Relation between the activation energy of the Johari-Goldstein β relaxation and T g of glass formers
作者： K. Ngai , S. Capaccioli
DOI: 10.1103/PHYSREVE.69.031501
关键词: Relaxation (physics) 、 Enthalpy 、 Coupling (probability) 、 Beta (velocity) 、 Crystallography 、 Physics 、 Activation energy 、 Glass transition
摘要: For glass-forming substances, we show that the ratio ${E}_{\ensuremath{\beta}}{/RT}_{g}$ can be predicted quantitatively from coupling model. Here ${E}_{\ensuremath{\beta}}$ is glassy state activation enthalpy of Johari-Goldstein \ensuremath{\beta} relaxation, ${T}_{g}$ glass transition temperature \ensuremath{\alpha} and R gas constant. The calculated value in good agreement with experimental many formers. results locate origin this cross correlation between relaxation although there are some notable exceptions to correlation.
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