United States
Qichun Zhang
Affiliation:
[email protected], Northwestern University, Department of Chemistry, Evanston, Illinois, United States
Guoyu Wang
Affiliation:
[email protected], University of Michigan, Department of Physics, Ann Arbor, Michigan, United States
Ctirad Uher
Affiliation:
[email protected], University of Michigan, Department of Physics, Ann Arbor, Michigan, United States
Vinayak P Dravid
Affiliation:
[email protected], Northwestern University, Materials Science and Engineering, Evanston, Illinois, United States
Mercouri Kanatzidis
Affiliation:
[email protected], Northwestern University, Department of Chemistry, Evanston, Illinois, United States
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Abstract

PbTe-based materials are promising for efficient heat energy to electricity conversion. We present studies of the thermoelectric properties of the PbTe-SrTe system. X-ray diffraction patterns reveal that all the samples crystallize in the rock salt structure without noticeable secondary phase. Na2Te doping of the PbTe-SrTe materials resulting in a positive sign Hall coefficient indicating p-type conduction. Lattice thermal conductivity is significantly decreased with the insertion of SrTe in PbTe lattice. The ZT ∼ 1.3 of these materials is derived from their very low thermal conductivities and reasonably high power factor at 800 K.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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