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Fundamental Link between ß 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.
Afiliação
  • Yu HB; Wuhan National High Magnetic Field Center and School of Physics , Huazhong University of Science and Technology , WuHan , Hubei 430074 , China.
  • Yang MH; Ames Laboratory, U.S. Department of Energy , Ames , Iowa 50011 , United States.
  • Sun Y; Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China.
  • Zhang F; Ames Laboratory, U.S. Department of Energy , Ames , Iowa 50011 , United States.
  • Liu JB; Ames Laboratory, U.S. Department of Energy , Ames , Iowa 50011 , United States.
  • Wang CZ; Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China.
  • Ho KM; Ames Laboratory, U.S. Department of Energy , Ames , Iowa 50011 , United States.
  • Richert R; Department of Physics , Iowa State University , Ames , Iowa 50011 , United States.
  • Samwer K; Ames Laboratory, U.S. Department of Energy , Ames , Iowa 50011 , United States.
J Phys Chem Lett ; 9(19): 5877-5883, 2018 Oct 04.
Article em En | MEDLINE | ID: mdl-30240226
ABSTRACT
In glassy materials, the Johari-Goldstein secondary (ß) 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 ß 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 ß 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 ß relaxation that could be helpful for understanding the low-temperature dynamics and properties of MGs.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article