Fig. 3: Temperature evolution of the dynamical parameters and of the structure on the medium-range order (MRO) length scale.
From: Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids
a Glass transition temperature-scaled (for a cooling rate of 1.5 K min−1) fragility plot of the mean relaxation time <τ(QFSDP) > for Pt42.5Cu27Ni9.5P21 and Pd42.5Cu27Ni9.5P21 (black squares and red circles, respectively). Solid lines are linear fits on the logarithmic scale underlining the similar kinetic fragility of the two liquids. Note that the slope provided in the figure comes from the conventional definition of the kinetic fragility, m, where the axes are inverted. b Corresponding Kohlrausch-Williams-Watts exponent β(QFSDP,T) as a function of mean relaxation time <τ(QFSDP) > . The dashed lines are linear fits of the data on the logarithmic scale. c Evolution of normalized volume dilation of the fourth and third atomic shell from the reduced pair distribution functionV4-3(T)/V4-3(Tg) as a function of normalized inverse temperature Tg/T, where Tg is the glass transition temperature during heating with a rate of 0.33 K s−1. A linear fit (full line in respective color) of the data is used to calculate the structural fragility parameter mstr4-3 of the liquid phase. Error bars indicate the standard error due to fitting of the experimental data using the Levenberg Marquardt algorithm.
