On the problem of observation of two-level tunneling states in supercooled liquids, glass-forming polymers, orientational glasses, and metallic glasses via configurational entropy
| Autor: | V. B. Kokshenev |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Materials science Amorphous metal Physics and Astronomy (miscellaneous) Configuration entropy General Physics and Astronomy Thermodynamics Observable Polymer Condensed Matter::Disordered Systems and Neural Networks Heat capacity Condensed Matter::Soft Condensed Matter Renormalization chemistry Plastic crystal Supercooling |
| Zdroj: | Low Temperature Physics. 35:282-285 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.3115806 |
| Popis: | From general perspectives, there is no conceptual gap between the structural and orientational glasses. Both kinds of glasses expose universal features during primary relaxation [Low Temp. Phys. 33, 617 (2007)]. However, in spite of much effort made to observe generic two-level systems (TLS) in polymers, organic liquids, and plastic crystals via thermodynamic measurements, no similarity unifying glass formers has been established. Re-analyzing a number of experimental studies, it is revealed that no renormalization conditions imposed on occupation numbers of structural units, relaxing to the glass state, were taken into consideration by the experimentalists. In this study, the effective-cluster approach is applied to configurational (excess liquid-over-solid) entropy measured in both supercooled liquids and crystals through the heat capacity. As the result, new relationships between the observable thermodynamic and dynamic characteristics are found for molecular liquids, polymers, and networks on the basi... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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