Investigations of the hydrogen bonds and vibrational spectra of clathrate ice XVI

被引：0

作者：

Wang Z.-R. ^{[1
]}

Zhu X.-L. ^{[1
]}

Jiang L. ^{[1
]}

Zhang K. ^{[1
]}

Luo H.-W. ^{[1
]}

Gu Y. ^{[1
]}

Zhang P. ^{[1
]}

机构：

[1] School of Space Science and Physics, Shandong University, Weihai

来源：

Materials | 2019年 / 12卷 / 02期

关键词：

Hydrogen bond; Ice XVI; Inelastic neutron scattering; Vibration mode;

D O I：

10.3390/MA12020246

中图分类号：

学科分类号：

摘要：

Natural gas hydrates are ice-like crystalline materials formed from natural gas and clathrate ice under high pressure and low temperature. Ice XVI, the first S-II type clathrate ice produced in the lab, was simulated by first-principles density functional theory with the CASTEP code. A 34-molecule supercell was built to mimic the hydrogen-disordered structure. The vibrational spectra were calculated as a reference for inelastic neutron scattering (INS), infrared (IR) absorption, and Raman scattering experiments. Two kinds of H-bond vibration modes corresponding to two different bond strengths were found in our previous studies. In this paper, the statistics of distribution calculated by integrating these two kinds of modes was found to match the phonon density of states (PDOS) very well. We confirmed that the two basic types of H-bonds also appeared in clathrate ice XVI. The typical normal modes were analyzed to illustrate the dynamic process of lattice vibrations. © 2019 by the authors.

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