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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Metastable Solid Phase at the Crystalline-Amorphous Border:The Glacial Phase of Triphenyl Phosphite
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Metastable Solid Phase at the Crystalline-Amorphous Border:The Glacial Phase of Triphenyl Phosphite

机译：晶体-非晶边界处的亚稳固相：亚磷酸三苯酯的冰期

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摘要

The fragile glass-forming liquid triphenyl phosphite(TPP) melts at 298K,has a glass transition at about 186 K,and can undergo a first order transition to a metastable,solid,apparently amorphous phase (denoted the glacial phase) at about 230K.Though apparently amorphous (on the basis of preliminary X-ray data),we have shown that the glacial phase is well described as a plastic crystal composed of nanocrystallites;it is thus not a second liquid or glass nor a poor ordinary molecular crystal.This picture of the glacial phase with its close connection to the supercooled liquid from which it forms is placed in the context of the frustrationlimited-domain theory of supercooled liquids,and the glacial phase is associated with the defect-ordered phase predicted by that theory.In examining the applicability of this picture,we carried out extensive experimental studies,many of them by means of NMR at both ambient and high pressures,on the glacial phase and on the dynamics of the transformations to and from this phase.
机译：易碎的玻璃形成液状亚磷酸三苯酯（TPP）在298K时熔融，在约186 K时发生玻璃化转变，并且在约230 K时可经历一阶转变为亚稳固的表观非晶态相（称为冰期）。尽管显然是非晶态的（基于初步的X射线数据），但我们已经表明，冰河相被很好地描述为由纳米微晶组成的塑性晶体;因此它不是第二种液体或玻璃，也不是不良的普通分子晶体。与过冷液体紧密相连的冰期图片是在过冷液体的挫折有限域理论的背景下进行的，而冰期与该理论预测的缺陷有序相有关。为了检查这张图片的适用性，我们进行了广泛的实验研究，其中许多实验是在大气压和高压下，在冰期和转化动力学上通过NMR进行的。往返于此阶段。

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