Boron arsenide phonon dispersion from inelastic x-ray scattering: Potential for ultrahigh thermal conductivity
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.; Univ. of Tennessee, Knoxville, TN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- 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) similar to 2000Wm(-1)K(-1) at room temperature, comparable to that of diamond, based on first-principles calculations. Subsequent experimental measurements, however, only obtained a k of similar to 200Wm(-1)K(-1). To gain insight into this discrepancy, we measured phonon dispersion of single-crystal BAs along high symmetry directions using inelastic x-ray scattering 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 Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; Virginia Polytechnic Institute and State University (Virginia Tech)
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357
- OSTI ID:
- 1337029
- Alternate ID(s):
- OSTI ID: 1335724; OSTI ID: 1397255
- Journal Information:
- Physical Review B, Vol. 94, Issue 22; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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High Thermal Conductivity in Boron Arsenide: From Prediction to Reality
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journal | April 2019 |
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