Two triple points in the H₂O–H₂ system

Abstract

Using a volumetric technique, phase transitions in the H₂O–H₂ system were investigated in the vicinity of two points of an invariant equilibrium, L+I _h+sII and L+sII+C ₁, located at 1.07 kbar and−10 °C and at 3.6 kbar and 1 °C, respectively. Liquid water (L), low-pressure hexagonal ice (I _h) and high-pressure cubic (sII) and rhombohedral (C ₁) clathrate hydrates were in equilibrium with gaseous hydrogen taken in excess.

^†This paper was presented at the XLVI^th European High Pressure Research Group (EHPRG 46) Meeting, Valencia (Spain), 7–12 September, 2008.

Keywords:

• hydrogen hydrates
• high pressures
• phase equilibria

Acknowledgements

This work was supported by the Russian Academy of Sciences (the program “Physics and Mechanics of Strongly Compressed Matter”), the Russian Foundation for Basic Research (project no. 08-02-00846) and the Foundation for Support of Russian Science. One of the authors (V.S.E.) thanks the Organising Committee of the 46th EHPRG Conference and the Spanish High Pressure Research Network MALTA-Consolider (Ingenio 2010) for their financial support to attend the Conference.

Notes

^†This paper was presented at the XLVI^th European High Pressure Research Group (EHPRG 46) Meeting, Valencia (Spain), 7–12 September, 2008.