Details

Autor(en) / Beteiligte

• Wang, Yi-Zhen
• Li, Ying
• Zhang, Jin-Xiu

Titel

Scaling of the hysteresis in the glass transition of glycerol with the temperature scanning rate

Ist Teil von

• The Journal of chemical physics, 2011-03, Vol.134 (11), p.114510-114510-5

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2011

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• By measuring the dependences of the temperature-dependent primary ("alpha") dielectric relaxation time behavior on the temperature scanning rate for the glass-forming glycerol, we study the scaling of hysteresis at the glass transition in glycerol. Based on the Vogel-Fulcher-Tammann (VFT) expression and the Angell's fragility concept, notable correlations of the systematic kinetic fragility, and of the hysteresis effect in the vitrification/fusion "alpha"-relaxation process of glycerol, with the temperature scanning rate, were reasonably analyzed and discussed. It was observed that the kinetic fragility m and the apparent glass-transition temperature hysteresis width $\Delta T_g^a$ Δ T g a , respectively, scaled the temperature scanning rate q as m ≈ α m q −γ and $\Delta T_g^a$ Δ T g a ≈ A 0 + αq β , at which the exponents, γ and β , were suggested to be characteristic of the resistance to the structure change or fragility change of the system during the glass transition. The observed scaling laws are quite similar to the scaling power law for the thermal hysteresis in the first-order phase transition (FOPT) of solids, providing a significant insight into the hysteresis effect in the glass transition of the glass-forming liquids.