Abstract
The phenomenon of kinetic roughening is used to study the step free energy on the (110)-faces of naphthalene crystals growing form a ternary solution of naphthalene, toluene and n-hexane. Keeping the mole fraction of naphthalene in the solution constant—which implies that the heat of dissolution divided by the temperature is constant—we varied the toluene-n-hexane composition. In order to calculate the supersaturation from the undercooling the relevant part of the phase diagram of the ternary system is studied and discussed in the framework of the regular solution model. The classical Jackson model for the solid-liquid interface predicts that the step energy is proportional to the heat of dissolution. In contradiction to this the step free energy increases with increasing hexane concentration in our experiment. We show that it is impossible to repair the Jackson model by inclusion of the (usually neglected) wetting phenomena. A model for the solid-liquid interface is proposed in which the flat aromatic mo...
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