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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Collectivity of motion in undercooled liquids and amorphous solids
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Collectivity of motion in undercooled liquids and amorphous solids

机译：过冷液体和无定形固体中的运动集合

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摘要

The motion of the structure determining components is highly collective, both in amorphous solids and in undercooled liquids. This has been deduced from experimental low temperature data in the tunneling regime as well as from the vanishing isotope effect in diffusion in glasses and undercooled liquids. In molecular dynamics simulations of glasses one observes that both low frequency resonant vibrations and atomic jumps are centered on more than 10 atoms which, in densely packed materials, form chain-like structures. With increasing temperature the number of atoms jumping collectively increases. These chains of collectively jumping atoms are also seen in undercooled liquids. Collectivity only vanishes at higher temperatures. This collectivity is intimately related to the dynamic heterogeneity which causes a non-Gaussianity of the atomic displacements. (C) 2002 Published by Elsevier Science B.V. [References: 48]
机译：结构决定组分的运动在无定形固体和过冷液体中都是高度集中的。这是根据隧穿状态下的实验低温数据以及玻璃和过冷液体扩散中消失的同位素效应得出的。在玻璃的分子动力学模拟中，人们观察到低频共振振动和原子跃迁都集中在10个以上的原子上，这些原子在密集堆积的材料中形成链状结构。随着温度的升高，原子跳跃的数量会共同增加。这些集体跳跃的原子链也出现在过冷的液体中。集体只有在更高的温度下才会消失。这种集体性与引起原子位移具有非高斯性的动态异质性密切相关。 （C）2002由Elsevier Science B.V.出版[参考文献：48]

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