Volume 33 Issue 2
Apr 2019
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Article Contents
JIANG Shuqing, YANG Xue, WANG Yu, ZHANG Xiao, CHENG Peng. Symmetrization and Chemical Precompression Effect of Hydrogen-Bonds in H2-H2O System[J]. Chinese Journal of High Pressure Physics, 2019, 33(2): 020102. doi: 10.11858/gywlxb.20190730
Citation: JIANG Shuqing, YANG Xue, WANG Yu, ZHANG Xiao, CHENG Peng. Symmetrization and Chemical Precompression Effect of Hydrogen-Bonds in H2-H2O System[J]. Chinese Journal of High Pressure Physics, 2019, 33(2): 020102. doi: 10.11858/gywlxb.20190730

Symmetrization and Chemical Precompression Effect of Hydrogen-Bonds in H2-H2O System

doi: 10.11858/gywlxb.20190730
Funds:  National Natural Science Foundation of China (21473211, 11674330, 11604342, 11504382, 51727806); Science Challenge Project (TZ2016001)
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  • Author Bio:

    JIANG Shuqing (1987-), Ph.D, major in high-energy material synthesis under extreme high-temperature and high-pressure conditions. E-mail: jiangshuqing@issp.ac.cn

  • Received Date: 26 Feb 2019
  • Rev Recd Date: 21 Mar 2019
  • Issue Publish Date: 25 Mar 2019
  • Hydrogen hydrate (H2-H2O) excited significant interest as an environmentally clean and efficient hydrogen storage material. Here we conducted a high-pressure experimental research on hydrogen hydrate combined with in-situ Raman spectroscopy and synchrotron X-ray diffraction measurements. Our results indicated that the cubic C2 phase with stoichiometry 1∶1 of H2 and H2O transformed to a new tetragonal phase C3 after packing more hydrogen molecules above 24.5 GPa. The structure of C3 was determined to be P41 with a 1∶2 ratio of H2O to H2, and could survive down to 8.6 GPa upon decompression. Two districted behaviors of guest hydrogen clusters were observed with increasing pressure. One showed blue-red frequency shift transition similarly as pure hydrogen, the other continuously blue-shifted to higher frequencies in the whole pressure range. Fermi resonance between the deformational mode and softened stretching mode was firstly detected, indicating that the hydrogen-bond was symmetrized at around 55 GPa. The complicated behaviors of hydrogen molecules and interactions with water molecules in hydrogen hydrate provided a different insight into the guest-host system under pressure.

     

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