Thermal Conductivity of BAs under Pressure
Abstract
The thermal conductivity of boron arsenide (BAs) is believed to be influenced by phonon scattering selection rules due to its special phonon dispersion. Compression of BAs leads to significant changes in phonon dispersion, which allows for a test of first principles theories for how phonon dispersion affects three‐ and four‐phonon scattering rates. This study reports the thermal conductivity of BAs from 0 to 30 GPa. Thermal conductivity vs. pressure of BAs is measured by time‐domain thermoreflectance with a diamond anvil cell. In stark contrast to what is typical for nonmetallic crystals, BAs is observed to have a pressure independent thermal conductivity below 30 GPa. The thermal conductivity of nonmetallic crystals typically increases upon compression. The unusual pressure independence of BAs's thermal conductivity shows the important relationship between phonon dispersion properties and three‐ and four‐phonon scattering rates.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 22, 2022
- Source ID
- 10.1002/aelm.202200017
Entities
People
- Bo Sun
- Chen Li
- Fei Tian
- Qingan Cai
- Richard B Wilson
- Shanmin Wang
- Songrui Hou
- Xi Chen
- Youming Xu
- Zhifeng Ren
Organizations
- National Science Foundation
- Office of Basic Energy Sciences
- Office of Naval Research
- Office of Science
- Southern University of Science and Technology
- Sun Yat-sen University
- Tsinghua University
- United States Department of Energy
- University of California
- University of Houston