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Boron arsenide phonon dispersion from inelastic x-ray scattering: Potential for ultrahigh thermal conductivity

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [3];  [4];  [4];  [1]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.; Univ. of Tennessee, Knoxville, TN (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.
Cubic boron arsenide (BAs) was predicted to have an exceptionally high thermal conductivity (k) ~2000 Wm-1K-1 at room temperature, comparable to that of diamond, based on first-principles calculations. Subsequent experimental measurements, however, only obtained a k of ~200 Wm-1K-1. To gain insight into this discrepancy, we measured phonon dispersion of single crystal BAs along high symmetry directions using inelastic x-ray scattering (IXS) and compared these with first-principles calculations. Based on the measured phonon dispersion, we have validated the theoretical prediction of a large frequency gap between acoustic and optical modes and bunching of acoustic branches, which were considered the main reasons for the predicted ultrahigh k. This supports its potential to be a super thermal conductor if very high-quality single crystal samples can be synthesized.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1337029
Alternate ID(s):
OSTI ID: 1335724
OSTI ID: 1397255
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 94; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

High Thermal Conductivity in Boron Arsenide: From Prediction to Reality journal April 2019
High Thermal Conductivity in Boron Arsenide: From Prediction to Reality journal April 2019
Seeded growth of boron arsenide single crystals with high thermal conductivity journal January 2018
Impurity-derived p -type conductivity in cubic boron arsenide journal December 2018
Probing polaritons in the mid- to far-infrared journal May 2019
Perspective on ab initio phonon thermal transport journal August 2019
Four-phonon scattering significantly reduces intrinsic thermal conductivity of solids journal October 2017
Antisite Pairs Suppress the Thermal Conductivity of BAs journal September 2018

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