Structural changes in loosening amorphous packings of Lennard-Jones atoms

Computer simulations of crystalline and amorphous Lennard-Jones systems hav e revealed a stability threshold at reduced density 0.8-0.85. At this densi ty, a substance undergoes a phase transition losing homogeneity and at lowe r densities decomposes into regions of dense atomic clusters separated by e mpty space. The characteristic size of atomic clusters is approximately 10 atomic diameters. They are united by "bridges" of close-packed atoms into a single percolation cluster. The voids from branched channels with diameter s considerably exceeding an atomic diameter and permeating the entire space of the model.