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Recovery of surfaces from impurity poisoning during crystal growth

Nature volume 399, pages 442–445 (1999)Cite this article

Abstract

Growth and dissolution of crystal surfaces are central to processes as diverse as pharmaceutical manufacturing1,2, corrosion3, single-crystal production4 and mineralization in geochemical and biological environments5,6. Impurities are either unavoidable features of these processes or intentionally introduced to modify the products. Those that act as inhibiting agents induce a so-called ‘dead zone’, a regime of low supersaturation where growth ceases. Models based on the classic theory of Cabrera and Vermilyea7 explain behaviour near the dead zone in terms of the pinning of elementary step motion by impurities8,9. Despite general acceptance of this theory, a number of commonly investigated systems exhibit behaviour not predicted by such models10. Moreover, no clear microscopic picture of impurity–step interactions currently exists. Here we use atomic force microscopy to investigate the potassium dihydrogen phosphate {100} surface as it emerges from the dead zone. We show that traditional models are not able to account for the behaviour of this system because they consider only elementary steps, whereas it is the propagation of macrosteps (bunches of monolayer steps) that leads to resurrection of growthout of the dead zone. We present a simple physical model of this process that includes macrosteps and relates characteristics of growth near the dead zone to the timescale for impurity adsorption.

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Figure 1: Dependence of step velocity on supersaturation in the presence of Fe3+ contamination.
Figure 2: The process of impurity poisoning of the steps at constant supersaturation.
Figure 3: Changes in elementary step and macrostep dynamics with increasing supersaturation.

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Acknowledgements

We thank L. Carman for providing the starting solutions, R. Torres for chemical analyses, P. Rock and W. Casey for use of equipment, and the NSF for support. This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory.

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Authors and Affiliations

  1. Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, 94550, California, USA

    Terry A. Land, Sergey Potapenko, G. Tayhas Palmore & James J. De Yoreo

  2. Department of Chemistry, University of California at Davis, Davis, 95616, California, USA

    Tracie L. Martin

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  1. Terry A. Land
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  2. Tracie L. Martin
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  3. Sergey Potapenko
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  4. G. Tayhas Palmore
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  5. James J. De Yoreo
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Correspondence to Terry A. Land.

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Land, T., Martin, T., Potapenko, S. et al. Recovery of surfaces from impurity poisoning during crystal growth. Nature 399, 442–445 (1999). https://doi.org/10.1038/20886

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