Crystal defects and the dissolution kinetics of rutile

Casey, William H.; Carr, M. J.; Graham, R. A.

doi:10.1016/0016-7037(88)90224-4

Cited by 73 publications

(18 citation statements)

References 21 publications

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“…The overall rate for various etch pit densities converges to the single etch pit rate, except for an initial short transient time. This prediction is in accord with experimental investigations (31)(32)(33)(34) and resolves a long-standing problem in water-rock kinetics.…”

supporting

confidence: 89%

Variation of Crystal Dissolution Rate Based on a Dissolution Stepwave Model

Lasaga

Lüttge

2001

Science

438

335

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A formulation based on defect-generated dissolution stepwaves of the variation of dissolution rate with the degree of undersaturation is validated by near-atomic-scale observations of surfaces, Monte Carlo simulations, and experimental bulk dissolution rates. The dissolution stepwaves emanating from etch pits provide a train of steps similar to those of a spiral but with different behavior. Their role in accounting for the bulk dissolution rate of crystals provides a conceptual framework for mineral dissolution far from equilibrium. Furthermore, the law extends research to conditions closer to equilibrium and predicts a nonlinear decrease in the rate of dissolution as equilibrium is approached, which has implications for understanding artificial and natural processes involving solid-fluid reactions.

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supporting

confidence: 89%

Variation of Crystal Dissolution Rate Based on a Dissolution Stepwave Model

Lasaga

Lüttge

2001

Science

438

335

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“…Our observations of the process indicate that, among others, the spacing between the steps increases with increasing distance from the axis of the etched pit, which is in accord with the model. Similar processes have previously been observed [25][26][27][28][29][30][31][32][33].…”

Section: Resultssupporting

confidence: 88%

AFM studies of pits formation on KBr(1 0 0) during its dissolution by water

Pers

Barwiński

Grodzicki

et al. 2016

Materials Science-Poland

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The formation of etch pits along screw dislocations on KBr(1 0 0) surface during its dissolution by water is investigated by means of atomic force microscopy (AFM). Clean KBr(1 0 0) is obtained by cleavage. A weak solution of water in isopropyl alcohol is used to investigate the etching in real time. Observations of the etch pit evolution with etching time show that concentration of atomic steps on the pit walls and dissolution rate of the walls vary up to complete dissolution of the screw dislocation. The screw dislocation removal stabilizes the dissolution, resulting in constant values of atomic steps concentration on the pit walls and their dissolution rate during further etching, which continues according to the crystal dissolution stepwave model. It was found that the movement of AFM scanning tip essentially affected the etching process.

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“…The density of dislocations, however, has been found to exert no more than a weak influence on the surface area normalized dissolution rate when minerals have been dissolved in the laboratory (Casey et al, 1988;Cygan et al, 1989;Schott et al, 1989;Blum and Lasaga, 1990). The weakness of this relationship has been attributed to the relatively small fraction of surface sites whose reactivity is influenced by dislocations (Schott et al, 1989).…”

Section: Weak Influence Of Defects On Surface Area Normalized Dissolumentioning

confidence: 93%