Speaker
Dr
Fei Yen
(Southern University of Science and Technology)
Description
Many regions of the phase diagram of ice remain unclear. Through measurements of the near static dielectric constant a) the ice Ih/XI phase boundary line is confirmed to occur at 73 K along with the existence of the ice Ih/II/XI triple point residing at 0.07 GPa and 73 K [Phys. Chem. Chem. Phys. 2015, 17, 12458]; b) a critical point is identified to reside near 33-50 MPa and below 210 K believed to be the first direct measurement of the 2nd critical point of water [J. Phys. Chem. C 2015, 119, 20168]; c) the ice II/V/VI triple point is verified to occur at 0.62 GPa and 208 K; d) the ice IV/VI boundary line is extended to 1.2 GPa; and e) macroscopic quantum phenomenon in the form of correlated proton tunneling is identified to occur below 20 K [J. Phys. Chem. Lett. 6, 2822].
Significance statement
A resolved phase diagram of H2O will help better understand a) the molecular dynamics of protons in ice; b) ice nucleation processes in outer space conditions, and; c) the interior composition of many icy planets.
Primary author
Dr
Fei Yen
(Southern University of Science and Technology)
Co-authors
Dr
Adam Berlie
(ISIS Pulsed Neutron and Muon Source)
Dr
Lang Chen
(Southern University of Science and Technology)
