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Issue 107, 2016
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Sub-amorphous thermal conductivity in amorphous heterogeneous nanocomposites

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Abstract

Pure amorphous solids are traditionally considered to set the lower bound of thermal conductivity due to their disordered atomic structure that impedes vibrational energy transport. However, the lower limits for thermal conductivity in heterogeneous amorphous solids and the physical mechanisms underlying these limits remain unclear. Here, we use equilibrium molecular dynamics to show that an amorphous SiGe nanocomposite can possess thermal conductivity substantially lower than those of the amorphous Si and Ge constituents. Normal mode analysis indicates that the presence of the Ge inclusion localizes vibrational modes with frequency above the Ge cutoff in the Si host, drastically reducing their ability to transport heat. This observation suggests a general route to achieve exceptionally low thermal conductivity in fully dense solids by restricting the vibrational density of states available for transport in heterogeneous amorphous nanocomposites.

Graphical abstract: Sub-amorphous thermal conductivity in amorphous heterogeneous nanocomposites

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Publication details

The article was received on 27 Sep 2016, accepted on 31 Oct 2016 and first published on 31 Oct 2016


Article type: Paper
DOI: 10.1039/C6RA24053D
Citation: RSC Adv., 2016,6, 105154-105160
  • Open access: Creative Commons BY-NC license
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    Sub-amorphous thermal conductivity in amorphous heterogeneous nanocomposites

    J. Moon and A. J. Minnich, RSC Adv., 2016, 6, 105154
    DOI: 10.1039/C6RA24053D

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