Chen Zeming, Li Zijing, Zhang Yaqi, Liu Riping, Tian Yongjun, Wang Li-Min
State Key Lab of Metastable Materials Science and Technology, and College of Materials Science and Engineering, Yanshan University, 066004, Hebei, China.
Eur Phys J E Soft Matter. 2014 Jun;37(6):7. doi: 10.1140/epje/i2014-14052-y. Epub 2014 Jun 26.
The calorimetric determination of the fragility m-index is compared using the T f and T g-onset methods for typical metallic and molecular glass forming systems of Pd39Ni10Cu30P21, glycerol, triacetin and propylene carbonate. The results are evaluated by referring to the standard m-values determined from the kinetic measurements of the viscosity or structural relaxation time in the supercooled liquid regimes. The m-indexes derived from the T f method are found to generally agree well with the kinetic measurements for all the systems. However, a large deviation is shown between the m-indexes calculated with the T g-onset method and the kinetic results for the fragile liquids of triacetin and propylene carbonate, indicating the calorimetric determination of the fragility m-indexes in terms of the T f method produces less uncertainty.
使用Tf和Tg起始方法，对典型的金属和分子玻璃形成体系Pd39Ni10Cu30P21、甘油、三醋精和碳酸丙烯酯的脆性m指数进行量热测定比较。通过参考在过冷液体区域中由粘度或结构弛豫时间的动力学测量确定的标准m值来评估结果。发现从Tf方法得出的m指数与所有体系的动力学测量结果总体上吻合良好。然而，用Tg起始方法计算的m指数与三醋精和碳酸丙烯酯的脆性液体的动力学结果之间存在很大偏差，这表明根据Tf方法对脆性m指数进行量热测定产生的不确定性较小。
