Novel H2-H2O clathrates at high pressures

Willem L. Vos*, Larry W. Finger, Russell J. Hemley, Ho Kwang Mao

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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High-pressure optical and x-ray studies of H2-H2O mixtures have revealed the formation of the first hydrogen clathrate hydrates. A rhombohedral hydrate with a H2O sublattice similar to ice II and a H2:H2O ratio of 1:6 is stable between 0.75 and 3.1 GPa (295 K). Above 2.3 GPa, a novel hydrate forms with the H2O molecules in a cubic diamond structure and with a very high H2:H2O stoichiometry of 1:1. The H2 molecules occupy voids in the H2O framework, thus improving the packing efficiency and stabilizing this hydrate to very high pressures of at least 30 GPa.

Original languageEnglish
Pages (from-to)3150-3153
Number of pages4
JournalPhysical review letters
Issue number19
Publication statusPublished - 8 Nov 1993
Externally publishedYes


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