Maxwell relaxation time for nonexponential α‐relaxation phenomena in glassy systems
Karan Doss, Collin J. Wilkinson, Yongjian Yang, Kuo‐Hao Lee, Liping Huang, John C. Mauro
Abstract
Abstract 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.
Topics & Concepts
Relaxation (psychology)Non-equilibrium thermodynamicsStatistical physicsStress relaxationViscosityCole–Cole equationThermodynamicsMaxwell relationsShear viscosityMaterials scienceCondensed matter physicsPhysicsQuantum mechanicsElectric fieldOptical fieldInhomogeneous electromagnetic wave equationSocial psychologyCreepDielectricPsychologyMaterial Dynamics and PropertiesTheoretical and Computational PhysicsGlass properties and applications