Frustration on the way to crystallization in glass
Frustration on the way to crystallization in glass
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DOI：
10.1038/nphys235
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发表时间：
2006-03-01
期刊：
影响因子：
19.6
通讯作者：
Tanaka, H
中科院分区：
文献类型：
--
作者：
Shintani, H;Tanaka, H
有些液体在熔点以下不会结晶，而是进入过冷状态，并在冷却时最终在玻璃化转变温度下变成玻璃。在此过程中，液体动力学不仅急剧减慢，而且逐渐变得更加不均匀。动力学减慢与动态异质性增长之间的关系是液体玻璃化转变的关键问题。在这里，我们通过使用具有结晶基态的液体模型来研究这个问题，为此我们可以系统地控制结晶的挫折。我们发现，在熔点以下出现具有高度结晶有序的缓慢区域，并且它们的特征尺寸和寿命在冷却时急剧增加。这些晶体区域导致动态异质性，表明与复杂的自由能景观以及由此产生的缓慢动态的联系。这些发现表明玻璃化转变和结晶之间存在内在联系。
Some liquids do not crystallize below the melting point, but instead enter into a supercooled state and on cooling eventually become a glass at the glass-transition temperature. During this process, the liquid dynamics not only drastically slow down, but also become progressively more heterogeneous. The relationship between the kinetic slowing down and growing dynamic heterogeneity is a key problem of the liquid-glass transition. Here, we study this problem by using a liquid model, with a crystalline ground state, for which we can systematically control frustration against crystallization. We found that slow regions having a high degree of crystalline order emerge below the melting point, and their characteristic size and lifetime increase steeply on cooling. These crystalline regions lead to dynamic heterogeneity, suggesting a connection to the complex free-energy landscape and the resulting slow dynamics. These findings point towards an intrinsic link between the glass transition and crystallization.