Abstract
Nucleation of transparent organic substances in supercooled melts under vibration (50 Hz, 1–5 mm) has been studied experimentally. In the absence of a seeding crystal, vibration did not affect nucleation within the whole range of melt supercoolings studied, ΔT= 0.1–10 K. The introduction of a seeding crystal provides a threshold supercooling ΔT* below which no nucleation occurs at all, whereas above it, an explosion-like nucleation is observed. It is shown that mass growth of small crystals at ΔT>ΔT* is not associated with the detachment of growing-crystal fragments and seems to be explained by three-dimensional nucleation on the surface of a seeding crystal.
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