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Epitaxial Growth of Celestite on Barite (0 0 1) Face at a Molecular Scale by Nuria Sánchez-Pastor; Carlos M. Pina; José Manuel Astilleros; Lurdes Fernández-Díaz; Andrew Putnis is a Physics and Astronomy article available to read on EtoBox.

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In situ AFM experiments have been conducted in order to obtain information about kinetics of celestite epitaxial growth on barite. Growth has been promoted by passing aqueous solutions supersaturated with respect to celestite over freshly cleaved barite (0 0 1) surfaces. Solution supersaturation, b celestite , was varied from 1 to 45.7 ðb celestite 1⁄4 aðSr 2þ Þ Á aðSO 2À 4 Þ=K sp;cel Þ. At supersaturations below 10 neither two-dimensional nucleation neither step advancement are observed on barite (0 0 1) surfaces. However, once the two-dimensional nucleation barrier is overcome (b celes- tite > 10), nuclei preferentially form on cleavage steps parallel to [1 0 0], [1 1 0] and [1 2 0] directions and more scarcely on terraces. The subsequent growth of two-dimensional nuclei leads to the development of celestite ''islands''. Their morphology is defined by (0 0 1) face and {2 1 0} and {1 0 0} forms and can be explained on the basis of PBC theory. The coalescence of such islands results in the formation of a homogeneous SrSO 4 layer. Growth rates along [0 0 1] direction have been measured for the whole supersaturation range. The growth rate equation for ''Birth and Spread'' crystal gro

Who reads Epitaxial Growth of Celestite on Barite (0 0 1) Face at a Molecular Scale?

Author

Nuria Sánchez-Pastor; Carlos M. Pina; José Manuel Astilleros; Lurdes Fernández-Díaz; Andrew Putnis

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0039-6028)

Published

2005

Language

EN

Field

Physics and Astronomy (Physical Sciences)