Bizarre ice XVIII is an oxygen ion crystal swimming in a sea of protons

An image showing ice cubes

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High pressure superionic form of water may hold clues to behaviour of giant icy planets in our solar system

Shock compression has been used by US researchers to infer the structure of a novel superionic phase of water ice that forms at extreme pressures and temperatures.1 The results could potentially have important implications for scientists’ understanding of the properties of numerous icy planets in the solar system and beyond.