Visual Observations of the Amorphous-Amorphous Transition in H2O Under Pressure

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Science  18 Oct 1991:
Vol. 254, Issue 5030, pp. 406-408
DOI: 10.1126/science.254.5030.406


The vapor-deposited low-density amorphous phase of H2O was directly compressed at 77 kelvin with a diamond-anvil cell, and the boundary between the low-density amorphous phase and the high-density amorphous phase was observed while the sample was warmed under compression. The transition from the low-density amorphous phase to the high-density amorphous phase was distinct and reversible in an apparently narrow pressure range at ∼130 to ∼150 kelvin, which provided experimental evidence for polymorphism in amorphous H2O.