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Using the Car-Parrinello technique, ab initio molecular dynamics simulationsare performed for liquid NaSn alloys in five different compositions (20, 40,50, 57 and 80 % sodium). The obtained structure factors agree well with thedata from neutron scattering experiments. The measured prepeak in the structurefactor is reproduced qualitatively for most compositions. The calculated andmeasured positions of all peaks show the same trend as function of thecomposition.\\ The dynamic simulations also yield information about theformation and stability of Sn$_4$ clusters (Zintl anions) in the liquid. In oursimulations of compositions with 50 and 57 % sodium we observe the formation ofnetworks of tin atoms. Thus, isolated tin clusters are not stable in suchliquids. For the composition with 20 % tin only isolated atoms or dimers of tinappear, ``octet compounds'' of one Sn atom surrounded by 4 Na atoms are notobserved.Comment: 12 pages, Latex, 3 Figures on reques

Ab initio simulations of liquid NaSn alloys: Zintl anions and network formation