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Nanoscale phenomena during the growth of solid solutions on calcite {101¯4} surfaces


Astilleros García-Monge, José Manuel and Pina Martínez, Carlos Manuel and Fernández Díaz, Lourdes and Prieto Rubio, Manuel and Putnis, Andrew (2006) Nanoscale phenomena during the growth of solid solutions on calcite {101¯4} surfaces. Chemical geology, 225 . pp. 322-335. ISSN 0009-2541

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This work deals with the growth behaviour of calcite {101¯4} surfaces in contact with multicomponent aqueous solutions containing divalent cations (Ba2+, Sr2+, Mn2+, Cd2+, or Mg2+). The result is the formation of solid solutions, with calcite or aragonite as one of the end-members. In situ atomic force microscopy has revealed a wide variety of surface phenomena occurring during the formation of these solid solutions. Among them are: (1) the thickening of growth steps and the subsequent dissolution of surfaces followed by the nucleation of secondary three-dimensional nuclei on calcite surfaces, (2) the transition between growth mechanisms, (3) the formation of an epitaxial layer that armours the substrate from further dissolution and (4) the inhibitory effect of the newly formed surface on the subsequent growth (template effect). The two last phenomena can considerably limit coprecipitation as an effective mechanism for divalent metal uptake. All the phenomena described are a consequence of the interplay between thermodynamics, supersaturation of the aqueous solution with respect to the possible solid solutions and the crystallographic control of the surfaces on the cation incorporation, and indicates that there are many differences between the crystal growth of solid solutions and phases with fixed composition.

Item Type:Article
Uncontrolled Keywords:Calcite; Solid solution–aqueous solution; Atomic force microscopy; Crystal growth; Mineral surfaces
Subjects:Sciences > Geology > Crystallography
ID Code:14467
Deposited On:24 Jan 2012 12:44
Last Modified:24 Sep 2015 07:42

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