Thermal Conductivity of BAs under Pressure,Advanced Electronic Materials

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Thermal Conductivity of BAs under Pressure
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-07-22 , DOI: 10.1002/aelm.202200017
Songrui Hou ₁ , Bo Sun ₂ , Fei Tian _{3,

4} , Qingan Cai ₅ , Youming Xu ₆ , Shanmin Wang ₇ , Xi Chen ₆ , Zhifeng Ren ₄ , Chen Li _{1,

5} , Richard B. Wilson _{1,

5}

Affiliation

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.

中文翻译：

BAs在压力下的热导率

由于其特殊的声子色散，砷化硼（BAs）的热导率被认为受声子散射选择规则的影响。BA 的压缩导致声子色散的显着变化，这允许测试关于声子色散如何影响三声子和四声子散射率的第一原理理论。本研究报告了 0 到 30 GPa 的 BA 的热导率。BAs 的热导率与压力的关系是使用金刚石砧座通过时域热反射率测量的。与非金属晶体的典型情况形成鲜明对比的是，BAs 的热导率与压力无关，低于 30 GPa。非金属晶体的热导率通常在压缩时增加。BA的不同寻常的压力独立性

更新日期：2022-07-22

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