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Catalytic effect of the impurities on growth of KAP and KDP crystals

New experimental results concerning the influence of impurities on growth kinetics of KAP and KDP crystals are presented. The above crystals were chosen for these studies because apart from being useful technologically, they are very different one from another in structure and chemical nature. The organic impurities which were used in our experiments differ by chemical class causing different mechanisms of their influence on crystallization. In almost all experiments, however, the increase in crystal growth rate was observed for very low additives concentration, while an analogous decrease was observed for greater impurity concentrations. We call such an effect of increase in the growth rate: catalytic effect, and it was observed for 'tailor-made' additives too. The results are interpreted theoretically in terms of reduction in the edge free energy caused by additive adsorption at the step edge.