Analysis and characterization of the transition from the Arrhenius to non-Arrhenius structural relaxation in fragile glass-forming liquids

作者：Ikeda Masahiro; Aniya Masaru

来源：Journal of Thermal Analysis and Calorimetry, 2018, 132(2): 835-842.

DOI：10.1007/s10973-018-6976-6

• Arrhenius crossover
• Cooperativity onset temperature
• Ideal glass-transition temperature

We have studied the transition from an Arrhenius-like to a non-Arrhenius-like structural relaxation behavior in fragile glass-forming liquids. This transition is denoted by the temperature T (A) that usually occurs above the melting point T (m) and the dynamic crossover temperature T (B). Recent studies reveal that T (A) is a characteristic temperature related with the dynamical properties of the system. However, its unambiguous determination is not easy. In this work, a method to obtain the temperature T (A) from the experimental data of alpha-relaxation time is presented. The obtained T (A) is compared with the cooperativity onset temperature T (x) extracted from the bond strength-coordination number fluctuation model. The result reveals that T (A) is close to T (x) for fragile liquids. From the result of the present analyses combined with the linear relation T (x) T (0), where T (0) is the Vogel temperature, the Arrhenius crossover phenomenon in fragile liquids is linked to the low-temperature structural relaxation dynamics.

• 出版日期2018-5