Abstract
The structure of ice samples formed in the decay of a water impurity gel at temperatures above 4 K and atmospheric pressure has been examined. The X-ray diffraction analysis indicates that three phases coexist in the initial sample at temperatures of 85–110 K. These phases are amorphous ice occupying up to 30% of the sample volume, cubic-phase ice I c metastable at low pressures (∼60%), and normal hexagonal ice I h (≤6%). The characteristic sizes of crystals of the cubic and hexagonal phases are about 6 and 30 nm, respectively. The amorphous phase at annealing above 110 K is gradually transformed to the crystalline phase both cubic and hexagonal. This transition is accompanied by two processes, including a fast increase in the sizes of cubicphase nanocrystals and the partial transition of the cubic phase I c to the hexagonal one I h. Hexagonal ice I h prevails in the bulk of the sample above 200 K.
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Original Russian Text © V.B. Efimov, A.N. Izotov, A.A. Levchenko, L.P. Mezhov-Deglin, S.S. Khasanov, 2011, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 94, No. 8, pp. 662–667.
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Efimov, V.B., Izotov, A.N., Levchenko, A.A. et al. Structural transitions in ice samples at low temperatures and pressures. Jetp Lett. 94, 621–625 (2011). https://doi.org/10.1134/S0021364011200021
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DOI: https://doi.org/10.1134/S0021364011200021