1. On Structural Rearrangements Near the Glass Transition Temperature in Amorphous Silica
- Author
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Robert Tournier, Michael I. Ojovan, Imperial College London, Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Université Toulouse III - Paul Sabatier (UT3) more...
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Technology ,Materials science ,amorphous silica ,02 engineering and technology ,01 natural sciences ,Condensed Matter::Disordered Systems and Neural Networks ,09 Engineering ,Article ,[SPI]Engineering Sciences [physics] ,percolation ,Percolation theory ,Phase (matter) ,0103 physical sciences ,[CHIM]Chemical Sciences ,General Materials Science ,glass transition ,structure ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,chemical bond ,010306 general physics ,Superconductivity ,[PHYS]Physics [physics] ,Microscopy ,QC120-168.85 ,Hausdorff–Besicovitch dimension ,Hausdorff-Besicovitch dimension ,QH201-278.5 ,Percolation threshold ,021001 nanoscience & nanotechnology ,Engineering (General). Civil engineering (General) ,TK1-9971 ,Condensed Matter::Soft Condensed Matter ,Ferromagnetism ,Chemical bond ,Descriptive and experimental mechanics ,Chemical physics ,Percolation ,Electrical engineering. Electronics. Nuclear engineering ,TA1-2040 ,0210 nano-technology ,Glass transition ,03 Chemical Sciences - Abstract
The formation of clusters was analyzed in a topologically disordered network of bonds of amorphous silica (SiO2) based on the Angell model of broken bonds termed configurons. It was shown that a fractal-dimensional configuron phase was formed in the amorphous silica above the glass transition temperature Tg. The glass transition was described in terms of the concepts of configuron percolation theory (CPT) using the Kantor-Webman theorem, which states that the rigidity threshold of an elastic percolating network is identical to the percolation threshold. The account of configuron phase formation above Tg showed that (i) the glass transition was similar in nature to the second-order phase transformations within the Ehrenfest classification and that (ii) although being reversible, it occurred differently when heating through the glass–liquid transition to that when cooling down in the liquid phase via vitrification. In contrast to typical second-order transformations, such as the formation of ferromagnetic or superconducting phases when the more ordered phase is located below the transition threshold, the configuron phase was located above it. more...
- Published
- 2021
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