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Lattice thermal conductivity of bismuth-antimony alloy single crystals at low temperatures

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Abstract

Thermal conductivity measurements in a number of bismuth-antimony alloy single crystals, with antimony concentrations from 1.72 at.% to 20 at.% are reported. Analysis of the results shows that in this alloy system, below about 25 K, the heat carriers are predominantly phonons. Callaway's theoretical model for lattice thermal conductivity has been utilized for the analysis of the results, using various phonon-scattering processes, and this model has been found to give a good fit to the experimental data, particularly below 25 K, where lattice conduction predominates. The Casimir model for finding the characteristic length for boundary scattering fails to explain the experimental results. This indicates the existence of microscale fluctuations in the composition of the alloy.

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Authors and Affiliations

  1. Department of Physics and Astrophysics, University of Delhi, 110007, Delhi, India

    Tapas K. Dey & K. D. Chaudhuri

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  1. Tapas K. Dey
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  2. K. D. Chaudhuri
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Dey, T.K., Chaudhuri, K.D. Lattice thermal conductivity of bismuth-antimony alloy single crystals at low temperatures. J Low Temp Phys 23, 419–426 (1976). https://doi.org/10.1007/BF00116930

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  • DOI: https://doi.org/10.1007/BF00116930

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