SPECIFIC FEATURES OF THE LIQUID SILICON STRUCTURE STUDIED BY THE METHODS OF STATISTICAL GEOMETRY

The molecular-dynamics model of liquid silicon constructed by us earli er for 512 particles at the density 2515 kg/m(3) and the temperature 1 728 K has been studied by the Voronoi-Dirichlet method. The average va lues and the statistical distributions of the main parameters of the V oronoi polyhedra for the system are obtained. It is suggested to use a s the most informative parameters the distributions of the volumes and the nonsphericity coefficients of the thus obtained polyhedra. The sh ort-range order in the melt has been studied by the method of rejectin g the faces of small areas. The additional arguments in favor of a two -state model of the melt associated with the presence in the melt of l oose clusters (mainly with covalent bonding are discussed).