RT Journal Article
T1 Nanoscale phenomena during the growth of solid solutions oncalcite {101¯4} surfaces
A1 Astilleros García-Monge, José Manuel
A1 Pina Martínez, Carlos Manuel
A1 Fernández Díaz, Lurdes
A1 Prieto Rubio, Manuel
A1 Putnis, Andrew
AB 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.
PB Elsevier Science B.V., Amsterdam.
SN 0009-2541
YR 2006
FD 2006
LK https://hdl.handle.net/20.500.14352/49790
UL https://hdl.handle.net/20.500.14352/49790
LA eng
DS Docta Complutense
RD 15 may 2024