期刊
RSC ADVANCES
卷 6, 期 107, 页码 105154-105160出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra24053d
关键词
-
资金
- Samsung Scholarship
- NSF CAREER Award [CBET 1254213]
- Boeing under Boeing-Caltech Strategic Research and Development Relationship Agreement
- National Science Foundation [ACI-1053575]
Pure amorphous solids are traditionally considered to set the lower bound of thermal conductivity due to their disordered atomic structure that impedes vibrational energy transport. However, the lower limits for thermal conductivity in heterogeneous amorphous solids and the physical mechanisms underlying these limits remain unclear. Here, we use equilibrium molecular dynamics to show that an amorphous SiGe nanocomposite can possess thermal conductivity substantially lower than those of the amorphous Si and Ge constituents. Normal mode analysis indicates that the presence of the Ge inclusion localizes vibrational modes with frequency above the Ge cutoff in the Si host, drastically reducing their ability to transport heat. This observation suggests a general route to achieve exceptionally low thermal conductivity in fully dense solids by restricting the vibrational density of states available for transport in heterogeneous amorphous nanocomposites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据