Phys. Rev. Lett. 89, 205503 (2002) [4 pages]Structure of a New Dense Amorphous Ice
The detailed structure of a new dense amorphous ice, VHDA, is determined by isotope substitution neutron diffraction. Its structure is characterized by a doubled occupancy of the stabilizing interstitial location that was found in high density amorphous ice, HDA. As would be expected for a thermally activated unlocking of the stabilizing “interstitial,” the transition from VHDA to LDA (low-density amorphous ice) is very sharp. Although its higher density makes VHDA a better candidate than HDA for a physical manifestation of the second putative liquid phase of water, as for the HDA case, the VHDA to LDA transition also appears to be kinetically controlled. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.205503
DOI:
10.1103/PhysRevLett.89.205503
PACS:
61.43.Fs, 61.12.–q
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