Ordering and structural properties of liquid Al-Ge alloys

A variational method based on thermodynamics of hard sphere system and pseudopotential perturbation scheme is used to determine the properties of mixing of liquid Al-Ge alloys as a function of composition. Entropy of mixing and concentration fluctuations are then obtained for hard sphere systems which are compared with the results of the quasilattice theory. The nature of atomic order in the liquid is discussed from the results of the concentration fluctuations in the long wavelength limit and from the chemical short range order.