Phase diagram and composition of water based crystalline phases in hydrogen - Water binary system

In this work the original approach developed in our group is applied to describe the phase diagram on p-T plane and phases composition for hydrogen - water system in a wide pressure and temperature range and for prediction of composition and thermodynamic properties of hydrogen hydrates. The p-T phase diagram was calculated for pressure up to 2.5 GPa and temperature from 200 to 330 K, and the following phases have been found to be stable within this region: H-2 clathrate hydrate of cubic structure II, H-2 filled ices I-h, I-c, II. The obtained monovariant equilibrium lines are found to be in a good agreement with known experimental and theoretical data. Calculated solid phase compositions are also in a good agreement with previous results.