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New transformations between crystalline and amorphous iceHigh-pressure optical and spectroscopic techniques were used to obtain directly the ice I(h) - hda-ice transformation in a diamond-anvil cell, and the stability of the amorphous form is examined as functions of pressure and temperature. It is demonstrated that hda-ice transforms abruptly at 4 GPa and 77 K to a crystalline phase close in structure to orientationally disordered ice-VII and to a more highly ordered, ice-VIII-like structure at higher temperatures. This is the first time that an amorphous solid is observed to convert to a crystalline solid at low temperatures by compression alone. Phase transitions of this type may be relevant on icy planetary satellites, and there may also be implications for the high-pressure behavior of silica.
Document ID
19890050198
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hemley, R. J.
(Carnegie Institution of Washington Washington, DC, United States)
Chen, L. C.
(Carnegie Institution of Washington Washington, DC, United States)
Mao, H. K.
(Carnegie Institution of Washington Washington, DC, United States)
Date Acquired
August 14, 2013
Publication Date
April 20, 1989
Publication Information
Publication: Nature
Volume: 338
ISSN: 0028-0836
Subject Category
Thermodynamics And Statistical Physics
Accession Number
89A37569
Distribution Limits
Public
Copyright
Other

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