Mineral precipitation and dissolution in aqueous solution: in-situ microscopic observations on barite (001) with atomic force microscopy

Bosbach, Dirk; Hall, Christopher; Putnis, Andrew

doi:10.1016/s0009-2541(98)00076-x

Cited by 113 publications

(119 citation statements)

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“…Thus, while sharp boundaries of the islands are invariably parallel to (120) straight PBC directions, rough bound aries are related to (010) zigzag PBCs (actually such boundaries consist of a number of vicinal faces parallel to (120) directions). This structural control of the shape of two-dimensional celestite islands is similar to that observed during the development of pure barite islands on barite (00 1) sur faces [9,10,12]. Circular sector-shaped barite is lands are also bounded by straight edges parallel to (120) directions and a third curved edge.…”

Section: Qgu)supporting

confidence: 75%

Epitaxial growth of celestite on barite (0 0 1) face at a molecular scale

et al. 2005

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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 (00 I) surfaces. Solution supersaturation, {3celestite, was varied from I to 45.7 ({3celestite = a(Sr2+). a(SO�-)IKs p , cel)' At supersaturations below 10 neither two-dimensional nucleation neither step advancement are observed on barite (001 ) surfaces. However, once the two-dimensional nucleation barrier is overcome ({3celes tite> 10), nuclei preferentially form on cleavage steps parallel to [1 00], [1 10] and [120] 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 (00 I) face and {21 O} and {lOO} forms and can be explained on the basis of PBC theory, The coalescence of such islands results in the formation of a homogeneous SrS04layer. Growth rates along [00 I] direc tion have been measured for the whole supersaturation range. The growth rate equation for "Birth and Spread" crystal growth mechanism has been successfully fitted to our experimental data. The fitting process has provided basic growth parameters in a good agreement with theoretical ones. Both the high transitional supersaturation required for two dimensional nucleation and the high interfacial energy value obtained from the fitting of the "Birth and Spread" equa tion (O'ociibar = 0.137 J 1m2) indicate low affinity of SrS04 growth units for barite (00 I) faces. This is consistent with the relative high mismatch between celestite and barite structure, The behaviour of the epitaxial growth described in this work can help to interpret the oscillatory zoning frequently occurring in both natural and synthetic crystals of the BaxSrl_xS04 solid solution.

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Section: Qgu)supporting

confidence: 75%

Epitaxial growth of celestite on barite (0 0 1) face at a molecular scale

et al. 2005

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“…Fluids of varying supersaturations were passed over the substrate and processes such as step advancement, spiral growth and two-dimensional nucleation observed. The experi mental details can be found in Bosbach et al (1998) In classical homogeneous nucleation theory, the theoretical nucleation rate, J, i.e. the number of nuclei formed per unit volume and time, is given by (Nielsen 1964) …”

Section: Methodsmentioning

confidence: 99%

Nucleation of solid solutions crystallizing from aqueous solutions

Putnis

Pina

Astilleros

et al. 2003

Philosophical Transactions of the Royal Society of London. Seri

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The study of nucleation and growth mechanisms of salts from aqueous solutions, as a function of supersaturation, is described using both macroscopic and micro scopic experiments. In situ observations in a fluid cell in an atomic force microscope (AFM) reveal phenomena not accounted for in standard crystal-growth theories, specifically on the role of the crystal structure of the substrate in controlling spiral growth and two-dimensional nucleation. As a model example, the crystallization of two isostructural salts, Ba804 and 8r804, is described. The growth of solid-solution crystals is considerably more complex. The supersaturation of a given aqueous solu tion relative to a solid solution is different with respect to each solid composition, and it leads to the possibility that different compositions can simultaneously grow by different mechanisms on the same crystal face. Oscillatory compositional zoning is another consequence of the interplay between the thermodynamics and the kinetics of nucleation. The factors which control nucleation and growth of the solid solution (Ba,8r)804 from an aqueous solution are described. The predictions made from the theory are compared with direct observations of crystal growth in an AFM.

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“…Quantitative measurements of velocity versus supersaturation are found in the literature for a variety of solution grown crystals including minerals such as calcite [33,34], barite [35,36], hydroxyapatite [37]; optical crystals such as ammonium dihydrogen phosphate (ADP) [38] and potassium dihydrogen phosphate (KDP) [39]; several proteins [40][41][42][43][44]; and organic crystals such as hydrogen bonded tapes [45] and uric acid [46]. Land and De Yoreo tabulate kinetic coefficients for several systems [41] demonstrating that they vary over several orders of magnitude.…”

Section: Measuring Step Velocitymentioning

confidence: 99%

The Use of Scanning Probe Microscopy to Investigate Crystal-Fluid Interfaces

Orme¹,

Giocondi²

2007

AIP Conference Proceedings

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Abstract. Over the past decade there has been a natural drive to extend the investigation of dynamic surfaces in fluid environments to higher resolution characterization tools. Various aspects of solution crystal growth have been directly visualized for the first time. These include island nucleation and growth using transmission electron microscopy and scanning tunneling microscopy; elemental step motion using scanning probe microscopy; and the time evolution of interfacial atomic structure using various diffraction techniques. In this lecture we will discuss the use of one such in situ method, scanning probe microscopy, as a means of measuring surface dynamics during crystal growth and dissolution. We will cover both practical aspects of imaging such as environmental control, fluid flow, and electrochemical manipulation, as well as the types of physical measurements that can be made. Measurements such as step motion, critical lengths, nucleation density, and step fluctuations, will be put in context of the information they provide about mechanistic processes at surfaces using examples from metal and mineral crystal growth.

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Mineral precipitation and dissolution in aqueous solution: in-situ microscopic observations on barite (001) with atomic force microscopy

Cited by 113 publications

References 50 publications

Epitaxial growth of celestite on barite (0 0 1) face at a molecular scale

Epitaxial growth of celestite on barite (0 0 1) face at a molecular scale

Nucleation of solid solutions crystallizing from aqueous solutions

The Use of Scanning Probe Microscopy to Investigate Crystal-Fluid Interfaces

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