Exploring the structure of glass-forming liquids using high energy X-ray diffraction, containerless methodology and molecular dynamics simulation

Exploring the structure of glass-forming liquids using high energy X-ray diffraction, containerless methodology and molecular dynamics simulation
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利用高能 X 射线衍射、无容器方法和分子动力学模拟探索玻璃形成液体的结构

DOI:
10.1016/j.nocx.2019.100027
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发表时间:
2019
期刊:
X
影响因子:
--
通讯作者:
Wilding M
Wilding M
中科院分区:
--
文献类型:
--
作者:
Wilding M

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高能 X 射线衍射可以与无容器技术相结合,提供玻璃形成液体中稳定和亚稳态状态下原子排列的信息。高入射能量为高散射矢量值提供大量衍射数据,从而能够对影响粘度和晶体成核等重要物理性质的局部和中程有序进行更稳健的分析。这些组合技术已应用于一系列氧化物液体。在这篇文章中,我们通过控制允许研究液体含有铁的氧分压来说明向相空间添加更多维度。快速数据采集的优势也在亚碲酸盐玻璃形成系统的研究中得到了证明,其中显示了深度过冷液体中从遍历状态到非遍历状态的转变。最后,我们演示了如何通过将 HEXRD 与分子动力学模拟相结合来开发液体结构的描述。
High energy X-ray diffraction can be combined with containerless techniques to provide information on the atomic arrangements in glass-forming liquids in stable and metastable regimes. The high incident energies provide bulk diffraction data to high values of scattering vector which enables significantly more robust analysis of the local and medium-range order that influences important physical properties such as viscosity and crystal nucleation. These combined techniques have been applied to a range of oxide liquids. In this contribution we illustrate addition of further dimensions to phase space by controlling the partial pressure of oxygen that permits the study liquids containing iron. The advantages of rapid data acquisition are also demonstrated in a study of tellurite glass-forming systems where a transition from ergodic to non-ergodic regimes in the deeply supercooled liquid is shown. Finally we demonstrate how descriptions of the liquid structure can be developed by combining HEXRD with molecular dynamics simulations.
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