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Nucleation of solid solutions crystallizing from aqueous solutions

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Putnis, Andrew and Pina Martínez, Carlos Manuel and Astilleros García-Monge, José Manuel and Fernández-Díaz, Lourdes and Prieto Rubio, Manuel (2003) Nucleation of solid solutions crystallizing from aqueous solutions. Philosophical Transactions of the Royal Society of London. Series A, Mathematical, Physical and Engineering Sciences, 361 . pp. 615-632. ISSN 1364-503X

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Abstract

The study of nucleation and growth mechanisms of salts from aqueous solutions, as a function of supersaturation, is described using both macroscopic and microscopic experiments. In situ observations in a fluid cell in an atomic force microscope (AFM) reveal phenomena not accounted for in standard crystal-growth theories, specifically on the role of the crystal structure of the substrate in controlling spiral growth and two-dimensional nucleation. As a model example, the crystallization of two isostructural salts, BaSO4 and SrSO4, is described. The growth of solid-solution crystals is considerably more complex. The supersaturation of a given aqueous solution relative to a solid solution is different with respect to each solid composition, and it leads to the possibility that different compositions can simultaneously grow by different mechanisms on the same crystal face. Oscillatory compositional zoning is another consequence of the interplay between the thermodynamics and the kinetics of nucleation. The factors which control nucleation and growth of the solid solution (Ba,Sr)SO4 from an aqueous solution are described. The predictions made from the theory are compared with direct observations of crystal growth in an AFM.


Item Type:Article
Uncontrolled Keywords:Solid solutions; Crystallization; Two-dimensional nucleation; Spiral growth; Atomic force microscopy
Subjects:Sciences > Geology > Crystallography
ID Code:19897
Deposited On:11 Feb 2013 11:39
Last Modified:11 Dec 2018 08:46

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