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Science 18 October 1991:
Vol. 254. no. 5030, pp. 406 - 408
DOI: 10.1126/science.254.5030.406
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Articles

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

OSAMU MISHIMA 1, K. TAKEMURA 1, and K. AOKI 2

1 National Institute for Research in Inorganic Materials, 1-1, Namiki, Tsukuba, Ibaraki 305, Japan
2 National Chemical Laboratory for Industry, 1-1, Higashi, Tsukuba, Ibaraki 305, Japan

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 sim130 to sim150 kelvin, which provided experimental evidence for polymorphism in amorphous H2O.

Submitted on April 16, 1991
Accepted on August 13, 1991


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Science. ISSN 0036-8075 (print), 1095-9203 (online)