论文标题
拉曼对冰IC -ICE IH转化的调查
Raman Investigation of the Ice Ic - Ice Ih Transformation
论文作者
论文摘要
在许多冰I中，在自然界中存在的冰I中存在两个不同的结构，即稳定的六边形（IH）或亚稳态的立方（IC）。直到最近发现以结构纯净的形式获取它的简单途径，对立方冰IC进行了准确的分析。 Here we report a Raman spectroscopy study of the transformation of metastable ice Ic into the stable form Ih, by applying a very slow temperature ramp to the ice Ic samples initially at 150 K. The thermal behavior of the spectroscopic features originating from the lattice and OH-stretching vibrational modes was carefully measured, identifying the thermodynamic conditions of the Ic-Ih transition and the dynamics of both structure with remarkable accuracy.此外，对转化动力学的两个测定的比较也允许估计此转换过程的激活能量。
Among the many ice polymorphs, ice I, that is present in nature at ambient pressure, occurs with two different structures, i.e. the stable hexagonal (Ih) or the metastable cubic (Ic) one. An accurate analysis of cubic ice Ic was missing until the recent discovery of an easy route to obtain it in a structurally pure form. Here we report a Raman spectroscopy study of the transformation of metastable ice Ic into the stable form Ih, by applying a very slow temperature ramp to the ice Ic samples initially at 150 K. The thermal behavior of the spectroscopic features originating from the lattice and OH-stretching vibrational modes was carefully measured, identifying the thermodynamic conditions of the Ic-Ih transition and the dynamics of both structure with remarkable accuracy. Moreover, the comparison of two determinations of the transformation kinetics allowed also to provide an estimation of the activation energy for this transformation process.
