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Comparison Between Volume and Enthalpy Relaxations in Non-crystalline Solids Based on the Fictive Relaxation Rate |
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| Authors: | Málek J. Mitsuhashi T. |
| Affiliation: | (1) Joint Laboratory of Solid State Chemistry, Academy of Sciences of the Czech Republic & University of Pardubice, Studentská 84, Pardubice, 532 10, Czech Republic;(2) National Institute for Research in Inorganic Materials, Science and Technology Agency of Japan, Namiki 1-1, Tsukuba, Ibaraki 305, Japan |
| Abstract: | The volume and enthalpy relaxation rate of inorganic glasses and organic polymeric materials subjected to temperature jump  T has been analyzed. It is shown that the relaxation behavior in isothermal conditions can be compared on the basis of the fictive relaxation rate defined as Rf=(dTf/dlogt)i. No significant difference between volume and enthalpy relaxation rate has been found for all materials examined. A simple equation relating the Rf and parameters of Tool-Naraynaswamy-Moynihan (TNM) phenomenological model has been derived. This equation predicts increasing Rf with the magnitude of temperature jump. It seems that correct determination of TNM parameters might be problematic for slowly relaxing polymers as the effect of these parameters becomes comparable with experimental uncertainty.This revised version was published online in November 2005 with corrections to the Cover Date. |
| Keywords: | enthalpy relaxation glasses polymers volumerelaxation |
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