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Growth Kinetics and Bipyramid-Face Morphology of KDP Crystals

  • L. N. Rashkovich
  • G. T. Moldazhanova
Chapter
Part of the Poct Kpиctaллob / Rost Kristallov / Growth of Crystals book series (GROC, volume 20)

Abstract

In contrast with the prism faces of KDP crystals, the growth of bipyramid faces is much less sensitive to solution impurities [1–5]. Possibly for this reason they are less studied. Hundreds of articles on the crystallization and properties of KDP crystals have appeared during the 60 years that they have been grown. However, questions concerning the shape of dislocation hillocks, the role of surface diffusion, and the effects of pH and impurities on the kinetic coefficient and linear energy of the steps are still unanswered. In the present work, special attention is paid to the effect of pH on the step kinetics since such studies have not yet been performed.

Keywords

Kinetic Coefficient Step Movement Step Velocity Ammonium Dihydrogen Phosphate Solubility Isotherm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R. J. Davey and J. W. Mullin, “A mechanism for the habit modification of ammonium dihydrogen phosphate crystals in the presence of ionic species in aqueous solution,” Krist. Tech., 11, No. 3, 229–233 (1976).CrossRefGoogle Scholar
  2. 2.
    C. Belouet, “Growth and characterization of single crystals of KDP family,” Prog. Cryst. Growth Charact, 3, No. 2/3, 121–156 (1980).CrossRefGoogle Scholar
  3. 3.
    B. Dam and W. P. G. van Enckevort, “In situ observation of surface phenomena on {100} and {101} potassium dihydrogen phosphate crystals,” J. Cryst. Growth, 69, No. 2/3, 306–316 (1984).CrossRefGoogle Scholar
  4. 4.
    G. M. Loiacono, “Crystal growth of KH2PO4,” Ferroelectrics, 71, No. 1, 49–60 (1987).CrossRefGoogle Scholar
  5. 5.
    L. N. Rashkovich, KDP-Family Single Crystals, Adam Hilger, Bristol (1990).Google Scholar
  6. 6.
    R. J. van Rosmalen, Crystal Growth Processes, Thesis, University of Delft (1977).Google Scholar
  7. 7.
    L. G. Berg, “Solubility isotherm in the ternary system K2O-P2O5-H2O at 25°C,” Izv. Akad. Nauk SSSR, Ser. Khim., No. 1, 147–160 (1938); “Solubility isotherm in the ternary system K2O-P2O5-H2O at 50°C,” ibid., 161–166.Google Scholar
  8. 8.
    L. N. Rashkovich, A. A. Mkrtchyan, and A. A. Chernov, “Morphology and kinetic growth of (100) faces of ADP from aqueous solution,” Kristallografiya, 30, No. 2, 380–387 (1985).Google Scholar
  9. 9.
    P. G. Vekilov, Yu. G. Kuznetsov, and A. A. Chernov, “Interstep interaction in solution growth: (101) ADP face,” J. Cryst. Growth, 121, No. 3, 643–655 (1992).CrossRefGoogle Scholar
  10. 10.
    L. N. Rashkovich and B. Yu. Shekunov, “Influence of impurities on growth kinetics and morphology of prismatic faces of ADP and KDP crystals,” in: Growth of Crystals, Vol. 18, E. I. Givargizov and S. A. Grinberg (eds.), Consultants Bureau, New York (1992), pp. 124–139.Google Scholar
  11. 11.
    L. N. Rashkovich and G. T. Moldazhanova, “Effect of solution acidity on growth kinetics of KDP crystals,” Kristallografiya, 38, No. 1, 135–140 (1993).Google Scholar
  12. 12.
    V. V. Voronkov and L. N. Rashkovich, “Effect of a mobile adsorbed impurity on step movement,” Kristallografiya, 37, No. 3, 559–570 (1992).Google Scholar
  13. 13.
    V. V. Voronkov and L. N. Rashkovich, “Step kinetics in the presence of mobile absorbed impurity,” J. Cryst. Growth, 144, No. 1/2, 107–115 (1994).CrossRefGoogle Scholar
  14. 14.
    W. J. P. van Enckevort, R. J. van Rosmalen, and W. H. van der Linden, “Evidence of spiral growth on the pyramidal faces of KDP and ADP single crystals,” J. Cryst. Growth, 49, No. 3, 502–514 (1980).CrossRefGoogle Scholar
  15. 15.
    H. Hilscher, “Microscopic investigation of morphological structures on the pyramidal faces of KDP and DKDP single crystals,” Cryst. Res. Technol., 20, No. 10, 1351–1361 (1985).CrossRefGoogle Scholar

Copyright information

© Consultants Bureau, New York 1996

Authors and Affiliations

  • L. N. Rashkovich
  • G. T. Moldazhanova

There are no affiliations available

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