Epitaxial Freezing of Supercooled Droplets on Ice Surfaces

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The structure and orientation of ice crystals in a water droplet frozen on a prismatic or a basal plane of ice substrate at temperature down to -23℃ were investigated. On the prismatic plane above -20℃ the droplet froze into a single crystal, which had the same orientation as the substrate ; between -21℃ and -23℃ about 30% of the droplets polycrystallized, at least one of the crystals in the droplet having the same orientation as the substrate. Meanwhile, on the basal plane the droplet always froze into a single crystal above -10℃, while at -11℃ about 50% of the droplets and at -14℃ and below all of them polycrystallized. In most cases of monocrystallization on the basal plane, the crystal had the same orientation as the substrate, but a misorientation resulting from a rotation of the crystal by less than 10°around the c-axis was found in a few cases of freezing at -11℃ or below. In case of the polycrystallized droplet no crystal had the same orientation as the substrate, differently from the polycrystallization on the prismatic plane. Instead, every crystal and the substrate had in common the direction of one of the a-axes each other ; and the c-axis of the former was parallel to the direction of one of the 0-0 bonds of the latter other than the one paralled to the c-axis of the former. As for the polycrystallized droplet frozen below -18℃ on the basal plane the number of crystals was large and all possible six orientations were usually realized, giving a hexagonal arrangement of Laue spots specific to them.
北海道大学の論文
1984-03-28

Epitaxial Freezing of Supercooled Droplets on Ice Surfaces

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