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Structural Relaxation Rate and Aging in Amorphous Solids
Authors: Málek Jiří
Year: 2023
Type of publication: článek v odborném periodiku
Name of source: Journal of Physical Chemistry C
Publisher name: American Chemical Society
Place: Washington
Page from-to: 6080-6087
Titles:
Language Name Abstract Keywords
cze Rychlost strukturní relaxace a stárnutí v amorfních pevných látkách Obsáhlá páce se zabývá porovnáním relaxačního chování amorfních pevných látek na základě parametru izotermní relaxační rychlosti při podchlazení 10 K pod teplotou skelného přechopu. Práce porovnává relaxační chování různých skupin materiálů jako jsou organické polymery, epoxidové pryskyřice, cukry, hydratované škroby, oxidová skla, chalkogenidová skla, halidová skla, kovová skla, vulkanická skla a tektity. strukturní relaxace; amorfní materiály; dynamika; entalpická relaxace; objemová relaxace
eng Structural Relaxation Rate and Aging in Amorphous Solids The structural relaxation in amorphous materials is discussed within the Tool-Narayanaswamy-Moynihan model (TNM), the Kovacs-Aklonis- Hutchinson-Ramos model (KAHR), and the entropy-based Adam-Gibbs- Scherer-Hodge model (AGSH). These three phenomenological models are most frequently used for the description of experimental structural relaxation data by a suitable set of parameters obtained by curve fitting. The parameter sets reported in the literature for 250 different amorphous material compositions are analyzed on the basis of the isothermal relaxation rate R depending on the nonexponentiality parameter fi and the nonlinearity contribution, defined for the TNM, KAHR, and AGSH models as a = -(dln z/dTf)i. The R10 calculated at 10 K below Tg represents a scale for the structural relaxation rate. It describes the structural relaxation kinetics in very different amorphous materials such as organic polymers, epoxy resins, sugars, hydrated starch, simple organic molecules, oxide glasses, chalcogenide glasses, halide glasses, metallic glasses, volcanic glasses, and tektite. This approach can be used for the kinetic comparison of structural relaxation behavior in different amorphous materials as well as in the assessment of the aging treatment and composition design for their future applications. adam-gibbs formulation; enthalpy relaxation; glass-transition; volume relaxation; prior history; temperature-dependence; heat-capacity; recovery; polymers; dynamics

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