Anomalous Enthalpy Relaxation in Vitreous Silica
نویسندگان
چکیده
منابع مشابه
Anomalous Enthalpy Relaxation in Vitreous Silica
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 extremely high sensitivity of the Tg to the hydroxyl content, but also from decrease of the Tg with repeating the calorimetric scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercoo...
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Alisha N. Clark,1,* Charles E. Lesher,1,2 Steven D. Jacobsen,3 and Sabyasachi Sen4 1Department of Earth and Planetary Sciences, University of California, Davis, California 95616, USA 2Department of Geoscience, Aarhus University, DK-8000 Aarhus C, Denmark 3Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, USA 4Department of Materials Science, Universi...
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The authors studied the anomalous behaviors of vitreous silica under the combined influence of high temperature and pressure, by using molecular dynamics simulations based on a charge-transfer three-body potential. Accordingly, anomalous properties, such as the minimum in the bulk modulus at 2–3 GPa and the negative thermal expansion while under pressure, are inherently connected to the ability...
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ژورنال
عنوان ژورنال: Frontiers in Materials
سال: 2015
ISSN: 2296-8016
DOI: 10.3389/fmats.2015.00054