anomalous enthalpy relaxation in vitreous silica

النقرات: 273
المعرّف: 184918
2015
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Ranked #43 of 68 articles by views in International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases

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الملخص
It is a challenge to calorimetrically determine the glass transition temperature (Tg) of vitreous silica. Here we demonstrate that this challenge mainly arises from the extreme sensitivity of the Tg to the hydroxyl content in vitreous silica, but also from the irreversibility of its glass transition when repeating the calorimetric scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercooled liquid at its Tg during cooling) has impact on enthalpy relaxation in glass. Here we find that vitreous silica (as a strong system) exhibits striking anomalies in both glass transition and enthalpy relaxation compared to fragile oxide systems. The anomalous enthalpy relaxation of vitreous silica is discovered by performing the hperquenching-annealing-calorimetry experiments. We argue that the strong systems like vitreous silica and vitreous Germania relax in a structurally cooperative manner, whereas the fragile ones do in a structurally independent fashion. We discuss the origin of the anomalous enthalpy relaxation in the HQ vitreous silica.
المفتاح المرجعي
eyue2015frontiersanomalous استخدم هذا المفتاح للاستشهاد التلقائي في المخطوطة أثناء استخدام مدير المخطوطات أو مدير الأطروحات من SciMatic
المؤلفون ;Yuanzheng eYue
مجلة International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases
السنة 2015
DOI
10.3389/fmats.2015.00054
URL
http://journal.frontiersin.org/Journal/10.3389/fmats.2015.00054/full
الكلمات المفتاحية
glass transition temperature annealing

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