Metastability
in solid solution growth
Journal of Crystal Growth Volume 275, Issues 1-2 , 15 February 2005,
Pages e211-e217
Marija Matovic, J.C. van Miltenburg and Jan Los
Abstract
Crystallization of binary mixtures of 1,4-dichlorobenzene and
1,4-dibromobenzene is examined in an adiabatic calorimeter. First
heated to 380 K under adiabatic conditions and thus transformed into a
binary melt, the mixture was slowly cooled to 250 K. The experimental
cooling curves (the recorded change of mixture's temperature with time)
obtained for the various compositions of the issued mixture, served for
the specification of enthalpy change of the mixture during
crystallization. In order to demonstrate the importance of the kinetics
during an even slow crystallization process, the experimental data will
be interpreted in terms of a kinetic model as opposed to the
traditionally used equilibrium approach. We will show that kinetic
model can serve for the derivation of excess parameters that
characterize the degree of mixing in the phases.