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Science. 2018 Aug 10;361(6402):582-585. doi: 10.1126/science.aat7932. Epub 2018 Jul 5.

Unusual high thermal conductivity in boron arsenide bulk crystals.

Author information

1
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA.
2
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3
Materials Science and Engineering Program, Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA.
4
Department of Physics, Boston College, Chestnut Hill, MA 02467, USA.
5
Department of Physics, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA.
6
Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
7
Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA.
8
Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.
9
Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
10
Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA.
11
Department of Physics, Boston College, Chestnut Hill, MA 02467, USA. david.broido@bc.edu lishi@mail.utexas.edu gchen2@mit.edu zren@uh.edu.
12
Materials Science and Engineering Program, Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA. david.broido@bc.edu lishi@mail.utexas.edu gchen2@mit.edu zren@uh.edu.
13
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. david.broido@bc.edu lishi@mail.utexas.edu gchen2@mit.edu zren@uh.edu.
14
Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA. david.broido@bc.edu lishi@mail.utexas.edu gchen2@mit.edu zren@uh.edu.

Abstract

Conventional theory predicts that ultrahigh lattice thermal conductivity can only occur in crystals composed of strongly bonded light elements, and that it is limited by anharmonic three-phonon processes. We report experimental evidence that departs from these long-held criteria. We measured a local room-temperature thermal conductivity exceeding 1000 watts per meter-kelvin and an average bulk value reaching 900 watts per meter-kelvin in bulk boron arsenide (BAs) crystals, where boron and arsenic are light and heavy elements, respectively. The high values are consistent with a proposal for phonon-band engineering and can only be explained by higher-order phonon processes. These findings yield insight into the physics of heat conduction in solids and show BAs to be the only known semiconductor with ultrahigh thermal conductivity.

PMID:
29976797
DOI:
10.1126/science.aat7932

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