Time-resolved phonons as a microscopic probe for demixing processes
| Autor: | A. Hoser, Götz Eckold, D Caspary, P Elter, Friedrich Güthoff, W Schmidt |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Spinodal
Materials science Condensed matter physics Phonon Scattering Neutron diffraction Nucleation 02 engineering and technology Inelastic scattering 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Inelastic neutron scattering 0104 chemical sciences Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Chemical physics Physics::Atomic and Molecular Clusters Neutron Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Physica B: Condensed Matter. 350:83-86 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2004.04.058 |
| Popis: | Time-resolved inelastic neutron scattering from acoustic phonons has been used to characterise the mechanism of demixing in ionic crystals of the silver–alkali halide type. Stroboscopic techniques allow to study the time-evolution of phonon spectra during the phase separation in AgBr–NaBr and AgCl–NaCl single crystals on a time scale of seconds. These data provide the most direct information about changes of interatomic interactions. Characteristic differences are observed for ageing temperatures above and below the spinodal temperature which allow to distinguish between different mechanisms based on nucleation on the one hand and concentration fluctuations on the other. |
| Databáze: | OpenAIRE |
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