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

Hai Bin Yu, Meng Hao Yang, Yang Sun, Feng Zhang, Jian Bo Liu, C. Z. Wang, K. M. Ho, Ranko Richert, Konrad Samwer

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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. 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.

Original languageEnglish (US)
Pages (from-to)5877-5883
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume9
Issue number19
DOIs
StatePublished - Oct 4 2018

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Metallic glass
metallic glasses
wings
Glass
tendencies
strings
signatures
glass
Temperature
simulation

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Yu, H. B., Yang, M. H., Sun, Y., Zhang, F., Liu, J. B., Wang, C. Z., ... Samwer, K. (2018). Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses. Journal of Physical Chemistry Letters, 9(19), 5877-5883. https://doi.org/10.1021/acs.jpclett.8b02629

Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses. / Yu, Hai Bin; Yang, Meng Hao; Sun, Yang; Zhang, Feng; Liu, Jian Bo; Wang, C. Z.; Ho, K. M.; Richert, Ranko; Samwer, Konrad.

In: Journal of Physical Chemistry Letters, Vol. 9, No. 19, 04.10.2018, p. 5877-5883.

Research output: Contribution to journalArticle

Yu, Hai Bin ; Yang, Meng Hao ; Sun, Yang ; Zhang, Feng ; Liu, Jian Bo ; Wang, C. Z. ; Ho, K. M. ; Richert, Ranko ; Samwer, Konrad. / Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses. In: Journal of Physical Chemistry Letters. 2018 ; Vol. 9, No. 19. pp. 5877-5883.
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