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arXiv 1501.02457cond-mat.soft
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密度标度区的Adam-Gibbs模型及其对组态熵标度的意义

Adam-Gibbs model in the density scaling regime and its implications for the configurational entropy scaling

Elzbieta Masiewicz, Andrzej Grzybowski, Katarzyna Grzybowska, Sebastian Pawlus, Jürgen Pionteck, Marian Paluch

摘要:

为了解决凝聚态物理学中一个长期存在的问题,确定一个适当的描述的时间尺度的分子动力学玻璃化转变附近的热力学演化,我们扩展了著名的亚当-吉布斯模型来描述温度-体积依赖的结构弛豫时间,$τ_α (T,V)$。我们采用的热力学标度的想法,反映在密度标度幂律,$τ_α=f(T^{-1} V^{-γ} ) $,最近被公认为一个有效的统一概念,在玻璃化转变物理,物理相关和不相关的尝试之间的区别制定的温度-体积表示的亚当-吉布斯模型。因此,我们确定了结构弛豫时间$τ_α$和构型熵$S_c$之间的直接关系,证明了具有指数γ的$S_c (T,V)=g(T^{-1} V^{-γ} )$也可以缩放$τ_α (T,V)$。这一重要发现对玻璃化转变附近的热力学和分子动力学之间的联系具有重要意义,因为它意味着$τ_α$可以用$S_c$缩放。

英文摘要:

To solve a long-standing problem of condensed matter physics with determining a proper description of the thermodynamic evolution of the time scale of molecular dynamics near the glass transition, we extend the well-known Adam-Gibbs model to describe the temperature-volume dependence of structural relaxation times, $τ_α (T,V)$. We employ the thermodynamic scaling idea reflected in the density scaling power law, $τ_α=f(T^{-1} V^{-γ} ) $, recently acknowledged as a valid unifying concept in the glass transition physics, to discriminate between physically relevant and irrelevant attempts at formulating the temperature-volume representations of the Adam-Gibbs model. As a consequence, we determine a straightforward relation between the structural relaxation time $τ_α$ and the configurational entropy $S_c$, giving evidence that also $S_c (T,V)=g(T^{-1} V^{-γ} )$ with the exponent γ that enables to scale $τ_α (T,V)$. This important finding has meaningful implications for the linkage between thermodynamics and molecular dynamics near the glass transition, because it implies that $τ_α$ can be scaled with $S_c$.

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