منابع مشابه
Modeling vitreous silica bilayers
Theoretical modeling is presented for a freestanding vitreous silica bilayer which has recently been synthesized and characterized experimentally in landmark work. While such two-dimensional continuous random covalent networks should likely occur on energetic grounds, no synthetic pathway had been discovered previously. Here the bilayer is modeled using a computer assembly procedure initiated f...
متن کاملMechanisms of anomalous compressibility of vitreous silica
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...
متن کاملMolecular Dynamics Simulation of Vitreous Silica Structures
Molecular dynamics (MD) simulations can be used to gain insights into the atomic level structure of glasses not easily accessible to experiment. However, to reliably obtain accurate results it is essential to chose the proper force fields (FF), the proper length of the simulation cell, and the proper cooling cycle to generate the 300K structure from the melt. Herein we establish guidelines for ...
متن کاملThe high-temperature transformation of andalusite (A12SiOs) into 3/2-mullite (3A12Oa2SiO2) and vitreous silica (SiO2)
S U M M A R Y . The high-temperature transformation of andalusite (AI2SiOs) into 3/2-mullite (3AIzO32SiO2) plus vitreous silica (SiO2) has been studied within the temperature interval from 13oo to 16oo ~ by means of X-ray powder and single-crystal techniques and by infrared spectroscopy. Results are interpreted in terms of a topotactic transformation in which (oi I) and (oI i) planes of andalus...
متن کاملAnomalous 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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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1958
ISSN: 0001-4966
DOI: 10.1121/1.1929949