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Phenomenological theory of the dissolution/precipitation kinetics of a solid solution; determination of the precipitated composition, comparison with the choices of the literature

Abstract : We propose elements for a theory of the dissolution/precipitation kinetics of a solid solution, at a homogenized macroscopic scale where the phenomena occurring in the volume of solids are not taken into account. The variables of chemical disequilibrium are the chemical affinities. In the literature, the treatment of solid solutions is different from that of stoichiometric compounds. One of the concerns that guided us is to connect the two formalisms and to consider a solid solution as the limiting case of an infinite set of stoichiometric minerals of similar compositions. This allows us to integrate in a general framework a number of concepts developed specifically for solid solutions (opposition total saturation / stoichiometric saturation) and to link them to what is known for minerals of fixed composition; for this, we must specify the notions of stability / metastability for solid solutions. This makes possible a certain unification of kinetic theories and relieves a number of paradoxes. The different precipitation/dissolution rates of the solid solution compositions for a given fluid are visualized by the pedal curve of the corresponding point to the total saturation curve. The presentation is illustrated by examples of binary ideal solutions: extensions, as well as research avenues, are indicated.
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https://halshs.archives-ouvertes.fr/halshs-02946452
Contributor : Bernard Guy <>
Submitted on : Wednesday, September 23, 2020 - 10:31:53 AM
Last modification on : Saturday, September 26, 2020 - 3:05:18 AM
Long-term archiving on: : Friday, December 4, 2020 - 6:52:46 PM

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Bernard Guy. Phenomenological theory of the dissolution/precipitation kinetics of a solid solution; determination of the precipitated composition, comparison with the choices of the literature. 2020. ⟨halshs-02946452⟩

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