Abstract
The kinetics of crystal growth of magnesium fluoride has been studied under conditions in which the supersaturation was maintained constant by the addition of mixed titrant solutions containing lattice ions and controlled by a specific fluoride ion electrode. Crystallization is governed by a surface process and the apparent reaction order with respect to supersaturation, α, changed with concentration. The reaction order was 1.8 at low supersaturation (0.4 < α < 0.8), and 5.0 at higher concentrations of magnesium fluoride (1.0 < α < 1.6). The results suggest that the magnesium fluoride grows by a polynuclear mechanism at higher supersaturations while at lower concentrations, a spiral growth model is more appropriate.
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