Experimental nonevidence of fragile-to-strong crossover

This study explores the viscosity behavior of the Ge-Se chalcogenide glass-forming system. Four compositions containing 5, 10, 15, and 20 at. % germanium were examined. Viscosity measurements were performed over a broad range, spanning approximately 13 orders of magnitude, by combining the pressure-assisted melt filling technique with penetration and parallel-plate viscometry. The results demonstrate that no fragile-to-strong crossover occurs in any of the studied compositions.本研究探究了Ge-Se硫系玻璃形成体系的黏滞行为。实验选取了锗原子百分比（at. %）分别为5%、10%、15%与20%的四种组分进行考察。通过联合压力辅助熔体填充技术（pressure-assisted melt filling technique）、渗透黏度法（penetration viscometry）与平行板黏度法（parallel-plate viscometry），本研究在跨越约13个数量级的宽泛范围内开展了黏度测量。结果表明，所有被研究的组分均未出现弱态-强态转变（fragile-to-strong crossover）现象。