Publication: The kinetics of nucleation of solid solutions from aqueous solutions:
A new model for calculating non-equilibrium distribution coefficients.
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Publication Date
2002
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Elsevier Science Ltd
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Abstract
The nucleation kinetics of binary solid solutions, with general formula BxC1xA, crystallising
from aqueous solution can be described using a generalised expression for the nucleation rate: the function,
J(x), in which supersaturation, interfacial free energy and other parameters of the classical nucleation rate
equation are considered as functions of the solid composition. As an example, we studied the behaviour of
such J(x) functions for the case of the (Ba,Sr)SO4 and (Ba,Sr)CO3 solid solutions. J(x) functions are very
sensitive to slight changes in the composition of the aqueous solution, which result in strong modifications of
the nucleation kinetics. The implications of the relationship between supersaturation and nucleation rate
functions for the general nucleation behaviour in solid solution-aqueous solution (SS-AS) systems are
discussed. Finally, we present a method for constructing non-equilibrium Roozeboom diagrams based on the
nucleation kinetics in SS-AS systems. Our Roozeboom diagrams calculated for different departures from
equilibrium conditions are consistent with previous experimental work and they can be used to predict actual
distribution coefficients.