目前，揭示玻璃熔体冷却过程中强弱转变现象的结构起源和机理，被认为是破解“玻璃本质和玻璃形成”这一凝聚态物理科学领域重要问题的关键，持续地成为国内外的研究热点。项目组最近发现：拥有宽广玻璃形成区的CaO-Al2O3熔体具有强弱转变特征。结合课题组该方向的初步研究结果，本项目拟以铝酸盐玻璃熔体为研究对象，利用气动悬浮无坩埚激光加热装置在深过冷液体粘度等物性评测和原位结构表征方面的优势（如：因冷却技术限制目前无法淬冷玻璃化的氧化铝可实现熔点以下500K过冷度），结合不同假想温度玻璃的制备工艺探索及结构和物性表征，弄清玻璃熔体强弱转变过程的结构演化特征；在此基础上，利用铝酸盐熔体宽范围玻璃形成区优势，探索化学组成和温度变化引起的熔体和玻璃结构、热物性参数的演化规律，并基于“温度依赖拓扑限制”等理论方法，定量计算和预测玻璃粘温动力学特性的组成和结构依赖，进而阐明强弱转变机理。

Fragile-to-strong transition phenomenon, which appears during the cooling of glass-forming liquids, has consistently been one of the hot points under investigation in the field of condensed matter physics. Considering our recent discovery about the FST phenomenon in C3A glass among the CaO- Al2O3 glass system, this project will focus on the aluminum-bearing glassy system to conduct the research on fragile-to-strong transition phenomenon. Relying on the advantages of the novel contactless aerodynamic laser heated levitation setup, which can realize the in-situ observation and characterization of deep super-cooled liquids (for example, deep super-cooled liquid state down to 500K below its melting point for the extremely poor glass former Al2O3 can be realized), combined with the structural characterization of series of glass samples with different fictive temperatures, we will elucidate the structural evolution during Fragile-to-strong transition. In addition, using the feature of aluminum-bearing glasses with wide compositional glass-forming scope, combined with the structural and compositional dependence of series of glasses and Temperature-dependent constraint theory, we will investigate the temperature and composition dependence of viscosity and other thermo-physical attributes and elucidate the mechanism of fragile-to-strong transition.