Evidence of a one-dimensional thermodynamic phase diagram for simple glass-formers

H. W. Hansen, A. Sanz, K. Adrjanowicz, B. Frick, K. Niss

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

Glass formers show motional processes over an extremely broad range of timescales, covering more than ten orders of magnitude, meaning that a full understanding of the glass transition needs to comprise this tremendous range in timescales. Here we report simultaneous dielectric and neutron spectroscopy investigations of three glass-forming liquids, probing in a single experiment the full range of dynamics. For two van der Waals liquids, we locate in the pressure–temperature phase diagram lines of identical dynamics of the molecules on both second and picosecond timescales. This confirms predictions of the isomorph theory and effectively reduces the phase diagram from two to one dimension. The implication is that dynamics on widely different timescales are governed by the same underlying mechanisms.
OriginalsprogEngelsk
Artikelnummer518
TidsskriftNature Communications
Vol/bind9
Udgave nummer1
ISSN2041-1723
DOI
StatusUdgivet - 2018

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