Abstract
We present experimental results on the fast Β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60 Ni10 Cu20 Al10 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.
| Original language | English |
|---|---|
| Article number | 013509 |
| Journal | Journal of Applied Physics |
| Volume | 103 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2008 |
Funding
The authors thank Professor Andreas Meyer for his support and the Paul Scherrer Institute for the beam time. S.M.C. gratefully acknowledges the financial support of the priority program 1120 phase transition in multicomponent metallic melts of Deutsche Forchungegemeinschaft (DFG) and from BMBF.