Visco-Elastic Relaxations in Fragile Glass Forming Systems

提出了用布里渊光散射、分子动力学计算机模拟和阻抗谱相结合的方法来研究脆性玻璃形成液体的粘弹性弛豫。研究的目的是提高对新型玻璃材料（如碲、重金属氟化物和磷酸盐）中决定玻璃形成能力和粘度对温度依赖性的因素的理解。本研究将主要探讨：(1)不同网络角色的作用。(2)反阳离子的稳定作用。(3)混合阴离子组成对网络结构的影响以及移动阳离子与网络的解耦关联度。(4)杂质的影响和可能的缺陷表征。＊＊＊

9315779 Kieffer The investigation of visco-elastic relaxations in fragile glass forming liquids, using a combination of Brillouin light scattering, molecular dynamic computer simulations and impedance spectroscopy is proposed. The objective of the research is to provide improved understanding with respect to the factors that determine the glass formation ability and the temperature dependence of the viscosity in novel glassy materials, e.g. tellurites, heavy metal fluorides and phosphates. The principal aspects of this study will be to explore: (1) The role of different network cations. (2) The stabilizing effect of counter cations. (3) The effect of mixed anion compositions on the network structure and the associated degree of decoupling between mobile cations and the network. (4) The influence of impurities and the possible characterization of defects. ***