Control of the fragility of a glass-forming liquid using the liquid-liquid phase transition
Control of the fragility of a glass-forming liquid using the liquid-liquid phase transition
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DOI：
10.1103/physrevlett.95.065701
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发表时间：
2005-08-05
影响因子：
8.6
通讯作者：
Tanaka, H
中科院分区：
文献类型：
--
作者：
Kurita, R;Tanaka, H
当液体接近其玻璃化转变温度T-g时，结构弛豫时间τ显著增加。这种基本特征是普遍存在的，但这种tau的增加可以使用T-g作为缩放参数在强极端和脆弱极端之间进行分类。液体，其τ服从阿耳忒弥斯定律，被称为“强”，而“脆弱”的液体具有超阿耳忒弥斯行为。在这里，我们报告的第一个连续控制的液体的脆性相同的材料在很宽的范围内的脆弱性，使用连续的液体-液体过渡。我们的研究清楚地表明，脆弱性不是一个特定的材料量，但控制的序参数控制的液-液转变，这可能是局部有利的结构在液体中的分数。
When a liquid approaches its glass-transition temperatures T-g, the structural relaxation time tau dramatically increases. This basic feature is ubiquitous, but this increase of tau can be classified between strong and fragile extremes using T-g as a scaling parameter. Liquids, whose tau obeys the Arrhenius law, are called "strong," while "fragile" liquids have the super-Arrhenius behavior. Here we report the first continuous control of the fragility of liquid of the same material over a wide range of fragility, using a continuous liquid-liquid transition. Our study clearly demonstrates that the fragility is not a material-specific quantity, but is controlled by the order parameter governing the liquid-liquid transition, which may be the fraction of locally favored structures in the liquid.