Fast and slow dynamics in Pr60Ni10Cu20Al10 melts as seen by neutron scattering

We present experimental results on the fast β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60Ni10Cu20Al10 melts. The density correlation function, measured over a range of temperatures, shows a clear two-step relaxation process. The critical or...

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Veröffentlicht in:Journal of applied physics 2008-01, Vol.103 (1)
Hauptverfasser: Chathoth, S. M., Podlesnyak, A.
Format: Artikel
Sprache:eng
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Zusammenfassung:We present experimental results on the fast β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60Ni10Cu20Al10 melts. The density correlation function, measured over a range of temperatures, shows a clear two-step relaxation process. The critical or crossover temperature, Tc, evaluated from the asymptotic scaling function of the mode-coupling theory was found to be at 620±5 K. The correlation decay is not exponential, being extended over a far wider time range. In addition, the stretched exponent βq was found to be independent of temperature and momentum transfer (q). The self-diffusivity is an order lower compared with that observed in simple metallic liquids at their melting temperature.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2827486