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Thermal Conductivity Of Bi/Sb Superlattice

Published online by Cambridge University Press:  01 February 2011

D. W. Song ,
G. Chen ,
S. Cho ,
Y. Kim  and
J. B. Ketterson
D. W. Song
Affiliation:
Mechanical and Aerospace Engineering Department, University of California at Los Angeles, Los Angeles, CA 90025
G. Chen
Affiliation:
Mechanical and Aerospace Engineering Department, University of California at Los Angeles, Los Angeles, CA 90025
S. Cho
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
Y. Kim
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
J. B. Ketterson
Affiliation:
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208
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Abstract

The temperature-dependent cross-plane thermal conductivity of a 1-μm thick 50Å Bi / 50Å Sb superlattice on a (111) CdTe substrate was measured, using a differential 3-ω method. This method uses the temperature difference between the superlattice sample and a reference sample to calculate its cross-plane thermal conductivity. However, the substrate thermal conductivity is comparable to or smaller than the superlattice thermal conductivity near room temperature. This results in a very small or negative temperature difference, making the existing data reduction method inapplicable. Based on an improved model, the temperature-dependent thermal conductivity of the Bi/Sb superlattice is obtained and is about half of the literature value of Bi0.5Sb0.5 bulk alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z9.1
Copyright
Copyright © Materials Research Society 2000

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References

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