التفاصيل البيبلوغرافية
| العنوان: |
Fast and slow dynamics in Pr60Ni10Cu20Al10 melts as seen by neutron scattering. |
| المؤلفون: |
Chathoth, S. M., Podlesnyak, A. |
| المصدر: |
Journal of Applied Physics; Jan2008, Vol. 103 Issue 1, p013509, 4p, 3 Graphs |
| مصطلحات موضوعية: |
NEUTRON scattering, PRASEODYMIUM, LIQUID alloys, RELAXATION (Nuclear physics), THERMAL diffusivity |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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