Journal Article

PUBDB-2021-01434

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Novel Hydrogen Clathrate Hydrate

Wang, Y. ; Glazyrin, K.DESY* ; Roizen, V. ; Oganov, A. R. ; Chernyshov, I. ; Zhang, X. ; Greenberg, E. (Corresponding author)Extern* ; Prakapenka, V. B. ; Yang, X. ; Jiang, S.-q. ; Goncharov, A. F.

2020
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.125.255702  doi:10.3204/PUBDB-2021-01434

Abstract: We report a new hydrogen clathrate hydrate synthesized at 1.2 GPa and 298 K documented by single-crystal x-ray diffraction, Raman spectroscopy, and first-principles calculations. The oxygen sublattice ofthe new clathrate hydrate matches that of ice II, while hydrogen molecules are in the ring cavities, whichresults in the trigonal $R3c$ or $R \bar{3}c$ space group (proton ordered or disordered, respectively) and thecomposition of $ðH_2 OÞ_6 H_2$. Raman spectroscopy and theoretical calculations reveal a hydrogen disorderednature of the new phase C0$_1$, distinct from the well-known orderedC1clathrate, to which this new structuretransforms upon compression and/or cooling. This new clathrate phase can be viewed as a realization of adisordered ice II, unobserved before, in contrast to all other ordered ice structures.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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