Crystallization kinetics in binary solid solution-aqueous solution systems

Abstract

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.

How well suited are current thermodynamic models to predict or interpret the composition of (Ba,Sr)SO4 solid-solutions in geothermal scalings?

“…Glynn 2000or Bruno 2007). Nevertheless, one may think of kinetic controls on solidsolution formation, which may result in solid compositions, which should on the basis of thermodynamic considerations not be achievable (Shtukenberg et al 2006) (i.e. inside the spinodal gap).…”

Charge Compensation in Solid Solutions

“…[2][3][4] However, some of the fundamental principles of their formation have not yet been understood. [5][6][7] Among them is charge compensation: substitution of matrix ions by foreign ions of different charge (in the present case substitution of Ca 2+ by Cm 3+ or Eu 3+ ions) requires compensation of the excess charge. Several competing mechanisms have been proposed, [8][9][10] but to date none has been unambiguously proven or disproven.…”

Method to Study the Primary Nucleation for Solid Solution: Application to Uranium-Neodymium Oxalate Coprecipitation

“…The way that the driving force should be defined is still controversial [16,17]. Shtukenberg et al [11] propose to evaluate the supersaturation using Lippmann's approach, whereas Astilleros et al [8] developed two formulations, the first one based on the stoichiometric saturation concept [18] and the second one based on the actual activity concept [8].…”