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Maxwell relaxation time for nonexponential α‐relaxation phenomena in glassy systems
Author(s) -
Doss Karan,
Wilkinson Collin J.,
Yang Yongjian,
Lee KuoHao,
Huang Liping,
Mauro John C.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17051
Subject(s) - relaxation (psychology) , non equilibrium thermodynamics , statistical physics , stress relaxation , viscosity , cole–cole equation , thermodynamics , maxwell relations , shear viscosity , materials science , condensed matter physics , physics , quantum mechanics , electric field , psychology , social psychology , dielectric , creep , inhomogeneous electromagnetic wave equation , optical field
We examine the mean relaxation time predicted by the Maxwell relation for stress and structural α‐relaxation phenomena. We express this relation using the Markov network framework and present an expression for the average relaxation time under equilibrium and nonequilibrium conditions that is rooted in the energy landscape of a material. We show that structural relaxation times calculated using the Maxwell relation must systematically underpredict the relaxation time. Finally, we report experimental evidence suggesting that the relaxation time obtained from shear viscosity measurements must correspond to a stress relaxation time.