Lattice dynamics study of low energy guest-host coupling in clathrate hydrate

被引：0
|
作者：
Yang Yue-Hai [1 ]
Dong Shun-Le [1 ]
Wang Lin [1 ]
机构：
[1] Ocean Univ China, Dept Phys, Qingdao 266100, Peoples R China
来源：
CHINESE PHYSICS B | 2008年 / 17卷 / 01期
关键词：
lattice dynamics; clathrate hydrate; guest-host coupling; anticrossing;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Our lattice dynamics simulation of Xe-hydrate with four-site TIP4P oxygen-shell model can accurately reproduce each peak position in the inelastic incoherent neutron scattering spectrum at the acoustic band (below 15 meV) and yield correct relative intensity. Based on the results, the uncertain profile at similar to 6 meV is assigned to anharmonic guest modes coupled strongly to small cages. Blue shift is proposed in phonon dispersion sheet in the case of anticrossing and found to be an evident signal for guest-host coupling that explains the anomalous thermal conductivity of clathrate hydrate.
引用
收藏
页码：270 / 273
页数：4
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