A new form of ice has been discovered by scientists, expanding the known world of water. When a drop of water was squeezed between two diamonds at extremely high pressures, it solidified into a new crystalline phase at room temperature.
This new structure, called ice XXI, was discovered by researchers led by Geun Woo Lee at the Korea Research Institute of Standards and Science (KRISS) in collaboration with scientists at the European XFEL and DESY in Germany.
Ice XXI is the twenty-first form of ice ever identified, joining a range of previously known structures, including hexagonal, cubic, amorphous, and superionic forms, each emerging under unique combinations of temperature and pressure.
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Author's summary: Scientists discover new ice type.