Ice VI

Ice VI is a tetragonal crystalline form of ice formed by cooling water to 270 K at 1.1 GPa. It exhibits Debye relaxation. A proton-ordered form of ice VI has been predicted but not proven, as ice XV near 108-80 K.

Ordinary water ice is known as ice Ih, (in the Bridgman nomenclature). Different types of ice, from ice II to ice XIV, have been created in the laboratory at different temperatures and pressures.