Unveiling the medium-range order in glass models and its role in glass formation

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2020-06-04
Authors
Fan, Xinyu
Sun, Yang
Wang, Cai-Zhuang
Ho, Kai-Ming
Altman, M. S.
Huang, Li
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Ames National LaboratoryPhysics and Astronomy
Abstract

The correlation between structure and glass formability in glassy systems is a long-standing puzzle. To solve this puzzle, many descriptors based on the short-range order (SRO) have been proposed. Here we show that the SRO, however, offers little help in explaining the glass formability and stability; instead it is the formation of medium-range order that stabilizes the glass against crystallization by suppressing the atomic rearrangement and compositional change. Our results provide a perspective for understanding the correlation between structure and stability in glasses

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