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Published December 1, 1964 | public
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Ice VII, the densest form of ice


In the pressure range 0-25 kilobars there occur 7 different crystalline modifications of ice,(1) whereas from 25 kbar up to the highest pressure so far tried, 200 kbar, only a single form occurs:(2) ice VII, of density about 1.7 gm cm^-3. Ice VII thus seems in some sense to be an "ultimate" crystalline form of ice, and its structure is therefore of considerable interest, particularly in relation to the structures of the lower-pressure forms, for which some information is already available.(3, 4)

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Copyright © 1964 by the National Academy of Sciences. Communicated by Linus Pauling, October 19, 1964. This paper is a joint contribution from the Division of the Geological Sciences, California Institute of Technology (no. 1301) and from the Institute of Geophysics and Planetary Physics, University of California, Los Angeles (no. 404). The experimental work was carried out at the latter institution, through the kind cooperation of George C. Kennedy and Leason H. Adams. The work was supported in part by grants from the National Science Foundation.


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