Figure 1: Dynamic and relaxation anomalies in Ge–Se glass-forming melts.

At low Ge content, the structure of Ge–Se liquids is made of a Se chains with few GeSe_4/2 tetrahedral crosslinks (MD snapshots of Ge₁₀Se₉₀), (a) whereas the structure of the stoichiometric GeSe₂ (b) is made of a network of connected tetrahedra. (c) Calculated Ge and Se diffusion constants D at 1,050 K as a function of Ge content. The inset shows the calculated jump probability that a Ge/Se atom has jumped by a distance r>2.88 Å during t=20 ps. (d) Calculated Stokes–Einstein liquid viscosities η and Kohlrausch fitted relaxation time τ_α of the calculated intermediate scattering function F_s(k,t) (right axis) at 1,050 K as a function of Ge content. The open symbols (τ_α) refer to the particular value F_s(k,τ_α)=1/e. Error bars are in most of the cases of the size of the symbols but some are visible.