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Effect of organic impurities on the surface morphology and growth mechanism of KBP crystals (C8H5O4K)

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Abstract

The surface morphology of the (010) face of potassium biphthalate (KBP) crystals grown from aqueous solutions under the supersaturation ranging within 0.029–0.04 has been studied by the methods of optical and electron microscopies. It was revealed that the (010) surface has polygonal growth macrohills of the dislocation nature, small hillocks developing by the mechanism of successive two-dimensional nucleation, and numerous two-dimensional nuclei. The density of small hillocks (104–105 cm−2) exceeds the dislocation density in KBP crystals by one to two orders of magnitude. It is shown that at low supersaturations, the (010) face grows simultaneously by the dislocation mechanism and the mechanism of successive two-dimensional nucleation. It is also established that the tangential velocity of growth-step motion on the (010) face increases in the presence of organic impurities. This effect can be used as one of the factors increasing the growth rates of crystal faces at low impurity concentrations (the so-called catalytic effect of impurities).

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia

    V. A. Kuznetsov & T. M. Okhrimenko

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 109017, Russia

    N. D. Samotoin

Authors
  1. V. A. Kuznetsov
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  2. N. D. Samotoin
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  3. T. M. Okhrimenko
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__________

Translated from Kristallografiya, Vol. 46, No. 1, 2001, pp. 136–143.

Original Russian Text Copyright © 2001 by Kuznetsov, Samotoin, Okhrimenko.

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Kuznetsov, V.A., Samotoin, N.D. & Okhrimenko, T.M. Effect of organic impurities on the surface morphology and growth mechanism of KBP crystals (C8H5O4K). Crystallogr. Rep. 46, 126–132 (2001). https://doi.org/10.1134/1.1343140

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