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Superionic water
Superionic water is a theoretical phase of water under extreme heat and pressure which has properties of both a solid and a liquid.〔(Giant planets may host superionic water ), Nature, 22 March 2005.〕
At high temperatures and pressures, such as in the interior of giant planets, it is argued that water exists as ionic water in which the molecules break down into a soup of hydrogen and oxygen ions. At even higher pressures, ionic water will further condense into superionic water, where the oxygen crystallises and the hydrogen ions float around freely within the oxygen lattice.〔(Weird water lurking inside giant planets ), New Scientist,01 September 2010, Magazine issue 2776.〕
== Properties ==
Superionic water is thus far theoretical, but predictions have been made about its properties. If it were present on Earth, it would rapidly decompress and explode. Under the conditions theorized to cause water to enter the phase, it is believed that superionic water would be as hard as iron and would glow yellow.〔
it is theorized that superionic ice can possess two crystaline structures. At pressures in excess of 0.5 Mbar it is predicted that superionic ice would take on a body-centered cubic structure. However, at pressures in excess of 1 Mbar it is predicted that the structure would shift to a more stable face-centered cubic lattice.〔Phys.org, ("New phase of water could dominate the interiors of Uranus and Neptune" ), Lisa Zyga, 25 April 2013〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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