Abstract
Measurements have been made of the chromium and Cl - uptake by ammonium dihydrogen phosphate (ADP) crystals growing in aqueous solutions containing up to 1000 ppm of CrCl 3·6H 2O. The possible nature of the incorporated chromium species is discussed. The effects of trace amounts (up to 100 ppm) of CrCl 3·6H 2O, FeCl 3 and AlCl 3 on the growth kinetics of the {101} faces of ADP crystals are also reported. Under these conditions growth was a non-steady state process. The results are interpreted in terms of entry of impurity species into the adsorbed surface layer and their subsequent interference with the rate controlling surface processes.
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