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Cubic ice can be formed directly in the water phase of vitrified aqueous solutions.

This study addresses the possibility that ice-Ic may form spontaneously and directly during the cooling of previously freeze-concentrated aqueous solutions, at temperatures where the residual unfrozen water is likely to exist in small, isolated domains. It is shown that on cooling a dilute aqueous glucose solution, ice-Ih crystallises initially, but when the solution has been freeze-concentrated to ca.10 mol %, further cooling results in the slow nucleation and growth of ice-Ic in the residual water domains, rather than on the pre-existing ice-Ih crystal surfaces.