Investigation of the particular features of the structure factor of liquid Al-based alloys

► Two specific features of structure factor of liquid Al-based alloys: the shoulder on the second peak and the prepeak. ► The shoulder on the second peak is associated with a polytetrahedral order. ► The prepeak is caused by the chemical short-range order. ► Simulation of the chemical short-range order on a model of monatomic liquid. ► A new length scale responsible for the prepeak.