玻璃形成剂中普遍α-和Johari-Goldstein β-弛豫的统一分子水平机理
A unified molecular level mechanism for the universal alpha- and Johari-Goldstein beta-relaxations in glassformers
摘要：
我们提出了在一个分子弦中n个耦合分子的弛豫表现出n个独立的弛豫模式（RM），根据弦模型，每个模式都具有确定的弛豫时间和弛豫幅度。在高温下表现为单一弛豫的n个RM在低温下演化为两个弛豫物种，对于各自的弛豫时间和幅度具有不同的温度依赖性。由于这两个弛豫物种的特征与玻璃动力学中普遍存在的α-和Johari-Goldstein（JG）β-弛豫所表现出的特征一致，因此我们为这两个过程提供了统一的分子水平机制。
英文摘要：
We presented that the relaxation of n coupling molecules in a molecular string exhibits n individual relaxation modes (RMs), each mode being characterized by a definite relaxation time and amplitude according to the string model. The n RMs behaving a single relaxation at high temperature, evolves to two relaxation species, at low temperature, with different temperature dependences for the respective relaxation times and amplitudes. Since the characteristics of the two relaxation species are in agreement with those exhibited by the universal alpha- and Johari-Goldstein (JG) beta-relaxations in glass dynamics, we provided a unified molecular level mechanism for these two processes.
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