Wang Li-Min
State Key Laboratory of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei, 066004 China.
J Phys Chem B. 2009 Apr 16;113(15):5168-71. doi: 10.1021/jp8110327.
Relaxation enthalpies in the vicinity of glass transitions were recorded on the basis of the heat capacity curves measured in nine glass-forming molecular liquids and solutions in the well defined cooling and subsequent heating cycles. It is observed that enthalpy hysteresis in the cooling/heating cycles is less significant in liquids with increasing fragility. A notable correlation of the fragility index m with relaxation enthalpy DeltaH(R), glass transition temperature, and heat capacity jump from glasses to liquids is demonstrated. The introduction of DeltaH(R) favors the thermodynamic evaluation of fragility in the glass forming multicomponent systems such as solutions and alloys.
基于在九个玻璃形成分子液体和溶液中，在明确的冷却及随后的加热循环中测量得到的热容曲线，记录了玻璃化转变附近的弛豫焓。可以观察到，随着液体脆性增加，冷却/加热循环中的焓滞后现象变得不那么显著。脆性指数m与弛豫焓ΔH(R)、玻璃化转变温度以及从玻璃态到液态的热容跃变之间存在显著相关性。引入ΔH(R)有利于对诸如溶液和合金等玻璃形成多组分体系中的脆性进行热力学评估。
