通过传统量热和超快量热相结合研究As_(2)S_(3)玻璃形成液体的动力学行为

The Dynamic Behavior of As_(2)S_(3) Glass-Forming Liquid Jointly Determined by Conventional and Ultrafast Calorimetry

玻璃形成液体动力学行为的研究对理解玻璃形成、玻璃转变和玻璃性能至关重要。通过整合传统量热、超快量热与温度调制方法的不同时间尺度特征和测量优势,系统地研究了As_(2)S_(3)玻璃在相对宽的深过冷温度区内的等效粘度-温度依赖关系,验证了该等效粘度-温度数据与真实粘度-温度数据的一致性,并通过相同参数的MYEGA方程对全温区粘度-温度关系和等效粘度-温度关系进行拟合。结果得到As_(2)S_(3)玻璃的液体动力学脆度为39,该数值略大于在玻璃转变温度附近相对窄温区的脆度拟合值。上述研究不仅证明了量热方法测量玻璃形成液体等效粘度的可行性,而且为测量玻璃形成液体在更宽深过冷区域的液体动力学行为提供新的方法和参考,更为研究异常的脆-强转变行为提供新思路。

The investigation of dynamic behaviors in glass-forming liquids is essential for comprehending glass formation,glass transition,and glass properties.In this work,the temperature dependence of equivalent viscosity in As_(2)S_(3) glass across a broad range of deep undercooling temperatures was systematically investigated by integrating the distinct timescales and measurement advantages of conventional calorimetry and ultrafast calorimetry with temperature modulation techniques.The alignment between the equivalent viscosity-temperature data and the actual viscosity-temperature data was verified,and the relationships between viscosity or equivalent viscosity and temperature across the entire temperature range were accurately modeled using the MYEGA equation with consistent parameters.The liquid dynamic fragility of As_(2)S_(3) glass was determined to be 39,slightly exceeding the fitted fragility value within the relatively narrow temperature band close to the glass transition temperature.This research not only illustrates the viability of using calorimetry to gauge equivalent viscosity in glass-forming liquids but also presents a fresh approach and benchmark for evaluating the liquid dynamic behaviors of such liquids across wider and deeper supercooled zones,offering novel perspectives on exploring anomalous fragility-strong transition phenomena.