Equation of state of ordinary ice Ih at 145 K under true hydrostatic pressure up to 5 kbar

• Published in: Journal of physics. Condensed matter Vol. 17; no. 40; pp. S3029 - S3033
• Main Authors: Strässle, Th, Klotz, S, Loveday, J S, Braden, M
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Bristol IOP Publishing 12.10.2005; Institute of Physics; IOP Publishing [1989-....]
• Subjects: Condensed matter: structure, mechanical and thermal properties; Equations of state of specific substances; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Physics; Thermal expansion; Equations of state; Investigation method; Anisotropy; Neutron diffraction; Hydrostatic pressure; Ice; Lattice parameters; High pressure
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/17/40/006

Neutron diffraction in combination with a gas pressure cell device allowed us to measure the lattice parameters of ordinary ice (D20 ice Ih) up to 5 kbar at 145 K under true hydrostatic pressure conditions. The results are compared with earlier studies and may reveal a more precise equation of state of ice Ih at 145 K. The elastic anisotropy was found to be very small in accordance with the very small anisotropy of thermal expansion. Nitrogen was used as the pressure medium, for which it is shown here that under the above experimental conditions no clathrate hydrates are formed.