Figure 3.

(a) Calculated and experimental diffusion coefficients of AIST. The theoretical coefficients are obtained by evaluating the atomic mean square displacements in the amorphous models without crystalline boundaries, on an 80 ps time scale. Experimental values of D at T below 600 K are obtained from the measured growth velocities v_g²⁰ by assuming that v_g can be described by the WF equation (1) and by using Thompson-Spaepen formula³⁴ to estimate Δμ(T). The high-T diffusivity values refer to liquid Sb₄Te and are taken from Ref. 24. The inset shows the theoretical values of v_g for AIST, which we compute from the evolution of the number of crystalline-like particles. (c) Experimental values of E_a and D₀ for diffusion processes in selected crystals, glasses and supercooled liquid metals (taken from Refs. ³⁵ and ³⁶), compared with the experimental²⁰ and DFT values for AIST.