期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 355, 期 10-12, 页码 686-693出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2009.01.035
关键词
Glass transition; Thermodynamics; Fragility; Structural relaxation
In this paper we present a short survey on the concept of effective temperature, on its onset as a glass former vitrifies, on the various definitions in literature and their limits of applicability. An exactly solvable model glass is employed to compare effective temperatures among them and to set a criterion for the occurrence of an universal extra temperature in the framework of a 'two-temperature thermodynamics' for off-equilibrium aging systems. It will be shown that aging in glass formers is not a sufficient requirement. As an instance, memory effects typical of glasses are not compatible with a unique effective temperature. Yet, a reduced range of applicability can still be established and investigated. (C) 2009 Elsevier B.V. All rights reserved.
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