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Science 5 July 1996:
Vol. 273. no. 5271, pp. 9 - 0
DOI:

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Water can form different amorphous solids--for example, condensing water vapor at 100 kelvin (K) produces amorphous solid water (ASW), which if cooled and compressed can form a different phase, a high-density amorphous (HDA) solid. Johari et al. (p. 90) show that both ASW and hyperquenched glassy water (formed by rapidly cooling water droplets) form viscous water (water A) at 136 K. Heating HDA water forms a low-density amorphous phase that at 129 K forms another viscous water phase, water B. These two viscous water forms do not thermally interconvert even when they are heated to 148 K. The existence of this barrier between liquids can provide insight into the configuration relaxations that occur in liquid water.




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