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Metastable phenomena on calcite {1014} surfaces growing from Sr2+–Ca2+–CO3 2- aqueous solutions

Astilleros García-Monge, José Manuel and Pina Martínez, Carlos Manuel and Fernández Díaz, Lourdes and Putnis, Andrew (2003) Metastable phenomena on calcite {1014} surfaces growing from Sr2+–Ca2+–CO3 2- aqueous solutions. Chemical geology, 193 . pp. 93-107. ISSN 0009-2541

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Abstract

In situ atomic force microscopy (AFM) experiments, scanning electron microscopy (SEM) imaging and composition
analysis, and X-ray diffraction have provided information about the growth, dissolution and transformation processes promoted
by Sr2 + –Ca2 + –CO3
2 aqueous solutions in contact with calcite {101¯4} surfaces. Experiments have shown a wide variety of
surface phenomena, such as the influence of the Sr-bearing newly-formed surface on the subsequent growth (template effect),
the growth and subsequent dissolution of surfaces and the nucleation of secondary three-dimensional nuclei on calcite surfaces.
These phenomena reveal the metastability of the crystallisation system and are a consequence of the interplay between
thermodynamics (the relative stability of the two calcite and aragonite structure solid solutions that can be formed),
supersaturation of the aqueous solution with respect to the two possible solid solutions, and the crystallographic control of the
surfaces on cation incorporation.

Item Type:Article
Uncontrolled Keywords:Solid solution–aqueous solution; Atomic force microscopy; Crystal growth; Calcite; Strontium carbonates
Subjects:Sciences > Geology > Crystallography
ID Code:14118
Deposited On:16 Jan 2012 11:28
Last Modified:16 Jan 2012 11:28

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