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Mechanical Characterization of PbTe-based Thermoelectric Materials

Published online by Cambridge University Press:  01 February 2011

Fei Ren
Affiliation:
renfei79@gmail.com, Michigan State University, Chemical Engineering and Materials Science, 2527 Engineering Building, Michigan State University, East Lansing, MI, 48824, United States, 5179445225, 5174321003
Bradley D Hall
Affiliation:
hallbra6@msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, MI, 48824, United States
Jennifer E Ni
Affiliation:
nijennif@msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, MI, 48824, United States
Eldon D Case
Affiliation:
casee@egr.msu.edu, Michigan State University, Chemical Engineering and Materials Science, East Lansing, MI, 48824, United States
Joe Sootsman
Affiliation:
j-sootsman@northwestern.edu, Northwestern University, Department of Chemistry, Evanston, IL, 60208, United States
Mercouri G Kanatzidis
Affiliation:
m-kanatzidis@northwestern.edu, Northwestern University, Department of Chemistry, Evanston, IL, 60208, United States
Edgar Lara-Curzio
Affiliation:
laracurzioe@ornl.gov, Oak Ridge National Laboratory, High temperature materials laboratory, Oak Ridge, TN, 37831, United States
Rosa M Trejo
Affiliation:
trejorm1@ornl.gov, Oak Ridge National Laboratory, High temperature materials laboratory, Oak Ridge, TN, 37831, United States
Edward J Timm
Affiliation:
timm@egr.msu.edu, Michigan State University, Department of Mechanical Engineering, East Lansing, MI, 48824, United States
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Abstract

PbTe-based thermoelectric (TE) materials exhibit promising thermoelectric properties and have potential applications in waste heat recovery from sources such as truck engines and shipboard engines. TE components designed for these applications will be subject to mechanical/thermal loading and vibration as a result from in-service conditions, including mechanical vibration, mechanical and/or thermal cycling, and thermal shock.

In the current study, we present and discuss the mechanical properties of several PbTe-based compositions with different dopants and processing methods, including n-type and p-type specimens fabricated both by casting and by powder processing. Room temperature hardness and Young's modulus are studied by Vickers indentation and nanoindentation while fracture strength is obtained by biaxial flexure testing. Temperature dependent Young's modulus, shear modulus, and Poisson's ratio are studied via resonant ultrasound spectroscopy (RUS).

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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