论文标题
通过有节奏的生长观察纯化合物中带状的球状石
Observation of banded spherulite in a pure compound by rhythmic growth
论文作者
论文摘要
在某些具有球形对称生长正面的材料中观察到晶体的带状球形生长，并在双折射的周期性变化中观察到。当通过交叉极化者观察时，准二维几何形状中的双折射变化会产生同心干涉色带。在大多数材料中，发现带状的球形是由径向定向扭曲的纤维状晶体形成的。在这里，我们报告了由于由强极杆（如分子）组成的纯净化合物，因此，由于富含同心晶体和晶状体贫困带的节奏生长，形成了带状球形。该化合物在最稳定的固态处表现出无缠绕的原纤维晶体和无定形相的共存。在样品从其熔点上进行足够的过冷冷却时，带状球形是形成带的带状晶状体的径向排列的纤维纤维晶体和无定形固相的周期性变化。我们已经开发了一个依赖时间的金茨堡 - 兰道模型，以说明观察到的带状晶状体生长。
Banded spherulitic growth of crystal is observed in some materials with spherically symmetric growth front and periodic radial variation of birefringence. This variation of birefringence in quasi two dimensional geometry produces concentric interference colour bands when viewed through crossed polarisers. In most materials, the banded spherulites are found to be formed by radially oriented periodically twisted fibrillar crystallites. Here, we report the formation of banded spherulites due to the rhythmic growth of concentric crystallite-rich and crystallite-poor bands for a pure compound consisting of strongly polar rod like molecules. The compound exhibits coexistence of untwisted fibrillar crystallites and an amorphous phase in its most stable solid state. On sufficient supercooling of the sample from its melting point, the banded spherulites are formed with a periodic variation of composition of untwisted radially aligned fibrillar crystallites and an amorphous solid phase. We have developed a time dependent Ginzburg-Landau model to account for the observed banded spherulitic growth.
