Abstract
By employing quasielastic neutron scattering, we studied the atomic-scale relaxation dynamics and transport mechanism of and metallic glass melts in the temperature range of above their liquidus temperatures. The results show that both liquids exhibit stretched exponential relaxation and Arrhenius-type temperature dependence of the effective diffusion coefficient. The melt exhibits an activation energy of 0.545 ± 0.008 eV and a stretching exponent ∼0.77 to 0.86 in the studied temperature range; no change of activation energy, as suggested in previous reports, associated with liquid-liquid phase transition was observed. In contrast, the melt exhibits larger diffusivity with a much smaller activation energy of and a smaller stretching exponent ∼0.51 to 0.60, suggestive of more heterogeneous dynamics.
- Received 26 January 2021
- Revised 2 May 2021
- Accepted 14 June 2021
DOI:https://doi.org/10.1103/PhysRevB.103.224104
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