从密堆积到拓扑密堆积：中等多分散硬球混合物中Laves相的形成
From Close-Packed to Topologically Close-Packed: Formation of Laves Phases in Moderately Polydisperse Hard-Sphere Mixtures
摘要：
粒度多分散性可有助于抑制硬球流体在高填充分数下结晶成密堆积结构，因此通常用于产生模型玻璃形成系统。尽管如此，已知具有适度多分散性的硬球混合物仍然具有有序的基态。在这里，我们通过计算机模拟表明，硬球混合物的颗粒尺寸的基础上增加多分散性frackets，和双峰子群有利于形成拓扑紧密堆积的C14和C15 Laves相共存的无序相。这一结果的一般性是支持模拟的硬球混合物的粒度分布的四种不同的形式。
英文摘要：
Particle size polydispersity can help to inhibit crystallization of the hard-sphere fluid into close-packed structures at high packing fractions and thus is often employed to create model glass-forming systems. Nonetheless, it is known that hard-sphere mixtures with modest polydispersity still have ordered ground states. Here, we demonstrate by computer simulation that hard-sphere mixtures with increased polydispersity fractionate on the basis of particle size, and a bimodal subpopulation favors formation of topologically close-packed C14 and C15 Laves phases in coexistence with a disordered phase. The generality of this result is supported by simulations of hard-sphere mixtures with particle-size distributions of four different forms.
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