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The phase diagram of the water-hydrogen system in the crystallization field of solid solutions based on ices Ih and II at high pressures

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Abstract

The decomposition curves of the solid solutions based on ices Ih (α-solutions) and II (β-solutions) in the water-hydrogen system were studied by the DTA technique at pressures up to 7 kbar. The α-solution is destabilized by pressure but to a lesser degree than ice Ih and is stable up to 2.3 kbar. Theβ-solution is stabilized by pressure and at 7 kbar decomposes at about 20°C. TheP, T-phase diagram of the water-hydrogen system in the crystallization range is constructed on the basis of reference [1] and our data. All possible types of stoichiometric interrelationships in the guest —host system are demonstrated by the example of the water-hydrogen system.

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Dyadin, Y.A., Aladko, E.Y. The phase diagram of the water-hydrogen system in the crystallization field of solid solutions based on ices Ih and II at high pressures. J Incl Phenom Macrocycl Chem 20, 115–121 (1994). https://doi.org/10.1007/BF00709335

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Key words

  • Hydrogen-water solid solutions
  • phase diagram
  • stoichiometry of clathrates
  • high pressure