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Nanoscale observations of the effect of cobalt on calcite growth and dissolution

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Freij, Sawsan J. and Putnis, Andrew and Astilleros García-Monge, José Manuel (2004) Nanoscale observations of the effect of cobalt on calcite growth and dissolution. Journal of Crystal Growth , 267 . pp. 288-300. ISSN 0022-0248

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Abstract

In situ atomic force microscopy has been used to study the effect of dissolved cobalt on the growth and dissolution of
calcite {10.4} surfaces. Growth experiments conducted in the presence of various cobalt concentrations revealed that
the growth of the first layer proceeds with step growth and is faster than the growth in pure solution. The subsequent
growth on the newly formed surfaces is much slower, although the solution supersaturation is kept constant. This
difference in the step velocity leads to the temporary reproduction of the original surface topography (template effect).
This demonstrates the role of the substrate surface structure in the crystal growth. In situ dissolution experiments
conducted in the presence of cobalt revealed that cobalt is sorbed at the negative (acute) kinks leading to the formation
of monomolecular semi-triangular etch pits.


Item Type:Article
Uncontrolled Keywords:Atomic force microscopy; Impurities; Solid solutions; Growth from solution; Minerals
Subjects:Sciences > Geology > Crystallography
ID Code:18104
Deposited On:31 Jan 2013 12:15
Last Modified:11 Dec 2018 08:46

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