超高压下的玻璃动力学
Glassy Dynamics Under Superhigh Pressure
摘要：
几乎所有的玻璃形成液体的特点，随着结构的α-弛豫过程，一个更快的二次过程（β-弛豫），其性质属于玻璃物理学的伟大奥秘。然而，对于这些液体中的一些，没有观察到明显的二次弛豫。一个突出的例子是典型的玻璃形成液体甘油。在目前的工作中，通过在高达6 GPa的超高压下进行介电谱，我们表明，在甘油中，在P > 3 GPa的介电损耗中出现了一个显着的二次弛豫峰。我们确定这种β-松弛是Johari-Goldstein型，并讨论了它与多余机翼的关系。我们提供了一个平稳的，但显着增加的玻璃化转变温度和脆性的压力增加的证据。
英文摘要：
Nearly all glass-forming liquids feature, along with the structural alpha-relaxation process, a faster secondary process (beta-relaxation), whose nature belongs to the great mysteries of glass physics. However, for some of these liquids, no well-pronounced secondary relaxation is observed. A prominent example is the archetypical glass-forming liquid glycerol. In the present work, by performing dielectric spectroscopy under superhigh pressures up to 6 GPa, we show that in glycerol a significant secondary relaxation peak appears in the dielectric loss at P > 3 GPa. We identify this beta-relaxation to be of Johari-Goldstein type and discuss its relation to the excess wing. We provide evidence for a smooth but significant increase of glass-transition temperature and fragility on increasing pressure.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
