Overview of the recent studies on high‐pressure impurity ices

Abstract

In the present short review, we briefly overview the history of ice polymorphism under high-pressure and the recent progress on impurity ices (clathrate ice, salty ice, doped ice, empty ice, etc.), including our contributions due form high-pressure Raman investigations to these research fields. In particular, the unique roles of impurities in ice, which are (1) acceleration of proton ordering at lower temperatures, (2) offering a clue to form new ice phases, and (3) phase transitions other than the original equilibrium stability region of pure H 2 O, ice are introduced. Then, as prospects, we address promising impacts on a new area of ice physics with the active use of impurities.

Editorial on the special issue of JRS on vibrational spectroscopy of water

“…In water solids, there are 19 crystalline phases discovered to date and at least two amorphous states, which is another unique property of water. In this special issue, Yoshimura [11] reviewed recent Raman spectroscopic studies on high pressure phases of water with emphasis on impurities. Nagasawa et al [12] made a thorough review on state-of-the-art IR spectroscopy of vapor-deposited films of amorphous water that is of interstellar chemical relevance.…”