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Title: Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses

Journal Article · · Journal of Physical Chemistry Letters

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, Vol. 9, Issue 19; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (5)

Predicting Complex Relaxation Processes in Metallic Glass journal September 2019
Structural origin for vibration-induced accelerated aging and rejuvenation in metallic glasses journal May 2019
A microscopic look at the Johari-Goldstein relaxation in a hydrogen-bonded glass-former journal October 2019
Uncovering β-relaxations in amorphous phase-change materials journal January 2020
Uncovering β-relaxations in amorphous phase-change materials text January 2020

Figures / Tables (4)


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