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


Astilleros García-Monge, José Manuel and Pina Martínez, Carlos Manuel and Fernández Díaz, Lourdes and Putnis, Andrew (2002) Molecular-scale surface processes during the growth of calcite in the presence of manganese. Geochimica et cosmochimica acta, 66 (18). pp. 3177-3189. ISSN 0016-7037

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Abstract—This paper deals with the growth behaviour of the Mn-Ca-CO3-H2O solid solution-aqueous solution system on calcite {1014} 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-CO3-H2O 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 {1014} 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 {1014} surface microtopography). These phenomena result from the interplay between the controlling parameters and are explained in those terms.

Item Type:Article
Uncontrolled Keywords:Crystal Growth; Molecular Surface; Calcite; Manganese
Subjects:Sciences > Geology > Crystallography
ID Code:14428
Deposited On:19 Jan 2012 12:04
Last Modified:24 Sep 2015 07:49

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