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A study of the solidification of supercooled liquid benzophenone (BZP) is presented. As is well-known, liquid BZP can be extensively supercooled without crystallization or glass formation. In the experiments, the BZP liquid -solid phase transition is activated by either seeding or momentary freezing (using liquid nitrogen) of a portion of liquid. Measurements of the position of the liquidsolid interface as a function of time are reported. In the case of seeding, the temperature dependence of the interface propagation is examined over a range exceeding 120 K. BZP solidification is found to occur via two modes, each demonstrating its own distinct kinetics and morphology. For purposes of comparison, results of experiments with 4,4'-dimethylbenzophenone are also presented. A cellular model for BZP solidification and liquid metastability is offered.

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