Surface tension and self-diffusion coefficient of liquid Si and Ge

Temperature-dependent surface tension γlv(T) and its temperature coefficient γ′lv(T)=dγlv(T)/dT for liquid silicon and germanium (l-Si and l-Ge) are thermodynamically modeled based on an established model for surface energy of crystals. Combining the relationship among γlv(T), self-diffusion coefficient D and liquid viscosity η, temperature dependent D(T) function is also modeled. The model predictions correspond to the available experimental results. It is found that γlv(T)∝T, γ′lv(T)∝T and D(T)∝T3/2 at a certain temperature range (including T