Relaxation dynamics of glasses along a wide stability and temperature range
Rodríguez Tinoco, Cristian (Universitat Autònoma de Barcelona. Departament de Física)
Ràfols-Ribé, Joan (Universitat Autònoma de Barcelona. Departament de Física)
González Silveira, Marta (Universitat Autònoma de Barcelona. Departament de Física)
Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2016
Abstract:	While lots of measurements describe the relaxation dynamics of the liquid state, experimental data of the glass dynamics at high temperatures are much scarcer. We use ultrafast scanning calorimetry to expand the timescales of the glass to much shorter values than previously achieved. Our data show that the relaxation time of glasses follows a super-Arrhenius behaviour in the high-Temperature regime above the conventional devitrification temperature heating at 10 K/min. The liquid and glass states can be described by a common VFT-like expression that solely depends on temperature and limiting fictive temperature. We apply this common description to nearly-isotropic glasses of indomethacin, toluene and to recent data on metallic glasses. We also show that the dynamics of indomethacin glasses obey density scaling laws originally derived for the liquid. This work provides a strong connection between the dynamics of the equilibrium supercooled liquid and non-equilibrium glassy states.
Grants:	Ministerio de Economía y Competitividad MAT2013-40986-P Ministerio de Economía y Competitividad MAT2014-57866-REDT
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Glasses ; Scaling laws ; Thermodynamics
Published in:	Scientific reports, Vol. 6 (October 2016) , art. 35607, ISSN 2045-2322

DOI: 10.1038/srep35607
PMID: 27767071

8 p, 597.8 KB

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