Boron arsenide phonon dispersion from inelastic x-ray scattering - Potential for ultrahigh thermal conductivity
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2016-12-14 |
| Journal | Physical review. B./Physical review. B |
| Authors | Hao Ma, Chen Li, Shixiong Tang, Jiaqiang Yan, Ahmet Alatas |
| Institutions | University of Tennessee at Knoxville, Argonne National Laboratory |
| Citations | 38 |
Abstract
Section titled âAbstractâCubic boron arsenide (BAs) was predicted to have an exceptionally high thermal conductivity (k) ~2000 Wm<sup>-1</sup>K<sup>-1</sup> 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.
Tech Support
Section titled âTech SupportâOriginal Source
Section titled âOriginal SourceâReferences
Section titled âReferencesâ- 2007 - Light Scattering in Solids IX