The shear viscosity of the well-known binary Lennard-Jones mixture is
simulated under constant temperature and constant volume conditions
(NVT) by a molecular-dynamics (MD) method. The effect of atomic size mismatch on the
fragility parameter and glass-forming ability is studied. The fragility parameters calculated
from shear viscosity data decrease with the increment of the atomic size mismatch. The
value of the fragility changes from 168.963 to 22.976 when the mismatch changes
from 0.023 to 0.25. It is shown that the fragility parameter is sensitive to the
atomic size mismatch. The calculated pair distribution functions and mean square
displacements indicate that the glass-forming ability increases with the atomic size
mismatch.
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