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首页> 外文期刊>Physica, A. Statistical mechanics and its applications >Crossover from fragile liquids to strong liquids near the glass transition created by isotropic two-body short-range interactions
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Crossover from fragile liquids to strong liquids near the glass transition created by isotropic two-body short-range interactions

机译：各向同性两体短程相互作用在玻璃化转变附近从易碎液体过渡到强液体

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摘要

The extensive molecular-dynamics simulations on binary mixtures A _(80)B_(20) with a Stillinger-Weber potential are performed to obtain two types of glass-forming liquids near the glass transition, fragile and strong liquids. The simulations are done for different mass ratios Q(= ~(mB/mA)) under the same potential with ~(mA) being fixed, where ~(mα) denotes a mass of α particle. The simulation results for the self-diffusion coefficient D are then analyzed by two types of master curves recently proposed as D=~(d0)x-~1(~(1-x)2)~(+η)exp[62x3~(+η)(~(1-x)2+η)] with η=4/3 for fragile liquids and 5/3 for strong liquids, where x is a reduced inverse temperature and ~(d0) a positive constant. Then, it is shown that for Q<~(Qc) the simulation results for the diffusion coefficient obey the fragile master curve with η=4/3, while for Q>~(Qc) they obey the strong master curve with η=5/3, where ~(Qc)?20. The structural relaxation time ~(τα) and the β-relaxation time ~(τβ) are also shown to obey the power laws recently proposed as ~(τα～D-~((1+μ)) and ~(τβ)～D-~((1-μ)) in a supercooled region, respectively, while ~(τα)～~(τβ)～D- ~(2/3) in a liquid region, where μ=2/(3(η+2)). Here μ?1/5 for fragile liquids and 2/11 for strong liquids. These situations are exactly the same as those in usual glass-forming liquids. Thus, it is emphasized that two types of glass-forming liquids can be simply created by simple short-range potentials.
机译：对具有Stillinger-Weber势的二元混合物A _（80）B_（20）进行了广泛的分子动力学模拟，以获得接近玻璃化转变的两种类型的玻璃形成液体：易碎液体和强液体。在相同电势下，对不同质量比Q（=〜（mB / mA））进行模拟，其中〜（mA）固定，其中〜（mα）表示α粒子的质量。然后通过最近提出的两种主曲线分析自扩散系数D的仿真结果，即D =〜（d0）x-〜1（〜（1-x）2）〜（+η）exp [62x3〜 （+η）（〜（1-x）2 +η）]，对于易碎液体，η= 4/3，对于强液体，η= 4/3，其中x是降低的逆温度，而〜（d0）是正常数。然后表明，对于Q <〜（Qc），扩散系数的模拟结果服从η= 4/3的易碎主曲线，而对于Q>〜（Qc），它们遵循η= 5的强主曲线/ 3，其中〜（Qc）？20。还表明结构弛豫时间〜（τα）和β松弛时间〜（τβ）符合最近提出的幂定律，即〜（τα〜D-〜（（1 +μ））和〜（τβ）〜D -〜（（1-μ））在过冷区域中，而〜（τα）～~（τβ）〜D-〜（2/3）在液体区域中，其中μ= 2 /（3（η+ 2））。这里，易碎液体的μ？1/5和强液体的2/11，这些情况与通常的玻璃形成液完全相同，因此要强调的是，两种类型的玻璃形成液可以由简单的短程电势简单地创建。

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