Viscosity of As2S3

This study presents a critical evaluation of experimental data on the heat capacity and viscosity of arsenic trisulfide and establishes a connection between these properties through excess entropy. As2S3 is a prototypical chalcogenide glass-former, renowned for its exceptional glass-forming ability and high glass stability. The work consolidates an extensive body of literature data on both the viscosity and heat capacity of this material, supplemented by accurate experimental viscosity measurements. The comprehensive analysis of these data enables the development of equations that characterize the viscosity over 14 orders of magnitude and describe heat capacity for crystal, glass, undercooled melt, and melt from 2 to 700 K. These representative equations for heat capacity enable the calculation of excess entropy, whose temperature dependence is subsequently linked to the temperature dependence of viscosity. Finally, the results are compared and correlated with prior findings for selenium and As2Se3, providing broader insights into the behavior of chalcogenide glass-formers.本研究针对三硫化二砷（arsenic trisulfide，As₂S₃）的热容与黏度实验数据开展批判性评估，并通过过剩熵（excess entropy）建立了两类物性间的内在关联。As₂S₃是典型的硫系玻璃形成体（chalcogenide glass-former），以其优异的玻璃形成能力与极高的玻璃稳定性闻名于世。本研究汇编了该材料黏度与热容领域的海量文献数据，并补充了精准的实验黏度测量结果。通过对上述数据的全面系统分析，本研究构建了可表征14个数量级跨度内黏度变化特征的经验方程，同时建立了可描述2~700 K范围内晶体、玻璃态、过冷熔体与熔体热容特性的通用方程。上述热容表征方程可用于过剩熵的计算，随后将过剩熵的温度依赖性与黏度的温度依赖性建立定量关联。最后，本研究将所得结果与硒（selenium）及三硒化二砷（As₂Se₃）的已有研究成果进行对比与关联，为深入理解硫系玻璃形成体的宏观行为特性提供了更全面的研究视角。