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We determined bulk crystal nucleation rates in aqueous suspensions of chargedspheres at low metastability. Experiments were performed in dependence onelectrolyte concen-tration and for two different particle number densities. Thetime-dependent nucleation rate shows a pronounced initial peak, whilepost-solidification crystal size distributions are skewed towards largercrystallite sizes. At each concentration, the nucleation rate density initiallydrops exponentially with increasing salt concentration. The complete data set,however, shows an unexpected scaling of the nucleation rate densities withmet-astability times the number density of particles. Parameterization of ourresults in terms of Classical Nucleation Theory reveals unusually lowinterfacial free energies of the nu-cleus surfaces and nucleation barriers wellbelow the thermal energy. We tentatively attribute our observations to thepresence of doublets introduced by the employed con-ditioning technique andacting as nucleation seeds.

Peaked bulk crystal nucleation in charged sphere melts from salt concentration dependent crystallization experiments at very low metastability