Russian Mineralogical Society
2nd International Conference "Crystallogenesis and Mineralogy"
The growth kinetics of the {100} faces of KDP crystals in non-stoichiometric solutions

RMS-DPI code:  2007-1-6-0
Scientific session:  Session 1. Fundamental problems of crystallogenesis
Author listing:  Vorontsov D.A., Portnov V.N., Ershov V.P.
Principal author:  Vorontsov Dmitry Anatolievich
Language:  Russian
Abstract - Summary 
(short description):
In this paper, the growth kinetics of the {100} faces of KDP (KH2PO4) crystals has been studied in non-stoichiometric solutions with H3PO4 and KOH additives. The normal growth rate has been measured by the precision laser polarization interference technique in a temperature-controlled cell under artificial convection regime. It has been shown that the growth rate increases at a fixed temperature 50C and supersaturation 0.04 with deviation of a solution from the stoichiometric composition. On the basis of the material balance condition, principle of solution electro-neutrality, and data of phosphoric acid dissociation the system of equations has been made and solved for the particle concentrations in KDP solutions. The increase of the growth rate of KDP has been compared to the change of the particle concentrations in dependence on the solution stoichiometry. It has been made an assumption that K+ and H3PO4 in H3PO4 doped solutions and K+ and HPO42- ions in solutions with KOH are responsible for the mass transfer between the growing KDP crystal and bulk solution.
RMS-DPI code:  2007-1-6-0
Proceeedings volume 
in the RMS catalogue:
Crystallogenesis and Mineralogy
Pages:  8-10
File of proceedings 
 280 K
Status:  printed
Recieved:  02/05/2007
Accepted:  14/05/2007
Published on-line:  21/12/2007
Permanent address of publication:
Contact author(s):  Vorontsov, Dmitry Anatolievich

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