Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses
Journal Article
·
· Journal of Physical Chemistry Letters
- Huazhong University of Science and Technology, Hubei (China)
- Ames Lab., Ames, IA (United States); Tsinghua Univ., Beijing (China)
- Ames Lab., Ames, IA (United States)
- Tsinghua Univ., Beijing (China)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Univ. Gottingen, Gottingen (Germany)
In glassy materials, the Johari–Goldstein secondary (β) relaxation is crucial to many properties as it is directly related to local atomic motions. However, a long-standing puzzle remains elusive: why some glasses exhibit β relaxations as pronounced peaks while others present as unobvious excess wings? Using microsecond atomistic simulation of two model metallic glasses (MGs), we demonstrate that such a difference is associated with the number of string-like collective atomic jumps. Relative to that of excess wings, we find that MGs having pronounced β relaxations contain larger numbers of such jumps. Structurally, they are promoted by the higher tendency of cage-breaking events of their neighbors. Furthermore, our results provide atomistic insights for different signatures of the β relaxation that could be helpful for understanding the low-temperature dynamics and properties of MGs.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1478229
- Report Number(s):
- IS-J--9788
- Journal Information:
- Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 19 Vol. 9; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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