Characterization of the secondary relaxations in glass-forming liquids. The contribution of the Starkweather line and of the Coupling Model to the rationalization of TSDC results
Source abstract
Abstract
Abstract This work addresses the study by thermostimulated depolarization currents (TSDC) of Johari-Goldstein (JG) β-relaxations in glass forming systems. Here we analyze the differences between the β-relaxation and the fast secondary (γ, δ, e, …) relaxations on the one hand, and the α-relaxation on the other. It is shown that TSDC is able to characterize JG although this mobility is often close to, or even partially overlapped with, the α-relaxation. It is also shown that the Starkweather line or zero entropy line (ZEL) can be used as a reference element to identify the secondary relaxations: non-compliance with the ZEL is an indicator of cooperativity. We finally showed that the non-cooperativeness of the Johari-Goldstein relaxation is highlighted by the joint consideration of the Coupling Model and the Starkweather line.
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Research context
OpenAlex topics: Material Dynamics and Properties · Thermodynamic properties of mixtures · Spectroscopy and Quantum Chemical Studies
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References (100+)
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