Abstract
Formation of a preferred texture in the unidirectional growth of polycrystalline ice from impure melt is governed by constitutional supercooling and "fast" kinetics of solidification in directions of the basal plane. The encroachment of crystals with vertical C axis (Cv grains) by the others takes place immediately by a mechanism of "fast" kinetics and/or by a lateral growth via nucleation of new basal platelets in a constitutionally supercooled melt. The first mechanism is expected to be much faster in eliminating the Cv grains than the second, which explains the peculiar presence of some Cv crystals at relatively large ice thicknesses.
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