Nature of low-temperature dense ice up to 80 GPa observed by x-ray diffraction

2021/04/22 by Fukui, Hiroshi, Kadobayashi, Hirokazu, Abe, Hirotaka +3
#Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2104.11107

Abstract

We have measured the lattice volume of ice VIII in different pressure-temperature pathways and found isothermal compression at low-temperature conditions makes the volume larger. Ice VIII has become its high-pressure phase with the molar volume of 6.45 cm³ at 10 K where the pressure can be estimated as 60.4 GPa based on the third-order Birch-Murnaghan equation with parameters determined in this study (K₀= 32.4 GPa, K'₀= 3.7, and V₀= 11.9 cm³). The present results indicate that this high-pressure state is paraelectric with tetragonal symmetry.

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