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arXiv 0705.0626cond-mat.stat-mechcond-mat.soft
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理解过冷Lennard-Jones混合物的脆性。I.局部优先结构

Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

D. Coslovich, G. Pastore

摘要:

通过分子动力学模拟揭示了不同过冷Lennard-Jones二元混合物中等压脆性的系统变化。通过Voronoi结构分析了脆性和局部结构之间的联系。我们发现,集群的粒子属于本地首选的结构形成缓慢,长寿命的域,其空间扩展的温度降低而增加。作为一般规则,在过冷时,这种畴的更快速的增长与更明显的超阿耳忒修斯行为有关,因此与更大的脆性有关。

英文摘要:

We reveal the existence of systematic variations of isobaric fragility in different supercooled Lennard-Jones binary mixtures by performing molecular dynamics simulations. The connection between fragility and local structures in the bulk is analyzed by means of a Voronoi construction. We find that clusters of particles belonging to locally preferred structures form slow, long-lived domains, whose spatial extension increases by decreasing temperature. As a general rule, a more rapid growth, upon supercooling, of such domains is associated to a more pronounced super-Arrhenius behavior, hence to a larger fragility.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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