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Pina Martínez, Carlos Manuel and Putnis, Andrew
(2002)
*The kinetics of nucleation of solid solutions from aqueous solutions:
A new model for calculating non-equilibrium distribution coefficients.*
Geochimica et cosmochimica acta, 66
(2).
pp. 185-192.
ISSN 0016-7037

PDF
485kB |

Official URL: http://ees.elsevier.com/gca/mainpage.html

## 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.

Item Type: | Article |
---|---|

Uncontrolled Keywords: | Nucleation kinetics; Solid solutions; Aqueous solutions |

Subjects: | Sciences > Geology > Crystallography |

ID Code: | 14542 |

Deposited On: | 08 Feb 2012 13:16 |

Last Modified: | 11 Dec 2018 08:46 |

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