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

机译:杂质对KAP和KDP晶体生长的催化作用

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Abstract: 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. !15
机译:摘要:提出了有关杂质对KAP和KDP晶体生长动力学影响的新实验结果。选择上述晶体用于这些研究是因为除了在技术上有用之外,它们在结构和化学性质上也彼此非常不同。我们的实验中使用的有机杂质因化学类别而异,从而导致其影响结晶的机制不同。然而,在几乎所有的实验中,对于非常低的添加剂浓度,都观察到晶体生长速率的增加,而对于较大的杂质浓度,则观察到类似的降低。我们称这种增加增长率的效果为催化效果,也发现了“量身定做”的添加剂。从理论上解释了结果的减少,这是由于台阶边缘处的添加剂吸附所导致的边缘自由能的减少。 !15

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