Does impurity-induced step-bunching invalidate key assumptions of the Cabrera - Vermilyea model?

Ristic RI; DeYoreo JJ; Chew CM

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Does impurity-induced step-bunching invalidate key assumptions of the Cabrera - Vermilyea model?

机译：杂质引起的分步聚束是否会使Cabrera-Vermilyea模型的关键假设无效？

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We show that the growth recovery mechanism of the {110} faces on crystals of the pharmaceutical paracetamol in the presence of its intrinsic impurity acetanilide occurs in the same way as in the growth of inorganic KH2PO4 (KDP) crystals with Fe(III) and AI(III) impurities, by initial movement of macrosteps while elementary steps remain pinned. This suggests that the mechanism of recovery by activation of elementary step motion assumed by Cabrera and Vermilyea (C-V) is not applicable to a diverse set of common and technologically important crystal systems. Recognizing that impurity-driven macrostep formation depends on an imbalance in the concentration ahead and behind the step, we propose a general condition that must be met for a crystal-impurity system to behave according to the C-V predictions.

机译：我们表明，{110}面在对乙酰氨基酚上存在固有杂质乙酰胺的情况下，其晶体的恢复生长机理与在用Fe（III）和AI的无机KH2PO4（KDP）晶体中的生长相同。（III）杂质，通过宏步的初始移动而基本步保持固定状态。这表明由Cabrera和Vermilyea（C-V）承担的通过激活基本步进运动来恢复的机制不适用于多种常见且对技术重要的晶体系统。认识到杂质驱动的宏观台阶形成取决于台阶前后浓度的不平衡，我们提出了晶体-杂质系统根据C-V预测行为必须满足的一般条件。

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《Crystal growth & design》 |2008年第4期|共4页
作者
Ristic RI; DeYoreo JJ; Chew CM;
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正文语种 eng
中图分类晶体学;
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SOLUTION GROWTH; CRYSTALS;

机译：解决方案增长;晶体;

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Does impurity-induced step-bunching invalidate key assumptions of the Cabrera - Vermilyea model?

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