Abstract
The rates of growth and dissolution of aluminium fluoride trihydrate crystals, AlF3·3H2O, in aqueous solution were measured as a function of the saturation ratio S = CCs (0<S<6) and of the temperature (30<=t<=85°C). Both growth and dissolution follow parabolic rate laws. The growth rates measured can be quantitatively accounted for by assuming that the rate determining step is the integration jump of the growth units into lattice positions at kinks, the rate of this elementary step being that of dissociation of a water molecule or a fluoride ion from the inner coordination sphere of the aluminium ion. The dissolution rate may have a similar mechanism.
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