Molecular-scale surface processes during the growth of calcite in the presence of manganese

Details Molecular-scale surface processes during the growth of calcite in the presence of manganese Molecular-scale surface processes during the growth of calcite in the presence of manganese

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gecoa..66.3177a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 66, Issue 18, pp.3177-3189

Physics

9

Scientific paper

This paper deals with the growth behaviour of the Mn-Ca-CO 3 -H 2 O solid solution-aqueous solution system on calcite {104} surfaces. This system represents a model example, which allows us to study the effect of a number of controlling factors on the crystallisation: (1) the supersaturation function, (x), and nucleation rate function, J(x) , for the Mn-Ca-CO 3 -H 2 O system, (2) the relationship of such functions to the molecular scale growth mechanisms operating on growing surfaces, and (3) the surface structure of the calcite {104} faces. In situ atomic force microscopy (AFM) growth experiments revealed a wide variety of surface phenomena, such as the transition between growth mechanisms, anisotropic changes in the step rates, and the influence of the Mn-bearing newly formed surface on subsequent growth (step stoppage followed by the formation of two-dimensional nuclei and the reproduction of the original calcite {104} surface microtopography). These phenomena result from the interplay between the controlling parameters and are explained in those terms.

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