Mode coupling analysis of the dynamical structure factor in supercooled liquid Na0.5Li0.5PO3
| Autor: | B. Toudic, C. Ecolivet, R. Marchand, B. Rufflé, A. Le Sauze, S. Beaufils |
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| Rok vydání: | 1998 |
| Předmět: |
Condensed matter physics
Chemistry Dynamic structure factor Neutron scattering Condensed Matter Physics Spectral line Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Mode coupling Materials Chemistry Ceramics and Composites Relaxation (physics) Wavenumber Physical chemistry Structure factor Supercooling |
| Zdroj: | Journal of Non-Crystalline Solids. :244-249 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/s0022-3093(98)00645-0 |
| Popis: | The dynamical structure factor of supercooled Na 0.5 Li 0.5 PO 3 ( T g =515 K, T m =749 K) has been obtained by time-of-flight neutron scattering between room temperature and 773 K, just above the melting temperature. The temperature and wave number dependences of the measured spectra in the whole supercooled liquid range are shown to be well described by the solutions of a schematic mode coupling theory model. In particular, the crossover between vibrational excitations and fast relaxation processes above the susceptibility minimum is reproduced by the calculated spectra. This analysis leads then to the identification of a crossover temperature around 620 K in this non-fragile glass-forming liquid. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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