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Nanoscale anglesite growth on the celestite (001) face.

Pina Martínez, Carlos Manuel and Rico García, Aida (2009) Nanoscale anglesite growth on the celestite (001) face. Surface science, 603 (17). pp. 2708-2713. ISSN 0039-6028

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Abstract

In situ atomic force microscopy (AFM) was used to study the growth behaviour of anglesite (PbSO4) monolayers on the celestite (001) face. Growth was promoted by exposing the celestite cleavage surfaces to aqueous solutions that were supersaturated with respect to anglesite. The solution supersaturation, βang, was varied from 1.05 to 3.09 (where βang = a(Pb2+)•a(SO42-)/Ksp,ang). In this range of supersaturation, two single anglesite monolayers (~3.5 Å in height each) from pre-existent celestite steps were grown. However, for solution supersaturation of the values of βang < 1.89 +- 0.06, subsequent multilayer growth is strongly inhibited. AFM observations indicate that the inhibition of a continuous layer-by-layer growth of anglesite on the celestite (001) face is due to the in-plane strain generated by the slight difference between the anglesite and celestite lattice parameters (i.e. the linear misfits are lower than 1.1%). The minimum supersaturation required to overcome the energy barrier for multilayer growth gave an estimate of the in-plane strain energy: 11.4 +/- 0.6 mJ/m2. Once this energy barrier is overcome, a multilayer Frank–van der Merwe epitaxial growth was observed.


Item Type:Article
Uncontrolled Keywords:Surface topography, Atomic force microscopy, Crystal Growth Epitaxy, Aqueous solutions, Solid–liquid interfaces, Celestite, Anglesite
Subjects:Sciences > Geology > Crystallography
Sciences > Geology > Mineralogy
ID Code:9579
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Deposited On:12 Nov 2009 17:10
Last Modified:06 Feb 2014 08:28

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