New transformations between crystalline and amorphous ice

Details New transformations between crystalline and amorphous ice New transformations between crystalline and amorphous ice

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..638h&link_type=abstract

Nature (ISSN 0028-0836), vol. 338, April 20, 1989, p. 638-640. Research supported by NASA, NSF, and Carnegie Institution of Wash

Computer Science

78

Amorphous Materials, Crystallinity, Ice, Phase Transformations, Phase Diagrams, Planetary Geology, Raman Spectra

Scientific paper

High-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.

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