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Supersaturation evolution and first precipitate location in crystal growth in gels; application to barium and strontium carbonates

Prieto, M. and Fernández Díaz, Lourdes and López Andrés, Sol (1989) Supersaturation evolution and first precipitate location in crystal growth in gels; application to barium and strontium carbonates. Journal of Crystal Growth , 98 (3). pp. 447-460. ISSN 0022-0248

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Abstract

Supersaturation is not enough to interpret nucleation behavior in crystal growth in gels. The explanation for the first precipitate location needs complementary crystalization criteria. The experimental testing of both mass-transfer and pH evolution is the
background to establish rigorous hypotheses. From these data, the actual distribution of free ions, ionic associations and
supersaturation throughout the gel collumn may be found. In the case of nucleation of strontianite and witherite crystals, although the
critical supersaturation conditions remain necessary, a second concept, the "equality range" of the reagent concentrations, has to be
introdud to account for observations. With these dual conditions, the behaviour of the described gel-diffusion system is correctly
reproduced. The significance of pH evolution is also experimentauy shown. Nucleation density and growth mechanisms are finally
explained on the base to supersaturation rate and kinetic roughness.


Item Type:Article
Uncontrolled Keywords:Crystal growth; Gel application
Subjects:Sciences > Geology > Crystallography
ID Code:10573
Deposited On:29 Apr 2010 11:31
Last Modified:29 Apr 2010 11:31

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