Thermal Conductivity of BAs under Pressure
Thermal Conductivity of BAs under Pressure
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DOI：
10.1002/aelm.202200017
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Songrui Hou;Bo Sun;F. Tian;Q. Cai;Y. Xu;Shanmin Wang;Wanyue Peng;Xi Chen;Z. Ren;
中科院分区：
文献类型：
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作者：
Songrui Hou;Bo Sun;F. Tian;Q. Cai;Y. Xu;Shanmin Wang;Wanyue Peng;Xi Chen;Z. Ren;
由于其特殊的声子色散，砷化硼（BAs）的热导率被认为受到声子散射选择规则的影响。 BA 的压缩会导致声子色散的显着变化，从而可以测试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。这项研究报告了 BA 的导热系数为 0 至 30 GPa。 BA 的热导率与压力的关系是通过金刚石砧池的时域热反射来测量的。与非金属晶体的典型情况形成鲜明对比的是，BA 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 热导率与压力的不寻常关系表明声子色散特性与三声子和四声子散射率之间的重要关系。
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.