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      Universal behavior of the apparent fragility in ultraslow glass forming systems

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          Abstract

          Despite decades of studies on the grand problem of the glass transition the question of well-defined universal patterns, including the key problem of the previtreous behavior of the primary (structural) relaxation time, remains elusive. This report shows the universal previtreous behavior of the apparent fragility, i.e. the steepness index m P ( T >  T g ) =  d log 10 τ( T)/ d(  T g / T). It is evidenced that m P ( T) = 1( T −  T*), for T →  T g and   T*=  T g  − Δ  T*. Basing on this finding, the new 3-parameter dependence for portraying the previtreous behavior of the primary relaxation time has been derived: τ( T) =  C Ω(( T −  T*)/ T) −Ω × [ exp(( T −  T*)/ T)] Ω. The universality of obtained relations is evidenced for glass formers belonging to low molecular weight liquids, polymers (melt and solid), plastic crystals, liquid crystals, resins and relaxors. They exhibit clear preferences either for the VFT or for the critical-like descriptions, if recalled already used modeling. The novel relation can obey even above the dynamic crossover temperature, with the power exponent Ω ranging between ~17 (liquid crystals) to ~57 (glycerol), what may indicate the impact of symmetry on the previtreous effect. Finally, the emerging similarity to the behavior in the isotropic phase of nematic liquid crystals is recalled.

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          Most cited references 55

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          On the Temperature Dependence of Cooperative Relaxation Properties in Glass‐Forming Liquids

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            ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

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              Nonexponential relaxations in strong and fragile glass formers

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                Author and article information

                Contributors
                marllena.malwinka@gmail.com
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                2 May 2019
                2 May 2019
                2019
                : 9
                Affiliations
                ISNI 0000 0004 0497 7361, GRID grid.425122.2, Institute of High Pressure Physics Polish Academy of Sciences, ; ul. Sokołowska 29/37, 01-142 Warsaw, Poland
                Article
                42927
                10.1038/s41598-019-42927-y
                6497650
                31048717
                © The Author(s) 2019

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                Funding
                Funded by: FundRef https://doi.org/10.13039/501100004281, Narodowe Centrum Nauki (National Science Centre);
                Award ID: 2016/21/B/ST3/02203
                Award Recipient :
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                © The Author(s) 2019

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                phase transitions and critical phenomena

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