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Crystallization kinetics in binary solid solution–aqueous solution systems

Alexander G. Shtukenberg^*,, Yurii O. Punin^* and Pavel Azimov^**

^* St. Petersburg State University, Universitetskaya emb., 7/9, 199034, St. Petersburg, Russia; sasha{at}as3607.spb.edu
^** Institute of Precambrian Geology and Geochronology, Makarov emb., 2, 199034, St. Petersburg, Russia

Phenomenological description of crystallization kinetics in a binary system "aqueous solution–solid solution" is given. This approach involves consideration of the true equilibrium and possible quasi-equilibrium states. It gives description of the crystallization kinetics close to equilibrium and features of the growth process occurring at high driving forces and growth rates. Special attention is paid to interactions between an aqueous solution and a seed crystal placed into this solution. In particular, this includes analysis of pure chemical interactions as well as effect of misfit strain. The theory developed predicts the growth/dissolution rate of a mixed crystal based on the knowledge of phase diagram and growth kinetics of the end members of the series. The key point of the paper is discussion of supersaturation concept in such aqueous solution–solid solution systems.