期刊
JOURNAL OF CHEMICAL PHYSICS
卷 132, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3306562
关键词
diffusion; glass; liquid theory; molecular dynamics method; relaxation theory
The range of activation barrier heights for the Johari-Goldstein (JG) relaxation in glasses is shown to overlap the range for the main (alpha) relaxation, but to be on the average somewhat lower. This suggests the JG relaxation, like the alpha, involve transitions between megabasins in the energy landscape, and that the original conjecture by Johari and this author that the JG relaxation is an intrabasin one cannot be correct. A further possibility is that there is a closer connection of the JG relaxation to the phenomenon of dynamic heterogeneity in supercooled liquids than so far assumed.
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