Vogel-Fulcher-Tammann plot for viscosity scaled with temperature interval between actual and ideal glass transitions for metallic glasses in liquid and supercooled liquid states

The glass transition temperature- (T_g-) scaled Arrhenius plot (Angell plot) has been modified by considering viscosity (η) of metallic glasses in a liquid and supercooled liquid state with absolute temperature (T). The logη-(T_g/T) relationships in Angell plot were modified as logη-[(T_g-T₀)/(T-T₀)] relationships where T₀ is the ideal glass transition temperature from Vogel-Fulcher-Tammann (VFT) parameters. Introducing ΔT_g-0 (≡T_g-T₀) makes it possible to regard the modified plot as ΔT_g-0-scaled VFT plot. Using B from VFT parameters provides a relationship D*_VFT = B/ΔT_g-0 ∼38, in which T_g was principally measured at a heating rate of 0.333 K s^-1. The analyses revealed that ΔT_g-0-scaled VFT plot reflects α relaxation due to a motion of groups of atoms, and that ΔT_g-0/(T_l-T₀) where T_l is the liquidus temperature can be a glass-forming parameter.