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首页> 外文期刊>Crystal growth & design >Rough growth behavior of a polar steroid crystal: A case of polymorphic self-poisoning?
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Rough growth behavior of a polar steroid crystal: A case of polymorphic self-poisoning?

机译：极性类固醇晶体的粗糙生长行为：多态性自毒的情况？

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摘要

The polar shape of the stable polymorph of the steroid crystal 7 alpha MNa is a consequence of different growth rates in the opposite crystallographic directions [010] and [0 (1) over bar0]. Using various microscopic techniques, it is shown that the surface morphologies of the opposite (010) and (0 (1) over bar0) faces are completely different, regardless of the conditions of growth or etching. The (0 (1) over bar0) face is flat and grows via a spiral growth mechanism, whereas the (010) face and faces close to it are rough. In situ microscopy shows that in many cases these latter faces are hampered in growth. The aberrant growth behavior of this group of faces is explained to be a result of the presence of an ultrathin layer of the metastable polymorphic form covering the surface, even under conditions at which the bulk metastable form is undersaturated. This layer retards growth and introduces roughening.
机译：类固醇晶体7αMNa的稳定多晶型物的极性形状是在相反的晶体学方向[010]和[0（1）在bar0]上不同的生长速率的结果。使用各种显微技术表明，相对的（010）和（bar0）上的（0（1））面的表面形态完全不同，无论生长或蚀刻的条件如何。 （bar0上方的（0（1））面是平坦的，并且通过螺旋形生长机制生长，而（010）面和靠近它的面是粗糙的。原位显微镜显示，在许多情况下，这些后面的面在生长中受到阻碍。这组面孔的异常生长行为被解释为是即使覆盖了整体亚稳态形式的不饱和条件，也存在覆盖表面的亚稳态多晶型形式的超薄层的结果。该层阻碍了生长并引入了粗糙化。

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