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Thermoelectric properties of nanostructured (Pb1-mSnmTe)1-x(PbS)x with Pb and Sb precipitates

Published online by Cambridge University Press:  01 February 2011

Steven N Girard ,
Joseph R. Sootsman ,
Chia-Her Lin ,
John Androulakis  and
Mercouri G. Kanatzidis
Steven N Girard
Affiliation:
s-girard@northwestern.edu, Northwestern University, Chemistry, 2145 Sheridan Rd., Evanston, IL, 60208-3113, United States
Joseph R. Sootsman
Affiliation:
j-sootsman@northwestern.edu, Northwestern University, Chemistry, Evanston, IL, 60208-3113, United States
Chia-Her Lin
Affiliation:
chlin@chemistry.msu.edu, Michigan State University, Chemistry, East Lansing, MI, 48824, United States
John Androulakis
Affiliation:
androula@chemistry.msu.edu, Michigan State University, Chemistry, East Lansing, MI, 48824, United States
Mercouri G. Kanatzidis
Affiliation:
m-kanatzidis@northwestern.edu, Northwestern University, Chemistry, Evanston, IL, 60208-3113, United States
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Abstract

We report the physical characterization and thermoelectric properties of (Pb0.95Sn0.05Te)0.92(PbS)0.08 containing excess Pb and Sb prepared using the matrix encapsulation technique. Samples of (Pb0.95Sn0.05Te)0.92(PbS)0.08 : Pb 0.5 - 4 at. % rapidly quenched from the melt show microscale Pb inclusions that increase the thermal conductivity while slightly increasing the power factor, compared to (Pb0.95Sn0.05Te)0.92(PbS)0.08. Samples of (Pb0.95Sn0.05Te)0.92(PbS)0.08 : Pb 0.5%, Sb 2% prepared using the same technique show microscale Sb and Pb inclusions that upon heating cause rapid PbS and Sb segregation from the PbTe matrix. This behavior significantly alters the microstructure and degrades the transport properties of the material.

Keywords

thermoelectricitynanostructurephase equilibria
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U03-15
Copyright
Copyright © Materials Research Society 2008

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