Relaxation dynamics of glasses along a wide stability and temperature range

TítolRelaxation dynamics of glasses along a wide stability and temperature range
Tipus de publicacióJournal Article
Any de publicació2016
AutorsRodríguez-Tinoco, C, Ràfols-Ribé, J, González-Silveira, M, Rodriguez-Viejo, J
JournalScientific Reports
Volume6
Pàgines35607 -
Date Published10/2016
Resum

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.

URLhttp://dx.doi.org/10.1038/srep35607
DOI10.1038/srep35607
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